Street driving with high stall converter? - Chevelle Tech
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post #1 of 14 (permalink) Old Nov 11th, 10, 11:41 AM Thread Starter
 
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Street driving with high stall converter?

Will street driving with a high stall converter hurt the transmission?

I have a 8" ATI treemaster 4800 stall speed and when cruising at 55mph the rpm is at 3000. Will this cause excessive heat?
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post #2 of 14 (permalink) Old Nov 11th, 10, 11:55 AM
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andy
 
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Re: Street driving with high stall converter?

Run an auxillary cooler and you will be fine
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post #3 of 14 (permalink) Old Nov 11th, 10, 12:03 PM
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Talking Re: Street driving with high stall converter?

As stated, make sure you run a rock solid trans cooling system. Heat is the enemy of a transmission.

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post #4 of 14 (permalink) Old Nov 11th, 10, 12:04 PM
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Re: Street driving with high stall converter?

Deep pan and a good cooler is a must.

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post #5 of 14 (permalink) Old Nov 11th, 10, 12:08 PM
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Re: Street driving with high stall converter?

Quote:
Originally Posted by 66360horse View Post
Run an auxillary cooler and you will be fine

X2

Get a large cooler, maybe go the extra step and get a trans cooler with it's own thermostat controlled fan.

My 4300# car has a 10" 4000 converter that flashes to 4500 with a decent size cooler and I do not have any issues.
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post #6 of 14 (permalink) Old Nov 11th, 10, 12:38 PM
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Re: Street driving with high stall converter?

Also keep in mind that it all depends on how loose/tight your converter is. There are a lot of high stall converters out there that are built a little on the tight side that act just like stock converters at cruising speeds.

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post #7 of 14 (permalink) Old Nov 11th, 10, 12:49 PM
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Re: Street driving with high stall converter?

yeah, mine has about 4000rpm in it. Its a little looser than some of the modern stuff(which as just mentioned...some modern converters really feel mild and stay tight at part throttle), but mine isnt too bad. Id say im in the same boat as you. Runnning around at 2800-3000 with a converter that stalls much higher under heavy throttle. I have a B&M stacked plate cooler run in series with the rad cooler, and a finned aluminum trans pan(mine isnt an extra capacity pan). No heat issues to speak of. The cooler is mounted in front of the rad with plenty of airflow.
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post #8 of 14 (permalink) Old Nov 11th, 10, 1:39 PM Thread Starter
 
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Re: Street driving with high stall converter?

I have a B&M racing trans cooler, the largest one mounted in front of the radiator. Deep trans pan. Is there a difference in heat buildup city/highway? So far I haven't driven far enough to even show anything on the temp gauge. I'm not even sure it's working or else the cooling system is rather effective.
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post #9 of 14 (permalink) Old Nov 11th, 10, 1:40 PM
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Re: Street driving with high stall converter?

My yank SS 3600 drives so close to stock its crazy. Then flashes to 3600 when you get on it hard.

Locks at cruise so it's exactly like stock on the highway.

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post #10 of 14 (permalink) Old Nov 11th, 10, 2:10 PM
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Re: Street driving with high stall converter?

I used to drive around with an 8" 4000 stall converter and I did not have any issues with heat. The Trans Temp gauge never got above ~170.

I used Synthetic Fluid and a large Trans Cooler.

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post #11 of 14 (permalink) Old Nov 11th, 10, 3:19 PM
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Re: Street driving with high stall converter?

10" ATI converter behind my big block and a TH400.....stock pan and a big auxiliary cooler. flashes at 3800 but will roll out under 2500 under normal driving. fluid still pretty pink since 2001...no issues.

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post #12 of 14 (permalink) Old Nov 11th, 10, 3:39 PM
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Re: Street driving with high stall converter?

Quote:
Originally Posted by capricornus View Post
I have a B&M racing trans cooler, the largest one mounted in front of the radiator. Deep trans pan. Is there a difference in heat buildup city/highway? So far I haven't driven far enough to even show anything on the temp gauge. I'm not even sure it's working or else the cooling system is rather effective.

with stop and go driving, if there is gonna be any amount of converter slip....its gonna be introduced more in this type of driving environment. and when you're working the converter...thats where the heat gets generated. Plus it would be assumed that the volume of airflow(when you say city drivng, I figure longer periods of slow speeds) isnt going to be as high, so the cooler probably doesnt radiate quite as much heat as it does with constant 55mph air flowing thru it.

On the highway though...it doesnt take much throttle input to maintain speed. The momentum of the vehicle does most of the work for you. So, you arent really heavily loading the converter at a steady state cruise. Slippage should be minimal at this point, and heat production should be lower as well. not to mention the higher volume of airflow working in your favor.

Even still though, with your good cooling setup, and assuming that converter isnt a ridiculous sloppy mess at slower engine speeds, it shouldnt create a radical amount of heat during city driving either... My old converter was real bad. It only had about 3200 rpm of stall speed total, but it didnt even begin to get tight til about 2700 rpm. it was very loose at 2500 and under, and it clearly made more heat in stop and go driving. I still kept it alive for a long time though!

An 8 inch treemaster stalling almost 5 k isnt exactly a cheap converter by any standards, so it would be worthwhile to add a trans temp gauge in your situation just to be sure you keep them temps well under 200.
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post #13 of 14 (permalink) Old Nov 11th, 10, 4:48 PM Thread Starter
 
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Re: Street driving with high stall converter?

yeah I have trans temp gauge but I hasn't really done any street driving just 1/8 mile at a time. Maybe that's too short of a distance to get it warm enough to show anything on the gauge.
I'm just worried because my old th350 started to slip soon after I had done some city driving and a couple of max speed rushes. But that trans had been abused at the strip for 10 years so maybe that's only natural to give up sooner or later?
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post #14 of 14 (permalink) Old Nov 11th, 10, 10:33 PM
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Re: Street driving with high stall converter?

I run an ATI 3500 stall and I never generate more heat than my eng does and only running an aux cooler,If eng is 160 then tranny is 140-150 never climbs higher whether street,racing,hiway !
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