fstr n u

I am currently running a Moser 12 bolt rear end with 3.90 gears. There is no boost in 1st gear, 2nd gear and on hit boot around 3,000-3,500rpms.

Would there be any difference if i was to run a 3.42 gear set or a 3.23? If so what should i expect to see/feel?

buick_lsx

What's the turbo specs...and sure there isn't a boost leak anywhere??

Bigtoyz

iTrader: (2)

The problem when running low gears with turbos is that you are not loading the motor down. Puttin a load on it causes it to work and give you that exhaust heat you need to spin the turbo(s).

You put 3.23's in it you will put a load on i and you will get boost. You running 4L60E I take it? I set mine up so I can leave it in second and it will
shift its self at 6300 and then I shift it myself.

Lower gears are not the answer to all. I raced another LT1 SC'ed car that was auto with 4.10's or something like that. I smoked him off the line and walked away from him. He just sat there and spinning the tires while I hooked up and was gone.

fstr n u

I don't have a boost leak...got that all sorted out.

I have a 6spd manual with 3.90 gears and am ripping through 1st gear before boost can build...even though when i shift the blow off valve still makes it's distinctive sound

I am wondering if a 3.42, 3.23 or a 2.73 gear would be more beneficial to my car with it's setup?

denmah

iTrader: (2)

yeah the gears are too short, throw on a tall *** tire and 3.23s for a trial run and see what happens.

turbo cars love to sit in gear and eat up mph.

also big turbo manual transmission with short gears is the worst thing you could do as far as lag and powerband for a turbo car.

throw 2.55 gears, 28 inch drag radial and a th400 in there with a 3000 stall and youll have boost whenever you want and youll do 75mph in 1st gear lol

stumprrp

iTrader: (2)

I agree with denmah i have 2.73s with a small 3000 stall and that thing just sits at 5,000 no matter where i punch it and pulls.

HRHohio

Try starting in 2nd gear and seeing how that works for you. That would be the equivalent of swapping in a 3.08 gear set in a 1998 w/ 6-speed tranny and 3.90 rear. It will feel slow in the 60 ft, but will pull like a MF through the whole gear because the turbo will build boost better.

www.f-body.org/gears

denmah

iTrader: (2)

hell yeah i can hit her in 1st and when boost is half way up just throw 3rd and let it eat!

stumprrp

iTrader: (2)

No kidding. I never had a car with such crap gear and it still pulls hard! No more doggy 40 rolls haha. I have substaintially less power then you but she still picks up nice @ 3600 lbs.

JoshuaGrooms83

iTrader: (2)

makes me kinda glad i still have my dinky stock 2.73 gears lol Hell zombie was pulling 10s with his T88 and 2.75 gears. thats insane to wrap your head around, at his level though, shorter gears would have started to benifit lol

speaking of which, hows ya'lls cars that still have the 2.73 gears running with rear moutns?

HRHohio

Any updates? Getting boost yet?

Twin turbo c5

I have never run a turbo car with any gear shorter than 355's they always work great in these fox body cars I have with 273's .they get on the boost like nobody's business!