Seraph0

So I got my HPC coated .63 A/R turbine housing back and put it on the car this weekend. Ran some tests and see that the EGT is not nearly as high as with the old .48 A/R I have been running. Both cruising and WOT temps were affected. Seems almost a 50-100*C difference. Highest I saw the EGT go was about 840C towards redline of 3rd gear.

Ubermensch

Do you think its the size or the coating? By the way what is HPC?

94turboteg2

Nice, I'm thinking about going to a larger A/R. I always thought 0.48 was choking me on the higher rpms. And you can't beat the lower exhaust temps!

How is response?

Seraph0

Hmm... Never thought about the coating affecting the temp., but it sure could. I would think the coating keeps the heat in.. making for higher temps, but really am not sure.

And the .48 DEFINATELY limits top-end. There is a HUUUUUUGE power difference in just changing the turbine A/R. BUT... the .63 makes for a lot more lag. Well... Not a LOT, but def. noticeable. I get full boost at about 3300 now. Vs.. oh.. about 2600 before.

Hondas seem happiest with .63 A/R turbine housing.

TurboInteg95

hmm, that makes sense. the smaller housing was probably creating to much back pressure and heating things up.

Jared

Actually, the reason that it may have been getting hotter is because of your exhaust gas amount, you may have been out of that turbos efficiency range, especially since it had the small a/r.
later,
Jared