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Old 11-09-2006, 06:35 PM
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Torque converter question(s)

I have been messing around with my 87 caprice for a while, and I am starting to think that my problem may be related to my torque converter.

The problem has been that the car runs great in park or neutral, but it wants to stall pretty bad when I put it in drive.

I was able to get the car to stay running by cranking the idle way up (I don't have a tach in the car yet, so I can't say exactly, but somewhere between 1500 and 2000 rpm in N) and when I put the car in gear, the rpm's drop down to around 700 or so. Additionally, the car has very poor acceleration and a lot of stumbling.

I think that this problem is because I have the wrong torque converter. For some reason, I followed the advice of the guy I got my transmission from and used the torque converter from that transmission, which is from a stock chevy 350 in a 70's conversion van/camper.

So, here's my combo:

GM PP Crate 350 block, standard flat-top pistons.
3973487 Heads (GM 71 LT1 350 heads)
The cam is an Engle: EP-22HYD
Cam Lift: 320/.320
Duration @ .050 : 230/230
Lobe separation angle: 110
Powerband 1800-5800 RPM.

I have an Edelbrock TorkerII intake, Performer 1406 carb, and Hedman headers.

My transmission is a TH350, non-lockup.

So, my guess is that the torque converter I have on it now has a very low stall speed, and I probably need a much higher stall speed. I am wondering what I should look for. The vehicle is an 87 Caprice classic 4 door, otherwise stock.

Chris
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Old 11-09-2006, 07:34 PM
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Quote:
Originally Posted by chrisflock
used the torque converter from that transmission, which is from a stock chevy 350 in a 70's conversion van/camper.

So, here's my combo:
The cam is an Engle: EP-22HYD
Cam Lift: 320/.320
Duration @ .050 : 230/230
Lobe separation angle: 110
Powerband 1800-5800 RPM.

I have an Edelbrock TorkerII intake, Performer 1406 carb, and Hedman headers.

Chris
With a "truck" converter, you have an already too low stall speed converter for much of anything besides a truck.

The typical stall speed in a truck converter from the factory is 1200/1400 rpm's. That's a pretty hot cam profile for a stock converter.

Your cam wants something much higher than that, and the intake wants to work better at higher engine rpm's, you will be much better off talking to a turque converter manufacturer and telling them your combination, and they will likely give you a recommendation of 2200+ rpm's.
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Old 11-10-2006, 11:37 AM
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I didn't know the factory converters were that low, that really explains the stalling...my motor probably doesn't any noticeable amount of torque until at least 1800 rpm...

I was thinking of using the torque converter that was on this engine in the last car. That car ran pretty good, but it was a 79 camaro. I wonder if the weight difference (which probably isn't THAT much, since those late 70's camaros were awful heavy) and perhaps gear ratio difference would make that much of difference?

Chris
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Old 11-10-2006, 11:41 AM
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Diesel converters are even lower than that, around 1200-1400 rpm range.
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