INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

GT2-3 in a 6L?

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Old 09-19-2006, 07:43 AM
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i've always heard that guys LOOSE boost when going with a aftermarket cam. Although, i think i understand what you're saying is that you will be gaining boost over you CURRENT cam since it's overlap is causing boost loss now.?

this is the only reason i havn't done the GT2-3 cam yet. I'm running a 2.8 pulley on my LQ9 and only seeing 8lbs of boost max. i don't want to loose any at all. i really would like to be making 10psi.
Old 09-19-2006, 12:08 PM
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Originally Posted by zippy
The downside to it is that it idles smoother than stock.
LOL, put that on the list of things to be worried about huh?!
Old 09-19-2006, 03:56 PM
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Originally Posted by Holty
i've always heard that guys LOOSE boost when going with a aftermarket cam. Although, i think i understand what you're saying is that you will be gaining boost over you CURRENT cam since it's overlap is causing boost loss now.?

this is the only reason i havn't done the GT2-3 cam yet. I'm running a 2.8 pulley on my LQ9 and only seeing 8lbs of boost max. i don't want to loose any at all. i really would like to be making 10psi.
Anything you do to remove airflow restriction in your engine will reduce your boost.Ported heads,LT headers and a longer duration cam all will reduce your boost but not your horsepower.The reason the GT2-3 cam works so well is that it delivers good performance within the working parameters of the MP112 supercharger.If you drop 2 lbs of boost while gaining 30 hp,you have a win-win situation.You don't have to worry as much about detonation killing your motor and you are making more power.
Old 09-19-2006, 07:09 PM
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I can give a real world testimonial to that. When I put the LTs and true duals on, I lost 2psi. I went from 9 to 7. I was mad until the tuning got done and it made the exact same power on 7 as it did on 9. So, 2psi less strain on the engine and same power level. My hope is that the GT2-3 will get me the 2psi back because of the negative overlap. Plus I think the 118.5lsa will give me much better idle and street manners than my current 112lsa. Even though I will miss the slight lope in the exhaust.
Old 09-19-2006, 09:13 PM
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What's everyone's opinion on how the GT2-3 cam would work with 1.8 rockers?
Old 09-19-2006, 10:42 PM
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Originally Posted by wkdivr
What's everyone's opinion on how the GT2-3 cam would work with 1.8 rockers?
I run Comp 1.75s with mine with no problems,but I would check for coil bind on the valvesprings before trying 1.85s.With 1.85s you'll be looking at .629lift.
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