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Yes wide open there right around 12. Through the rpm range they bounce around a tiny bit 11.8 to 12.4. 12 is perfect.
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Originally Posted by SB
(Post 4630955)
Are e sure the tune is spot on ? Doesn't sound so with some AFR#s in the 11.5's.
ArcticFriends just got 40-50_hp on a customers set of engines doing more fine tuning. It happens ! Thread is a few away from this if you click on "New Posts" |
Originally Posted by Lou.Slater
(Post 4630959)
Yes wide open there right around 12. Through the rpm range they bounce around a tiny bit 11.8 to 12.4. 12 is perfect.
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They made 524/530hp @ 5300rpms. Your spinning them 5000 at WOT. What is the hp difference between rpms? I agree that 12:1 is rich, though safe. Realistically you maybe gained 25hp per engine with the 525 cam vs 500. Prop for 5300-5400 rpms and let us know the difference.
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Just for a reference when I ran my 380 hour stock HP500EFI motors on the dyno in full trim I got 515 and 513HP. You didnt gain much but if it was only a cam no intake, exhaust or head work I wouldn’t expect a ton. |
You would probably only gained about 15-20hp over stock with the cams and a correct tune.
You most likely could have just left the stock tune and then made some very small adjustments while in the boat. I'm guessing its a combination of the correction factor on the dyno and tuning issue. |
How much total timing are you running at 100 kpa/map from 5000 rpms up?
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I am Louis good friend and neighbor, trying to help him get this figured out also. One thing that I think is important here, and I have already talked to him about, is props. He is running the same pitch props, however they are a different set, on my advise he is switching back to the old props. I think it very well could be props as he is running less RPM and going almost the same speed.
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Originally Posted by JRider
(Post 4631065)
I am Louis good friend and neighbor, trying to help him get this figured out also. One thing that I think is important here, and I have already talked to him about, is props. He is running the same pitch props, however they are a different set, on my advise he is switching back to the old props. I think it very well could be props as he is running less RPM and going almost the same speed.
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How'd it run over the weekend with the old props back on?
Very interested in the 525 cam in the 500 EFI results! You Jet it down too? |
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