what r the differances between Series II and Series III motors? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-05-2010, 03:35 AM   #1
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Default what r the differances between Series II and Series III motors?

i was looking at a 2003 Bonneville with a Series II. my girlfriends sister has a 2004 Grand Prix GT2 with a Series III. what r the differances and benefits of each if one is better than the other.
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Old 04-05-2010, 08:56 AM   #2
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First off, there is no such car GT2, it'* still a GTP.

Differences are a Gen V M90 instead of the Gen 3, possibly larger valves and different piston rods. Drive by wire vs cable for TB control.
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Old 04-05-2010, 12:58 PM   #3
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The series III is better but never came in a Bonneville. You can change the top end pretty easy by putting a GenV blower on your Series 2. The L32 connecting rods are also stronger. I'm not 100% sure on these next two facts but I don't think the ETC TB from the Series III can be used with our system and also I think the intake was updated to allow better flow.
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Old 04-05-2010, 02:07 PM   #4
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put a blower on series II to make it a series III? im confused. Now such thing as a Grand Prix GT2? Im looking at it. This car has all the options including a NON supercharged series III motor
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Old 04-05-2010, 02:13 PM   #5
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Reminds me of the Porshe GT3.

Pontiac Grand Prix
SE
GT
GTP
GXP

If you see a badge that says GT2, please post a picture because it'* a new one. Just hit up Rockauto and search for parts. No listings for GT2.

And yes.. Most people take the Gen V (more efficient) charger and bolt it onto their S2 motor. It'* not exactly an S3 motor, but it'* got the biggest improvement.
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Old 04-05-2010, 02:15 PM   #6
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i think by GT2 it is the higher tier option package it will say GT on the car but by looking up the VIN it will show GT2 as the option package
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Old 04-05-2010, 02:20 PM   #7
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You mean an RPO code?
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Old 04-05-2010, 02:22 PM   #8
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Quote:
Originally Posted by BillBoost37 View Post
You mean an RPO code?
ya it would have GT2 as the RPO for the higher trim my friend has an 04 GP GT1
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Old 04-05-2010, 02:30 PM   #9
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That'* not a model though..lol
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Old 04-05-2010, 02:31 PM   #10
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ya i know they are GTs that'* it
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