Do I need to swap my BAP to run E85? Or buy return style fuel system? - Mustang Evolution

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Old 02-22-2018, 09:24 PM   #1
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Do I need to swap my BAP to run E85? Or buy return style fuel system?

I am having a surging issue. It seems tuner is having a problem narrowing it down. They did a compression test and cylinder balance test and no issues shown. I didn't have issues until upgrading my Throttle body. So far they have tried, plugs, O2 sensors, different TB, a few different tunes. I data logged and sent to AED and Shaun wouldn't tune due to the fact it had major knock activity and low timing in combination. However, all test are showing normal. They are guessing my issue might be a false knock from poor fuel. I run 93 normally from Shell.

Do you guys think I need to upgrade to use a return style fuel setup? Switch to E85? Anyone know how much a different fuel system would cost??? Is there recommendations? From what I read it seems Fore is the better option? I don't know much about cars, so any info would help.
I have seem some systems from beefcake and lethal that seem to be quite expensive, does anyone know estimate on install?? Can I just upgrade to a better BAP to run corn? If so suggestions?

Thanks for any advice guys
Phase 3 upgrade including CAI, Fuel pump voltage regulator, (648rwhp), 582 torque, Kooks LT headers with off road H pipe, Vossen CV3's, ID1000's, Steeda Heat Exchanger, BMR LCA's,relocation brackets, adjustable Panhard bar, Rear sway bar, Steeda Aluminum driveshaft, X-brace, Differential cover, torque box brace/frame rails, Shelby trans cooler, Mcleod RST clutch/lightweight steel flywheel w/SS clutch line, RP fluids, whiteline transmission bushing,MGW race spec short shifter,Ford racing twin 65mm throttle body, Pro Dyno tuned
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Old 02-23-2018, 10:34 AM   #2
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1. Go back to the last known setup before you had issues: Meaning swap the throttle body back and see if it fixes it.

2. False knock can happen from anything loose and rattling, so check your entire exhaust system, intake system, etc for anything loose.

3. Run 3-4 gallons of E85 and see if the knock goes away. You wont need any changes to fuel system or tune, and if the knock goes way then you truely are experiencing knock events.

4. Also, if these are questions your tuner cant answer for you... you need a different tuner.
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