Well, I said I post my results, good or bad. Let's just say I was not ready for Steve. I ended up with 355rwhp@1 bar with very slow spool, and AFRs in the 10.5-10.8 range with some transient 11.0 numbers. That's around 100hp shy of my goal. That should not be a problem since this turbo likes 20-25psi, not 15.
Now, let me tell you why I am pleased with the results. First, you need to know that I did not get the car running until 30 minutes before the tuning sessionwas to end, after the car had been completely apart for a year and a half. The problem with that(besides the fact I had no time to check anything) was that I live 30 minutes from the dyno. Anyway after nearly destroying my new FMIC trying to get me car onto a borrowed trailer, I finally got the car loaded. Off to the dyno. I got there and was pleased to see that the dyno operator was a past daycare client of my wife's. He agreed to keep the dyno open until we finished(an extra 1.5 hours).
The key to why my car is such a challenge, is that someone else built much of it before I purchased it, and as a result, little things like 5 timing marks, or the fact that the fuel pump was still on the stock wires had escaped my attention. So, in a nutshell here are the issues that stopped us at 1 bar, and caused(I believe) the very slow spool of what should have been a very fast spooling turbo.
1- the EGT probe was later found to have not been installed in its bung (3/16th hole in the exhaust manifold), can you say boost leak ...
2- My spark plugs, NGK 11.5 were completely worn out, and corroded.
3- my fuel pump was on 16 gauge wires(I can't beleive I missed that)
4- I had to run both of my fans (~60 amps)
End result was that at about 5000 rpm my fuel pressure dropped from ~60 psi down to ~40 psi, meaning we could not increase boost. We also were severely lacking ignition energy do to the large draw from the fans.
Analysis; first we will be plugging the hole in the manifold, replacing the pump wiring with 8 gauge, new plugs, and probably using a new device available that will drop the draw from the fans from 60 down to 15 amps w/out giving up fan performance. I think I did not encounter the fan/amp/draw problem previously due to the fact that my fans rarely come on while driving. So, that is a problem primarily limited to the dyno.
If the spool problem is not fixed by these things, I will have to assume the turbo is not a T66 .81 q trim as it was sold to me. I will dis-assemble it, identify it correctly, and sell it. If that is the case I will replace ot with a PT67 GTQ .81.
Next if the fuel delivery problem is not solved, I will switch to dual high pressure Walro pumps, one to each rail.
The last possible issue was the IC. Steve thinks it is too long(26" wide core, 33" overall), I will test this, and report back. I do not agree with him on this, but we shall see.
Anyway, it's an OK start, but we have a way to go. The car will be ready for Laguna Seca on the 28th one way or another. Thanks to Dave for setting this up, and to Steve for the tuning. Later, Carl Byck

 

congrats on getting the beast running and initial tune on it. What was the rwtq reading?

I'm definately going down to Laguna Seca for that all day Mazda event. Should be some great cars down there.

-Mark

 

Hey Carl,

I actually just got back from lunch with Steve. Bummer about your fuel and exhaust issues. I thought mine was well sorted only to find that I had a few hicups as well. I am in the process of changing them as wel speak Hopefully I'll get it ready for SS7, but I have a lot of work to go.

I'm sure it'll scream once it's all sorted

-C

 

Peak torque was around 275. Chris how much effect on spool do you guys think the missing probe/hole in the manifold may have had? I may also use a "boost a pump" of some sort to keep the voltage closer to 13.5 vts( who knows what it was getting previously...) Chris, are you still thinking of changing turbos? If so call me

 

I would think significant.... that being several hundred RPM.... but that's just guessing on my part... Steve really likes the HKS manifolds and was surprised to see that happening.

I think for now I'm gonna keep my setup. I'm curious to see what my new manifold will do. I think I have improved some aspects, but won't know for another month or so when I get it going again.