falls flat on the face!

[Enes]

a friends car..

got quite a bit of work done on it, runing e85 right now.


driving normaly car functions just fine..

as soon as it hits boost it falls flat on the face.. no go anywhere.. just sputters and runs lean....

fuel most likely?

we checked couplers, has 38psi on the fuel preassure gauge when the car is off..




checked fuel pump, its a 255HP and its pretty quiet...

any ideas?


-E

[Enes]

oh yeah i forgot to say it runs lean if it starts building boost...

he has new 1100+cc injectors and new 255hp pump... old FPR.

-E

[JET]

How is he tuning it?

[Enes]

dsmlink and wideband

[Enes]

if its running lean, its fuel issue pretty much...

fuel pump
injectors
FPR


thats pretty much it right?

fuel pump builds enough pressure and the car drives nicely all around
except when it builds boost.

Turning the screw on the fpr makes preassure go up and down nicely. only went up to 45psi not higher because his screw is also bent so it couldn't tighten it any more.

we removed the boost line off the WG so it was only runing 17-21 psi (on the spring only) with same issue

[DBMajik]

What's the global set at on link?

[Matt D.]

Is the vacuum line hooked up to the fuel pressure regulator and is it seeing boost? Might be time for some diagnostic dyno pulls.

[Enes]

yeah, all the vacuum lines are hooked up right.

intake manifold to bov
intake mani to a T one goes to boost gauge the other to FPR
intake mani to a MBC to WG

all lines there and tight.

its completely confusing me what it could be.. and the global setting is correct, the car idles perfectly.

-E

[carltalon]

Do you have the global set for E-85 or gasoline. You can send me some Logs I'll take a look( carl_talon@hotmail.com or AIM.) Im getting pretty good at this E-85 stuff.

[Halon]

If you know it's running lean, then that would be the first thing to go after obviouslly. My car was running rich when I first went to E85. I compensated too much, and just like yours, it would flat out sputter and fall on it's face under any sort of boost. The number to aim for on E85 seems to be 12.0-12.5 from what I've gathered. From there, start adding timing instead of leaning it any further. How lean is he?

[Shane@DBPerformance]

I wouldn't run E85 at 12.0-12.5 unless you are really trying to push it to the edge. E85 isn't that consistant of a fuel.

As Carl mentioned, did you set the globals up for gasoline or E85, they would be much different. What are his LTFT and STFTs at? Also, if it is misfiring, that will show as lean on a wideband, because the oxygen doesn't get used up.

[Halon]

What are you tuning cars at? I run mine personally at 12.0, and that is a number that I see a majority of people on the link forums are aiming for as well. If he has a wideband like the original post mentioned, and a functioning knock system, he should be able to monitor if the mixture changes.


Like mentioned before though, what are his deadtime and global settings at?

[carltalon]

I've been aiming for 12.0:1. I've gone as high as 12.5:1 without any knock at 21 deg timeing. I watch it pretty close everytime I fill up incase the fuel has changed.

[Shane@DBPerformance]

Since now is the leanest time of year for E85, then I can shoot for closer to 12.0:1, but if I tune a car during the other mixtures, then I don't want to be too lean when it goes from 70% to 80+%. And I can't run customers cars right on the edge, because 95% of people don't monitor their stuff like DSM guys do with DSMLink. Most cars also don't have a knock setup as good as DSMs or any at all to save the motor.

[Enes]

It ended up being a FPR. problems went away after replacing that stupid old thing, which i told him to replace last year it was some pos from ebay i think.

[Matt D.]

Do I get a cookie for being closest to resolving the problem?

[Enes]

I already took the bolt out from top of the FPR since it was bent... engine movement but strut bar stays on the same spot and doesn't give in, he needs to get front / rear engine mounts even tho he is AWD.

I want to take it apart and see what failed in there, all fpr is a big spring inside anyways with chambers

[Halon]

Good to hear you figured it out. Does that mean there's another Blaine DSM running on E85?

[Enes]

no, this is Edina dsm...

Blaine dsm will be running E-85 as soon as I take the engine out, replace bearings and put it back in, right now its just running the dust on it.

but i do gotta say, damn that car MOVES... it sounds like a freaken airplane with that 3065 in there and open WG to the atm.

-E

[Halon]

Nice, i fill up on e85 at the holiday right there off Central all the time. Let me know if you ever need a hand, as I'm only blocks away!