I don't see you having issues making 750whp with E85 and those turbos on the stock motor just keep your lower end torque in check for stock rods reasons. What dyno are you using?

In terms of the fuel pressure regulator, with a boost referenced one like the OEM one it will raise fuel pressure from base pressure as boost rises. Base pressure is whatever the fuel pressure regulator will regulate it at without boost applied. OEM is 3.8bar (55psi). If you're running 25psi the regulator will keep fuel pressure 1:1 to the boost reference so actual fuel pressure at the rail will be regulated to 55 (base) + 25 (boost reference) = 80psi fuel pressure at the rails.

When the regulator raises fuel pressure in this way it puts a higher load on the fuel pumps and they start to flow less potentially causing severe fuel pressure dropouts. Unless you've got a fuel volume flow limitation at the regulator that can't support enough to satisfy engine demand you're better off swapping the OEM pump/pumps for higher flowing versions. When you realize you need more flow out of your fuel lines at that time you'll probably realize that changing the FPR is also needed but usually these go hand in hand and in a lot of cases at that time you'd also be looking at making the fuel rail bigger accordingly. It all depends on your power goals/needs. Some people like to build it all for 1500whp right away some like to find what the changes required are and only change those. I'm personally in the latter camp but there are arguments to be made on both sides as always.

 

have you ever tested the OEM regulator to be 1:1 ?

 

Haven't had a chance/need to hook up an external fuel pressure gauge to it, yet, no. Have you tried it?

 

i have on E85 and that was not the case. im wondering if that was a fuel demand issue or if the regulator simly doesnt rise 1 to 1 from teh factory. id like to see it on a stock car or a stock car with just a tune and pump gas.

 

Where did you plumb the sender? I'll be putting one in to hook it in for failsafety on the pbc pro.

 

stock fuel pressure testing location by the filter. it was just a temporary solution to see what it was doing.

 

Wow so much info from you guys, this forum is really a champ.

 

That's a pretty common concern, but I've yet to run into issues from that or even hear of someone having issues.

I ran e85 on a 1995 Eagle Talon in early 2000's and most recently a 2006 Evo. Evo had similar mix of aluminum parts in fuel rail, etc. Never had an issue and daily drove it for 3 years on e85. My guess is new owner is probably doing the same for the last 2 years.

Would love to get my 997.1 Turbo tuned on e85 soon, but need to find someone in driving distance of Minneapolis to do it.

I'm guessing I'll also need to be ready to buy a new clutch.

 

If you've got a Cobb AP we could always tune the car remitely for you

 

Get a Cobb from PTF and do a custom e-tune!

 

Thanks for your observations and info. I am not buying or selling here, just interested in information that addresses the fact that alcohol is corrosive to aluminum and many rubbers and plastics.

So appreciate you sharing your experiences.


DC