LANDONZ

iTrader: (23)

Hey Guys,
I have a 2002 Z28 A4 with a lid and magnaflow exhaust. I recently ran a 13.7 at 105 with a 2.4 60ft. Horrible I should say..Anyway, I have 2.73 gears at the moment, Its a daily driver, so would 3.42 gears be good? What kind of changes would I see with 3.42 and a Predator Tune.?? I was wanting 3.73 but I dont want 2500 Rpm at 70 right now. what do you think?

BLK02Z06

iTrader: (1)

Well 3.42's would help but I'm not sure of how much... My first time to the track with nothing more than a lid and a single chamber flowmaster in the place of the stock muffler and 2.73's I went a 13.49 with a 2.29 60 ft. @ 105.43 mph. The track was not prepped very well, went to another track (1/8th mile) the next weekend and was cutting 2.02 and 2.03 60 fts. and ran a 8.48 @ 86.34 mph. Which should equate to about a 13.1 + or - a little in the quarter. I would try working on the 60 ft... With a 2.0 to 2.1 60, you should go low 13's all day. And going to a 3.42 I think you may only pick up a tenth, maybe two at the most. I'm planning on keeping my 2.73's and installing a convertor real soon. People are typically seeing a .4 to .6 reduction in 1/4 mile times. Plus the 2.73's are stonger, and will give you better gas mileage. But I guess it could all depend on your future mods and what you want to do.

toxic99

Do stall and tires first, then gears.

99ss00ws6

If its just a daily driver and to the track every now and again I would say get the 3.42's. But if you are thinking of a cam later down the road go with the stall.

RevGTO

iTrader: (12)

Agree. I went from 2.73s to 3.42s primarily for around town driveability - and I love the difference. Your traction problems at the track only get worse with the lower gears (and even more so with a stall).

Scotty-Z

iTrader: (5)

I'm also thinking of doing the 2.73 to 3.42 swap. Does it pull considerably harder throughout the rev range with the 3.42s?

ULTIMATEORANGESS

iTrader: (4)

i know you have 2.73s but when i went from 3.23s to 3.73s i only rev about 400 RPMs higher in OD which isnt bad.



if i was you id work on getting better traction before adding anymore mods.




try some nittos.

RevGTO

iTrader: (12)

Yes, quite a bit ... the car is much more satisfying to drive. But if my car had 3.23s like my LT1 Formula did, I would have stuck with those. The only time I liked the 2.73s was at 80mph+ on the freeway.

rotwiler

iTrader: (1)

I have a 02 A4 with the same mods as yours. Magnaflow CB, Predator Tune and K&N FIPK(had a lid and K&N filter before) but never changed my times switching. My best run with 2:73's was 13.54 on a cool day. My typical run was 13.6. With just the swap from 2:73's to 3:42's I ran a best of 13.15 on a warm day. On 80+ temp days all summer I ran 13.2's and doesn't vary like it used to, before I'd run a 13.6 and a 13.7, now I'll run 13.22, 13.23, 13.24. My 60 foot times with the 2:73's were 2.2's and sometimes on a good day I'd get a 2.150. Now I run 1.94's all day long, lower my air in the street tires to 26psi and punch the gas at the 3rd yellow on the tree. So I gained a 3 to 4/10ths gain just from the 3:42's. Traction is slightly worse and but not bad and overall I am very satisfied. Highway driving is around 2,200 rpms and gas mileage changed very little. I'd say get them, everyone said to me get 3:73's, but my concern was same as yours, also, then I'd have traction issues at the track.

ty_ty13

iTrader: (42)

gas milage and performance dont go together... pick which one u want...im doing 4.10's and a 12 bolt in the next 2 weeks...gas milage will suck, but will have a way better hole shot with some M/T drag radials...go fast or go home just IMO.

either way the lower the gear (higher number) the more fun it is. id say at least do 3.37's.

HAVE FUN!!