88greyiroc

ok this guy owns a 1993 mustang gt its done up goin 40mph he kicks it down and it chirps hard and then goes how can his gears be 3.08's if he is doin that and how can i beat him?he can run with a 1998 cobra and i own a 1988 iroc-z 350 tpi with 30,000miles.i pull hard but i only have 2.77 it takes a long time to go fast compared to his 3.08's or so he says.

Mark A Shields

Get headers and some 3:42s.

IROCZTWENTYGR8

iTrader: (1)

He's not telling you everything. You should have won, but seriously get some better gears, 3.42's, you will like it so much more and so will your car.

88greyiroc

how much of a difference will 3.42s make in my car?i don't really understand how it can make such a difference.Right now i run about 13.9-14.2 how much of a difference would the gears make?

Mark A Shields

You'll knock off around .4-.6 in the 1/4.

tpivette89

that much from gears alone? wow. then i should gain ALOT if i plan on upgrading to 3.54s from my Vettes stock 2.59s. i figured a few tenths, not a full half second or more

Mark A Shields

2:59s, wow that's $hitty.

IROCZTWENTYGR8

iTrader: (1)

2.77's to 3.42's equals nice amount of difference.

xxwarrior36xx

sorry I am not trying to instigate here but why wouldn't you get 3.73' Everyone always says 3.42's and I was just wondering the major signifigance of this gearing. If you are going to do it why not put in a 3.73..just wondering

85transamtpi

I'd say 3.42's would be the best bet for and LTR intake car. To tpi tends to make its power down low, and with 3.73's you'll end up going through the traps with the motor OUT of its powerband. Ive seen people who swap for 3.73's see NO gain, and loose gas mileage and driveability. I wouldnt count on .4 second gains, but they are definetly possible. You'll be amazed at how much better you'll do in stoplight to stoplight situations after the gear swap. It will wake up your car and make it feel a hell of a lot faster.

-Doug

Mark A Shields

EXACTLY, and one of those morons is me. I didn't realize the importance of matching your gears to your powerband. I went from 2:73 to 3:73 posi and didn't gain anything. but once I get a cam swap I'll be set.

Nic

What're his other mods? I used to be able to light the tires up from a 45 mph roll in my convertible with not much more than gears, a converter, and exhaust w/stock headers.

Mustang5L5

Hell, when i was stock other than 3.73's i could get a nice healthy chirp on the 3-1 kickdown with my car.

IROCZTWENTYGR8

iTrader: (1)

Yup, 3.42's are the best gear for a TPI car, even 3.27's are good.

5.0mustang

Me too 5L5, I wasn't expecting it the first time and it caught me off gaurd, almost thought I did something wrong!!!

Shagwell

I don't know about the rest of you but mine rips 3rd lose when it shifts. It plants hard for take offs(1.94 60ft), but I'm definitely out of motor by 5000. I'm currently running a basically stock 350 TPI with stock limited slip and 3.27's. When i jerk the shifter back and plant my foot in it it blows a puff of smoke around 45-50. And I'm not talking exhaust...

CHEVY_EATER

When I was still auto and kicked it down I broke loose bad..spinning..then chirped into 2nd..with the stock 3.27's . Even when my car was 100% stock..I could chirp into 2nd with suto.....or punch it down and chirp. I know a kid with a lightly modded 88 LX that is auto with 2.73..he can chirp on kickdown too. If he has 3.08's he must be standard..the are not available with auto...only 2.73's ot 3.27's with auto. It is easy to chirp with 5spd. Before I put Nitto's on I chirped in even in 4th..now spin in 1st..chirp 2nd..chirp 3rd..

trans87

Can you downshift to 1st or 2nd gear from 4th? I would of thought that would break the tranny? I mean what is 1st gears max speed? Wouldn't downshifting that low slow your car down? I never knew that this could be done. Please enlighten me on how this works.

vortecfcar

while we're all sharing our lack of traction stories I guess Ill say that the first time I hit the nitrous in second gear at around 40 I SMOKED the tires without a downshift... it gets squirrly with the DRs on, but street tires are downright absurd.

I guess its cool to see smoke the tires at highway speed (by the time they stopped smoking). But Id rather be tossed in my seat with the tires hooked

Nic

Depending on gearing, matting the throttle in 4th at ~ 40 mph will put you in 2nd gear right into sweet spot of the torque curve in a 5.0 HO motor. You really ought to drop it down into D before doing it though.

With 3.45's and a 6200 rpm rev limit, I usually shift into second about 40-45 mph and then 3rd right around 85 mph according the stock speedo.

CHEVY_EATER

Not is a mustang?? Unless it has 7.5 rear?? Only can get 3.55's with 8.8 that is in all the 86 up 5.0's.....

Nic

My car was a former 4 cyl 5 speed car, thus the 7.5" rear with 3.45's. It's coming out in favor of an 8.8" with 4.10's very soon.

91drag

dont you know mustangs always wins. try 3go out its better

25thmustang

Welcome to 2002, I had a diff screen name back then and everything!

IROCThe5.7L

Stop bringing up old posts and replying with useless information.

Rossi

Yep. Like someone else said, shifting from cruising rpm in 4th down to 2nd should put you right in the sweet spot. If your in a manual then double clutching can be done swiftly and lead to a fairly smooth shift, even when droping 2 gears. If your in an automatic then shifting to 3rd and then 2nd would be advisable. Either way its not gonna feel like floating on a cloud, and it will slow your car down if you take your foot of the gas.

Mustang5L5

Wow, i haven't been here in forever

Rossi

Didn't even realize it was a necro till i saw this post.

89IrocZ350TPI

Going from 2.77's to 3.42's will bring down your 1/4 by around .3.

89Nighthawk

Put some money into your suspension so you plant and go! Gears will help, but make sure you match everything.

rx7speed

25thmustang what was your other name by chance?

find it funny though everyone is saying how this is a thread from 2002 and yet everyone is also trying to answer the original posters question

86redIROC

There is something seriously wrong if you gained nothing from going from 2.73 to 3.73's. You should get a noticable improvement in ET's. Makes no sense at all.

25thmustang

5.0mustang and I also had 89mustang! Had 1530 posts on one name apparently, and maybe a few hundred on my first name!

rx7speed

except for when you go out of your powerband and stay there.

if your car like most tpi cars makes power up to about 4000rpms and then takes a nose dive that is worse then hitting the brakes and change gears to where you stay from about 3800rpms-5500rpms then you not making as much power as you might from 2800rpms-4500rpms.