slowtegkauai

I have a dc2 with a jdm itr stock transmission, 81.5mm. lsv turbo, 13 x 10 front wheels with 24.5'' MT slicks 7-8psi. No traction bars, new hard race bushings in front upper and lower arms and rear toe, camber and trailing arms.
I have a pair of front strange struts on order. Rear struts are blox drag with 18k springs.
Time slip...
60- 1.718
660- 7.19 103mph
1320- 10.85 136mph on rev limiter @9400rpm.

Would I be better off with a 4.0 final or switching to a gsr transmission?

Any other suggestions are welcomed, thank you.

ATYPR

Reducing pressure in the slicks will help

Turbo-LS

iTrader: (4)

Type R trans gearing to to short for drag racing unless running tall tires. Gsr is ideal for most builds. The shorter gears your shifting sooner. Make sure your shifing after the 60ft market into second gear but with type r trans most likely you're out of gear before the 60

we run 7.5-8 psi tire pressure in our car. Play with launch rpm and how much boost you're building on the launch control. You have to make adjustments and find a good balance.

93egSLEEPER

B16 and ITR tranny's really aren't meant to go on turbo cars w/ a good amount of power. The gearing is just too short. Find an all motor guy w/ a GSR tranny and trade him. Both will win in that situation. Shorter gears are preferred for us all motor guys.

slowtegkauai

Yeah Im shifting before the 60ft. Launching at 7400rpm at 12lbs boost. I did lower it to 7lbs boost which is the lowest i can go and still spins and pulls same 60ft times.
I have a jdm gsr transmission that I could try but I am unsure of the gear ratios in that trans. Would it be same as a usdm gsr transmission?

Blown90hatcH

So much miss information in here. A matched shorter geared trans will accelerate quicker assuming you can get the traction. The fact that you are out of mph will help you decide what final and gearing you want. Look at your logs and shift points vs. torque curve, etc. and see where you are shifting. Changing the final drive will change all the gear ratios. Changing the single gears will affect those shifting zones.

Most people opt for a GSR geared trans because it is a good for most turbo setups. It's not optimal for all and unless you just want a neutral pick of a gear ratio setup, do more homework and make some informed decisions.

Changing the trans around to fix your poor traction problems on your 60' is a bandaid. Plenty of other things you can do first.

hardcore97

so you complain about misinformation, and then agree with what was said? if hes shifting before the 60' hes geared too short, no arguing that. that could be addressed with a taller tire and raising the rev limit if thats viable, but then you have to deal with breaking things when you move to a 26" tire because it WILL find your weak spots

DDTECH

Start @ 8 psi and drop every run.

Check your pressure after your burnout and before, keep it constant..

Find you're lowest launching rpm and use that, if you come out too hard, you'll spin, come out too low you'll bog, you want some spin but nothing radical.. I have a ITR trans and coming out the hole on nitrous i've been able to cut some low 1.6's high 1.5s, the biggest issue is shifting before the 60', rev your first gear out higher... follow what blown said.

jimmyjun0213

I would go with a 4.40fd and a longer 3.07 first gear for better 0.60ft

slowtegkauai

Sounds good. l will try lowering the launch rpm but my problem is we only have 3 test runs. After that its bracket elimination rounds. So my et times will for sure be inconsistent.

It looks like I have to do a 4.0 final drive or do a complete 1st 2nd 3rd and 4th gear change. If I were to go with a longer first gear and leave the rest of the gears stock, my mph will be so close to my second gears mph that ill be shifting into 3rd sooner than i am now. The gear calculator says between first and second gear, I have a 20mph difference with a 3.07 1st gear and a stock 2.10 2nd gear. Compare that to my stock 3.23 1st gear and stock 2nd gear I have a 25mph difference. I'm not sure but would that hurt traction in second gear more so than with a stock first gear?

Thank you for helping.