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launch RPM's #1413002 04/01/13 12:28 PM 04/01/13 12:28 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree OP I Win
Quicktree OP I Win Q Joined: Jan 2003 Posts: 32,394	we were talking about launch rpm in another thread where people were saying to raise the rpm to make the launch softer or less violent. I personally have never seen that work. every car I have driven would be more violent as the rpm's go up. my arrow was doing a monster wheel stand at 5200. I left this weekend at 3000 and it was like being on a sunday drive. it lifted the from wheels maybe 2" and set them back down. the 60" was exactly the same nothing lost.still couldn't keep it from red lighting even after taking a bunch of shims out of the tb button. there are obviously a bunch o different factors involved.

Re: launch RPM's [Re: Quicktree] #1413003 04/01/13 02:58 PM 04/01/13 02:58 PM
Joined: Jan 2012 Posts: 2,652 Stuttgart, Arkansas rickseeman master
rickseeman master Joined: Jan 2012 Posts: 2,652 Stuttgart, Arkansas	I'm with you. Lower is less violent to me. ET might be better leaving higher, but I like leaving low. 2011 Drag Pak Challenger

Re: launch RPM's [Re: Quicktree] #1413004 04/01/13 05:14 PM 04/01/13 05:14 PM
Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...	The lowest I can make em hook and be consistent is best in my opinion. When I moved weight forward to settle wheel stands, I had to raise the launch rpm to hit the tires harder and stick them. Still, I am well below full throttle. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: launch RPM's [Re: Quicktree] #1413005 04/01/13 05:39 PM 04/01/13 05:39 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . Fastest 300

Re: launch RPM's [Re: Crizila] #1413006 04/01/13 05:45 PM 04/01/13 05:45 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree OP I Win
Quicktree OP I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . not in a light car

Re: launch RPM's [Re: Quicktree] #1413007 04/01/13 06:21 PM 04/01/13 06:21 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . not in a light car I don't own a light car. Fastest 300

Re: launch RPM's [Re: Crizila] #1413008 04/01/13 09:23 PM 04/01/13 09:23 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Quote: Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . not in a light car I don't own a light car. That be your fault, buckwheat Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: launch RPM's [Re: Cab_Burge] #1413009 04/01/13 10:48 PM 04/01/13 10:48 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . not in a light car I don't own a light car. That be your fault, buckwheat Changing your launch RPM will make a difference in RT in any car. Agree that the heavier the car, the more the difference will be. On the plus side for heavy cars - no chance of a blow-over. Fastest 300

Re: launch RPM's [Re: Crizila] #1413010 04/02/13 02:37 AM 04/02/13 02:37 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Quote: Quote: Quote: Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . not in a light car I don't own a light car. That be your fault, buckwheat Changing your launch RPM will make a difference in RT in any car. Agree that the heavier the car, the more the difference will be. On the plus side for heavy cars - no chance of a blow-over. Touche, Senor Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: launch RPM's [Re: Crizila] #1413011 04/02/13 05:43 PM 04/02/13 05:43 PM
Joined: Apr 2009 Posts: 3,415 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,415 Toronto	Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . Leaving at a lower rpm slows down the r/t's?

Re: launch RPM's [Re: mshred] #1413012 04/02/13 06:03 PM 04/02/13 06:03 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: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . Leaving at a lower rpm slows down the r/t's? Yes -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: launch RPM's [Re: Triple Threat] #1413013 04/02/13 06:34 PM 04/02/13 06:34 PM
Joined: Apr 2009 Posts: 3,415 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,415 Toronto	Quote: Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . Leaving at a lower rpm slows down the r/t's? Yes I guess that makes sense since you would be leaving with less inertia, or in the case of a converter car there is that time it takes for the converter to flash up to the stall rpm?

Re: launch RPM's [Re: mshred] #1413014 04/02/13 06:39 PM 04/02/13 06:39 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree OP I Win
Quicktree OP I Win Q Joined: Jan 2003 Posts: 32,394	Quote: Quote: Quote: Quote: Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know . Leaving at a lower rpm slows down the r/t's? Yes I guess that makes sense since you would be leaving with less inertia, or in the case of a converter car there is that time it takes for the converter to flash up to the stall rpm? it would be more pronounced the heavier the car is. have driven heavy cars now in a super light one the difference is huge. my 60' was exactly the same and i seen little change in rt

Re: launch RPM's [Re: Quicktree] #1413015 04/02/13 07:00 PM 04/02/13 07:00 PM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 master
StealthWedge67 master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	My car is a heavy street B-Body. I have found that lowering Launch RPM's slows BOTH my RT and 60'. I think this is unique to the combo, though. LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: launch RPM's [Re: StealthWedge67] #1413016 04/02/13 07:16 PM 04/02/13 07:16 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I have left from an idle up to coming up on the converter to 2500. I like it best coming up on the converter to about 2000 as my heavy B-body seems to like that about the best with my 9.5 Dynamic converter. Ron Last edited by 383man; 04/02/13 07:17 PM.

Re: launch RPM's [Re: StealthWedge67] #1413017 04/02/13 08:51 PM 04/02/13 08:51 PM
Joined: Oct 2003 Posts: 4,013 South Park, Pa. 68LAR master
68LAR master Joined: Oct 2003 Posts: 4,013 South Park, Pa.	Quote: My car is a heavy street B-Body. I have found that lowering Launch RPM's slows BOTH my RT and 60'. Mine too, and there is a definite difference with both as it relates to launch rpm. Very noticeable with a heavy stick car. 4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight

Re: launch RPM's [Re: 68LAR] #1413018 04/02/13 09:19 PM 04/02/13 09:19 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	You are looking at 2 back to back passes ( car #300). Left side is launching at 2700rpm. Obviously went red - for the second time over the weekend. Pass on right was with two changes; dropped a pound out the tires and launched at 1100rpm. Just about dead on my dial. 7652312-timeslips.jpg (67 downloads) Fastest 300

Re: launch RPM's [Re: Crizila] #1413019 04/02/13 11:15 PM 04/02/13 11:15 PM
Joined: Nov 2009 Posts: 3,082 St. Paul , Mn. tubtar master
tubtar master Joined: Nov 2009 Posts: 3,082 St. Paul , Mn.	RT may slow if nothing else changes , but it is easy to remedy with a box and can still be regained with practice in a foot brake car.........can't it ? I'm trying to understand the logic.......the RT is from green till when the wheels break the beam. Being a foot brake kind of guy , I would then try to shade the last bulb or stare hard at the second of the last to get it back. Not real scientific , but getting myself to find that sweet spot and making it part of the routine ought to do it I think.

Re: launch RPM's [Re: Crizila] #1413020 04/02/13 11:17 PM 04/02/13 11:17 PM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 master
StealthWedge67 master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	Based on those slips and your launch RPM info, you're in the same boat with most of us: RT and 60' slowed dramatically with the lower RPM. LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: launch RPM's [Re: StealthWedge67] #1413021 04/03/13 08:09 AM 04/03/13 08:09 AM
Joined: Jan 2003 Posts: 25,955 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 25,955 United Socialist States of Ame...	Interesting topic..I have launched at 4800 then I have it at 3400 now. R/Ts stay about the same and very little difference in the 60'. They only difference between the two is at the lower rpms,it doesn't leave as violent...

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