What's up?
Thread Starter
Instructor
Joined: Apr 2006
Posts: 215
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From: Conway AR
What's up?
This week I had a new WP (GM high performance from Summit) installed, plus a Opti-spark. I used the MSD unit (ain't no comparision to the OEM). BTW, the old thermostat had numbers on it-180C4. Is that a 180 degree stat? It had been running around 200 degrees most of the time, if it got hot, I'd turn on the AC and it would cool down to about 200. Didn't like slow driving-it'd go to 220 real quick.
With the new WP, it's running at 192 with the AC on and cools down to 190 with it off. Can't get it hot in slow traffic, big difference. With the AC off, it takes a LONG time to get up to 218 and the fan to kick on, then it cools down in about 2 minutes and the fan kicks off. The old WP looked good except the rear bearing was starting to come apart. No leak at all. I can't believe the difference in cooling. I didn't take the housing off to see what the thermostat was rated at, I thought they were all at 200 degrees from the factory. It'd damn sure running a lot (7 to 15 degrees) cooler than the old one.
Any ideas?
With the new WP, it's running at 192 with the AC on and cools down to 190 with it off. Can't get it hot in slow traffic, big difference. With the AC off, it takes a LONG time to get up to 218 and the fan to kick on, then it cools down in about 2 minutes and the fan kicks off. The old WP looked good except the rear bearing was starting to come apart. No leak at all. I can't believe the difference in cooling. I didn't take the housing off to see what the thermostat was rated at, I thought they were all at 200 degrees from the factory. It'd damn sure running a lot (7 to 15 degrees) cooler than the old one.
Any ideas?
Drifting
Joined: Mar 2008
Posts: 1,756
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From: Wichita KS
"I thought they were all at 200 degrees from the factory"
Stock thermostat is a 190 degree. Someone had to replace it with a 180 that you found in there.
Sounds like you caught that water pump right in time. What is the Summit part number of the pump you chose?
Stock thermostat is a 190 degree. Someone had to replace it with a 180 that you found in there.
Sounds like you caught that water pump right in time. What is the Summit part number of the pump you chose?
Thread Starter
Instructor
Joined: Apr 2006
Posts: 215
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From: Conway AR
My question is: How come the new waterpump and stock replacement t-stat runs about 8 degrees cooler than the old one? really, in slow traffic, it runs about 20 degress cooler than the old one.
I'm really tickled it works so good. It just susprised me and I don't understand why it works so much better than the old stuff that hadn't failed yet.
Also, I thought that stock 94 LT1's came with a 200 or 196 degree T-stat, this one appartently didn't. Anyway, the stat that was in there, had 180C4 on it. I don't (didn't) know exactly what that meant. I was hoping someone would tell me IF what I thought was right.
Sorry I'm so slow in replying, sometimes, I'm out of pocket.
bill
I'm really tickled it works so good. It just susprised me and I don't understand why it works so much better than the old stuff that hadn't failed yet.
Also, I thought that stock 94 LT1's came with a 200 or 196 degree T-stat, this one appartently didn't. Anyway, the stat that was in there, had 180C4 on it. I don't (didn't) know exactly what that meant. I was hoping someone would tell me IF what I thought was right.
Sorry I'm so slow in replying, sometimes, I'm out of pocket.
bill
