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Old 02-05-2009, 11:09 PM
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T-400 stall torque converter

hay there
just looking for a bit of advice about choosing the right stall torque converter for my th400 trans. i dont know the first thing about torque converters. i built a blown chevy 350, 9.5-1 compression ratio. 284 cam with 480 lift. the motor and trans are going in a 67 chevy step side. non posi but in the future i would like to put a posi in her. any advice would be aprichiated
thanks
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Old 02-06-2009, 02:46 PM
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Quote:
Originally Posted by ninjaboy
hay there
just looking for a bit of advice about choosing the right stall torque converter for my th400 trans. i dont know the first thing about torque converters. i built a blown chevy 350, 9.5-1 compression ratio. 284 cam with 480 lift. the motor and trans are going in a 67 chevy step side. non posi but in the future i would like to put a posi in her. any advice would be aprichiated
thanks
Where does your Camshaft start making power? I would look for the stall to be about 500 to 800 RPM'S over where the Cam start's making power.
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Old 02-06-2009, 09:05 PM
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What rear gears and tire size? 9.5 cr is a lot for a blown motor, be sure to limit your boost if you'd like to keep it together.

That said, I'm using a 2800-3200 and it's stalling about 3000, T-400, 4:11 with 31" tires. Talk to a rep.
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Old 02-06-2009, 11:33 PM
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i dont know what gears are in it. i just got the truck and haven't really started working on it yet. yah i know 9.5 cr is a bit high but when i started building the motor i dint think i would be pouting a 671 on it, but then one poped up for sale really cheap and next thin i know theres a blower sitting on top of my motor. what do you mean "be sure to limit your boost" i dont know all that much about blowers. but hay gota start somewhere
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Old 02-07-2009, 02:14 AM
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You can't just throw parts at a motor and expect it to be right or to live. You need to learn, read, talk to people. I'll assume that's why you're here.

Consider this, if you bought a Weiand 6 -71 off the shelf for your big block, they come set up to produce between 10 and 12 #'s of boost. With a static cr of 9.5:1, at 12 pounds of boost your effective cr will be right at 17.3:1. How do you think head gaskets will live with that kind of pressure? You know boost is adjustable simply by changing upper and lower pulleys? If you run that much boost and static cr, you will definitely need a boost retard system to pull some timing out, and something more than pump gas to handle detonation.

Get your hands on a copy of Guide to Street Supercharging by SA Designs (SA-17). Here's a link to Weiand's tech pages as well, look at the pulley charts so see what kind of boost yours is set up for.

http://holley.com/TechService/Library.asp

Supercharger tech is at the bottom, it's a good place to start.
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Old 02-07-2009, 09:54 AM
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wow thanks thanks for the link ill have to run 2 pounds. at what compression ratio can you run on 94 octane gas?
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Old 02-09-2009, 08:26 AM
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TH400 converter

Look into American Performance Engineering. They have done several converters for myself and many of my friends with no complaints. Got the stall speed right where we needed it Good people to talk with, seem very competent.
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Old 02-10-2009, 12:33 AM
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ok ill look into them
thanks
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Old 02-10-2009, 09:00 AM
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TH400 stall converter

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