Close, depending on injectors...If you get 1200cc injectors then your pump will max before the injectors. The single and 1000cc's, the injectors max before the pump.

 

Is this at stock fuel pressure? I would think if you increased fuel pressure, the pump would max first. Anyway, I'll find out when we tune it on the 25th.

 

I am going off of what my tuner told me, this was for the 8/9's but none the less Evo's. He has done tons of them, and since Minnesota is plentiful for E85 he has done lots of E85 cars so I base this off of him.

Here is what he gave me for numbers, mind you this is on the Dyno dynamics heart breaker style dyno.

850cc 335-360awhp
950cc 375-400awhp
1000cc 400-425awhp
1200cc 475-510awhp

Also I am sure if you raise the fuel pressure it might be close, but I would still think he meant the fuel pump will max after the 1000cc's on E-85, which is what you are going to run I believe.

Good luck on the dyno by the way I go on the dyno Tuesday with Cosworth Cams, AMS UICP, Perrin 3 port, New fuel pump, Deatschwerks 1000cc and some E-85 so I don't think I will be maxing either of mine with the stock turbo

 

Here is what he said about the fuel pump/injectors, I found the email.

800cc are good for around 450awhp on my our dyno on pump/race gas. On E85 probably only good for around 340awhp, which would work with stock turbo, but not enough for the FP Red. Usually on single Walbro 255HP fuel pump car on E85 that is going to make in low to mid 400s we would run 1200cc injectors. 1000s are good for a tad over 400, but they will max a little before the fuel pump. With 1200s the fuel pump maxes before the injectors.

 

Yeah, I think we're talking the same thing here. 400 on a low-reading dyno could be 450 on a dynojet. If 1200cc DWs were out, I would have them, and if a double pumper were out, I'd have that. I'm just thinking that adding fuel pressure can overcome a maxed injector. Now that may also put the Walbro over the edge though. We'll see.

Where on his dyno does the Walbro max out with 1200s?

 

Not sure, you can try PM'ing him, Screen name is DB Performance.

I would say somwhere around 500whp.

 

not only will you guys max out your pump and injectors with E85 (since it uses 25% to 30% more fuel to run) once u get into the 400whp, but you will also max out your whole fuel system. Fuel lines etc...

Don't get me wrong, its the magic juice! it just takes more than injectors and a dual pump to do it right and gain good numbers.

 

Fuel lines? Which ones are you referencing?

On our mustang dyno, single pump maxes around 450-470, depending on turbo on E85.

We've had 570whp so far on double pumper, stock fuel lines, 1450cc, stock FPR, aftermarket fuel rail. This was on a Evo 8

 

Yup, this is more what I have heard and my tuner who has done multiple Evo's and other vehicles on E-85 has told me. I was going to say maybe a new fuel rail or maybe a new FPR but I have never heard new fuel lines for the power levels I have looked into.

 

What HP do you think the single Walbro and 1000cc injectors would max out at?

 

I maxed out a Evo 9 on a 54trim, on E85, with RC 1kcc and single pump at 420whp a couple months ago.

 

Cool, thanks.

 

Hey, I heard there are a few tricks to improve the performance of a Walbro. Can't remember what they are though. Do you do any kind of modification to your fuel pumps?

 

There's really not much to mod with the Walbro. The only that can be done is to force the pressure relief valve shut. The only effect this has is to improve fuel flow at very high (e.g. high boost) pressures.

 

So there would be no reason to consider doing this even if I were close to maxing out my system on E85 and needed a bit more pressure delivered to the injectors?