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Old 02-15-2010, 04:00 PM
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the torque convertor

Ha guys! Need some advice on how much stall I need for what I am trying to do. My cam card calls for a 2800 stall. My engine builder suggested 2000, since I did not want to race it. We used a 2000, I felt it did not idle good, so I put a hughes 2500. It improved but I am looking for the slipping clutch feel. Where it revs up a bit, then slightly jumps. Would 3000,3500,or bigger do it? the car is 71 nova 383 stroker, 286 comp cam, alum. heads 202 valves, 9.5 comp ,373 eaton read-end. :

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Old 02-16-2010, 09:49 AM
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I would think the 2800-3000 as recommended would work for you. The transition from neutral to drive will be much better and it will be easier to get a stable idle in gear. A 3000 will be a little 'squishier' just cruising around but it sure makes the car easier to drive, especially a heavier car. Mine is pretty well locked up at highway speed but as soon as I step on it the motor comes up a bit. I like mine.
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Old 02-16-2010, 02:04 PM
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Stall

Kind of a rule of thumb,"as cubes go up rated stall goes down" example: if your cam card shows 2800 stall converter for a 327-350 and you have a 383 that converter would probably stall at 2200-2400.I would look for a converter with a stall rating of 3000-3200.
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Old 02-16-2010, 03:31 PM
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Quote:
Originally Posted by JeffB
Kind of a rule of thumb,"as cubes go up rated stall goes down" example: if your cam card shows 2800 stall converter for a 327-350 and you have a 383 that converter would probably stall at 2200-2400.I would look for a converter with a stall rating of 3000-3200.
Sorry, but this is not correct, you have stated the exact opposite of what happens. A torque converter is a load sensitive device, so if you take one rated for 3000 stall behind a 350 and put it behind a similar spec 383 the stall will be higher due to the input of more torque from the 383, it will stall 3200-3300+ depending on the converter design specs and internal parts used.

Your statement is correct if you were talking about rated power bands for the camshaft , same cam rated to start making power at 3000 rpm in a 350 will start to make power lower (2500-2600 rpm) in a 383.

I will agree with the 3000-3200+ stall(or bigger, especially if you race it) converter recommendation, one of the biggest mistakes I see people make is buying too low a stall because they are afraid a higher stall will slip too much at cruise speeds. It just isn't that way with modern converters. I have for years used 4000+ stalls in street cars, never lost a tranny because of the converter yet, but I always use a BIG cooler, buy the biggest you can find.
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Old 02-16-2010, 04:57 PM
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re the torque convertor

Thanks guys! I think I will step it up to 3500 stall. I will let you know how it works out.
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Old 02-16-2010, 05:00 PM
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re the torque convertor

Your right on, my hughes 2500 is stalling at 1800 rpm.
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Old 02-16-2010, 07:20 PM
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Quote:
Originally Posted by peppers
Thanks guys! I think I will step it up to 3500 stall. I will let you know how it works out.

talk to Hughes. call them , ask for Matt or Pete... have your car specs ready for the chat
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