what is the size of the stock TB? - Pontiac GTO Forum
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post #1 of 8 (permalink) Old 03-12-2005, 03:48 PM Thread Starter
 
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what is the size of the stock TB?

What is the size of the stock Throttle body on our cars? (04' GTO)

I saw an after market one today that was 90mm. That seems awefully big.
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post #2 of 8 (permalink) Old 03-12-2005, 08:12 PM
 
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I don't know exact specs, but I've seen the TB on a 2005, and it definitely looks like a larger unit.
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post #3 of 8 (permalink) Old 03-12-2005, 10:10 PM
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2004=75mm
2005=90mm

A 90mm TB on the 04 is good for 7 - 12 hp depending on the make.

Randy



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post #4 of 8 (permalink) Old 03-13-2005, 06:00 PM
 
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If you buy a 90mm TB would you need to buy a 90mm intake or will the stock LS6 intake for the 04 gto be good enough?
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post #5 of 8 (permalink) Old 03-14-2005, 06:13 PM Thread Starter
 
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thanks for the reply!!!


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post #6 of 8 (permalink) Old 03-15-2005, 03:37 PM
 
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I wouldn't bother with a larger TB unless you're putting in a FAST LSX intake manifold...otherwise a nice port/polish job on our stock TB's is good enough.
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post #7 of 8 (permalink) Old 03-15-2005, 05:54 PM
 
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How much do you think a nice port/polish job of the stock TB would actually help? Above was posted that a 90MM is good for around 7-12 hp so how much would you gain with a 78 or 80MM TB or would port/polish the stock put us at that?
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post #8 of 8 (permalink) Old 03-18-2005, 09:00 AM
 
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It's not a mod that I would put on the top of my list. It'll yield you an extra few ponies, but don't expect huge results.

P&P'd TB goes for ~ $150+

Personally, I don't buy the above claims (no offense, I just don't think it's realistic). If you go with a FAST LSX intake and 90mm TB you might yield 12hp. Most only show those gains if they're running FI or H/C.
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