91RS5spd

I have a 91 RS 5spd and Ive never taken it out to the track and have no idea how to launch off the line I tried twice, once I stalled and made and *** of my self and the second time I just burnt out big time Any help would be nice befor I go to the track and make an *** out of my self a second time.

Tom84L69

do you have an open or posi rearend? what kind of tires are you on? a good launch for my car with 3.73 posi and 255/60/15 tires is about 2500 rpms. don't just sidestep the clutch, keep your foot on the pedal and engage it quickly.

Matt

At what RPM would be best to shift at with a 305 and 373 one leg rear end on 15in wheels?

Tom84L69

3.73 open? did you buy that? you don't come across many open 3.73s. i'd say experiment with about 2000 rpms to start and work from there, every car is different and so are the drivers so experimentation is necessary. remember, t5s and stock 10 bolts are weak and the less shock loading you apply, the longer the driveline will live.

Matt

No I did not buy it it came with the car when i bought it. the build sheet says 373 but when i stomp on the gas i leave one track. Could the posi be broken? Did posi come with drum brakes b/c that is what I have?

Tom84L69

i don't think they ever built non posi 3.73s. you may want to search previous posts to find out for sure. the posi in 7.5 inch 10 bolts is a gov lock system and they do break easily so i guess that could be the reason.

BadBird84

I put my toe on tha clutch, heel on the brake and get the RPM's to whatever works for you, mine is around 2000 i think

Tom84L69

that's on aodd way to launch badbird. why do you need the brake? unless you were not on level ground, there is no need to have your foot on the brake.

MattW

iTrader: (1)

my 84 TA HOe is a one legged wonder

i heard that most of them are that have 3.73's

NSR

There were non-Posi 3.73's in F-bodies from 1983 - 1986.

Axle Codes

1983
- 4JK
- 5JK
- 5KM

1984
- 6JK
- 6PM

1985
- 8JD
- 8KB

1986
- 2HC
- 2HM

These are all 3.73 STD Rearends.

irocbarry

my 85 has a non posi 3.73 rear
axle code GT4

BillZ28

You sure the GT4 is non-posi? That's what I have in my 84 Z28 and I was under the impression it was.

NSR

GT4 is an RPO code for 3.73 gears, used from '78-'88. It is for both Posi and non-Posi rearends.

ChillPhatCat

I will contribute to the drifting topic... next time your rear tires are in the air, turn one tire, if the other turns in the same direction you have posi... if they turn in opposite directions it is either one tire fire or a broken posi.