When trying to tune my car at 5500 rpm the a/f ratio slowly sleans out from 11.3 all the way to 13. I've rescaled injectors to trick the ecu and tried to richin it up. Nope. Its not having it. Fuel shouldn't be an issue, but it is.

Mods: Full Blown Duel Pump (Walbros, duh), 1200cc precision injectors, AMS GT3076R turbo kit, 272 cams, FMIC, UICP, LICP.

Do you have any other ideas on what can be done? It tuned out perfectly on 91 oct, but when going for e-85........ Yea.... Not so much.

 

What are the IDC's telling you?

 

Is it just when your on E-85 tune ?

Maybe a clogged injector(s)?

 

I've got 1200cc injectors scaled to 460 or something and I can't even hit 400hp without going lean.... as soon as it hits 5500 rpm she leans out more and more.

 

Brand new injectors, we tuned 91 and it was just fine, then drained the tank and put e-85 in.

 

Again, what are the IDC's telling you?

You obviously have a fuel supply issue somewhere when the system is being asked for a higher demand.

Are you sure your secondary pump is working/on?

 

What kind of FPR are you using? What are the injector voltage latencies? +1 on the IDC's.

 

u may want to check your fuel filter for clogging. u may want to check if your 2nd walbro is activating.

 

We confirmed both pumps are coming on, even with that said one pump alone will supply enough flow for 400whp on E-85.

Pulled the supplied fuel filter from the Full-Blown setup out and still the same issue. The factory fuel filter in the tank is no longer there as this car is now using the Full-Blown dual pump hanger.

Pulled the E-85 out of the tank and put the 91 pumpgas back in and the tune for it to see where a/f's would go. When boost came on it was in the 16's. Injector pulse width was the same as a known good run on 91 of 11.3ms @ peak torque and about 9ms @ redline...didn't run it out to redline when I saw the 16's a/f on the last run for obvious reasons.

The pulse widths I am commanding on the E-85 are staggering to get it to stay rich and it won't. Somewhere in the 22ms range around peak torque and out to redline and the a/f's are fine at peak torque, but at 6500 out to redline it steadily climbs into the 13's on a/f.

Gonna change out the FPR and test it next weekend.

 

9ms at redline? 16:1 afr? At 7k that's 52% IDC

Are you sure your wideband is reading correctly?

Out of curiosity, what does the narrowband 02 sensor say?

 

9ms at redline was from a known good run with 11.3 afr's in the log. This same map was put back in for the 91 octane and it showed the 16's well before redline with the same pulsewidth.

This car has an AEM Uego gauge unit that was just installed before tuning and I am metering at the same time with an LM-1 that is being fed directly into the Evoscan.

Don't have any narrowband readings.

 

I'd doublecheck the NB just to be sure and you'd be in the .9165-.9365v range.

The only time I have ever seen this before is a crack in the vacuum line on the FPR and the ratio wasnt there. It was crazy because I was actually able to tune the car without rising rate, but it pissed me off to no end when I realised what was causing the issue.

1200s on E85 would be in the 696 range normally and still be good out the top (I have done this more than once so I have the combo down).

Its 9ms at what RPM exactly?

 

You said the IPW was the same now as well right? So 9ms for 11.3afr and now it's 9ms for 16afr?

That is impossible no?

 

Man, I wished I was local I would like to have a crack at this. I am fairly certain you have looked at the basics, maybe jump back to before the problem and start testing what was changed. Was this problem there before or did it just start since the injector install?

 

Has anyone ever seen a W/B to N/B comparison table?