What would be the best all around gear and stall in this C5 corvette. built 4l60e A4? Would like to beat one of those monster supras on the highway.
What would be the Ideal racing rpm range based on this chart?
4000 to 6500 rpm?
4500 to 6000 rpm?
2.73 or 3.42?
Torque plays a huge part in this one.
This not my car, but if I could get enough feedback this could be my ideal setup.
http://www.kennebell.net/supercharge...raph_05_06.gif

 

http://www.kennebell.net/supercharge...raph_05_06.gif

 

i vote 3.42 wont kill you down low and you can hit second hard from 80-100 and pull 3rd to 160-170

 

http://www.kennebell.net/supercharge...raph_05_06.gif
How does the torque factor in? 2.73 3.42 HWY

 

I absolutely love my 3.73 A4 combo on the highway. 3rd gear is a monster from 70mph up.......but I only have 330 hp. Also 3rd gear only goes to about 110 mph, and I don't think you want to shift to overdrive at WOT unless your tranny builder says it's okay.

In a lightweight Vette with 800hp/800ft-lbs I would do 3.15's so you're not spinning the tires from a 80mph roll!!

 

Actually 3rd will only go to 130mph @ 6000K and 145mph @ 6500K w/ 3.42's. Then your stuck cuz 4th don't like WOT!
I'd go 3.15's w/ that much power if you wanna go above 150mph. (160mph @ 6500rpm)
How high will the car be revving should actually be the big question. Use this to see what you will be at and where the shift point will be and what the rpm drop will be for a shift. http://www.f-body.org/gears/

 

thats alot of torque down low! with that much torque i would prefer a stall a little higher then stock. depending on the tc company i would guess a 2000 stall on slicks would actually flash around 2500 or so. for more of a race only car i would go with a 3000rpm stall to get near the torque peak. i would also go way tall on the gear, like the 2.73, to make good use of all that torque and to give you that big time top end speed. though the taller gear will cause that tc to stall at a higher rpm.

 

Talk to AmericanHP since that is his car.... he has a M6 if i remember correctly.

 

3.42s i have 4.10s in my A4 SS but its not even close to that kinda power im only around the 400 rwhp mark

 

Sent a PM to AMERICAN_HP. He was Beyond helpful, really knows his stuff. He not only helped me out on gear selection, but sent me a list of internals that would work with the setup. He said that the 3.15 might be the best gear.
Now I would like to know why would 3.15 be the best.
http://www.kennebell.net/supercharge...raph_05_06.gif

 

Geez only 4 of us were right?! It is the best gearing for that application because of the intended purpose.
If you were o need a Drag strip only car i would go 3.42's. Being an F.I. car you want the gearing on the longer side so that ht e car is able to be under boost for a longer amoung of time. That roque curve will carry that car easily with a longer gear. If you look at the link i posted and compare the sets of gearing to the power band you posted and factor in the intended use, the 3.15's seem to be the logical choice.

Racing on the highway with that kind of power w/ poopras....I mean supras (haha) you will reach ungodly speeds in an insane amount of time. All (most) supras are, are top-end cars.
Like i stated before if you stick w/ the rev range posted and go with 3.42's u will top out at 135mph in third gear, as 4th gear WOT pulls are a no-no. Use the boost to carry you witht he longer gearing.

If you want to compare gearing with a supra tranny here are their specs. Now factor in their power output and u'll see what i mean.

6 Speed Manual

Final Drive 3.27:1
1st Gear Ratio 3.83:1
2nd Gear Ratio 2.36:1
3rd Gear Ratio 1.69:1
4th Gear Ratio 1.31:1
5th Gear Ratio 1:1
6th Gear Ratio 0.79:1

Here are their specs. http://www.supercarsite.net/toyota/supra-turbo/1998

 

So with all of that torque available at 2000, would it be benificial to land lower in the rpm range on every gear shift? Makes more hp up top but much less torque. Say shifting from 2nd to 3rd would it make more sense for the rpms to drop to 5000 because of HP, or should the rpms drop closer to 4000 max torque?

 

3500-4500 is a good range to shoot for if you go 6500rpm limit. With all that power you want the engine to be in the meat of the power as long as possible. All the shift drops will be in the same general area unless you change the gear ratio itself. (see examples)

With 3.15's the gear drop on shift will be:
1-2 shift @ 51mph to 3500rpm in second
2-3 shift @ 97mph to 4000rpm in third
3-4 shift @ 158mph to 4500rpm in 4th, then carrying to 225mph @ 6500rpm.

Same thing with 3.42's
1-2 @ 42mph drop to 3400rpm in second
2-3 @ 90mph drop to 4000rpm in third
3-4 @ 145mph drop to 4500rpm in fourth, then carry to 207mph @ 6500rpm.

If you could build the trans to run WOT in 4th you could go with a larger gear set. Then you would be able to utilize the last gear and see higher mph quicker in the top end.

I would still go with the 3.15's personnaly though.

 

Excuse the ignorance but , why can't we run wot in 4th?

 

Materials are not strong enough.

 

with a stall he won't have to worry about the shift drop offs.

 

with soo much torque available at the lower rpms i'd want the shifts to drop,,,right?????