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Pontiac Forum: 07 Pontiac Grand Prtix GT 3.8L V6
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  #1  
Old October 3rd, 2017, 09:12 AM
tstreets27 tstreets27 is offline
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07 Pontiac Grand Prtix GT 3.8L V6

Hello,

I would like to start out stating that this thread is for advice, tips, and knowledge.

I have a Grand Prix GT that i am deciding to keep and would like to get some input about keeping it in great driving condition as it ages. Also any input on ways to increase HP is always appreciated.

Mileage: Approx. 175,000

Transmission has been rebuilt.

Supercharged

Any other info needed to assist me feel free to ask.

Thank You
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Old October 3rd, 2017, 10:26 AM
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melsg5 melsg5 is online now
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Personally I wouldnt try increasing horsepower on an engine with 175K.
As far as maintenance I would go by the owners manual recommendations
I dont have a 2007 but below is 2008 and would be the same
http://www.vadengmpp.com/owners-manu...-GrandPrix.pdf
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Old October 3rd, 2017, 01:13 PM
tstreets27 tstreets27 is offline
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Well my plans are to rebuild the engine and the supercharger over in the near future. Possibly do an engine swap for a new engine after i look into it some more.

I'm looking to fix this car up as much as i can over the next year or so.
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Old October 3rd, 2017, 01:44 PM
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in that case check out what this company offers for your engine

https://zzperformance.com/how-to-beg...0-powered-car/
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Old October 9th, 2017, 06:53 PM
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I would change the Supercharger Oil if it has not been done before, usually should be done around 50,000 miles. I was never able to find what the specific Oil GM used so I just bought the GM brand. Here is a video showing how I did it. It really made about a 0.2 second difference in the 1/4 mile.

https://www.youtube.com/watch?v=JpvwtgYlJFw

You can also check the adjustment of the Bypass control valve, our 1999 was misadjusted from the factory, and would not fully close, not allowing full boost to build up.

When you rebuild the engine there are many camshaft, rocker arm, exhaust, overdrive pulley mods ect.... those 3800 SC engines can make really good power. But as already stated with 175,000 miles I would not go to crazy, although exhaust upgrades would not hurt the engine IMO.
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