8.3l Whipple vs. 10-71
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Tartilla (03-05-2024)
02-19-2022, 09:50 PM
#92
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02-20-2022, 03:39 PM
#93
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The 3.8's are super efficient and some may be disapponted when they wind them up, because they are so quiet. You really can't hear them at all like the ones before, which is a good thing because they aren't producing a lot of heat. My 525 efi's whith the 3.8's dyno'd 830 hp @ 7.8 lbs of boost and can go to 11lbs if wanted. Only downfall for me is my factory cooling on the 525's is really good for up to 900 hp, so i'll never fully use all the boost I have. This is just a reference for the 3.8 whipple question.
Detonation is more of a concern than cooling.
A the end of the day it`s all about cylinder pressure. more boost more pressure more detonation potential.
The 8.3 are also way too quiet.
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getrdunn (02-20-2022)
02-20-2022, 06:30 PM
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Last edited by getrdunn; 02-21-2022 at 09:04 AM.
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ICDEDPPL (02-20-2022)
02-20-2022, 07:14 PM
#95
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I agree with that all day long. These 2 were built for the whipples from start to finish and tuned for this setup. The only way boost will be added is if they are tuned for the smaller pulley if it is ever added to compensate for the change. I'm pretty sure I've got more than enough power for my needs in this hull, especially since no one has ever had this much ower in a 33 like mine. ICDEDPPL, sorry to derail your post and looking forward to seeing your Cig when its all finished.
02-22-2022, 09:33 AM
#96
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I`m thinking lower the compression to 7.5:1 and keep the boost and blower speed up at 10psi vs. 8.3:1 and 8psi .
Thoughts?
Thoughts?
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bigfarmer (02-22-2022)
02-22-2022, 10:56 AM
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so by this graph:
8.0:1 and 12 psi is 14.5:1 NA motor.
10PSI is 13.4:1
7.5:1 and 10PSI = 12.8:1 NA
8.0:1 and 8psi is 12.4:1
Last edited by ICDEDPPL; 02-22-2022 at 11:25 AM.
02-22-2022, 11:06 AM
#100
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Obviously there’s more HP left on the table but also potential failure and think non of us like that especially the limited time many of us have on the water. I know you wanna hit that 100 mark. Heck I would to as you were so close. But…….. 😆
Last edited by getrdunn; 02-22-2022 at 04:49 PM.
