Air distribution , IMO. I've run double the boost with more timing at the same A/F ratio and fuel type. Never burnt a ground strap,,,,, ever! Like the others have said checking the injector is easy.

 

All of the above

I think you are too lean if your in the 12.0-12.4 afr range over 10 psi . Just looking for trouble. I would shoot for 11.2-11.5

Any chance you can run e85 ? Much cheaper than the race gas and IS badass on the boost.

 

There is no need to run anything with c16. I was running 25 psi with 20+ degrees of timing with IAT's at 200 degrees when I was A/A. A/F was around 11.5 on NGK 9's and never showed the first sign of detonation. There is something wrong in that cylinder or that injector.

 

Keep in mind this is not pump gas. I run pump at 11.5. This is C16 and C16 likes a leaner tuneup.

I am going to richen it up a bit either way. Going to a larger injector and more turbo.

Mike

 

Aside from what was posted that there is no need to run alky with C-16, C-16 is designed to run at high inlet temps. I would not be running a supplemental fuel with it. Either run straight meth or straight C-16. However if you keep hurting the same plug/cyl then you probably have a ring that has lost tension from the original improper tune up. That will allow oil to get past and into the combustion chamber contaminating the fuel charge causing repeated detonation in that hole.

 

That hole does leak more than the others and the compression is down a little. However, the plug has never shown any sign of oil. Valid point though.

 

Sorry to hear about your troubles. I hope you get it straightened out soon.

 

I've run 30psi at 12.1 never a issue

 

Little oil in that cylinder will burn hot. Makes sense. Would not take much while it is out to pop out that piston and check the ring gaps.

 

The engine is not out, just the heads. I am pulling the engine in December and will freshen it up.

Mike

 

Kind of moot at this point since the heads are off, but I wonder if it wasn't pushing water when it was lean because it wasn't making the same amount of power. I know when I was tuning boosted cars, if it was leaned out too much it was actually slowing than when I richened it up.

 

It got faster as we leaned it out. The average AFR over the fastest pass was 12.0.

Mike

 

But at the expense of eating plugs?

 

I think the issue in that hole was distribution. I am going to disable the meth on C16 and run from the injectors alone for fuel. I am also going back to a factory plastic intake.

Mike

 

Might want to look into the distribution issues on the factory plastic intake as well. I believe #7 is a known lean cyl on the LS1 manifold too. Not sure which mani your using though.

Good luck, keep us posted.

 

Currently a Typhoon. I was going to go back to an LS1 though.

 

Except that its been proven that 7/8 being lean has nothing to do with the ls1/ls6 style intake manifold. It has to do with the cooling system. Been proving time and again, including people who have swapped the intake manifold 180 degrees and 7/8 were still the lean cylinders.

 

I have both the factory 4 port steam vent kit and the Kurt Urban kit. I was using the KU with the Typhoon.

 

And, when I say distribution I mean the fact that I am fueling from the injector and two meth nozzles. If that rear cylinder is not getting its fair share of meth, and I am fueling pretty lean based upon this mix...that cylinder is going to be very lean. So, I am going to pull the fuse on the meth when I am running C16 and dial in the fuel strictly from the injectors.

 

Mike did that hole ever show signs of being leaner prior to nipping the plug?