i am going to e85 in a couple days and i need to know if my single walbro will hold up.. i went with the FP Red setup with all bolt ons and stock internals.. i went with the 1200cc injectors and im hoping for 450awhp or more.. will i be ok on the single walbro.. i talked to ams and they said i need a double pumper or in-line fuel pump.. any help is greatly appriciated.. thank you

 

A twin pump set-up would be great. But you will be pushing one pump to the max to have enough fuel for 30 psi on the red. I would suggest staying around 25 to 28 psi with one walbro 255.

 

I have the FP Red with 1250cc injectors, and I was running out of fuel with a single pump right around 29-30psi. You can make it work for 30psi, but your fuel map will have to heavily compensate for it at higher RPM. The single pump should be good for ~420-430whp.

 

thanks alot guys.. i appreciate the help.. im gunna stick with the single pump and hopefully can make 430 awhp.. thanks agian

 

would a fuel rail and a fuel pressure regulator help?

 

I will be installing a fuel rail on my car next week to see if it helps.

 

Most setups with single pumps max out right about 450-460whp on our mustang dyno on E85.

The highest so far is 480whp on our dyno, for a single pump. The only difference with this car is it has a upgraded fuel rail and -6 AN line from the firewall to it. Still have complete fuel control. IDC's are around 89%, which doesn't mean much though because as soon as the pump can't do anymore the IDC's will shoot through the roof.

I'm convinced the rail helps for sure.

- Bryan

 

With a "stock" Walbro I was out of fuel at 24 psi and 430 whp. With a modified (pressure relief valve pushed-in) I was able to get to 28 psi and 460 whp.

 

I forgot to mention, none of the single pumps on our dyno have been modded.

 

So they didn't have the pressure relief valve munged shut?

 

Nope. Dropped-in unmolested walbros. I frown upon that mod.

- Bryan

 

Interesting. I thought it was needed if pushing more than around 26 psi of boost.

 

I'm only on the stock turbo still, but I run an unmodified Walbro to 30 psi with no problem.

 

thanks alot guys.. im gunna pick up a fuel rail tonight and just wing it with the single walbro, injectors, and the rail.. hopefully i can make descent power.. AMS is saying only around 400 to 420 on there dyno but we'll see.. im hopin for 430

 

they also said that it would be making 28-30lbs of boost.. you'd think it would make more than 420awhp