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UD pulley = Overheating ??

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Old Jul 23, 2008 | 06:03 PM
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Default UD pulley = Overheating ??

So Ive got my new motor in and almost broken in good.

The only thing related to overheating vs. last motor is the 25% UD pulley. Will this cause it to run hotter than usual?

The temp gauge on the AC controls has shown 99+ the last couple days so Im sure that doesnt help but that is typical summer heat here in the nothwest part of Louisiana.

Should I invest in a good radiator? Thanks guys
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Old Jul 23, 2008 | 06:25 PM
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I'd invest in a 160 degree thermostat if you haven't already.

Most people get an UD pulley when they do a cam, and at the same time get a tune, which causes the fans to come on earlier.

A tuner, or a handheld can adjust the hi-speed/low-speed on/off temps of the fans.

I think stock is 220ish low speed 235 high speed

My car (stock tune cam pulley) used to routinely reach 235 on hot days
It never gets above 210 now(aftermarket tune, cam and UD pulley)
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Old Jul 23, 2008 | 06:30 PM
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Also, after my H/C install, (with Powerbond %25 UDP) my car ran a little cooler than stock, so I doubt it's the pulley. Later I added an EWP, and it's about the same as before, but during 100+ days, in slow traffic, stays stable at 195 deg.
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Old Jul 23, 2008 | 06:41 PM
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Originally Posted by Corvette-Chris
So Ive got my new motor in and almost broken in good.

The only thing related to overheating vs. last motor is the 25% UD pulley. Will this cause it to run hotter than usual?

The temp gauge on the AC controls has shown 99+ the last couple days so Im sure that doesnt help but that is typical summer heat here in the nothwest part of Louisiana.

Should I invest in a good radiator? Thanks guys
Are you overheating, or is it just running hotter? What temps?
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Old Jul 23, 2008 | 06:42 PM
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What are your fan temps? Did you blow out the radiator while it was out, we did an 04 last summer and the radiator was amazingly dirty/plugged. I bought a DeWitts I plan to install when I do the motor. Kind of sad seeing it in a box in the middle of summer.
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Old Jul 23, 2008 | 06:57 PM
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Originally Posted by jedblanks
I'd invest in a 160 degree thermostat if you haven't already.

Most people get an UD pulley when they do a cam, and at the same time get a tune, which causes the fans to come on earlier.

A tuner, or a handheld can adjust the hi-speed/low-speed on/off temps of the fans.

I think stock is 220ish low speed 235 high speed

My car (stock tune cam pulley) used to routinely reach 235 on hot days
It never gets above 210 now(aftermarket tune, cam and UD pulley)
Ive already got a 160* stat and a tune. Fans are set to some on sooner but not exactly sure what temp

Originally Posted by zeevette
Also, after my H/C install, (with Powerbond %25 UDP) my car ran a little cooler than stock, so I doubt it's the pulley. Later I added an EWP, and it's about the same as before, but during 100+ days, in slow traffic, stays stable at 195 deg.
hmm...

Originally Posted by lucky131969
Are you overheating, or is it just running hotter? What temps?
Its overheated once and runs very hot in daily driving....temps anywhere from 230ish to 260. AC starts to get warm and thats not good when its 100+ degrees outside

Originally Posted by vettenuts
What are your fan temps? Did you blow out the radiator while it was out, we did an 04 last summer and the radiator was amazingly dirty/plugged. I bought a DeWitts I plan to install when I do the motor. Kind of sad seeing it in a box in the middle of summer.
I usually blow it out everytime I have it on the lift but I didnt do it when I put the motor in bc I didnt take the radiator out.
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Old Jul 23, 2008 | 07:07 PM
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Are these temps while moving, or in traffic...or both?
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Old Jul 23, 2008 | 07:12 PM
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Originally Posted by Y2Kvert4me
Are these temps while moving, or in traffic...or both?

Both.....obviously though if I get on an open road and cruise they drop to 210ish but it still seems higher than it did in the past
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Old Jul 23, 2008 | 09:09 PM
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Is all the air out? I found having the nose up during coolant fill helps a lot.
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Old Jul 23, 2008 | 09:23 PM
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I filled it the old fashion way.....at the shop I have the snap on vacuume tool that uses shop air to suck it all down but I didnt use it. Its about due for an oil service so I guess I can try blowing the radiator off then go from there.

I was basically just seeing if others in similar weather have had problems with an UD pulley
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Old Jul 23, 2008 | 09:53 PM
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I haven't experienced any overheating issues with my UD pulley, which was installed at the time as my H/C swap
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Old Jul 24, 2008 | 12:22 AM
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Originally Posted by slvr76
I haven't experienced any overheating issues with my UD pulley, which was installed at the time as my H/C swap


No problems with mine either and I'm still using the stock radiator.

I do have a 160 and re-programmed fans set at 188-182/194-188.
Of course I am running warmer temps in this summer Texas weather, but nowhere near what you are.
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Old Jul 24, 2008 | 05:58 PM
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Originally Posted by LoneStarFRC


No problems with mine either and I'm still using the stock radiator.

I do have a 160 and re-programmed fans set at 188-182/194-188.
Of course I am running warmer temps in this summer Texas weather, but nowhere near what you are.
The last 3 days have been the hottest days of the summer and I sure can feel it......That may be the case with the car to because today it ran fine
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Old Jul 24, 2008 | 08:01 PM
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Originally Posted by Corvette-Chris
The last 3 days have been the hottest days of the summer and I sure can feel it......That may be the case with the car to because today it ran fine
Glad to hear it.
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