'66 Slant Six Turbo Build

Just go done with the first round of dyno tuning.

Slant six + GT32 =

440.6 lbft @ 3808 rpm

and

330.7 Hp @ 4057 rpm

Not too bad! I haven't got her weighed yet but I think with some traction that'll make for a sub 12s time slip. No?

We could not get a full run to 5k or 5.5k rpms because of boost creep. The numbers above were at 16.5 psi and at that point we got a little ping that we could not tune out. AFR was about 9.5-10.5 down at 1k rpm and 12.7 when we hit peak torque. Slightly lean on top...

We're thinking we could fatten it up with a bigger jet to alleviate the ping but time ran out and it probably wasn't the best idea for low end power.

Anyhow, the turbo is internally gated so it needs to be machined out and bigger waste gate created. It is also a twin scroll with one side pretty much isolated from the waste gate. I might machine the scroll out a bit and open the circuit up to the waste gate. That will cost me some spool but it had 10 psi before 3k so it's spooling fast enough :-D

I'll get a scan of the dyno plot later on. I'm not terribly upset we could not get a full pass because at least we know how much power it can make - we probably only left 15-25 Hp on the table. Until I get the boost under control I will mix in av-gas for insurance.