threads like this remind me why i keep my car simple LOL.

OP: sounds like you will need more than a 255.

 

Lol the mods/money definitely keep snowballing. Thanks for the help guys

 

12.1 at wot on E85 didn't know it called lean tbh.i thought it's normal and that's what I got. Stock 9 turbo 1000 cc and all bolt ones. Just FYI.

 

I dont think I would personally trust a 255 on e85 with any turbo larger than stock.

 

I decided to do a walbro 450 with the dual voltage rewire. Car is coming together and will be tuned soon.

 

Sorry for the revival of an old thread but rather than start a new one I thought I would quote from this one.

I'm running a BBK with FIC 1100 high impedance scaled to 680 mated to a punched walbro 255.

I was doing some road tuning tonight and believe I'm encountering this very thing. Adding fuel via my fuel table, basically richening it up from 10.0 to 9.0 had zero effect. See image below.

Other than a failing wideband sensor or leaky exhaust (doubtful) is there anything else that can throw the AFR out of whack?

Can scaling or latency have this kind of impact? I stopped tuning the AFR when I saw the upper powerband so this isn't "tuned" I know 12.5:1 is stil safe on E85 but don't feel comforatable running it at its limit. THoughts?

 

One more thing... during the first few pulls I noticed I was lean so I added fuel across the entire powerband. Oddly enough chaning the AFR one full point had zero effect on the HP and TQ. Does this pass the smell test?

 

if you add fuel and there is no change then most of the time it is the fuel pump.

What are your IDC's?

btw, I haven't seen you on here in awhile Jeff...

 

Fuel pump sounds like the culprit. I also ran out of fuel around the same power level. I'm at 460whp and running out of fuel with 72% IDC.

 

Gentleman, thanks for the replies! I can see my IDC go up but it has no impact on AFR. I'm an old school DSM guy so I try not to go above 80% IDC.

I hate being in this position because if I do the fuel pump I'll need to do an FPR and then I might as well swap out fuel lines and such. I absolutely hate changing fuel lines because of the added risk of leaking and fire. This might end up being a winter project.

I see alot of people saying simply swapping out the feed line to a -6an line will be plenty for 500whp but as mentioned above that makes me nervous.

I would guess there are tons more people just like me sitting at this HP level and running out of pump. I wish there was an easy fix.


Bryan ... its been a minute ... but I'm still abusing my nine! I made some career changes that required me to move and invest a crap-load more time into professional development but I'm getting back into my normal rhythm again.

 

I'm with you and staying right where I'm at. I try to keep my car as OEM as possible. Yeah, I could make some fueling changes, but that opens up more possibity for problems/failure. I like to be able to find parts relatively quick and somewhat cheap. It's a budget build LOL. I've gone the crazy build route before, including the fuel system. It was a nightmare, getting everything to work how I wanted and what I felt was safe. I'm too old for that crap now. haha
I don't need more power, to be honest, so it's really not worth it for me. It's tempting, until I start the to-do list and add up the bill LOL.
Gary and I decided we'd tune the car to what it will do and go with that.
Also, I'm with you: i don't like over 80% IDCs. Nooooo way. I don't really like the way the car idles and drives on pump, though....

 

Jeff, check out mrfreds threads around running the 400's on stock wiring and stock FPR:

https://www.evolutionm.net/forums/ev...6-testing.html

 

I'm pretty darn close to 500whp. I made 440 on a mustang dyno, using a 255 and ID 1300's, fuel is never a problem. Usually around 10.9 Wot, which is perfect imo.

Wired right to stock fuel pump wires, never had an issue with it

 

Walbro F90000274 E85 450lph Fuel Pump (not the F90000264) is the best pump on the market for under $200! Ive ran the 255, and also the DW300 which was absolute Garbage(all DW products are IMO) and nothing even comes close to the Walbro 450! They arent as loud as the DW300, and Radium Engineering makes some great compatible parts for it.