minytrker

iTrader: (13)

Im working on a 99 z28. Cam only, a3 w/brake, 4.30 gears 28 tire and gas. What stall would be best, shift at 6800-6900rpm. I would like to leave on 150 shot, maybe 200 shot and run a total of maybe 300 or so with a second stage. Also would this setup work for the 1/4? I keep getting mixed anwsers on if it will run out of rpm for the 1/4. The car is being built for mostly 1/8 mile and some 1/4mile.

Pro Stock John

iTrader: (34)

28" tire + 4.30 gear + A3 + shift at 6800 + 300 shot sounds like it won't work. That would be too much gear.

minytrker

iTrader: (13)

Thats what Im thinking. Would 4.10's work or do I need to go with 3.90's.

Pro Stock John

iTrader: (34)

Let's get a little more background info first......

What raceweight?
How fast do you think you will be on motor?
How fast do you want the car to go on a 300 shot?

ApacheDrill

iTrader: (21)

4.10's have me pretty close to that

Pro Stock John

iTrader: (34)

Have you close to what?

ApacheDrill

iTrader: (21)

the RPM shift point he is trying to get at with a 3800 stall and 4.10s spraying

minytrker

iTrader: (13)

raceweight is 3650 but should be 3100-3300 really soon
On motor high 10's
on gas mid to high 9's

Pro Stock John

iTrader: (34)

My Camaro (in sig) is 3300 with me, 4.10 gears, 28x10.5's, Fuddle 8", 150 shot NX wet, shifting at 6800.

Went 10.92 NA, and 10.00 on a 150 shot back to back yesterday. I don't think you will get away with 4.30's, and I could not spray anymore on top of the 150 unless I either went with a tighter converter or down to a 3.70 gear. With a 3.70 gear I could spray 250 and run mid 9's.

minytrker

iTrader: (13)

Thanks that helps alot. Whats your stall speed? Here we race way more 1/8 vs 1/4 so the 1/8 mile time is more important but it would be a big plus to be able to make through the 1/4. Do you think 3.90's on a 300 shot would make through the 1/4?
Now knowing this is more for a 1/8 car what do recommend? Should I just give up on 1/4?

chrismorales75

If you run out of rpm you can always run a taller tire.

Pro Stock John

iTrader: (34)

It's like a 4800 stall. I would not run more than a 3.90 gear if you want to finish the 1/4 on 28's.

bowtierodder

iTrader: (3)

what about th400, 6600 shift point, 150 shot, vig 3600, made 424 n/a , it has 28's on now but I can switch to 30's if need be? and race weight 3280 w/o me in it. sorry for

chrismorales75

2" taller tire "in theory" would be about 10 more mph at the same rpm.

bowtierodder

iTrader: (3)

thanks, thats something to think about

Pro Stock John

iTrader: (34)

30's look kinda crazy on our cars, you have to cut the sheet metal unless you are minitubbed.

I made about the same power on motor thru the T400 FWIW. You can run the 4.10's and probably go 135-138mph before you run out of gear. I went almost 134mph and I might have gone a bit faster if I had shifted a little lower but didn't have time to mess around.

With my turbo car I am going 144mph with 3.50's and 28's, with room to spare, I could go 165mph potentially with the 3.50's assuming 7100 rpms.

minytrker

iTrader: (13)

I think I have a set of 3.90's laying around the shop. I will try those first since I don't have 4.10's. Do you thinks the 4.10's would help it more in the 1/8? I could probly spin the car to 7,000 if I had to to make through the 1/4.

Pro Stock John

iTrader: (34)

4.10's would work a little better than 3.90 for when you are on motor, but at some point you have to pick n20 performance over motor performance. Personally I have two cars that are quick so I want the Camaro to run mid to low 10's on motor for a while. But I'll keep spray on the car.

minytrker

iTrader: (13)

I would rather it run better on the bottle over motor hands down in this car.

Pro Stock John

iTrader: (34)

For a 300 shot I'd run 3.70's or 3.90's.

I'd probably try the 3.90's if I had 'em lying around.