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1/4 mile.. what gears do I need to run? #1310343 09/25/12 11:47 AM 09/25/12 11:47 AM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	I normally just run the 1/8 Mile. I'm headed to a 1/4 mile. My 410 makes peak power at 5800rpm. with 3:91 and 27" tire what Rpm should I be at with my 3:91 at the stripe? 7393866-pic047.jpg (172 downloads)

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310344 09/25/12 11:55 AM 09/25/12 11:55 AM
Joined: Apr 2007 Posts: 3,746 Riverside, California L Lil Demon master
Lil Demon master L Joined: Apr 2007 Posts: 3,746 Riverside, California	Nice looking car. Here is a really good calculator for ya: http://richmondgear.com/112901.html

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310345 09/25/12 11:55 AM 09/25/12 11:55 AM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	How fast is the car? With 3.91's, a 27" tall tire and 6% converter slip. 5825 RPM = 112.88 MPH Should be good enough for high 11's, if the car is faster than that not a big deal, most cars go across the finish line well above peak HP. -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: 1/4 mile.. what gears do I need to run? [Re: Triple Threat] #1310346 09/25/12 12:08 PM 09/25/12 12:08 PM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	Thanks for the kudos, its mostly street driven but been bringing back to its heritage. It ran a 7:52 @ 93 mph. Its a 4 speed. I just freshen the motor, so I dont know how fast it will go. It dynoed 499 hp/515 trq with a dual plane intake..any predictions? this is the car back in the day. 7393895-img105.jpg (114 downloads)

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310347 09/25/12 12:24 PM 09/25/12 12:24 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	Should run around 11.75 given the 1/8th mile numbers. Probably will cross just barely above your peak. Good looking car! -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310348 09/25/12 12:33 PM 09/25/12 12:33 PM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	Quote: this is the car back in the day. Too bad you didn't put it back like that ...

Re: 1/4 mile.. what gears do I need to run? [Re: JohnRR] #1310349 09/25/12 12:44 PM 09/25/12 12:44 PM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	Close John, all the decals are on magnets and "Purple Haze" should be done this week all Magnetic so I can put them on when I go to the track. Just recently let the original owner take it for spin who race it with a 13:1 340 and 513 gears. Really cool day!

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310350 09/25/12 01:38 PM 09/25/12 01:38 PM
Joined: Aug 2003 Posts: 43,195 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,195 Bend,OR USA	Quote: I normally just run the 1/8 Mile. I'm headed to a 1/4 mile. My 410 makes peak power at 5800rpm. with 3:91 and 27" tire what Rpm should I be at with my 3:91 at the stripe? Ideally you would like to be at peak HP RPM about a hundred feet before the 1/4 mile finish line, maybe a little sooner than that, depending on who you talk to My current car(727 with a 8 inch race converter) gets shifted at or above 7000 RPM in 1st and 2nd gear and crosses the 1/4 mile finish line between 6500 and 7000 RPM,Depending on which set of tires is on the rear( M/T ET Street 13.50x30x15 or M/T 10.5x31x15W slicks) 134.5 MPH on both sets It crosses the finish line in the 1/8 mile at 5900 to 6000 RPM, at 105 MPH iin high gear for less than 2 seconds Last edited by Cab_Burge; 09/25/12 05:32 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 1/4 mile.. what gears do I need to run? [Re: Cab_Burge] #1310351 09/25/12 01:57 PM 09/25/12 01:57 PM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	Sounds like I wont be changing out the gears Thanks for the help guys!

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310352 09/25/12 05:39 PM 09/25/12 05:39 PM
Joined: Apr 2009 Posts: 3,415 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,415 Toronto	with 4.10's and a 28" tall tire with the 4 speed, my 365 trapped around 5700rpms, so im thinking you might be close to that as well since your tire is an inch smaller and you have 3.91's. Also, not sure what tire you are running or how you are going to launch, but you should definitely be doing atleast 11.70's imo...My 3400lb pig ran 11.80's at 116 with horrible 60' foot times- could have had an 11.70 outta it with better hook, but it broke...oh,and my motor was making at most I think 450 at the crank good luck man!

Re: 1/4 mile.. what gears do I need to run? [Re: mshred] #1310353 09/25/12 06:29 PM 09/25/12 06:29 PM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	I'm running BF goodrich Comp drag radials 275/60/15. I may run slicks as I'm being told with a stick car they will absorb the shock more with stiffer side wall..? It pulls nice I'm hoping for mid 11's

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310354 09/25/12 09:59 PM 09/25/12 09:59 PM
Joined: Mar 2005 Posts: 3,142 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,142 Central NC	I would want a softer sidewall with a stick car to absorb the shock and allow it to hook. If you get too aggressive with the BFG they will likely go up in smoke. Get them hot nut no need for John Force burnouts with them.Start out easy and bring the rpm launch up 300-500rpm at a time until you get your best 60 ft. Be prepared to not run the number as 4 speed et's will humble most people w/o a lot of practice.Car should be capable of high 10's/low 11's if it hooks and doesent break.Don't expect it right away though.

Re: 1/4 mile.. what gears do I need to run? [Re: gch] #1310355 09/26/12 08:39 AM 09/26/12 08:39 AM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	Quote: I would want a softer sidewall with a stick car to absorb the shock and allow it to hook. If you get too aggressive with the BFG they will likely go up in smoke. Get them hot nut no need for John Force burnouts with them.Start out easy and bring the rpm launch up 300-500rpm at a time until you get your best 60 ft. Be prepared to not run the number as 4 speed et's will humble most people w/o a lot of practice.Car should be capable of high 10's/low 11's if it hooks and doesent break.Don't expect it right away though. Lots of good info thanks alot.. My best 60ft on the BFG was 1.59 and my launch was around 3500. But been having difficulty being consistant and its all been about getting out of the hole. But its way to much fun to change it over to auto.

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310356 11/09/12 08:31 PM 11/09/12 08:31 PM
Joined: Jan 2003 Posts: 1,240 Fairfield Maine H hemi4speed OP pro stock
hemi4speed OP pro stock H Joined: Jan 2003 Posts: 1,240 Fairfield Maine	Just an Update..having alot of fun bringing it back to the way it was in 1970...sure does get alot of looks going down main st..lol! 7455686-summer2011442.jpg (85 downloads)

Re: 1/4 mile.. what gears do I need to run? [Re: hemi4speed] #1310357 11/09/12 09:13 PM 11/09/12 09:13 PM
Joined: May 2004 Posts: 5,123 Warrenton, VA RoadRunnerJD master
RoadRunnerJD master Joined: May 2004 Posts: 5,123 Warrenton, VA	Are you running at the track with open headers? If you still get those 60' times, you should expect 11.50-11.70 times. For full race, I would consider a 4.30 rear and 29.5" tires if you could get 6500 rpm's out if it? Otherwise, if you are just going to race it occasionally and drive it on the street, it sounds like you have a good combination.

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