01 gtp pulley question

**adamroblyer** · 10-08-2015

I bought a 01 gtp about a year ago and the owner had said it had a smaller pulley on the supercharger. I asked what size and he wasn't sure so I didn't think much of it at the time. Fast forward to now I checked the pulley and it looks like it's stamped with a gm part number, the number is 86016. I searched the web and didn't come up with much. Is this the factory 3.8" pulley? It has a 180 t Stat but as far as mods go that's it.

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**xxburkettxx07** · 10-08-2015

3.8"is stock pulley size not sure if you can just measure it or not

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**adamroblyer** · 10-08-2015

I took a tape measure to it but with the bolt sticking out of the center of the pulley it's tough to get and accurate read on it

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**Fivefingerdeathpunch** · 10-08-2015

Get one of these.

**adamroblyer** · 10-08-2015

I can't justify buying a set of calipers to measure one pulley one time

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**Scottydoggs** · 10-08-2015

you got a harbor freight near by? they got one for 5 bucks. works fine. i used it to measure the hub on my winter wheels so i could get spacer rings for em.

**BrandonHall10** · 10-08-2015

It's a stock pulley. I'm going to bet there's an "R" 180° from that part number also...

**adamroblyer** · 10-08-2015

I'll have to check harbor freight out. I'm about 45 minutes from the closest one. And yeah there is an R stamped on it too.

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**BillBoost37** · 10-08-2015

It's stock..

The size is 3.8"

**FordMan77** · 10-08-2015

And put the stock 195* stat back in. If the car isn't tuned for the lower temp thermostat it's not doing you any good since the fans are still set to come on around 212*. You may actually be loosing fuel mileage since the car isn't getting up to temp. These motors were designed to run hot.

**adamroblyer** · 10-08-2015

I was actually just thinking about that. In the year I've owned it the fans have only kicked on twice. He also said he was running colder plugs in it. If that's the case should I throw some 605 coppers in it? Or just use what is called for stock?

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**blueguy** · 10-08-2015

Originally Posted by FordMan77

And put the stock 195* stat back in. If the car isn't tuned for the lower temp thermostat it's not doing you any good since the fans are still set to come on around 212*. You may actually be loosing fuel mileage since the car isn't getting up to temp. These motors were designed to run hot.

Not really.

But okay.

Heat is what breaks everything down in these cars, and the rated temp that the t-stat is at is a solid 10-20* less than what the actual temp is...example: my 160* constantly ran north of 175*.

The tune will help but tossing the 180* in there now isn't going to harm anything. And if you think you're really losing that much fuel mileage, then I don't know what to tell you. I didn't even notice a difference with my 160*, except for letting it run for a minute or two longer on cold mornings.

**adamroblyer** · 10-08-2015

I drive mostly highway which keeps it pretty cool but this past winter my car never warmed up above 170ish

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**FordMan77** · 10-08-2015

Originally Posted by blueguy

Not really.

But okay.

Heat is what breaks everything down in these cars, and the rated temp that the t-stat is at is a solid 10-20* less than what the actual temp is...example: my 160* constantly ran north of 175*.

The tune will help but tossing the 180* in there now isn't going to harm anything. And if you think you're really losing that much fuel mileage, then I don't know what to tell you. I didn't even notice a difference with my 160*, except for letting it run for a minute or two longer on cold mornings.

Good to know. Never tried it but since everyone here suggested to leave it alone if not tuned for it that's what I always went with.