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HISSMAN
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Because the stock intake is better?
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xt6wagon
Well-Known Member
Well midrange is 6 to 7k rpm. Close gearing and high rpm really change what's the middle of the powerband. It should be rare on a track that you go as low as 5k.
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pinero61
Well-Known Member
- Thread starter
- #7
I'm rev'ing out to 8 now, 9 shorty. I went CJ, since the 350 just can't flow on the same level at that high of a RPM. The throttle body alone is a huge difference. Every graph I've seen to date has the 350 tapering out past 7,500 on a smaller displacement engine than yours.
Can you link me to the tests you're speaking of? I'm curious to see what injectors and throttle body they are using. Also, are they running factory exhaust manifolds?
Myshelby3425
Well-Known Member
It doesn't fit the gt350.. It's already been tested.. Also it's not worth the upgrade since the gt350 intake mani is pretty damn good. VMP did comparison, look it up.
GT P-TREE
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How is a Coyote not letting go at 8k, let alone 9?
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pinero61
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- Thread starter
- #12
There's people spinning them much higher than that. I know of a few running out past 10k.
Most people with only tunes are reving to 8k, with my build 9k will be easily obtainable. With the exception of the crank our engines are basically the same configuration. You're even better off with the sleeve coating and pistons you have. The 5.2 should be capable of a reliable 10k with the right supporting modifications. That doesn't mean much if you're not setup handle the increased flow at that RPM.
VMP did the testing?
Most people with only tunes are reving to 8k, with my build 9k will be easily obtainable. With the exception of the crank our engines are basically the same configuration. You're even better off with the sleeve coating and pistons you have. The 5.2 should be capable of a reliable 10k with the right supporting modifications. That doesn't mean much if you're not setup handle the increased flow at that RPM.
VMP did the testing?
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pinero61
Well-Known Member
- Thread starter
- #14
Found the reason for the drop off....
The car retains stock exhaust. If you can't get the air out fast enough, it doesn't matter what you can put in. So, that brings me back to the original point. This engine with full exhaust, E85, and supporting mods would immensely benefit from a CJ. It should fit with drop mounts and the strut bar removed. 530-550 RWHP would probably be within the realm of possibility without opening the engine. I would at least do CG and OPG before turning the redline up much more.
The car retains stock exhaust. If you can't get the air out fast enough, it doesn't matter what you can put in. So, that brings me back to the original point. This engine with full exhaust, E85, and supporting mods would immensely benefit from a CJ. It should fit with drop mounts and the strut bar removed. 530-550 RWHP would probably be within the realm of possibility without opening the engine. I would at least do CG and OPG before turning the redline up much more.
Myshelby3425
Well-Known Member
Gt350 mani is a great all around mani.. There is a reason why VMP went back and kept the gt350 mani vs the CJ. The stock gt350 2.75" exhuast does flow a lot more that the stock GT exhaust.
Throw it on your GT350 and let us know how it goes.
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