'95 M3 5-speed
AA Stage 1 turbo kit
custom air box/heat shield
6psi base boost setting, but boost started dropping off to 4psi above
5000rpm (due to wastegate setting/design)
run(s) made in 3rd gear
2 1/2" downpipe, high-flow cat, stock muffler
custom tuned chip (by me)
I can't wait to see the results after I get the boost stable at 7psi all the
way to redline. Maybe 300rwhp??
Wow.. here are a few thoughts..
- Your torque curve..its's flat!
- I'm a little skeptical that you're only making 4PSI
at the HP peak. Here's why. If you take a stock M3
and dyno it it will make around 200RWHP. Given that
the MAP is 14PSI absolute, that's 14.28 HP/PSI. Now,
take a nicely tuned NA M3 with a CAIS. It will have
about 14.5 PSI MAP. It will make, say 225RWHP or 15.5
Your car is making 280RWHP at 18.5PSI. That's
15.1HP/PSI. Which is better than stock. And almost as
effieient as a tuned NA car. I'm not saying that this
isn't possible, it's just amazing.
Normally you'd expect the turbo motor's pressure-power
efficiency to be much lower than the stock NA one.
For example, AA's example Stage 1 on the site makes
295_at_21.5PSI absolute or 13.7HP/PSI. I'm not sure what
my car did since the boost also dropped off because
the BC wasn't set up correctly. But I expect it to be
worse than AA's.
3) If you are really only running 4PSI and you can
maintain, say, 15.0 HP/PSI then you'd make around
320RWHP. In reality, I'll bet that the efficiency
drops off a lot above 4PSI as the timing retards to
deal with detonation. But 300RWHP should be within
reach. Ironically, 320RWHP is 380 at the crank, which
is that Mitsu says that our turbo can support.
4) It will be interesting to see the EGO of your
engine at some point.
5) That torque curve sure is flat. :-).
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