joblo1978

iTrader: (14)

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Its about time to pull the trigger on an S60 but I'm still confused on gear choice for M6 street/strip car.

Car is right around stock weight (3500 without driver) after some weight reduction. Will have a little bit more here soon on the street and even more for the strip. Making 518 RWTQ with similar HP at lower RPM's. Shifting around 6200-6400 RPM's also.

The car is in the most recent GMHTP if you've seen it.

I'm looking to run a 26" tire, but can go up maybe another inch if I have to on the track.

I've heard I may run out of 4th gear with 4.10's which I definitely don't want.

What about 3.90's?

What's the best way to select gears for an FI car? I'm hoping to only do this once.

joblo1978

iTrader: (14)

Nobody has any advice on what gear to go with and why?

AINT SKEERED

iTrader: (2)

if its a 6spd, i would say 3.73's and let the tq work.

joblo1978

iTrader: (14)

Why not 4.11's? Because I don't think 3.73's will get me in my peak powerband in 4th on the backend nor give me the MPH.

A buddy of mine with similar numbers on the spray isn't getting the most out of them. I'm also currently racing at high altitude so those are SAE corrected numbers.

BlackScreaminMachine

iTrader: (17)

4.10's and dont look back. Get a 28" tall tire if your running out and also consider bumping the redline up.

joblo1978

iTrader: (14)

That's what I'm thinking, I'll try my 26.5 DR and go up in a slick if I need too. But if I run out, I'll be deep in the 11's anyway,so not too worried about it.

AINT SKEERED

iTrader: (2)

that roots blower should be in the power band starting early. every car i see that is blown, likes a little load. 4.10s are great in my t/a even on the spray but i also dont mind turnin 7000 rpms

AINT SKEERED

iTrader: (2)

I had a friend with a pro charged trans am. stock motor , 4.10's was to much for it. the car had more time in each gear to use the power with 3.73's and was quicker
i would think that maggie has more lowe end and midrange tq then a procharger and would not need as much gear

joblo1978

iTrader: (14)

Well, I just ordered an S60. They would have liked to see me in 3.90's, but they weren't available with an S60, so 4.10's it is.

AINT SKEERED

iTrader: (2)

one thing about 4.10's is you can always go a little taller on the tire and with that much tq, you may need it for traction. Good luck with it.

joblo1978

iTrader: (14)

Yeah, I can, but than that changes the final drive ratio.

I need more front suspension work to get the car to hook properly.

Tire size will most likely be the last thing to figure out. Just have to see how it does at the track once it's all done.