Offshoreonly.com - Supercharging a 500 EFI

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Supercharging a 500 EFI (https://www.offshoreonly.com/forums/general-q/115195-supercharging-500-efi.html)

INDY27

10-28-2005 09:57 PM

Re: Supercharging a 500 EFI

Bryan,
I have had a Stage II Procharger on my boat for four years with no issues related to the Procharger, Procharger, whipple, vortech...all the kits are good but SETUP is the key! Get in touch with Mark Boos at Precision Marine, he is one of the most knowledgable people around.

ZXXX Donzi

10-28-2005 10:09 PM

Re: Supercharging a 500 EFI

Who did your installation? I am playing with the idea down here in Eufaula.

TxHawk

10-29-2005 08:49 AM

Re: Supercharging a 500 EFI

Quote:

Originally Posted by 800XCR

Not to rain on the N/A parade or anyones abilities, but keeping the 500 efi system in conjunction with E-top headers will NOT result in an easy 600-625 HP on pump fuel without supercharging it regardless of what you do to it.

I have seen a few of the so called dyno sheets showing it, but for some unknown reason, the boats never showed the benefit of a 100+ hp gain.

The intake won't support the airflow required to make that kind of hp without it being forced and the headers certainly won't. Especially with only 502/509 cubic inches. Call CMI and ask them.

Good Luck.

Not true, I have seen over 670HP from a 540ci engine on the 500EFI platform. That reused the intake and e-top headers.

INDY27

10-29-2005 10:12 AM

Re: Supercharging a 500 EFI

Quote:

Originally Posted by Louisville Boater

Who did your installation? I am playing with the idea down here in Eufaula.

I did the install with the help of a very knowledgable freind of mine and had Precision Marine remap my ECU. There is really not that much to the install on a EFI motor, just make sure to get the ecu remapped and that you understand how to put the engine in base timing mode and its a peice of cake. :chimp:

ZXXX Donzi

10-29-2005 11:13 AM

Re: Supercharging a 500 EFI

Good deal. I will call Precision Marine. I got someone that has done a few few down here but does not reprogram.

800XCR

10-29-2005 04:36 PM

Re: Supercharging a 500 EFI

Excal.....I'm not buying. However, I am willing to learn as most of us are. Please post engine specifics including head and cam info along with a dyno sheet with a/f ratios and egts. How much faster did the boat go when installed? Thanks and look forward to the education.

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