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Old 07-20-2014, 11:33 AM
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no trans cooler on drag car?

recently a friend of mine completed a car for nhra stock class racing. it was a high dollar build and engine and trans builds were done by out of state people that specialize in class race cars.heres the kicker... his tranny guy said that with his gm 200 trans and i believe a 5000 converter a cooler wasnt needed as in no lines out of the trans at all. he`s not running a trans brake though. how common is this?? if i thought that there would be no issues i would try that on my 383/turbo 350 5000 stall with brake combo i`ve been running for the last few years.

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Old 07-20-2014, 11:49 AM
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I would want to know why the trans builder said this...if he has a plausible explanation for it, then maybe do it...but it is contrary to every other trans guy I've ever dealt with.

Maybe he has fluid volume or pressure from pump turned down so low that there is none that can be spared from holding the trans in gear and in lubrication and still have enough pressure left to send some out to a cooler and back. Some less power consuming/rotating HP gain type thing that those SS racers must chase to be competitive at the class index level maybe?? Goes with the same reason they use the tiny 200 trans and work out a way to make it live?? Less power lost is the only reason they mess with those 200's to begin with, it is the lightest internally of the 3-speed Automatics.

You've got a combo that has proven to work and not break parts...why would you even consider removing the cooler?? Especially with the heat made in a stalled converter while on the transbrake.
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Old 07-20-2014, 03:19 PM
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I'd say your buddy miss understood the trans guy... and it should be hooked to the factory cooler, but not an extra one...
I haven't looked at stock NHRA rules in a few but I'd bet an extra cooler is out of the question..
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Old 07-20-2014, 03:41 PM
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were talkin no cooler, no tranny lines at all.
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Old 07-20-2014, 04:43 PM
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Originally Posted by ballsout1 View Post
were talkin no cooler, no tranny lines at all.
can you even run it that way in NHRA stock class
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Old 07-20-2014, 05:06 PM
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Yes: many drag racers do not run trans oil coolers.

Some racers loop a line between cooler fittings, some trans builders modify the pump internal to loop the oil flow, cooler fittings are then plugged off.

These are drag race only vehicles , not "hot lapping" the car.

Lot of stock class cars are very concerned with weight, so the cooler system is left off.

Some of these racers will have 2 AN fittings or quick connect fittings, to hook up a pump to circulate the trans oil thru the converter & trans to cool the oil down
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