for my ws6... i know i can power brake it up to 1500... when the tires start spinning... does that mean its a 1500 converter? in my old formula i could only powerbrake to 2100, with my 2400 stall.

what are the tranny gear ratios? 1-2-3-4

you would also never shift into 4th at WOT top end right? you would run out of power before redlining 3rd?

also, is the tranny in my ws6 the exact same 4l60e as was in my 95 formula?


thanks a bibbidy-bunch!


Jared

 

The only well to tell a conveters "true" stall is with a transbrake. What you have discovered is "brake stall". This is gonna be lower than true stall, as you demonstrated with your other car. Pretty academic though, since no one uses a 4L60 with a brake, AFAIK.

Rich

 

ok...

this is where i ask you what a trans brake is/does

 

I believe that stock stall is somewhere between ~1600 - 1800. I know with my car, if I try to "brake stall", it really starts loading up the brakes by about ~1200 RPM? (I can't remember at what point it'll actually break loose at though ). Stall speeds aren't EXACT either ... also, converters will usually "flash" a little higher than their rated stall speed (meaning, the point where they lock when you give it gas really quickly from an idle).

Gear ratios are as follows:
1 - 3.06:1
2 - 1.62:1
3 - 1.00:1
4 - 0.70:1

Just as a point of interest, 3rd gear in an auto is the same as 4th gear in the M6 (1:1 ratio). That's why the 6-speeds are referred to as having "double over-drive" (0.50:1).

I don't think that anything changed internally in 4L60E's between '94 - '02, but I think that LS1's use a different converter and flexplate?

 

oki doki..

so besides a higher brake stale at the line... what does a higher stall do to make you run faster?


this is something i've had half assed explained to me a million times to no conclusive point...

 

When do you think a motor makes more power ... at idle, or at ~3000+ RPM? If you tried to launch off idle, the car would bog seriously. However, with a stall converter that doesn't really grab until ~3000, then the motor is making more power when the converter locks and puts the power to the wheels. It's like taking a standard and "dumping the clutch" at idle, vs. at ~3000 or whatever given RPM. The higher the revs are when you dump the clutch, the more power that's going to the wheels.

 

ok... but if its like a clutch... besides a brake stalled launch... whats driving the car forward up to 3000 when it locks? are you saying its like riding the clutch and letting it slip a little till the engine gets to a higher rpm to engage fully?

 

Pretty much. Remember, the torque converter is a fluid coupler --- I mean, it's using oil against oil to "lock" itself up, where a clutch has plates that make physical contact with each other. That's why a torque converter is never really 100% "locked" ever (they're damn close, but always have a small degree of slippage).

With a stall, it doesn't mean you won't get ANY forward motion until you're at its stall speed, but when you hammer the gas, it'll instantly spin up to whatever stall speed it is before really launching the car. Where the factory converter is ~1600 - 1800, that's as high as it'll spin before launching the car.