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Old 07-14-2010, 09:01 PM   #1
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Default Difference between GTP and SSEI motors

Okay so I am curious, what is different in the GTP'* motor that gets it the 20 extra hp over the SSEi'*? Is it just the way the computer is programed or is it something else?
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Old 07-14-2010, 09:25 PM   #2
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you must be talking about the 04+ grand prix. they have the Gen 5 blower which is more efficient than the Gen 3. there is more i think but not for sure
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Old 07-14-2010, 09:38 PM   #3
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The valves are a little bigger from what I understand
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Old 07-14-2010, 11:51 PM   #4
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Didnt the GTP use the Series III? or was that just the non supercharged GT'*?
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Old 07-14-2010, 11:52 PM   #5
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the 04+ GP used the series 3 engine for both N/A apps and */C
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Old 07-15-2010, 07:29 AM   #6
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S3 L32 (SC motor) had different rods, slightly larger valves. Maybe different pistons and the Gen V blower. LIM hole for blower is about 3/4" larger than a S2 L67 LIM hole.
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Old 07-15-2010, 08:47 AM   #7
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That might explain it then...why didn't I think about that myself. So which motor is better to build off of, the Series 2 or 3? Or are they about equal to the amount of hp gained in the end with the same mods?
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Old 07-15-2010, 09:04 AM   #8
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Depends on price, availability etc etc.

I used an L67, added the Gen V, Stage 3 heads etc etc. At about 450HP never had an issue with the motor. Either bottom end is plenty durable.
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Old 07-15-2010, 11:38 AM   #9
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Quote:
Originally Posted by BillBoost37 View Post
S3 L32 (SC motor) had different rods, slightly larger valves. Maybe different pistons and the Gen V blower. LIM hole for blower is about 3/4" larger than a S2 L67 LIM hole.
Pistons are the same but connecting rods are stronger
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