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  #21  
Old 09-09-2011, 03:20 PM
Gen1dak Gen1dak is offline
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Ok so we are on the same page. Now, something else to consider. These are production vehicles. While the computer senses engine load and vehicle status, speed, etc., the computer also has hard limits programmed in for things like torque converter lockup. If you have a 2600 rpm stall and the computer is trying to lock up the converter at less than , say, 2200 rpm, you have a problem. Unless you can go in and reprogram the lockup point to above the new stall speed, you're gonna have a mess. If it locks up at 2200 and stalls at 2600, you going to induce even more slippage! As I understand it, OBD II systems can be reprogrammed. Also, an external transmission cooler is mandatory with such a high stall. Again, what speed is the truck going at over 2600 rpm for lockup? You're gonna be flyin' before lockup, but if you're okay with that, fine. Just be aware. Overkill is hard to live with. You can always build in more power.
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  #22  
Old 09-09-2011, 03:32 PM
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Well once it locks there will not be more slippage as it will be locked. 100% transfer from engine to the trans once it locks. So for example....my truck with 3.55 and the 545rfe trans....at 70mph I'm around 1,700 rpm, the converter locks while cruising there is no change compared to the stock converter except the aftermarket will be more efficient....I'm not sure if this is what you are saying or not...? Lockup wouldn't be an issue...
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  #23  
Old 09-09-2011, 10:15 PM
Gen1dak Gen1dak is offline
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Oversimplification on my part. You are correct that the clutch lockup results in a direct mechanical connection. The problem I'm thinking of is with the coupling stage, as follows:
Coupling. The turbine has reached approximately 90 percent of the speed of the pump. Torque multiplication has essentially ceased and the torque converter is behaving in a manner similar to a plain fluid coupling. In modern automotive applications, it is usually at this stage of operation where the lock-up clutch is applied, a procedure that tends to improve fuel efficiency.
If you're locking up several hundred rpm below stall, a lotta power is being lost in the upper gears. Obviously this wouldn't be an issue off the line. The solution is lower stall or higher lockup speed.

Last edited by Gen1dak; 09-09-2011 at 10:19 PM.
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  #24  
Old 09-10-2011, 12:18 AM
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Yeah you're going over my head now as I only understand TC's about 75%, but my understanding is they won't lock under any sort of load...
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Old 09-10-2011, 01:35 AM
Gen1dak Gen1dak is offline
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They have to lock under some load or you'd only get lockup while coasting.
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Old 09-10-2011, 09:49 AM
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Quote:
They have to lock under some load or you'd only get lockup while coasting.
What I meant was that under any real load, like say 1/4 pedal or more they wouldn't lock...
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Old 09-15-2011, 08:03 PM
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whats a good converter to get for semi mod'd daily doing light towing and wanting better performance? eventually need to replace oem and might as well get something better. sorry to thread jack, thanks
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  #28  
Old 09-15-2011, 09:10 PM
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whats a good converter to get for semi mod'd daily doing light towing and wanting better performance? eventually need to replace oem and might as well get something better. sorry to thread jack, thanks
Look into Edge, Circle D, and APS converters. Three companies that make good converters. There are others for sure, but these are the ones I've been looking into. The higher the stall the the more heat that's generated, this would be bad for towing, just keep that in mind. You'd be best contacting each company and talking your plans over with them, they are experts on the subject and can help you out.
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Old 09-15-2011, 09:18 PM
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Quote:
Originally Posted by crip View Post
whats a good converter to get for semi mod'd daily doing light towing and wanting better performance? eventually need to replace oem and might as well get something better. sorry to thread jack, thanks
Take a look at edge. They make good converters and Andre will hook you up with whatever you need for your application. I would recommend circle d to you but I don't think they make a converter for your transmission.
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  #30  
Old 10-24-2011, 10:23 PM
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felt your pain put 32's on mine with 3.55 wouldnt even break em loose put 3.90's in er and it lites em up just pullin out
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