How much horsepower will the stock fuel system support?

Gray Brick · March 06, 2015, 02:19:20 AM

Where does the stock Ecoboost Flex/ SHO fuel system max out?
What about with 100% methanol?

Trying to do a little mod planning.

crash712us · March 06, 2015, 05:31:01 AM

Just a little over 400whp on meth. So that about 500hp at the crank.

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SHOdded · March 06, 2015, 05:43:38 AM

Isn't Mike's SHO still on the stock fuel system (with 100% methanol of course), Chris?

bpd1151 · March 06, 2015, 07:19:09 AM

Quote from: SHOdded on March 06, 2015, 05:43:38 AM
Isn't Mike's SHO still on the stock fuel system (with 100% methanol of course), Chris?

Yes Manu, that is correct.

Other than the addition of 100% Methanol, my fueling system is completely bone stock.

Factoring in the 23% AWD Drivetrain loss, I am at 800hp (on highest tune file).

The stock system is much more stout than has been lead on by others previously.

AJP turbo · March 06, 2015, 01:44:11 PM

I don't know much about meth/methanol but when I run 18-20 psi below 3000 RPM fuel pressure drops to unsafe levels. I will only lean out slightly but having fuel pressure at 500 psi is not stable for direct injection and probably unsafe.

So I only run 15-16 psi below 3000 RPM then above that I'll run 18-20 and fuel pressure stays above 1000 psi. It should be targeting at least 2000 psi fuel pressure so that goes to show how bad it drops off. Even if your AFR's are ok it still shows an inadequate fuel system. Fuel pressure is really important especially in direct injection. A lack of fuel pressure can lead to inconsistent fuel spray.

I think the high pressure pump produces more flow with increased RPM. I've ran up to about 24 PSI at about 5000 RPM I didn't lean out but fuel pressure was scary low.

BiGMaC · March 06, 2015, 02:16:49 PM

Quote from: ajpturbo on March 06, 2015, 01:44:11 PM
I don't know much about meth/methanol but when I run 18-20 psi below 3000 RPM fuel pressure drops to unsafe levels. I will only lean out slightly but having fuel pressure at 500 psi is not stable for direct injection and probably unsafe.

So I only run 15-16 psi below 3000 RPM then above that I'll run 18-20 and fuel pressure stays above 1000 psi. It should be targeting at least 2000 psi fuel pressure so that goes to show how bad it drops off. Even if your AFR's are ok it still shows an inadequate fuel system. Fuel pressure is really important especially in direct injection. A lack of fuel pressure can lead to inconsistent fuel spray.

I think the high pressure pump produces more flow with increased RPM. I've ran up to about 24 PSI at about 5000 RPM I didn't lean out but fuel pressure was scary low.

I must have missed it... What kind of turbos do you have on your 3.5 TT GDI?

AJP turbo · March 06, 2015, 02:18:49 PM

stock

FoMoCoSHO · March 06, 2015, 10:22:44 PM

Quote from: ajpturbo on March 06, 2015, 01:44:11 PM

I think the high pressure pump produces more flow with increased RPM. I've ran up to about 24 PSI at about 5000 RPM I didn't lean out but fuel pressure was scary low.

That is correct.

My fuel issues are on the 2-3 WOT upshift and the 3-2 WOT downshift

A couple of times I got a +7KR and shutdown.

I've down blended my mix to 15% and all is happy now.

Can't wait for some meth.

Gray Brick · March 07, 2015, 12:13:59 AM

Does anyone have a formula for the amount of fuel added with methanol?

crash712us · March 07, 2015, 05:30:29 AM

Yes Manu. But that's the only thing stock on Mikes ride.

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