Has anyone here tried converting a force inducted late model LS'x or LT'x engine to E85 fuel? I have some question about the injectors and compression?

On 106 OCT, engine made over a 1000hp and now with e85 its cutting out and leaning out. Fuel pressure stays constant, does not drop...

I've had the pleasure of dealing with a blocked exhaust pipe and the way the engine runs now brings those memories up...like its choaking...?

At least I have 5 months to fix it...

 

What does your wideband show for AFR in closed loop and WOT?
What are you running for an ignition system? How much boost?

 

9,0-22 AFR and .5 degree of retard per pound of boost (20psi)...blew a head gasket failure today. I'm runing a cat on it for sound quality purpose and a week ago it colapsed.

 

today they fixed the fuel pressure drop...it's gona cost me a few hours of labor. Dave found a small crack on the intake manifold. I may have over tightened a bolt and cause a crack on it. DUM DUM!!!

Aluminum can be welded and grinding down the crack and TIG filling it isn't a problem...durability...what do you guys think, weld it or spend more cash on a used one and more $$ on port and polish...AGAIN!

 

Sounds like you may have had serious fueling errors then.
A wideband is a lambda sensor (with 1 being stoichiometric regardless of what fuel is used). When a wideband is in the 14.7:1 gasoline mode it's just 'reassigning' 1 lambda to display 14.7. Therefore in gasoline mode your wideband will still read 14.7:1 when burning E85 at stoichiometry which is around 10:1. If you tuned it to actually show 10:1 in gasoline mode it would be running very rich. I can be confuing at first, just notice your fuel trims and go off them for achieving stoich since your o2 sensors will still be accurate.

 

...would you guess or think that this leak could be the reason or something more deeper...? Last three sessions we had the initial tune from fast and diablo tuner was good. Motor ran, it ran a little rich but the fuel pressure would drop to 20-30lbs at 10psi. After two days of testing and tuning he menaged to blow the head gasket and "find a crack on manifold". I was hopping installing bigger fuel injectors would help...30-50% more flow...50-70lbs injectors.

 

I forgot to mention that there is a power issue as in volt...when going to WOT, volts drop by 2...alt tested good and bat load test was good...

issues from HELL!!!!

 

I just bumped my boost to 9psi and my fuel pressure dropped from 53 to 30psi @ 4500rpm. Injectors aren't maxxed out so it's the fuel pump. Supposedly walbro's only flow 530rwhp forth of fuel for forced induction applications, which is exactly what the dyno chart appears to have been "limited" to. Your fuel pump too may be maxing out.
Was your tuner power tuning after he knew pressure was plummeting? if so thats incredibly stupid.

 

Yeah he did which is what I think why one of my shopping cart contants is a new set of head gaskets...I'm runing Aeromotive A1000...

 

I don't believe the a1000 is going to be enough to support your goals on e85.