IROCThe5.7L

Hey guys,

One of my spring modifications was going to be a Vig 2800 stall and NT 555R Drag Radials. I have 2.77 gears.

My one buddy is trying to tell me 2800 is too high, and i'm throwing away almost the whole TPI TQ powerband. He also says it is going to effect driveability, and it is going to feel like a different car. Because the engine is going have to work a lot harder to get the car moving.

He says I should get a 2300, because you can hold it there, then go through the whole rpm band. But im under the impression if you actually get traction, your better off launching with the 2800 stall.

I also read if I did get a 2800, it is most likely not going to stall that high with my stock 350 tpi. And also if you get a better quality convertor, your not going to have to gas the hell out of it to get it moving.


Sorry for the length, any input would be appreciated!

White91GTA

I have a 3000 stall in my TPI car. It does feel like a whole different car and does take more to get it going, but you will NOT lose your TQ powerband. With my converter and a stock motor, I made 349rwtq@ ~2700rpm

Mark 89Formula

You made the right choice. My 60' times dropped from 2.0x to a best of 1.79 with a 2600 RPM Vig and change from 3.27 to 3.54 gears (all times on Nitto DRs). There's even more left in it since I ran it in total street config; didn't adjust pinion angle, pump up the airbag, or drop the pressure in the DRs. Ever car is a little different but my best results came holding it at 1500 RPM then flooring it on launch. Shift recovery is also better. RPMs dropped to 3500 RPM after the 1-2 and 2-3 shifts with the stock converter. Now it only drops to 3900 RPM which definitely helps acceleration, particularly in 3rd gear.

Cruising RPMs are up 200-300 RPM, but once the converter locks there's no difference at all. You'll have a little more slippage with your 2.77 gears but it really shouldn't be objectionable.

Floor guy

I agree with your buddy.

IROCThe5.7L

So it would really be that bad if I got a vig 2800 huh? What confuses me is I hear people running 3200-3500 saying "Oh it's not bad at all, its streetable".


I though a 2800 would be ok because it most likely wouldn't stall to 2800 with a stock 350 tpi. And also the "higher" quality convertors arent as bad as far as getting the car moving from a stop.

Orr89RocZ

iTrader: (20)

this is my setup

stock 350 TPI with headers/catback and gutted airbox with K/N's

i also have the 2.77 gears.

i blew my tranny last year i believe in august and got it rebuilt for 450hp or so and a Edge custom converter with 2800rpm stall

it does transform the whole car. its real nice from a slow roll from 15-45mph it just gets up and goes! rpms flash to 2800rpms and it slams forward. good feeling and the shift kit makes it nice too LOL

i think 2.77 gears are not optimal but they arent bad. TPI makes peak at 3200rpms according to the charts. 2800rpm is good, utilizes all of the torque from 2800 rpms on which makes a great launch LOL

my tranny guy is a drag racer on the weekends and has a 9 second camaro. he was impressed with my little L98 LOL he liked the combo of the 2800rpm stall and that L98 TPI motor with the 2.77 gears. he said he really wouldnt go much higher than 3.27's and thats what i am gonna do. i got 3.27's going in this spring and it should be perfect combination...

now for super ram or something with higher rpm power band, i would go 3.45's or 3000 stall with 3.27's.

my 2800rpm stall sorta acts like a 3000stall as it seems to flash to 3000rpm on the tach but thats cuz the tach might be off LOL. but nonetheless, i can brake stall it to 2600-700 rpms without the tires breaking loose. let off the brake and the car pulls forward pretty hard.

at the track i stalled it to 2400rpms or so and sorta walked it out of the hole as it was my first time ever and i wasnt sure if the worn tires would grip. well they did and next pull i hit it kinda hard and it just bit and went. pulled a 1.94 60 foot on worn out 16inch street tires and on prokit springs/adjustable tokicos. and there was more in it too, it felt like i could broke mid high 1.8's....

my LCA's were not in the right geometry since i lowered it some. it had some noticeable traction problems on the street after the lowering. but i have the brackets and spohn LCA's that have to go on this spring too and i will see how much difference they make. i have confidence that this car has low 1.8's in it easy... on street tires. on 555r's, 1.7's i would think

TunedPort 335

Hey Joe, i think a 2800 stall Vig would be perfect for you. My converter is rated for 3200-3400 but stalls around 3000 on my motor.

At the track I can brake stall it to 2500 (highest i can go) and when i launch it flashes to around 3200 or so. When I dynoed my car a few years ago (before pullies/airbox/catback) I made peak TQ ~ 3200rpm. My converter could be a little smaller but i am very happy with it. Also, with the lockup... it feels like a stock converter on the highway.

Around town it is definitely noticeable while driving, the rpm's do go a little higher before the car starts moving but its nothing to be worried about. As far as gassing the hell out of it, thats not true really. Surprisingly I get the same exact MPG with my new converter as I did with my stock one. 15mpg city/20mpg highway

I also noticed a huge difference from a rolling start with the new converter compared to my stock one. It jumps right up in the powerband now. Like Mark89Formula said, the shift recovery is a big difference with a higher stall converter. It doesn't bog down as much when it goes into the next gear (which I think is crucial especially with your gears)

PS you prob already know but I have 2.73 gears.

IROCThe5.7L

Thanks for the detailed replies guys, I really appreciate it

LilJayV10

iTrader: (5)

What you have to understand is people that run 3000-3500 stall run it because they need it due to their engine configuration. For example, the 93 Z28 that I just built has a vig 3000 in it, but the cam is 230/236 @.050. Typically your stall speed is based from your cam's @.050 stats and a some other things. Tpi cars don't breath about 5000 very well without some work, and the realitve small size of a TPI cam doesn't justitfy running a 3000 stall, IMO anyway. I don't know if your car is modded or not, you might have mentioned it but I might have over read it.

I would think a 2400-2600 would be more of what you are looking for, I think a 3000 is going to put you to high in your tourqe curve to really take advantage of the great quailties that a vig has and lets face it, tourqe is the best part of a TPI engine. If you get a 9.5 2600 stall convetor, it WILL stall that high if not a little higher. Good convertors are a different world compared to junk sloppy 12 inch convetors.
My recomendation would be to call Dana at probuilt or Terry at Precision Industrys and talk to them. Stall speed is one of the most important choices on a car and should be made wisely.

gearhead0384

iTrader: (7)

I have a car similar to yours. I have what is in the sig, and the 2800 stall is too small for me I think. I can honestly not tell there is a stall in there. There are no drivability problems at all!! Go for a 3000 or 3200 stall. Thats what I will be doing this summer, when I send my TC back in to get restalled.

Kevin

LilJayV10

iTrader: (5)

With a good convertor you aren't supposed to be able to tell it's there driving around, it's not till you smack the gas it stalls up.