TPFKATK

How does a 2800 stall tc drive on the street? What difference will I notice going from stock in my 88? Anybody care to guess how much this will help my 1/4 times? Best of 13.56 so far...
Thanks
Harold

NoWorries

In order to determine how it will help your 1/4 mile, I think we need to see a graph of your torque and hp curves, or at least a list of mods.

I'm running a 2600-2800(I still don't know what both numbers mean) but at first, I thought it was very unstreetable, now, after about 18 hours of driving, its second nature and I don't know how I ever lived without it, I've got a temperature guage and with Mobil 1 and just the stock cooler, I've never gotten over 175 degrees, even in somewhat agressive driving.

Make sure to get a lock-up converter or your gas mileage will plummet.

jay17

What was it that made you not like it a first?

jpee

Mobil 1 is ENGINE OIL.....NOT trans temp... does your car have a gauge for TRANS TEMP.... NOT OIL TEMP!

I have a 96, with a Vigilante 2800 Converter, also my car came from the factory with an OIL temp gauge, & a TRANS TEMP gauge...

The 2800 converter will have NO affect on the temp of your ENGINE OIL..... but WILL affect your TRANS temp...

My engine oil temp around town is 180... at sustained speeds of 75-85 it goes up to 195..200.

As for the trans temp... with the 2800 converter, & an AFTERMARKET TRANS cooler, my trans temp is 150 on the highway... 170-190 around town..

Just last week I hit a rock (see Ralph saved me) and had to drive without the trans cooler, & trans temp went to 240..!

Remember there is a difference between OIL temp... & Transmission TEMP..

As for how it drives... its great, and you will like it, but an aftermarket trans cooler is a MUST... & it should be mounted where the air will get to it..

65Z01

I have the stock TC in the Vette but a 2,400 lockup TC in my IROC and realy like it. The Vette will be getting something in the 2,400-2,600 range.

Compared with your stock TC, you will get a little more slippage (and so heat) in town and of course on the highway it locks up so no difference. In town you won't even notice the difference till you stab the throttle; then the tach will jump (flash) to about 2600-3000rpm. This puts you higher in the power band.

To fully benefit from the the increase in torque you realy need drag radials. To see what I mean roll out in low gear to about 2500rpm and stab the throttle. Now imagine applying that much torque while your Vette is still stationary!

I was told to expect about .3 sec off my ET, but expect more like .20-.25 sec. Most of this comes from lowering your 60' time due to the increased power at launch. And foreget about punching it from a traffic light on streets.

jpee

Boy are you RIGHT Jim... I just took off my DRs & with the GSCs its like driving on a wet street..

Now I know what Austin Coil goes through when he tries to tune JFs car & not blow off the slicks...

CFI-EFI

2600-2800. That is the general range of the stall speed this converter will give you. Any one given torque converter will exibit a different stall speed in different cars. The more resistance to the converter, the greater the stall speed. In a heavy car with a lot of low rpm torque (big block?), the stall will be higher than the same converter in a light weight car with lesser low rpm torque. The converter manufacturers got tired of comebacks and complaints, because a converter didn't stall at the exact rated rpm. Therefore, most have gone to giving a "range" of stall.

TPFKATK

Thanks for the replies.
What is "flash the converter"?
Harold

65Z01

The "flash" rpm of the TC is the point to which the tach jumps when you pop the throttle before the speedo moves. It is a good approximation to the stall RPM of a TC. So to "flash" the TC is to bring it quickly up to the stall RPM.

Some racers launch off idle and let the TC "flash" up to the stall RPM. Others launch close to the stall RPM.

NoWorries

John, sorry, I meant Mobil Synthetic ATF, and yes, transmission temp:



I didn't like it at first because it took a lot more work to get the car moving, its not at all like stock. But like I said, its wonderful now that I know how to use it.

TexCorvette

Which is faster, idle or close to stall? I have a 2800, works great, but my tranny was just about dead before, so likely anything would be great afterwards :)

nickd

Flash stall is the peak RPM of the converter during a full throttle launch, the maximum your engine's torque can stall the converter. Let's say you have a 2800 stall converter, that does not mean it's going to stall at exactly 2800 rpm on launch unless you are using a transbrake. Depending on how much tq your engine is producing it's not unlikely to see slightly more stall above the converter's true stall rating at launch, this is what "flash" stall is.
The truest definition of stall speed can only reliably be determined with a Transbrake.




[Modified by nickd, 6:55 AM 11/20/2001]

mackeyred96

I've run both a 2600 and 3000 in my car. Very good driveability.
But I may have a problem on the street with my 4400+.

nickd

:eek: should be interesting. Are you staying with the Vigilante ? With that high of stall are you thinking about going with a non lockup ?

65Z01

John, after the 1-2 shift won't your RPM be well below that 4,400 mark even if you throw the shift at 7,000rpm??

If you shift up there wouldn't a 3,600rpm TC be more appropriate.

Beach Bum

John, Wow !!! you really gonna do this ?? Low 11's will probably follow, your set-up would be getting close to what Wheelsup has achieved. I have no clue on the streetability of this though, I think it would be a slusher at the street lights.

Regarding a 2800 rpm converter.... its great for the street, I agree with the aftermarket tranny cooler and mounting it somewhere where it will get some good cool air. The performance results will speak for itself your 1st trip to the dragstrip... but do not forget sticky tires... this modification is for the most part worthless without them.

good luck
Beach Bum

mackeyred96

Todd, Now I only drive it to and from the track. I'm thinking about a tow-dolly for as far as I go for now. Trailer down the road. Dave Bush at Cartek has a 4200 in his T/A and drives it to the track. I just don't feel the 3000 is enough.

Beach Bum

John,

I really think you're gonna like your timeslips with a 4400 stall... the LT-1's flat torque curve should love all the stall you give it, and you should reap a benefit going down the track too as opposed to just the 1st 60 feet. A little more gear or race with a smaller tire should help too.... if you can hook it up... I think 26" ET streets or a 28" drag radial will be severely challenged to hold your low 1.5's or maybe even 1.4x 60 foots this combination will create.... I will guess that in good air you'll be low, low 11's with as good as you're running now.

Anybody who is going to put in a 4400 rpm converter officially has the NMP disease.... congrats !! :D I'd consider that much stall too... but the effect on my Superram motor would not nearly be as dramatic as a LT-1 manifold equiped motor. :(

later
Beach