Anonymous

I have a Vig-multi disc 3800 and it is not quite working out. Instead of going with another re-stall & pump change, I am going to go with a Vig. single disc. The multi. was stalling too early and not letting my cam get into its operating range soon enough, killing my 60'. It was stalling around 3200.

My best 60' was a 1.695, but it usually goes around 1.73 - 1.75 dead hooking.

My car is H&C making 443 rwhp @ 6150 rpm and 398 rwtq @ 5100. (I also have N20). I need a converter that will work good NA but perfectly on the N20. The rev limiter is set for 6800 rpm but could go to 7000.
I am looking for 1.45 to 1.49 60' on motor and 1.39/1.40 on the squeeze.
I have every suspension component available. With the right converter the car should 60' right there.

What do you recommend? I am thinking 4000 stall?
I think 4400 is too high for the juice. People tell me 3800, but I don't think that is high enough. What do you guys think or know? I typically shoot a 100 shot but I may go 200 if I have to someday .

Camaro, 4L60E, 3.73, 3500 lbs race weight.

Tiger2o69

iTrader: (16)

Maybe you just need a bigger multi disc so you can still lock it up. You could get a 4400 md and it would be around a 4000 but still be able to lock it so you wouldnt lose your power through slippage.

what range does your cam make its power?

Anonymous

Well I already had it restalled once. It picked up a little but not much.
My car breaks 400 rwhp at 5300 rpm and stays that way until it hits the limiter at 6800 rpm making 427 rwhp.
So that is over a 1500 rpm spread.
At 4700 rpm I break 350 rwhp so that is a 2100 rpm spread.
At 4000 rpm it makes 278 rwhp and 365 tq, so that is a 2800 rpm spread.

Also the multi disc is heavier than a single disc and I think this effects the 60'.
This makes the car wind up slower at the track. JMHO

This would not effect for example the dyno #s because the dyno rollers are lighter than the car.

Tiger2o69

iTrader: (16)

Do you run your converter locked during runs? What rpm does it drop to after shifts?

I ran mine some w/o it locked and the rpms dropped to ~5000 and started climbing again I was thinking that was great because over 5k rpms Im in the 300+ range.. Then I looked at how much was being lost through slippage.

I pull 1.60-1.75 60's off the line then lock it up at about 60..

Not trying to talk you into getting a md im wondering if I should keep mine once I have the h/c on.

So what your saying is that because you cam dosnt have much low end tq is the reason the md isnt good for your setup? Do you know how much slip you are getting at high rpms when its not locked?

JS

iTrader: (4)

I'd run that same multi u have now but have them stall it another 200 rpm....U know have a N20 and NA car is almost impossible,u either set the car up for juice or u set it up for motor..

Case in point MY CAR built for all motor power
3350lbs
Shift point 6500
MAX Trap rpm 6800
125 X 4.10 X 336 divided by 26 = 6600 trap rpm
Yank TP4200
4.10's

Car was built soley for Na..
Throw the nitrous in the mix and everything changes.

Anonymous

Tiger,

You are not supposed to lock the converter until the car shifts into 2nd.
I have not locked my conveter on a pass yet at the track.
I am still trying to get the car dialed in as it is.

I don't know what is going on with the shift points because the tach & speedometer can't keep up with the car.
I use the rev limiter to tell me where I am upstairs. I shift at 42 MPH and 77 MPH respectively (I think).

Yes, my car can't get up on the cam quick enough to get a good 60'.
The stall is just too low and I am not making enough tq down low.

JS,

As usual you are correct. However, my car is making low 11, high 10 sec. power NA.
If I back off for 3.73s and a few other things I might lose a tenth here or there but I should be running quicker than I am. My 60's are way off.
I am aware of the compromises I have to make to get the full N20 permormance and I have made them.
But the car isn't even working on the N20??? So I know something is wrong???

I am thinking of restalling the converter again to like 4200 or 4400.
I know that is too high for a single disc but with where my car makes power and how multi's come in early I think it might work?

I went from a 3200 to 3800 stall and picked up only one tenth in my 60' with the multi. My best 60', even with the juice, is only 1.679 and that is with a 3200 pill. Even that way I am traveling before the N20 engages. So the converter is too tight for sure. The weak bottom end is killing the flash as well. This car should 60 in the 1.40 to 1.49 range Juice and no juice.

The MPH is fine for the less than favorable conditions. The car has gone 127 unlocked. Even with the car bogging off the line and losing time & track space.

All of my ET is in that 60', no news there.