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Hi
Ed,
Thanks
for the analysis.
> Sorry to hear about blowing another turbo,
John.
I'm doing this destructive testing for the sake of all. The
other guys will now all chip in and buy me a new
one. Right??? Yea. I thought not. :(
> overheating the unit which would
eventually lead to the turbine/compressor wheels failing.
That's what I think
happened.
>the stock waste gate
has trouble venting enough exhaust gas.
That's for sure. I had the wastegate fully open and was
limiting boost by throttle. I have Rusty's pop off valve set around 8-10 PSI,
and I also have a half inch bleed from the intercooler which probably dumps a
lot of pressure too. Better to have a decent wastegate and give the turbo a
break.
You have not mentioned any problem
holding the boost under control, so the problem could be more due to a continuos
heat load
Yes. There was no sign of creep or surge. It was steady at 38 MAP
for over an hour. A nudge of the throttle and it would go up or down a couple of
inches smoothly. The compressor map didn't come through, but I've seen them and
know what you mean.
A different turbine housing with an larger
A/r and external waste gate (and now we are starting to talk additional
weight) OR the modification offered by the Australian firm opening up the
turbine housing as well as the internal exhaust gate port would be something I
would strongly consider.
That's
my next call. I like having a lot of power, so I'm not "doing a Rusty" and
chickening out. :)
I never hear it Richard? from Blue Mountain
Instruments? ever had any trouble with this turbo unit.
I forget which one it was, but it was not the stock
Mazda.
You mean Greg Richter. No he didn't report any problems. It was a
custom designed Turbonetics T04. He sold it when he took the engine off
and put the jet in. I wish I'd bought it.
Ah well. We live and learn, and yet another Lamar
recommendation goes in the trash can. :)
Thanks for the input.
John
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