TNTaddict

347 ci forged -2 cc,T-rex,pp stage II, 12:1 comp, Fast 90/90, 1 3/4 headers ORY,TH400 with ATI 5500 stall w/o tb,12 bolts ,28*10.5*15....and about 3100-3200 lb......(race only car)

i did a calc. in this link:
http://www.nationaldrivetrain.com/calcs/dragcalc.html

and it says that i should go with 4.74 !!!......i'll rev. it to 7k....

i read that there is about 20% diff. in the RPM...due to TC slipping....is that true???...(the diff will be 1200-1400 RPM)!!!

hope to run 10's N/A

help a guy...

FANTAZ28

iTrader: (2)

i run a very similar set up.... except its stock short and 853 heads.
i run the same converter as you and it is very efficent and has very little slip... right at 3% or so. with the 430 and 28 i go through the traps at 6600 or so and thats at 124 mph. give or take 1mph

TNTaddict

what gears u r using??

FANTAZ28

iTrader: (2)

430 like stated in my first post

1998TA__1991RS

iTrader: (23)

im running almost the same exact setup as you other than a 4600 stall in a 4l60e and 4:10's in a 8.8" rear end, dont have any times yet tho

JL ws-6

iTrader: (50)

I am runnign a converter that should be about 5000, 4.10 gears and a 27x11.5 hoosier QTP.. should have it all together in the next couple weeks as it goes under the knife this weekend, I'll have reaults soon... although my setup is alot different, a good bit bigger CI, a cam that's a little bigger then a trex, and a heavy car, probably about 3600 with me in it Hopefully it will see 10's na on pump gas.. at least that's the goal.

Will know in a few weeks.

Houston999

iTrader: (3)

do you have the parts number fo the ATI TC and where did you buy it from?

Houston999

iTrader: (3)

i think you should go with the 4.56 with trex and 28" id you want the best ETs or go with 4.3 if you want more MPH and a good ETs.

BAIN

iTrader: (5)

Those calculators work pretty good, but for an auto you need to factor in slippage. I run a simular setup T-Rex, 4.30's, 4800 stall, 28" slick, and 3200 race weight now. With 4.30's and a 28" tall tire in third gear you can trap around 125-126 right at the rev limiter of 7000 rpm. If you are planning to mph any higher you need to change something (taller tire or less gear).
With that being said. A 28" tire and 4.56's aren't going to work for you. If you are set on running a 28" tire you may have to do what I'm doing right now and go down a gear to 4.10's.

JL ws-6

iTrader: (50)

my 27's and 4.10's should work out good then I hope, sounds like the middle ground

FANTAZ28

iTrader: (2)

that seems like a lot of slippage... mine slips under 3% like i said my car goes about 123-124 with a 430 and a 28 and its only at 6550-6600.

as far as where i got it from, i got it direct from ati. call them and talk to them and tell them your intrested in there what i belive they call "stock elimnitor" style converter.

let me know if that helps..

BAIN

iTrader: (5)

I have a 4l60e lockup Yank PT-4800. That's probably the reason because if I remember correctly someone told me the 4l60e isn't as efficient as a th350 or th400.

On the dyno my car goes from 380 rwhp unlocked to 425.7 rwhp locked.

SUX2BU

iTrader: (14)

I just did 421 rwhp unlocked

TNTaddict

thx alot guys.......


FANTAZ28... with 4.30 and 28 u went 123-124 mph.....at 6550-6600.....

so,i think 4.56 with 28 and 5500 will work great if i rev it to 7000-7200.....

FANTAZ28

iTrader: (2)

yup if you plan on revving it that high than yeah a 4.56 would be great.
i got a stock shortblock so i try to keep it out of that high of an rpm

tektrans

iTrader: (23)

I just made 466 rwhp unlocked and 601 ft lbs of peak torque!! he,he

LC

yeah but you got a 408... he is cam only......

tektrans

iTrader: (23)

Yeah, that cam only set up of his is pretty friggin' impressive.
I'm just excited about my new exhaust and tune, wasn't sayin' any more than that.

LC

i was not taking anything from you, pure envy

my car is slow as ****..

tektrans

iTrader: (23)

12.8 in 8000 DA, not so slow my friend!