EFI Gueru's
 

can a Stock 502 Mag EFI system work "with no fuel pressure changes" On 502 HO Crate engine. using stock exhaust.

Re: EFI Gueru's
 

no one knows ?
tyler Crockett increased 2.5 #s on a 497 HP engine with stock ECU
Rich as these 502's run I guessing no. but was hoping someone has done this.

Re: EFI Gueru's
 

what are the horsepower figures? I mean it will run it but if you have a lot more horsepower with your crate engines I will need to determine the BSFC to know if an EFI upgrade is needed. For the most part though yes it should work fine.

Roby

Re: EFI Gueru's
 

Duration @ .050" Lift Lobe
Int. Exh. Int. Exh. Centerline
211 230 .511" .540" 112

Re: EFI Gueru's
 

450 hp at crank

Re: EFI Gueru's
 

I believe that is just a stock 502 like the 502 Mag. The cam specs are a little different but I would think it should work just fine.

Re: EFI Gueru's
 

thanks guys will Do

Re: EFI Gueru's
 

is there Any way to boost fuel press?

Re: EFI Gueru's
 

is there any way to bump up fuel press on efi?

Re: EFI Gueru's
 

replace the fuel regulator or buy a regulator top cap kit 25 psi- 60 psi adjustment cp performance , eddie marine.. etc. has them around 69- 70 bucks.

Re: EFI Gueru's
 

The adjustable fuel pressure reg has to go on the fuel cooler not on the fuel rail. Add a fuel pressure gauge tee ed off the shrader valve so you can see pressure as you crank it up. I did away with the stock regulator ad installed an areomotive remote setup

Re: EFI Gueru's
 

jimjomack is the regulator on fuel rail for dampling the pulsing ?

Re: EFI Gueru's
 

http://www.mercruiserparts.com/Show_...ND+FUEL+COOLER

Part 15

Re: EFI Gueru's
 

I believe that is what Merc says about the reg on the fuel rail, but if you take it apart its just a regulater with a brass plug in it. This year when I freshen up my motors I am going to tap it and plug it up. Also it looks to me that it does not need the vacume line goig to it.