[parish8]

I have mentioned it before. I think any complex fuel system should have a safety set up. Mine cuts power to the coils if the a/f ratio gets too high under boost.

This may not have caught your issue if it was a distribution issue but would have saved the motor if it was a meth or fuel supply issue.

Anytime I am helping someone tune an aftermarket ecm I turn on all the safeties I can find. Fuel supply issues happen all the time due to a wide number of causes. Then add a whole 2nd fuel system and that likelihood goes up.

[gtfoxy]

I’m sorry but I’m laughing so hard picturing the wife running away screaming.

[L78toLT1]

Originally Posted by Umbriel

No doubt it is a distribution issue, I melted a #7 piston on an LS1 using nitrous for the same reason. When I decided to build this car I did port injection and can support 1500hp on E85 now so I won't be blowing anything up because of fueling issues.

I agree it's a distribution issue, but why is it nearly always cylinder #7? Isn't #8 is slightly farther from the throttle body?

[Umbriel]

Originally Posted by L78toLT1

I agree it's a distribution issue, but why is it nearly always cylinder #7? Isn't #8 is slightly farther from the throttle body?

Good question that I can't answer.

Sent from my SM-N986U using Tapatalk

[KingLT1]

It's always been that way since LS engines and my guess it has to do with the Intake manifold designs. There must be some sort of turbulence in the plenum that causes that cylinder to get more air and it seems to run hotter as well...so more air and less cooling.

[JANNETTYRACING]

Originally Posted by Prochargedgen6

BTW is was just one cylinder, #7 everything else was fine,

This is a result of relying on Meth injection for fueling support.

You are not the first and won't be the last until people figure out relying on a Fertilizer pump to supply fuel to your engine through a single injection point can't possibly distribute fuel equally to all cylinders.

And Direct injected engines are not designed to carry fuel vapor in the intake and combustion system.

XDI fuel system and injectors with Fore Innovations low side fuel system feeding it, is the only way we will build a Direct injected engine at these power levels.

I hear all the time Man that fuel system is expensive, Deduct your blown and engine cost, and meth system cost and you come out ahead.

End Rant.

Ted.

[ZO6Ted]

Originally Posted by KingLT1

It's always been that way since LS engines and my guess it has to do with the Intake manifold designs. There must be some sort of turbulence in the plenum that causes that cylinder to get more air and it seems to run hotter as well...so more air and less cooling.

And to note an MSD manifold. What I'm wanting when I do P.I.

[ramairroughneck]

I just don’t see it being a methanol distribution issue. There are a million and five people running methanol and most are not direct. A MSD is not restrictive or a particularly long runner intake. If your meth tank was full and your fuel pumps had a sufficient level to keep them primed, my guess is your fuel system was on the ragged edge of being capable enough to support your setup. The lack of miles and the cooler air requiring more fuel leads me to believe you may have not ever had an adequate supply for this setup. Prochargers have a sharp power curve that has a very slim peak. They don’t draw as much fuel early on or even through the mid range. It could very well be that insufficient fueling wasn’t discovered on your tuning day. It’s all speculation though. Really everyone of us could be wrong and I’m fully onboard with the others notations about using bigger injectors or secondary supplemental injectors as a safer alternative for a powerful build like this.

[ScatPack]

This is why I want a ZL1 and not an SS then add boost.

[L78toLT1]

Originally Posted by ScatPack

This is why I want a ZL1 and not an SS then add boost.

Not a bad idea, however you can boost an SS to ZL1 power levels and maintain stone axe reliability. The OP was pushing well beyond these levels.

[arpad_m]

Originally Posted by L78toLT1

Not a bad idea, however you can boost an SS to ZL1 power levels and maintain stone axe reliability. The OP was pushing well beyond these levels.

Not to mention that the exact same problems will come up with the LT4 except at higher power levels... after all, who in here leaves their ZL1 stock?

[Joshinator99]

Originally Posted by ScatPack

This is why I want a ZL1 and not an SS then add boost.

Add an F1A-94 to a ZL1 with the same fueling and watch what happens...

[laynlo15]

Originally Posted by Joshinator99

Add an F1A-94 to a ZL1 with the same fueling and watch what happens...

Geeezzzz, let me guess. Its behind door #7.

[95 imp]

My vote is it leaned out too.

IMO, the manifold is designed to be dry flow. Try to make it a wet flow and you will get fuel separation/fall out/distribution issues.

"Just because you can doesn't mean you should"....