T-Brake + Gearing ?'s
T-Brake + Gearing ?'s My car is a full weight Convertible 3800lbs+ off the brake all i can get is a best of a 1.60 short time this is with 27x10.5 Hoosier qtp's a 4.10 gear and spool.I would think I should be in the mid 1.5's at least N/A.Is this possibly too much gear or could it be too tight of a converter?The TC is a 8" ATI 4000 it was built for the spray but I would think it would perform a little better than that N/A even if it was built for the spray.Any help or ideas on getting this figured out would be appreciated.
Joe
Joe
i would think so too. my old '00 ss vert was 3850 with me in it and had stock 5.3 heads, ls6 intake, baby 224/228 cam, tci ssf 3500 stall, 3.90's in 12 bolt, same size m/t et street and cut a best 1.68 60' time through a stock 4l60e and ran 11.92 @ 114 mph.
do you know what you stall to off the spray? if you're setup to stall at 4000 on the spray & brake, chances are you've got something closer to a 3000-3200 stall on motor max.
what is your 1/4 time on motor?
on a side note, my 3.90's with a 3.08 first gear vs your 4.10 with a 2.52 1st gear is a HUGE difference. it's equal to having a 3.35 rear gear with a 4l60e when leaving in 1st gear. in other words, you'd need a 4.77 rear axle gear with your th-350 to launch with the same final 1st gear ratio as soemone with 3.90's and a 4l60e. understand?
1st gear final drive ratio...
4.10 x 2.52 = 10.332
3.90 x 3.08 = 12.012
do you know what you stall to off the spray? if you're setup to stall at 4000 on the spray & brake, chances are you've got something closer to a 3000-3200 stall on motor max.
what is your 1/4 time on motor?
on a side note, my 3.90's with a 3.08 first gear vs your 4.10 with a 2.52 1st gear is a HUGE difference. it's equal to having a 3.35 rear gear with a 4l60e when leaving in 1st gear. in other words, you'd need a 4.77 rear axle gear with your th-350 to launch with the same final 1st gear ratio as soemone with 3.90's and a 4l60e. understand?
1st gear final drive ratio...
4.10 x 2.52 = 10.332
3.90 x 3.08 = 12.012
Last edited by PRAY HRD; Oct 19, 2007 at 11:13 PM.
TECH Fanatic
Joined: Oct 2007
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From: Ventura County, California
My car is a full weight Convertible 3800lbs+ off the brake all i can get is a best of a 1.60 short time this is with 27x10.5 Hoosier qtp's a 4.10 gear and spool.I would think I should be in the mid 1.5's at least N/A.Is this possibly too much gear or could it be too tight of a converter?The TC is a 8" ATI 4000 it was built for the spray but I would think it would perform a little better than that N/A even if it was built for the spray.Any help or ideas on getting this figured out would be appreciated.
Joe
Joe
If you can list this then you can gear the car to hit the lights closer to your peak power.
Also where do you have the lower control arms, torque arm and pinion angle and shocks set at? If any of these are off it will effect the 60 ft.
So tell us this info and we can have a better idea which way to point you in.
What mph are you running? Have you had the car dynoed?
If you can list this then you can gear the car to hit the lights closer to your peak power.
Also where do you have the lower control arms, torque arm and pinion angle and shocks set at? If any of these are off it will effect the 60 ft.
So tell us this info and we can have a better idea which way to point you in.
If you can list this then you can gear the car to hit the lights closer to your peak power.
Also where do you have the lower control arms, torque arm and pinion angle and shocks set at? If any of these are off it will effect the 60 ft.
So tell us this info and we can have a better idea which way to point you in.
I'm still on the stock shocks and dont have any problems hooking up outta the hole off the brake on motor but i know i need some shocks soon so i guess that would be a big factor also.I have seen quite a few people here still running on the stock shocks and have pretty good 60's.I have got the Spohn rear drag sway bar that i will install today and hope that it will help me from leaving all twisted up in the rear.
i would think so too. my old '00 ss vert was 3850 with me in it and had stock 5.3 heads, ls6 intake, baby 224/228 cam, tci ssf 3500 stall, 3.90's in 12 bolt, same size m/t et street and cut a best 1.68 60' time through a stock 4l60e and ran 11.92 @ 114 mph.
do you know what you stall to off the spray? if you're setup to stall at 4000 on the spray & brake, chances are you've got something closer to a 3000-3200 stall on motor max.
what is your 1/4 time on motor?
on a side note, my 3.90's with a 3.08 first gear vs your 4.10 with a 2.52 1st gear is a HUGE difference. it's equal to having a 3.35 rear gear with a 4l60e when leaving in 1st gear. in other words, you'd need a 4.77 rear axle gear with your th-350 to launch with the same final 1st gear ratio as soemone with 3.90's and a 4l60e. understand?
1st gear final drive ratio...
4.10 x 2.52 = 10.332
3.90 x 3.08 = 12.012
do you know what you stall to off the spray? if you're setup to stall at 4000 on the spray & brake, chances are you've got something closer to a 3000-3200 stall on motor max.
what is your 1/4 time on motor?
on a side note, my 3.90's with a 3.08 first gear vs your 4.10 with a 2.52 1st gear is a HUGE difference. it's equal to having a 3.35 rear gear with a 4l60e when leaving in 1st gear. in other words, you'd need a 4.77 rear axle gear with your th-350 to launch with the same final 1st gear ratio as soemone with 3.90's and a 4l60e. understand?
1st gear final drive ratio...
4.10 x 2.52 = 10.332
3.90 x 3.08 = 12.012
For a car as heavy as your is, with stock shocks and that tire you aren't doing all that bad. I didn't care for that tire much on my car personally, but some people have good luck so it's a hit or miss.
Try putting the pinion angle a little closer to 0, you put too much in and it causes a bind that robs some power. Other then that, a set of shocks, and getting some weight out are probably gonna help the most.
If you loosen the converter up to get it to run n/a it's probably gonna be too loose for nitrous use, kinda leaves ya with the car running good n/a or good running on spray, you'll never get a converter that works great with both.
Try putting the pinion angle a little closer to 0, you put too much in and it causes a bind that robs some power. Other then that, a set of shocks, and getting some weight out are probably gonna help the most.
If you loosen the converter up to get it to run n/a it's probably gonna be too loose for nitrous use, kinda leaves ya with the car running good n/a or good running on spray, you'll never get a converter that works great with both.
The converter you have if set up for nitrous is not going to give you the launch rpms you need for N/A. You have to decide, nitrous or N/A. Your gear (4.10) is fine. A good set of aftermarket shocks will also help a good deal.
David
David
