High Stall TC

[jimmyboy8301]

I"m getting ready to put some 3.73's in my car and i'm pretty set on buying a 3000 stall TC, how much of a difference do you think that will make on the car in A) 1/4 B) acceleration from a stop C) acceleration from a rolling start?

[coldkilla]

correct me if im wrong but 3000 stall seems a bit much unless your wanting a pure track car. youll have to reprogram your computer too.

[Tru2Chevy]

Actually, with an LS1, 3000 is really small. Most guys use 3500+

- Justin

[Fasterthanyou]

I'd go with a 2600-3200rpm stall for a street driven LS1 with 3.73's. Generally speaking, with better gears in the rear you don't need as much stall. This is because you won't spend much time below the stall speed and even when you are you'll have mutliplied the engine torque PLENTY to get off the line hard. For this reason alone I never recommend gears with a radical converter. You're gains will be minimal. Infact, you could even loose performance with too high of a converter if it's still a large diameter beast! Most of the gains are actually had by not the increase of stall speed but instead by the lower inertia and higher torque multiplication during slip. So 10" and smaller converters don't necessarily need to be ordered with a high stall, especially on a near stock motor. Just my 2 cents about that.

[LT!freak94]

ok so ummm am i loosin power i dought it but i got a 2500 stall with 3.73 gears i dont know nothin abought tc oh and it a lt1

[coldkilla]

2500 is good for an LT1 car, I didnt know about the LS1's though

[foff667]

fwiw on my pretty stock 98 my tci 3500 stall got me 6 tenths, but once I went heads/cam it was way too small for my application and wouldve needed a 4000+ converter to take advantage of my newfound powerband. Â*I'd say go with at least a 3500 even if you dont plan on doing a cam at any point, you wont be dissapointed. You'll probably want to tune your shift points or at least bump your rev limiter up a couple hundred rpms though...i was smacking mine on the 2-3 shift with the stock shift points/limiter.

[JW]

Originally Posted by foff667

fwiw on my pretty stock 98 my tci 3500 stall got me 6 tenths, but once I went heads/cam it was way too small for my application and wouldve needed a 4000+ converter to take advantage of my newfound powerband. Â*I'd say go with at least a 3500 even if you dont plan on doing a cam at any point, you wont be dissapointed. Â*You'll probably want to tune your shift points or at least bump your rev limiter up a couple hundred rpms though...i was smacking mine on the 2-3 shift with the stock shift points/limiter.

I was wondering what heads & cam did you used to have in that camaro anyway and what kinda horsepower did u have and what kinda numbers at the track were you running?

JW

[foff667]

Originally Posted by JW

I was wondering what heads & cam did you used to have in that camaro anyway and what kinda horsepower did u have and what kinda numbers at the track were you running?

JW Â*

98 LS1 camaro
3500 stall
pacesetter LT's, no cats, borla catback
very well worn hoosier qtp's
everything else stock including suspension, steel DS, & 2.73 gears 12.7@107 in ~50* weather

added
tsp 231/237 112 cam
patriot S2 heads
Aluminum DS
BMR TA
Spohn adj. LCA's
Cartek tuning
373 rwhp
339 rwtq
locked converter, dynoed in second gear because the 2.73's wouldve pulled 6800 rpms to about 190mph on the dyno.
12.9@112mph in similar conditions ~50*

pulled cartek tune in favor of stock
personally adjusted via hptuners
running airflow table
base idle table
TC lockup tables
missfire tables
deleted codes
bumped rev & speed limiters up
set shift points
12.7@112 in 95* weather last august...wrecked the car in either late august or early sept.

Im sure I wouldve been able to run 115mph + by bumping my timing up and getting my a/f correct but neither were touched for my maiden track runs

[Fasterthanyou]

I disagree with Bill. He had 2.73 gears. Of course he needed a high stall converter! If you're installing 3.73's you will not need a high stall, you won't ever be down that low. Unless you're shifting really early on that LS1 you won't need much stall. Now if you don't do gears, then that's a different story. Get a high stall converter, it's practically doing the same thing.

[foff667]

my thinking is your stall speed is dependant upon your peak tq as well as the shift extensions(where the rpms fall back to after each shift)...ls1's stock make peak tq at 4000 rpms...my 3500 was very good on a stock powerband car...i could footbrake it up to around 2500-2700 rpms & it had shift extensions of like 4100 rpms so even though it was at the bottom of its hp it still could rely on the tq to pull it back through. Also my 3500 was very driveable as is & only wouldve been better with some tuning tweaks. Dont get me wrong I think if your going to keep your car pretty stock like marc has you cant go wrong with a 3000-3200 stall converter but if you plan on a cam swap at any point why go through the trouble of changing it out twice? Fwiw the cam only record holders both have 5000+ stall converters with 4.10 gears if i remember correctly.

[camaroAL]

engine torque,cam profile,gear ratio, compression etc... all play a factor in choosing the right stall speed, in a 9:7 compression 305 street engine with 4:10 gears a 2500 was not enough i needed a 3500 to reach the engines peak performance. that was with a much different cam than stock. you really dont need to upgade your converter to feel a difference with the gears, but if you plan on doing any head or cam work 3000 is not going to be enough.

[foff667]

you'll almost always feel(and see in timeslips) more of a difference when installing a higher stall TC compared to higher gearing.

[jimmyboy8301]

i already have the Richmond 3.73's, i was given them for free as a favor did a friend. The TC is being sold to me for dirt cheap.

[foff667]

if you can get a 3000 stall dirt cheap in good shape i say go for it with traction the combination of the 3.73's & tc should get you deep into the 12's.

[bad64chevelle]

Hey for you who know converters and stuff real well, let me ask you this question. My chevelle with its 327 Th350 and 4:10 gears is really sluggish downlow. It has a pretty big cam (cant remember the specs) but its a fully built motor. As for the trans the converter is STOCK. When I got the trans built at ziggys i was supposed to get a new converter, but somehow that never happened and i got a stocker, how much do you think i would gain going to a ATI converter, and what speeds would you recommend? If you need full specs let me know. Thanks
Jon

[foff667]

where does it make peak tq, peak hp & what is it used for primarily? Street cruiser.

[bad64chevelle]

Originally Posted by foff667

where does it make peak tq, peak hp & what is it used for primarily? Street cruiser.

The thing still is having tuning issues, but peak tq is probably around 4000 RPMs. The car is a street car but will most likely see a bit of track time.

[foff667]

id say stay with something mild...a 2800-3000 stall with a tight str would do ok at the track & still keep driveability pretty high on the street. If you had a trans brake on the 350 it might actually do pretty well at the track...foot braking though i dunno how well you'd be able to stall it considering if its a stock type braking system with any decent hp & a tight str it might be rolling through the brakes by like 2200rpms

[bad64chevelle]

Yeah, this stock converter is really killing me. The car has an extremely hard time moving from a roll, but hauls ass up in the RPMs. The thing has problems lighting the tires up, but some of that is in the suspension. Im going to be ordering an ATI Converter for it once i can get the money together. This trans has been nothing but problems, and still may be thrown out in way for a 4 speed.

[jrsfast84]

Originally Posted by Tru2Chevy

Actually, with an LS1, 3000 is really small. Â*Most guys use 3500+

- Justin

get a 10" - 3500 stall TCI has one that works great,(#242932) in jegs,about $530..00, try SLP-call before you order anything,just to make sure you get the one you need. JR1.

[foff667]

Originally Posted by jrsfast84

get a 10" - 3500 stall TCI has one that works great,(#242932) in jegs,about $530..00, try SLP-call before you order anything,just to make sure you get the one you need. JR1.

thats the one I had