therock

iTrader: (2)

Thanks, I'll get the timing numbers tomorrow.

KySilverado

iTrader: (7)

I'd say too lean also. Good fuel and short pulls it would probably be fine. A long pull, get some heat in the cylinders and a little detonation and you are going to pop a piston IMO.

sixltrbtr

iTrader: (5)

I'm no expert by any means but i've heard 11.2 to 11.8 max on these engines. At least with a magnacharger.

Stoichiometric

iTrader: (10)

You probably won't loose much power if you add some fuel. It will buy you some knock resistance and keep things cool for extended pulls.

1Bear

iTrader: (1)

I'm with the other guy's on this one, would you rather the tuner have hurt feelings because you questioned his tune or you having hurt feelings because you fried a piston. Bottom line is it's your truck and your just asking to make it as safe as possible, even if you give up a pony or two to do it. I would think the tuner would respect that.

Also while heat is bad, it would really scare me running on the edge when cold weather hits!

shawnss

iTrader: (8)

wow. i wouldnt run it that lean.i run mine at 11PSI and in full boost my A/F is only 10.8 which i know is really fat but id rather be safe than sorry. When i run the bottle i run 110 octane and a 65 shot on 11 psi and my A/F is only 11.4 in full boost. id say 12.5 is way to lean. it would be good tune for a N/A setup

stock48

iTrader: (16)

I'd shoot for 11.8~12.0 at that boost level. What's the timing?

Raffman

iTrader: (9)

You could always add methanol injection, that would richen it up plus cool the charge!

therock

iTrader: (2)

OK, I took her out this AM with the Predator hand held in live diagnostics to monitor the spark and KR.

I let it idle warm up and took it out and made 3 WOT runs from a very slow roll to save tires into 3rd gear before running out of road.

"18.3" Spark.
"0" KR.
12.2 to 12.4 AFR, holding steady @ 12.4 as she settled out at the top RPM's before shifting.

The AFR's on the PLX were not touching 12.5 like on interstate on the way home from the shop perhaps because of the HOT afternoon 98 degree temps then and she may have not been at FULL temps on the first 2 runs. It was a 10:00 AM @ 85 degrees during the runs.

So looking at no KR and the spark do the numbers look any better to you guys?
There is no telling what else he did in the tune. I know this guy is very, very good at what he does. He is an engine builder also.

Look at his work. He tuned these CARS

therock

iTrader: (2)

After the 3 back to back runs its less than 1/4 mile to my garage and I eased it in. I took two plugs out to have a look see. They are the OE plugs with 45k miles and are right at a .040 gap.