1979transam

iTrader: (19)

Recently just got my car back together, and now have ran into a wall. I'm new to this stuff so i would like some of you guys imput on the situation, My current setup is:

LQ9 408 10.4:1 Compression
GM LSA Stock Casting Heads
GM LS9 Head Gaskets ( Copper Coated )
Holley High Ram Intake
91mm Turbo
FIC2000 Injectors
Magnafuel Pump
Holley Secondary Pump
Tuned With HPtuners on E85..

Had the car on the dyno when tuning and it blew a head gasket, thought i diagnosed the problem but i guess i was wrong, Im guess i was experiencing head lift as i did this weekend at the track. Was about half way down the track and the car started the shake so i backed out of it and clicked into 3rd and it then blew out a fire ball, that resulting in melting the head between cylinders 3 and 5 between head and block and also resulting in loss of oil pressure. Pulled plugs and plugs #5 #6 and #8 are all missing the straps and covered in oil.

I'm running the BR7EF plug from NGK gapped at .022, my A/F are tuned with the lambda ratio and are right around 7:5 to 7:8 with approx 14 degrees of timing. And im pushing 22lbs at my max boost

My question is has anybody else experienced this problem, iv been told by several boosted local guys to just get away from E85 and go race gas, but i'd like to get some other peoples input on this issue.

Thanks,
Billy

smokeshow

iTrader: (17)

Sounds to me like it might be wanting more fuel than you're giving it.

allout06

iTrader: (11)

in for info..

1979transam

iTrader: (19)

Man it should be getting plenty of fuel it's got a magnafuel 750 as my primary and a Holley dominator as my secondary I use for under boost

allout06

iTrader: (11)

Ur fuel system seems to be up to par... thats weird. . Im wanting to make 22psi on E85 As well.. same plugs and gap.

gm-ntmr

iTrader: (1)

Fuel line size feed an return an base pressure
What type of regulator
Have you tested the e85 to see the percentage it is
We have several stations in our area and they are all different with the best being about 76%

JoeMama's GTO

iTrader: (3)

Have you seen the E85/FIC2000 injectors thread? Probably worth a read since it sounds like the fuel is mysteriously not making it into the engine.

silver_82

Have you verified to make sure the timing is accurate?

1979transam

iTrader: (19)

Regulator is aeromotive and the timing is accurate. Joemoma I will read up on that thread thanks

Blown06

iTrader: (32)

what is the fuel pressure at 22lbs of boost?

smokeshow

iTrader: (17)

Are you just commanding 7.5-7.8 AFR but not verifying it?

stevieturbo

I think what he's trying to say is 0.75-0.78 Lambda

ie 11.0-11.5 on the gasoline scale ( not the a wideband gives a **** what fuel you're using )

blackonblacksls

iTrader: (1)

If it's murdering plugs has to be detonating or something.

Just lifting the heads wouldn't kill plugs and such

allout06

iTrader: (11)

Are you tuning this yourself?

1979transam

iTrader: (19)

Yes we are commanding the AFR and Stevieturbo thanks for correcting me there. Your are right it's 0.75 - 0.78. It def has some detonation 3 of the plugs are completely gone. The question on the fuel pressure I'm really not sure. I know at idle with both pumps running it's roughly 60psi. I'm not tuning this, local tuner is doing it for me

moehorsepower

iTrader: (3)

Detonation will seek and destroy and yes it will lift heads too..

n20z28

iTrader: (3)

I'm using same local tuner I made 833 with a1000 and junkyard 5.3/s480 we get our e85 from same station... my timing is within one degree of his... I'm using Bosch 160s and a driver and still going strong

1979transam

iTrader: (19)

I'm aware that detonation will seek and destroy the engine, I'm just trying to figure out why its detonating. I thought I had everything safe enough not to have any issues at least for awhile. Guess I just need to steer clear of e85 and go race gas...

asubennett

iTrader: (6)

I believe you should pull your injectors and inspect each of the tips. I would bet the three cylinders that the plugs are gone the corresponding injector is gummed up with a black tar like substance.

albersondh

You have verified your WOT AFR with WBO2 or just commanding x AFR and fingers crossed? Seems like most probabale cause is lean. Based on your findings I would be so hung up on a lean condition that if one WB02 told me g2g at WOT; I would double check with another WB02.... Dont blame the E85, its very cheap and easy to verify ethanol content, quick fuel makes a simple graduated baret that works like a charm. I did it this way for years before going to a permanently mounted solution with zietronix display and GM FFV sensor.