I am attenmting to tune both banks. I can tell you I will not be doing any more boosting until I have it on the dyno, i/c'* plumbed with cold water, and TWO widebands in it at the same time.

Smart move going to Two widebands. I love my wideband meter but it doesn't tell the whole story. :(

You don't mean that you weren't running your intercooler when you blew #4 do you.
I know it was cold outside but you are still going to heat your air charge as high as 190*F(or even higher, I'm basing the temp readings on my own set-up at 13 psi) .......instead of 250*F if the outside temp were 60*F warmer.

Your intercooler should drop your temp by 100*F or so.

ya, no water in the i/c'*.

I will start building a new long block tomorrow. I picked up 6 used pistons/rods from a good engine that sat with coolant in it and pitted the bores. it has a good crank, too. I am putting all that in another block, one that had a bad crank. A little hone-job, some new rings and bearings, reseal it, and go. The heads are off yet a third engine. I will touch the seats and grind the valves to make sure they are fresh. My springs and rocker arms will go on, too. I won't even bother with a new timing chain right now.

Stock cam :?:

Ya, stock cam and 1.8 rockers.

OK so somewhat similar to my setup except you produce a bit more boost. What size pulley?

I agree with unmetered air entering somewhere causing most/all of your issue.

Places to check:
Around the I/C top bottom, core, ect. At 16 lbs you may not see the issue at idle.

Check the bottom */C gasket for perfect fitment, you may have a slightly larger opening than you need and have a spot cut out a hair to big

Loose the OEM H/Gs and bolts...MLS and studs will ensure your not letting any air in at 16lbs

And if I read correctly you are running 1.8s w/16 lbs???

I had a slightly larger slot cut into the */C and brought some unmeter air in under the I/C. I don't think it was a huge issue, but others will disagree.


Other than that, check and recheck, then check again....it sounds stupid, but this will make sure you have a great build and can rule that out. Then tune, tune tune, and turn the boost down for a little while, until the tune is right.

-Jeremiah