I was wondering wouldn't a higher FD complement a turbo that makes its power up top? I've heard that a lower FD and boost are ideal because it allows time for te turbo to spool.....however, for a top end turbo, wouldn't a higher FD complement the narrow powerband of the turbo by allowing you to stay in the upper end of the rpm range when shifting at redline?

 

i wonder if anyone is ever going to help you out i would if i could but i cant so i wont.

is a moron

 

Almost had it.
You need to be able to spend more time in gear because of the additional spool time, therefore you'd want either wider gear spacing or a lower final drive.

However, if you had a dinky turbo that couldn't flow at redline, then you might be OK with a higher FD.

 

spool isn't that big of an issue

traction is

 

you want longer gears ONLY if you want to increase your overall top speed. for 1/4 mile type racing, you want short gears. wanting to stay in boost longer in a single gear is a myth. depending on your tire size, along with your gears/final drive, in our cars with oem type tranny, you want to go throught the traps at the top of your powerband in 4th gear. i had a b18c1, 9800 rev limit, 25" slicks, 500+ hsp to the wheels, and i ran a straight b16 tranny w/quaiffe. shorter is better.

or just do a search in the forced induction forum.

 

bingo.

 

I stand corrected.

 

You also added almost 2000rpms to each gear...

the b16tranny + an extra 1800rpm + 25" slicks = what max mph in each gear?

Im not doubting your knowledge or anything, you know a hell of alot about building a fast honda drag car that are still streetable, if what you are saying is universally true then why do the pro's run extremely long gears? Ex: Papadakis' h22a shifts twice and traps at 180mph

 

uhm, because he has lots of torque and HP?

same rule applies.

basically if you have lets say, oh 1000 whp in a fwd car, expect not to get any traction ever under full throttle.


[Modified by Soup ****, 3:15 AM 12/8/2002]

 

You want to have either as high as a final drive as possible to get you down the track within your gears and still maintain traction the whole time...or enough boost with whatever final drive you have to maintain traction....but only barely in both cases. If you are at the limit of your traction the whole time...then you know you can't go any faster than that.

 

papadakis uses a 2 speed tranny( i believe) and it is far from oem. i used that term(oem) in my explaination so that we could seperate the two. my knowledge comes strictly from my own experiences with oem honda trannys and other people that i am close with. i mean, lets face it, we'd all rather have a 2 or 3 speed automatic in drag racing like papadakis, but that just isn't going to happen.

i raised my rev limit to 9800 and that allowed for me to go through the traps in 4th. i also was launching at 8000. so for the aveage honda/acura street car, launching on street tires @ under 4000, turbo or NA, short gears are best. for instance, if we had identicle cars, turbo, etc..., and we raced launching exactly the same and i had shorter gears than you, i would pull harder/faster. this is not a new debate. about 3 years ago using an LS tranny was common for boost. now a days, thats ancient history. come over to the forced induction forum and do a search.

2 years ago, my street car had a custom turbo kit, b18c1, gsr tranny, 8100 rev limit, and 15 inch tires. i never had problems getting through the traps in 4th. traction is always an issue, especially in the first 2 gears. thats why you concentrate on your suspension to try to get the power to the ground, not by adding longer gearing. the only thing i would have changed on that old set up is adding a 8500 rev limit and a b16/type r tranny. with your type r's already having a higher rev limit and short gearing, your almost there.


all i can say is that the 2 fastest street hondas in the world run short gears with either slicks or street tires.