need to figure out gearing/correct tire size

[one eyed willy]

My car is turbo and i would think makes the most power in 4th. problem is i BARELY ever see 4th in the quarter mile. im usually right at the top of third and shifting into 4th right at the very end.

i have 3.55's, stock 3650 on 26" tall tires.shifting at 6500rpm.

i currently trap about 119mph @ 11.3, when i was using 28" tall tires i was trapping 123mph.

my 60's are 1.5-1.6.

traction is not a issue and power is not a issue. i need some insight on gearing and tire size to put my shifting in the correct spots.

a taller tire would only slow down my shifting correct?

 

[Irishman]

Either lower gearing or taller tire should help get rid of the extra shift at the end of the track. Plus turbos like a lower gear to keep the load on the engine longer to take advantage of exhaust for boost.

 

[JeremyH]

Yeah, different ballgame, you dont need to use that 4th 1:1 gear at all, the turbo doesnt care, the car will be faster trapping at the top of thirrd. I have the same problem i have to shift to 4th literally right before i cross the stripe at the 1/4, this is with 27" tall tires and 3.55s i know this is costling me a couple tenths, i wanna get some 28-28.5" for the back and trap at the top of third around 6900 rpms. Or go to 3.31s if i have to. If your gonna use fourth you would need to use all of its power band which just aint gonna happen unless your trapping 140-150mph ish lol, to use all of 4th that means you would need like 4.30/4.56 gears which would make your car slowler.

Im also moving towards a 6060 swap, with the 6060s taller gears and 3.55s out back the 1/4 mile would come easly some where at the top end of thrid. I have a feeling with a 6060, 3.31 gears, and 28.5" tire you could almost 1/4 in top of second!

The 6060s first gear is going to be sick with a turbo! While your oponents already shifted to 2nd your full boosting 1st gear out to 60-65mph!

Less shifts, taller, gears, more load is the way to making a turbo stick car faster.

Of course wot box shifts help bend these rules a little.

 

[WarFords]

I do 3.73's and 28" tall slicks wit my 5 speed! My traps ranged from 129-135mph. I thought it worked great!

 

[one eyed willy]

well im gonna get some 28" tires for sure....soon as i get past my latest problem!

 

[JeremyH]

Just bought a 6060 today. That should make the 3.55s more like 3.31s!

 

[one eyed willy]

good,im curious what you will think......i was SOOO close to getting one and backed out becuase i was thinking i would have to do gears too.

 

[JeremyH]

good,im curious what you will think......i was SOOO close to getting one and backed out becuase i was thinking i would have to do gears too.

I will let you know how it goes!