short or long tranny better ?
 

as i know the short tranny + turbo is better for acceleration. and i hear some friend say the long tranny better after 400 hp.

any explan will be great

Re: short or long tranny better ?
 

gearing/tire size/powerband/torque curve/rev limiter in each gear








come up with that and a solid answer is in your pocket

Re: short or long tranny better ?
 

really i undestand nothing.

do you need me to divide all these values then get the answer ?

Re: short or long tranny better ?
 

no.

if you are going to be driving at 65 and under , short will be more fun. for frequent highway trips, higher mpg at faster speeds, and wrapping around of the speedo, go with the longer(lower) gears

taller tires need a higher gear, same with peaky powerbands, and 5 million rpm rev limits

torque and high power cars will be better with longer gears.

Re: short or long tranny better ?
 

i am running a LOOOONG accord tranny on my prelude and i love it. it's a lot of fun to be able to downshift in 3rd at highway speeds and the second gear finally doesn't feel like a 1st gear anymore.
in my book, stretching the gears just makes sense when you add 100% or more HP to a car.

Re: short or long tranny better ?
 

what about a hybrid like an si tranny with a dx 4th and 5th or something? i dont know what the gears are in either but seems better then having the whole tranny geared long.

Re: short or long tranny better ?
 

Thought of that, MistaBone is champ on the D-Series trannies and as he stated the 5th gear in EX and DX trannies are the same. Also, you can't go B to D gears saaaaaaay, like LS 3rd for your EX 4th gear, just won't work.


In your case, shorter gears. I really don't like the long gear myth at all. Unless you're taping the rev limiter in 5th then you're gears are fine.


JP

JP

Re: short or long tranny better ?
 

I have always wondered this too, I have a d15b7 tranny and a z6 tranny, not sure which one I will use yet, my hp goal is 350 on my z6. I have tall tires so I figured I'll use the 93 z6 transmission.

Re: short or long tranny better ?
 

Shut up your an idiot, your book is wrong. You also made some stupid comments on another thread I noticed.

Re: short or long tranny better ?
 

That Pink's All Out CRX runs LS gearing, with 500WHP on tap I def. wouldn't want a B16 tranny, you just wind up running giant ass slicks. It's like the guys on H-T saying the new M&H tire hooks really well now, no ---- it's a giant ------- tire that just turned your B16 tranny into an LS.

Re: short or long tranny better ?
 

It basicly boils down to this...if you run n/a, get a short geared tranny. Running boost, get a longer gear. Nothing sucks more than trying to shift through 2 gears of wheel spin on a boosted setup while in traffic.

Re: short or long tranny better ?
 

Boils down to power and weigh of car.

Re: short or long tranny better ?
 

It boils down to more things than that. Saying short gears for N/A and long gears for boost it just retarded and bad advice. You can make any tranny work with the right combo of parts (tire size, traction, power, redline, street, stripp, etc... it all plays a role, just depends on what your setup is). What you don't want to do is get a long geared tranny because you can't get traction, you should get better suspension, better tires, staged boost control, a limited slip, etc... If you have a high revving vtec motor your going to want short gears to stay up in the powerband.

This guy wants to know what to do for 400+ whp, which means this will probably be for the track and decent size slicks. Let's say he has 400whp, 8500rpm redline, and 25 inch slicks. An LS tranny will top out in 4th gear at 153ph, he sure as hell isn't going to be trapping that. With a B16 tranny he will be topping out 4th at 130mph, that's going to work out a lot better for him.

http://forums.evans-tuning.com/viewtopic.php?t=1496

Here's a gearing calculator... http://www.autocrossing.com/cgi-bin/gearcalc.cgi

All that said... shorter gears > longer gears

Re: short or long tranny better ?
 

That too. I pretty much gave him the extremely dumbed down answer. :1

As for BBKA...you make a good point. Everything you posted is great info if you plan on doing an all out track car. If it's street driven, then it just gets to be a pita. I have an S1 trans on my b16 right now, and everyone told me the same thing you just did...gotta have a shorter geared trans so when you shift you can still keep it in vtec range. And that s1 always does keep me above 4600rpm when I shift. I tried a ys1 trans and it was alot of fun on the street in n/a form, but once I turbo'd the motor I absolutely hated it. Granted the lsd was nice (next thing on the list for the s1 trans), but the close gearing sucked...all wheel spin up through 3rd gear even with a 17" wheel and a decent set of tires. My 15" wheels with road race m/t's were even worse.
Here's another factor that will play in as well...spool time. My turbo hits threshold at 3k, so I want the longer gearing. Most bigger turbo setups that take longer to reach that threshold would want the shorter geared tranny. Honestly it's too vague of a question to give a definate answer on, but seeing who the poster of the thread is that really doesn't suprise me. :P

Re: short or long tranny better ?
 

my b16 tranny with 205/55/14 tires tapped out pretty close to 112-115mph with a 8500 rev limit. not sure what it would tap out with some decent slicks. but i wouldnt mind trying a ls tranny especially if i had something bigger then my b16.

Re: short or long tranny better ?
 

short>long you race two of the same car with the same power the one with the shorter gears is going to win everytime from a dig

Re: short or long tranny better ?
 

That car has suspension, slicks, staged boost control, I assume a limited slip and a high revving (9500RPM) VTEC engine. Runs LS gearbox, and normal sized slicks, runs 10s.

Re: short or long tranny better ?
 

9500rpms and 24.5 slicks with an LS tranny will top out in 4th gear at 168mph, so that combo sure doesn't make any sense to me when your just looking at the math. If he had b16 gearing he would be topping out 4th at 142mph which would work pretty well for 600whp (The ross-mobile was around that much power and trapped 140mph right?). Although the weight of the car you mentioned is a lot less than a 4 door eg, so it's going to trap more.

Like I said in my previous post it's going to be different on every setup and you could change a lot of things to make the LS tranny or B16 tranny work. Go back and read that thread I posted, mostly the comments from Jeff and Earl, Jeff explains the math part very well and Earl talks about going between a B16 tranny and LS tranny without much difference in times and they have used 22-28 inch slicks (doesn't get too specific though). Gear spacing of the tranny and your powerband is also a big part of it. Somebody that has a very short high powerband would hate long gears, dropping out of boost will kill your times. Then again if you have a bigger powerband you might be better suited for longer gears, just depends on your setup.

Since were quoting people, here's a quote from the evans thread I posted... "For whats it worth, ever SFWD car that i have seen running in the 9's is using the SI tranny, or SI gearing"

Oh and we all know JD has a thing for LS motors and tranny's, he would marry and LS swap if he could. :P

Re: short or long tranny better ?
 

Yeah, but it's not Joey's car so there's a little less bias.

I agree with you on some points and not on others, I think you can make either gear box work for whatever setup you choose to run, it's just a question of matching the rest of the components together.

I have always been of the opinion that if you have the power to push the long gear, take it, as it will make a much more enjoyable car to drive on the street. I know the math looks dumb, but fighting to get traction in the first 3 gears is enough for me to stick with longer gears. And if you take it to the track, run a smaller slick than normal to cancel it out.

Re: short or long tranny better ?
 

BBKA, I is transmaster so the simple gearing factors you presented.

Re: short or long tranny better ?
 

Even with longer gears, 400+whp on the street would be useless in the first 3 gears. To run decent on the street your defintely going to have to lower the boost or use some kind of staged boost control (200whp 1st, 250whp 2nd, 300whp 3rd, 350+ 4th, etc...). Without my drag radials my car spins 1st and 2nd gear easily and I am around 215whp with a quaife lsd and decent suspesion, so with twice that much power? Haha good luck. Maybe Josh Ross could chime in since I know he would have some good input on the subject of a high horsepower steet/strip honda.

Re: short or long tranny better ?
 

using VSS input vs RPM for gear dependent boost......

5-6 psi in first, 7-10psi in second, 9-15 in thrid, 4th = ALL OUT BITCHES!!!!!!