How to choose a converter?

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Post  bb429power on January 4th 2013, 9:32 pm

Well I still have time before I get a converter, I figured I'll either have to buy one used or get a custom one built by "whatbumper". During this time I would like to learn a little more about torque converter selection. I know I need one, launching at 1500, 2.0 60ft, but running a 108 mph. The biggest I've bought is a 2600 for a street rod, this car will be strictly for racing. I don't know what is too big and what may hurt my ET. Is there a thread where this was discussed already? If not any advice would help.

This is a small block car, turns 7,500rpm max. Probably just under 3,000lbs, 4.10 gears. C4, trans. Currently footbraking...

Yes I could just let the converter wiz build me one for my setup, but I myself want to know what to be looking for in a torque converter in a racing only application. Very Happy

I also found a c4 for sale, reverse manual, 4,000 stall on the transbrake. Might be interested.
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Post  richter69 on January 4th 2013, 11:01 pm

gonna need an 8" if you want it to run, thats a tall gear to imo.
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Post  ultimatelenny on January 5th 2013, 11:18 am

An 8" converter configured to stall at approx 58-6000 would be the quickest and fastest piece you install. Make sure to get with your converter guy and give him as much info and details on your combo, including dyno sheets if available. When looking for a converter, I would not only want a piece that is guaranteed to perform and be as durable as advertised, but also be working with a company (person) that is willing to work with you to give you a converter that works in your particular situation, especially after the sale. Service and support is as important as the product itself. I hope this helps you out.

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Post  bb429power on January 6th 2013, 11:04 pm

That did help a lot, and why an 8 inch? Last I heard smaller makes it looser and bigger diameter makes it tighter. Just curious why the 8" is optimal Very Happy

And as for the gearing, I know its not the best right now. I have a 4.56 gearset in the plans but I wanted to see how she does after a converter swap and chose my gearing based on the new setup Cool 4.56 sound about right though?
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Post  richter69 on January 6th 2013, 11:50 pm

here is what a loose 8", a 4.71 gear, and a 75 jet will get ya........

http://m.youtube.com/index?&desktop_uri=%2F#/watch?v=imC_xYaumLk
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Post  bb429power on January 7th 2013, 12:05 am

richter69 wrote:here is what a loose 8", a 4.71 gear, and a 75 jet will get ya........

http://m.youtube.com/index?&desktop_uri=%2F#/watch?v=imC_xYaumLk

I don't think I'm putting down THAT much power Laughing what stall? Transbrake? what rpm are you launching at?

I really want to run a transbrake, just a matter of if I can find something used because I can't afford one new right now Laughing
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Post  richter69 on January 7th 2013, 12:13 am

4600 chip, the spray makes it go 6800 or so, Lenny is gonna fix that...... Wink
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Post  ultimatelenny on January 7th 2013, 9:08 am

Hi Justin, an 8" converter would be the quickest and fastest in your combo as a race only application. You could get away with a good 9.5 converter configured correctly, but an 8" would out run it
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