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transbrake=wheelstand "UPDATE" #1379303 01/31/13 10:00 AM 01/31/13 10:00 AM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	I have another post for "what will it run", but I figured I would start another to keep it separate. I installed my 418 into my dad's 85 Shelby Charger and now installed the transbrake. The car is a full tube car with ladder bars and non adjustable shocks. I was launching at 3000 rpm on the 2 step and the car wanted to stand up every pass. It seems to be dead hooking. What do you guys to to calm down the launch? More tire pressure,different launch rpm? Last edited by 416challenger; 02/16/13 01:31 AM.

Re: transbrake=wheelstand [Re: 416challenger] #1379304 01/31/13 10:24 AM 01/31/13 10:24 AM
Joined: Jun 2010 Posts: 3,112 LONG ISLAND fishy340 master
fishy340 master Joined: Jun 2010 Posts: 3,112 LONG ISLAND	Both 1 at a time so you know what one worked.If its radials it is totally different.

Re: transbrake=wheelstand [Re: fishy340] #1379305 01/31/13 10:42 AM 01/31/13 10:42 AM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart master
408strokerdart master 4 Joined: Feb 2003 Posts: 3,456 Out West	What trans? What is the gearing combo? Maybe you will need to lower the ladder bars one hole? Any video of the passes?

Re: transbrake=wheelstand [Re: 408strokerdart] #1379306 01/31/13 12:04 PM 01/31/13 12:04 PM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	Trans is a 727 with standard gear set, 4.30 rear gear and 29.5 x 11.5W tire. I have a video from a cell phone that is not very good, but I will see if I can post it. Last edited by 416challenger; 01/31/13 12:05 PM.

Re: transbrake=wheelstand [Re: 416challenger] #1379307 01/31/13 02:01 PM 01/31/13 02:01 PM
Joined: Jan 2003 Posts: 684 St. Charles, MO. S Slingshot383 mopar
Slingshot383 mopar S Joined: Jan 2003 Posts: 684 St. Charles, MO.	With the engine warmed up, with the car stopped, foot on brakes, put tranny in high gear, while watching the tach, floor it, and let off the gas right away. The highest rpm reading is your flash stall. Set your launch rpm 400 - 600 rpm under the flash stall. You'll shock the converter less than what you are now, and also the engine should be in it's sweet spot. 1994 Undercover Chassis 125" altered stack injected big block, soon blown and injected Member of The Torque and Recoil Club

Re: transbrake=wheelstand [Re: Slingshot383] #1379308 01/31/13 02:42 PM 01/31/13 02:42 PM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	Link for video. Sorry its so bad, it was from a friend's cell phone http://www.youtube.com/watch?v=7YiLqQKWCjo&list=HL1359653934&feature=mh_lolz

Re: transbrake=wheelstand [Re: 416challenger] #1379309 01/31/13 02:46 PM 01/31/13 02:46 PM
Joined: Jan 2003 Posts: 25,926 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 25,926 United Socialist States of Ame...	That isn't so bad..Here is my 3400# beater leaving at 3400 rpms.. 7568672-shott3.jpg (377 downloads)

Re: transbrake=wheelstand [Re: tboomer] #1379310 01/31/13 02:51 PM 01/31/13 02:51 PM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	That was the only video we got, some of the others were higher. The problem is the car is pretty low and the header collector on the drivers side is only about 2-3" from the ground and I would hate to smash it. With out the transbrake it will run almost as fast, but it does not pick up the front end at all.

Re: transbrake=wheelstand [Re: 416challenger] #1379311 01/31/13 03:18 PM 01/31/13 03:18 PM
Joined: Jan 2007 Posts: 40 New Braunfels, TX B BigBlockScamp member
BigBlockScamp member B Joined: Jan 2007 Posts: 40 New Braunfels, TX	Put a big block in it.......

Re: transbrake=wheelstand [Re: 416challenger] #1379312 01/31/13 03:25 PM 01/31/13 03:25 PM
Joined: Feb 2005 Posts: 20,174 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,174 PA.	Kinda hard to tell from that video but it looks like it pulled to the left on that pass. Looks like its lined up pretty nice so if it did pull to the left you may have to play with your ladder bar pre-load. Sounds great and its running some nice numbers. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: transbrake=wheelstand [Re: 416challenger] #1379313 01/31/13 04:37 PM 01/31/13 04:37 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	Several things I have treid over the years to calm the car down on the starting line and limit the hieghts of the wheelies,stiffen up the front shocks or tie the front suspension down with a travel limiter,put the ladder bar in the lowest hole in the front, make the stall RPM as high as posiible so the motor CAN'T flash the converter at all, ie throttle on the floor on the trans brake when the first bulb lights up, WOT Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: transbrake=wheelstand [Re: Cab_Burge] #1379314 01/31/13 06:19 PM 01/31/13 06:19 PM
Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY HEMIFRED master
HEMIFRED master Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY	Quote: make the stall RPM as high as posiible so the motor CAN'T flash the converter at all, ie throttle on the floor on the trans brake when the first bulb lights up, WOT home of the Sox and Martin Hemi Duster

Re: transbrake=wheelstand [Re: Cab_Burge] #1379315 01/31/13 06:44 PM 01/31/13 06:44 PM
Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw...	One thing to consider is just how much starting line ratio you have. At a certain point, the car can pull the front into a wheelstand no matter what you do, if it gets traction. Here are the numbers from my car, and why I fought wheel stands for so long. 106 inch wheel base = 8.833 ft. 800 ft/lbs torque x converter multiplication(2)=1600 x low gear (2.45)= 3920 ft lbs x rear gear (4.56) = 17875 ft lbs x .90 (driveline loss) = 16087 net ft lbs torque at the hit. Rear tire radius is 33/2, or 16.5 inch. divide torque (16087) by tire radius, multiply by 12 inch, and you have the torque in ft lbs which acts against the whole car. Now divide that by the wheel base (8.833ft) and you know how much front end weight the car can DEAD LIFT, no spring help, etc. Mine comes out to 1324 lbs. With a front weight of only 1480, it doesn't take much help at all to go on the bumper instantly. When you figure in the fact that the torque is actually working against a center of gravity about 20 inches off the ground, it reduces the required lifting torque even more. You can move some weight forward, which to me is a better solution than tying the front down because you can shock the tires just enough to get the front in the air a bit, and after that the front/rear distribution does not mean a thing, the rear tires are carrying it all anyway. I made a change from 1480 on the front to 1600. That may seem like a lot, and it is. But the car is now controllable and very consistent. You could start with a big weight move, and see if more rpm will hook the tires. lighten the front back up as needed. Last edited by gregsdart; 01/31/13 06:49 PM. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: transbrake=wheelstand [Re: gregsdart] #1379316 01/31/13 09:47 PM 01/31/13 09:47 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	on the issue of weight distribution not mattering once the front wheels are in the air... what about the torque moment around the rear axle? a 35 lb batter over the rear axle has a torque moment of what..a foot? so it's a 35 ft/lb torque load....but if you put it way up front, that's 35 lbs times...10 feet? that's 350 ft lbs of "counter torque" I'm still trying to learn as much about how to set up suspensions as I can, but it would seem to me that even if you DO have both front wheels in the air, and all the weight is on the rear, that your weight distribution can still have an effect on controlling wheel stands also in that video...I agree, looks like he got squirley. does the car leave straight and the track had poor prep causing it to pull one way or the other? or does it do taht every time? it sounded like he had to let off the gas because of how out of shape it was getting. Photobucket sucks

Re: transbrake=wheelstand [Re: 70Cuda383] #1379317 01/31/13 09:57 PM 01/31/13 09:57 PM
Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw...	Quote: on the issue of weight distribution not mattering once the front wheels are in the air... what about the torque moment around the rear axle? a 35 lb batter over the rear axle has a torque moment of what..a foot? so it's a 35 ft/lb torque load....but if you put it way up front, that's 35 lbs times...10 feet? that's 350 ft lbs of "counter torque" Funny you should mention the battery, because that is exactly what I moved, plus more. The battery was a 40 lb unit, and it went forward 140 inches. I also went lexan in the rear window(15 lb lighter) and a glass trunk lid, for another 35 lbs. The effect was more than the actual weight moved, because the distance moved was more than the wheel base. My car needs that much extra resistance to offset the huge amount of launch torque. It sure does look like of OPs car needs it too. 7569302-Dartpics+others032.jpg (208 downloads) Last edited by gregsdart; 01/31/13 10:03 PM. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: transbrake=wheelstand [Re: gregsdart] #1379318 01/31/13 11:49 PM 01/31/13 11:49 PM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	I was hoping to make it out this Saturday, but it looks like I may have to go out of town for work. If I am in town I will be going. I will have to try to see where the converter is flashing to and go from there. I think I only have a 3000 and 3400 rpm chip for the low side, but I will try the 3400 to see if it helps. I will probably have to look at the ladder bars as two of the passes did try to go left on the launch.

Re: transbrake=wheelstand [Re: 416challenger] #1379319 02/01/13 12:15 AM 02/01/13 12:15 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	If the car was straight on the launch, you have too much pre load on the right bar... that will drive it to the left... increase in tire pressure will give you a controlled slippage at the tire... I dont know what pressure you have but try 1/2 pound increases till you tune it in... that'll get you up on the tire and should give you more MPH also... once you get it close then its 1/8 psi for final tune.... from your launch I would think its already in the lowest front hole... but if it isnt lower that .... the pic in my sig is great for pics but thats not how I normally leave... more like this pic... in this pic the RPM is lowered also 7569635-5-108.JPG (200 downloads)

Re: transbrake=wheelstand [Re: MR_P_BODY] #1379320 02/01/13 08:59 AM 02/01/13 08:59 AM
Joined: Jan 2003 Posts: 25,926 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 25,926 United Socialist States of Ame...	Just a thought here..and Mr P. can confirm this! When I first started using a brake,my car was pulling to the left,too. And the guy that did my chassis work is one of the best in the business! Turned out to be driver error. I was so used to footbraking the car and always launched with both hands on the wheel. My button is on the wheel and when I let it go,the car would come down and always go to the left. I changed my technique by resting my left arm on the door bar and holding the wheel in the 8:00 o'clock position..Bingo! Problem solved! I was jerking the wheel to the left! Car goes straight as an arrow! Need your rear end checked out? Contact Grizzly!!

Re: transbrake=wheelstand [Re: tboomer] #1379321 02/01/13 10:01 AM 02/01/13 10:01 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Just a thought here..and Mr P. can confirm this! When I first started using a brake,my car was pulling to the left,too. And the guy that did my chassis work is one of the best in the business! Turned out to be driver error. I was so used to footbraking the car and always launched with both hands on the wheel. My button is on the wheel and when I let it go,the car would come down and always go to the left. I changed my technique by resting my left arm on the door bar and holding the wheel in the 8:00 o'clock position..Bingo! Problem solved! I was jerking the wheel to the left! Car goes straight as an arrow! Yeah, many guys do that... I brace my elbow on the door window sill

Re: transbrake=wheelstand [Re: MR_P_BODY] #1379322 02/02/13 02:18 PM 02/02/13 02:18 PM
Joined: Jan 2003 Posts: 1,412 Johnstown 69dart pro stock
69dart pro stock Joined: Jan 2003 Posts: 1,412 Johnstown	I always rest my hand on my knee and hold the bottom of the wheel. Helps keep you from over driving the car. 33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4 68 Dart - 340 66 Belvedere - 400 Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage

transbrake=wheelstand "UPDATE" [Re: 416challenger] #1379323 02/16/13 01:31 AM 02/16/13 01:31 AM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	Well I was finally able to get back out to the track. I really did not have any where that I could check to see were the converter was flashing to. I did pull the chip out out the low side on the 2 step and the converter went to 4800 on the trans brake. The only chip I found close to that was 4100, so I installed it and tried it. It just made the wheelstand worse. It actually went on the rear bumper. It caught me off guard and I lifted instead of shifting, as it was still climbing. It came down kind of hard and dented the pan a little. https://www.youtube.com/watch?v=U1N066LYGyQ I played with the launch RPM and ended on 2500 rpms. The car left good, but is pulling to the right. I added some preload to the passenger side, but when I went to make another pass I noticed I now have a water leak at the radiator. I guess when I came down it twisted the radiator a little. I will try to find a shop to repair it and head back out on Sunday. https://www.youtube.com/watch?v=TkidPFOvDyU Last edited by 416challenger; 02/16/13 01:09 PM.

Re: transbrake=wheelstand "UPDATE" [Re: 416challenger] #1379324 02/16/13 05:42 AM 02/16/13 05:42 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	you have the same problem I do, you better put some wheelie bars on that thing while your trying to figure it out.

Re: transbrake=wheelstand "UPDATE" [Re: Quicktree] #1379325 02/16/13 12:46 PM 02/16/13 12:46 PM
Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,000 Frostbitefalls MN (Rocky&Bullw...	Quote: you have the same problem I do, you better put some wheelie bars on that thing while your trying to figure it out. Add the longest wheelie bars you can and still get the car in the trailer and test till it looks like it is working well. Then shift weight forward (if the car isn't repeating like a machine)till the car is as consistent as it can get. Go win races. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: transbrake=wheelstand "UPDATE" [Re: 416challenger] #1379326 02/16/13 03:24 PM 02/16/13 03:24 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	Leave the chip out and try that with your foot on the floor when the first light comes on Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: transbrake=wheelstand "UPDATE" [Re: Cab_Burge] #1379327 02/16/13 03:31 PM 02/16/13 03:31 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	Quote: Leave the chip out and try that with your foot on the floor when the first light comes on I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379328 02/16/13 03:34 PM 02/16/13 03:34 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	Quote: Quote: Leave the chip out and try that with your foot on the floor when the first light comes on I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). different cars with different suspension and converters have different results Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: transbrake=wheelstand "UPDATE" [Re: Cab_Burge] #1379329 02/16/13 03:41 PM 02/16/13 03:41 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	Quote: Quote: Quote: Leave the chip out and try that with your foot on the floor when the first light comes on I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). different cars with different suspension and converters have different results Does this work in your car Cab? Leaving against the converter at 4-5000 where ever it maybe is a softer launch than at 2500? -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: transbrake=wheelstand "UPDATE" [Re: Cab_Burge] #1379330 02/16/13 03:41 PM 02/16/13 03:41 PM
Joined: May 2004 Posts: 952 Stockholm, Sweden MrSixpack super stock
MrSixpack super stock Joined: May 2004 Posts: 952 Stockholm, Sweden	Why not try to footbrake? I did that with my car and I dropped from 1,38 to 1,32 in 60 feet and much lower wheelies. And the best buy I did for my combo was Afco dual adj. shocks. Good Luck 1970 Super Stock Challenger ex. Paul Rossi 1968 Dodge Dart GT 340 1968 Dodge Charger /6 3 speed manual 1966 Chrysler 300 Loaded 1968 Dodge Charger R/T 440 1968 Mini Cooper

Re: transbrake=wheelstand "UPDATE" [Re: Cab_Burge] #1379331 02/16/13 03:43 PM 02/16/13 03:43 PM
Joined: Feb 2005 Posts: 20,174 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,174 PA.	In the video in the beginning of this post the car went to the left, and now to the right. Did you make a chassis change between races. If not you better start making sure tire pressure is the same right and left, check track prep and car alignment, or see if the driver is some how doing it. PLEASE don't take this personal but when a car leaves the line like that you better learn not to get back in the throttle because either you are going to wreck the car, do engine damage, or maybe DAD with take over driving HIS car again. Its not worth it. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379332 02/16/13 03:49 PM 02/16/13 03:49 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	Triple threat, I tried that with my dart. 51% of my car weight is on the front, 49% rear. My wheelie bars are set at 2 inches off the ground. If I flash my converter, i'm hard on the wheelie bars, but when I load it up on the stall, it doesn't hit the bars as hard. I'm not sure if it's because of the limiters I have on my front suspension maybe, after a couple of inches of rise, my car has to pick up the whole front end. but what you are saying isnt always true. I even put max adjustment on my bars to see, and it was the same. This may all change with his shorter wheel base tho.

Re: transbrake=wheelstand "UPDATE" [Re: Mopar-Al] #1379333 02/16/13 04:49 PM 02/16/13 04:49 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	Fair enough, but I still don't see going up being a good idea as he already went up to near the stall point and it made it worse. The car obviously has other issues, it needs to go straight regardless of how high the wheels are in the air.

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379334 02/16/13 06:54 PM 02/16/13 06:54 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	Yeah, but he has a lot of adjustments he needs to do, to get it dialed in. My 72 cuda used to do 2 ft tall wheelies. Some liked it, I didn't. It was a 3800 lb car running 9.85-9.92's no bars, we went back to the shop and made a some corrections for the IC and got it to where it did no wheelies and ran the same times, with a 9.82 best run. 5500 0n the stall and transbrake.

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379335 02/16/13 09:26 PM 02/16/13 09:26 PM
Joined: Aug 2003 Posts: 43,185 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,185 Bend,OR USA	Quote: Quote: Quote: Quote: Leave the chip out and try that with your foot on the floor when the first light comes on I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). different cars with different suspension and converters have different results Does this work in your car Cab? Leaving against the converter at 4-5000 where ever it maybe is a softer launch than at 2500? It works on all the foot brake cars I've raced BUT, I haven't raced a trans brake car in a lot of years, soon to change sometimes you have to go the wrong way on testing to find out which way the wrong way is Never rule out trying something old on a new problem, what works on one car usually work again in a similar situation Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379336 02/16/13 11:08 PM 02/16/13 11:08 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Quote: Leave the chip out and try that with your foot on the floor when the first light comes on I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). I am going to do some testing with rpm launches, I am going to go out on a limb and agree with you before hand.

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379337 02/16/13 11:41 PM 02/16/13 11:41 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Does this work in your car Cab? Leaving against the converter at 4-5000 where ever it maybe is a softer launch than at 2500? Works on my car but I have to vary the tire pressure to work on different tracks... a 1/4 psi to 1/2 psi to control the lift and get the tire speed to what I want.... I leave on the conv all the time... but Tony might have to move the IC back to keep the front down NOTE the pic in my sig is for pics not the way it leaves on the normal basis EDIT even here I needed more air.. I was a 1/4 psi low 7591200-5-108.JPG (138 downloads) Last edited by MR_P_BODY; 02/16/13 11:43 PM.

Re: transbrake=wheelstand "UPDATE" [Re: Triple Threat] #1379338 02/16/13 11:58 PM 02/16/13 11:58 PM
Joined: Sep 2011 Posts: 369 California, USA!!! W WheelsUp73 enthusiast
WheelsUp73 enthusiast W Joined: Sep 2011 Posts: 369 California, USA!!!	Quote: Quote: I 100% disagree. Higher launch RPM 99% of the time is going to result in a more aggressive launch aka bigger wheel stand. This theory people say about leaving against the converter so it doesn't "flash" has never held true with anything I've seen. I've tried it many times in different cars with the same result. Keep the RPM low. And fix the turning right issue (add pre load). I agree with ya, My car has pulled a few hundred big wheelies and I can tell you that the higher the launch RPM the harder it gets up on the bumper. http://youtu.be/fAP_2rxz_GA

Re: transbrake=wheelstand "UPDATE" [Re: MR_P_BODY] #1379339 02/17/13 12:05 AM 02/17/13 12:05 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Does this work in your car Cab? Leaving against the converter at 4-5000 where ever it maybe is a softer launch than at 2500? Works on my car but I have to vary the tire pressure to work on different tracks... a 1/4 psi to 1/2 psi to control the lift and get the tire speed to what I want.... I leave on the conv all the time... but Tony might have to move the IC back to keep the front down NOTE the pic in my sig is for pics not the way it leaves on the normal basis EDIT even here I needed more air.. I was a 1/4 psi low what do you mean move it back?

Re: transbrake=wheelstand "UPDATE" [Re: MR_P_BODY] #1379340 02/17/13 12:06 AM 02/17/13 12:06 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Does this work in your car Cab? Leaving against the converter at 4-5000 where ever it maybe is a softer launch than at 2500? Works on my car but I have to vary the tire pressure to work on different tracks... a 1/4 psi to 1/2 psi to control the lift and get the tire speed to what I want.... I leave on the conv all the time... but Tony might have to move the IC back to keep the front down NOTE the pic in my sig is for pics not the way it leaves on the normal basis EDIT even here I needed more air.. I was a 1/4 psi low

Re: transbrake=wheelstand "UPDATE" [Re: Quicktree] #1379341 02/17/13 12:08 AM 02/17/13 12:08 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	what do you mean move it back? Shorten your IC on the 4 link(shorter and lower)

Re: transbrake=wheelstand "UPDATE" [Re: MR_P_BODY] #1379342 02/17/13 12:25 AM 02/17/13 12:25 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	Quote: what do you mean move it back? Shorten your IC on the 4 link(shorter and lower) heck thats the opposite of what i have been told.

Re: transbrake=wheelstand "UPDATE" [Re: Quicktree] #1379343 02/17/13 01:06 AM 02/17/13 01:06 AM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	Thanks guy for all the help. I am not really sure why the car was going left on the initial launches when I first tried the transbrake. Last night the car was pulling to the right on the release of the transbrake after I calmed down the front end. I am not sure if it was the track or what. The first passes were a test and tune night and this weekend is a prepped track for an 1/8 mile bracket race. I have now lowered the launch rpm to 2500 rpms and added 2 flats on the passenger side ladder bar and it is leaving straight and only pulling the front end about 6" and carrying it. I totaly understand not letting off the throttle under a big wheel stand, but it caught me off guard. The pass on the bumper was the the first pass with trying to raise the launch rpm as suggested to reduce the wheelstand. I am new to leaving on the transbrake, but I have been footbraking for many years. Normally when I foot brake the car it is really uneventful. I launch footbraking and the car has an electric shifter, so my hand are not on the shifter. I just hold on and go for a ride.

Re: transbrake=wheelstand "UPDATE" [Re: 416challenger] #1379344 02/17/13 02:32 AM 02/17/13 02:32 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Thanks guy for all the help. I am not really sure why the car was going left on the initial launches when I first tried the transbrake. Last night the car was pulling to the right on the release of the transbrake after I calmed down the front end. I am not sure if it was the track or what. The first passes were a test and tune night and this weekend is a prepped track for an 1/8 mile bracket race. I have now lowered the launch rpm to 2500 rpms and added 2 flats on the passenger side ladder bar and it is leaving straight and only pulling the front end about 6" and carrying it. I totaly understand not letting off the throttle under a big wheel stand, but it caught me off guard. The pass on the bumper was the the first pass with trying to raise the launch rpm as suggested to reduce the wheelstand. I am new to leaving on the transbrake, but I have been footbraking for many years. Normally when I foot brake the car it is really uneventful. I launch footbraking and the car has an electric shifter, so my hand are not on the shifter. I just hold on and go for a ride. As you change the launch rpm you change the torque applied to the rear end... that changes the amount the rear end is trying to roll around the drive shaft... the more torque you apply the rear loads the left rear driving the car to the right(left rear tire works harder).... and visa versa

Re: transbrake=wheelstand "UPDATE" [Re: Quicktree] #1379345 02/17/13 02:46 AM 02/17/13 02:46 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: what do you mean move it back? Shorten your IC on the 4 link(shorter and lower) heck thats the opposite of what i have been told. If its shorter it lifts more from the rear instead of out forward.... also run a little more air pressure so it has a controlled slippage on the tire... that'll give you a better 60'

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