Black Snake

Isnt there a Sticky on this?

ToplessGT

well, I tried it with the extra tire 2.76 inches and still get wierd numbers. How does the od thing work. It says 1 for no od. If im driving w/ my aode and in od, what would I put in the calculator? Just want to know with P255/35/R18's and 2.73-3.73 gears @ 65 mph, what rpms I am at currently and would be at with 3.73's. With 2.73 gears now, I am at 1550 @ 65 w/ od on. Thanks for anymore advice on this.....

nitrous_bob

yes both the aod , and t5 have a od of .68:1

so 3rd in aod , 4th in aod is equal to 4th in a t5 and 5th in a t5

1:1 for the highest non-od gear respectively.

and topless.........

your od is .68
tire size use either the full metric size(like 255/55/16)...or 26 inch tall , a stock tire tire measures under 26 " yall though. about 25.5 "


here is 4.10's ..... Your tire's diameter is 25.028 inches
At 65 MPH in 5th gear, your motor is turning at 2,254.9 RPM

Your tire's diameter is 25.028 inches
At 65 MPH in 5th gear, your motor is turning at 2,144.9 RPM .... this is 3.90 gears

w/ the 3.73's = Your tire's diameter is 25.028 inches
At 65 MPH in 5th gear, your motor is turning at 2,051.4 RPM

for a comparison....here is the calc w/ 2.73's and it's right on w/ your quote....Your tire's diameter is 25.028 inches
At 65 MPH in 5th gear, your motor is turning at 1,501.5 RPM

FullAuto

Who cares about the highway? Figure out about what mph you want to trap at and calculate the gear by factoring your tires and desired rpm. I initially went with 4.10s in my AOD car but bumped the rev limiter with the nitrous before the finish line. I went with 3.73s then rather than switch to a 28" tire.

ToplessGT

nitrous_bob
Thanks!! That is great info! Appreciate it....

MidnightBlue5.0

I have 3.73's and sadly.. I want 4.10's.

ToplessGT

midnight,
I guess it all just depends on how far it is to work or not.... cruising 85mph daily would keep me at the pump twice a week with 4.10's, I actually think 3.73 are a little much for my daily driving, but I figured 3.55 and 3.73 are too close together, so take the 3.73s. I think it honestly depends on driving habits and the gas pump....

rbstang

4.10s but you might want to look into 4.30s... between the 4.10s and 4.30s is only a 100rpm but 4.30s will definanlty wake your car up. Its worth looking into.

YNotch?

Great Info Guys!, at this point I am not shure what tires I will be running. I am still deciding what way I want to go with the car, make it e 1/4 mile burner with big and little Welds, or a good ground pounder that corners well and some 17's or 18's.

I do have a set of tires that I am installing on the stock 16" wheels for now but I need to see how tall they are.

FullAuto, What RPM's were you turning at the end of the 1/4 mile? is your motor stock or built? what size tires were you running?

That is a good way to look at if you are building a strip car.

FullAuto

It was a 26x8 tire. The motor was a stock 148k shortblock with ported E7s and a Bennett custom cam. It had a Performer RPM intake, 75mm MAF, 70mm TB, UD pulleys, BBK shorty headers, O/R H-pipe and 4.10s. So it had some bolt ons, but not exactly "built". The car was a full weight LX hatch with a/c and p/s. I was also spraying it down with a NX wet kit pretty heavily. I've always been an aggressive nitrous guy. It had ran 11.87 @ 115.8mph on a smaller shot. When I hit the rev limiter I coasted to a 11.65 @ 115.8mph but I had 4mph more in the 1/8 than the slower pass. So it was on a good run. I believe I had the MSD chipped at 6k so I wouldn't hit the factory rev limiter (cuts fuel) on the nitrous.