Swift_01_z-28

iTrader: (1)

Ok, my z is my daily driver. I have already gotten the bolt-ons, and am now looking at what to do next. The problem I am having, is the fact that I am not ready to replace the 10-bolt yet, or push anything to the point of failing on me and being without a car for a while.

I am considering going with some 3.42 gears, seeing as how I have the 2.73s, and also a 3200 stall. I figured that would put my car strong into the 12's, and still be reliable.

I am thinking about making it a cam-only street car, but I am pretty sure that a cam will push my poor 10-bolt with the drag radials to its limits. What do you guys think? What would be a good setup for me? I'm trying to keep the gas mileage decent, that's why I said 3.42s.

gold98Z28

iTrader: (7)

a stock 10 bolt will hold pretty decent with an auto car. ive pushed them well into the 10's reliably with big cam, big stall nos car. but kill them instantly with a stick car. they cant take the shock load of a heavy clutch. IF you change the gears, it HAS to be set up right to hold up. with a solid pinion spacer and plenty of side bearing preload i have good service out of them in auto cars tho.

i have a set of gm 3.42's cheap if you are interested. the threads got damaged on the pinion laying around for so long but i repaired them and will make you a nice deal if you would like. will email a detailed pic of threads if you are interested

gold98Z28

iTrader: (7)

oh and a good stall will make the biggest differance in you car. but will suffice a little mpg in town

fccs

iTrader: (26)

Gears and cam, go with something like 3.73s, thats what most a4 people do. And then do the stall with the cam.

gold98Z28

iTrader: (7)

oh and id be more concernd with the stock tranny taking a poop on you. its subject to happen even on stock hp....lol

Swift_01_z-28

iTrader: (1)

Yeah i know the tranny isn't great, I see them go out all the damn time lol.

therobman

iTrader: (39)

yea dont be worried about ur rear it will handle it on an auto

RaggedRides

iTrader: (8)

Why a 3200 in particular?

FlashLCD33

iTrader: (8)

Well I've been in your shoes. A couple of my experiences -

I wouldn't go with less than 3.73s in an auto. You may think you'll lose mileage, but not near as much as you'd think. I literally just logged 25.5-26mpg on my way back from my dyno tune at texas speed. Not bad for a cammed, stalled, geared A4.

I wouldn't waste time with a 3200 stall. A friend of mine went with a 3600 and it is almost like stock. I have a 4000, and it is PERFECT. You will lose the most gas mileage going with a stall compared to anything else, though.

Stock trans should hold with a good cooler.

10 bolt will GENERALLY not hold. I just killed mine after 50+ 1.69-1.75 on nitto DRs with my cammed/stalled car.

Swift_01_z-28

iTrader: (1)

Well guys here was my original intention. 3.73 gears, a vig 3600 stall and a tsp 228 cam. I figured I would lose some mileage with the 3.73s, but a little less with 3.42s and the difference between the two is supposed to be very small. What if I just did that stall those gears, what do ya'll think of that?

Badguy7

iTrader: (6)

Im not trying to hijack your thread but im in the same position as you are. Im thinking of goin with a 3600 stall, 3.73 gear's and then getting a tune. I really dont plan on a Cam anytime soon. How would the tranny/rear end hold up with this setup???

Also, since there's not much of a difference between the 3.42's & 3.73's. Why not just go with the 3.73's Swift_01_Z28? I dont think mileage should be hurt very much.

therobman

iTrader: (39)

id do 373's the diffrece between those and 3.42 is tiny. flash the only way i could see you doing those mpg numbers if u did 50mph the hole way home. i have 3.73's and had a stalled about 4k. i did a t56 swap i dont even see those numbers with my t56 at 70 with 3.73's im 700 rpms less then an auto would be so i think your numbers are a little off

PhantomR/T

iTrader: (6)

what kind of highway RPM do you 3.73 guys have at like 75mph? With a 3800 stall if possible

therobman

iTrader: (39)

stall wont effect your rpms on the high way once a stall locks thats it so if you have a 2000 stall and then put a 4000 stall ur rpms will be the same on the high way its ur rear gears that effect that. at 75 an auto with 3.73's turns about 2600rpms

joker machine

I would talk to Yank Racing Converters. They know what gears and stall you will need, depending on you're hp and tire size. Matching parts equal better ETs.

RPM WS6

iTrader: (3)

You won't break a healthy 10 bolt at that level with an A4 so long as you don't have wheel hop.

The trans is more likely to break first.

9000th01ss

iTrader: (10)

My '01 Z28 runs 12.3 at 110 all stock with 3.23's exhaust, lid, 3600 converter, slicks, my tuning.

IMO the converter kills your city MPG and the gears kills your highway MPG.

FWIW the guy that had the car before me was running 6.4 and lower in the 1/8 with the same rear, stock trans, yank pt4400. He blew the engine up with nitrous and I bought it as a roller.

WS6R6

iTrader: (1)

His numbers are definitely not off by any means! We were doing ~70 the entire way with a little messing around as well and in my M6/(231/237)/3.90's I was getting 29mpg which is ~1-2 less than I was getting without the cam, and this is on 3.90s both times!

9000th01ss

iTrader: (10)

My other car is an M6 with 3.73's. I've seen 27 avg mpg on a 1100 mile trip.
I've also seen 24 with the same car, you have to leave it in 6th and not move the gas pedal, when I got 24 it was because I felt the car was lugging and kept going from 6th to 5th and back. When I got 27 it felt like it was lugging but apparently not.

therobman

iTrader: (39)

i guess i just like to play to often lol i get 14-16 around town and thats with a pretty heavy foot is that normal?