First time with the Evo on the dyno. Nothing ground breaking or unusually impressive here. Just a reference before and after dyno of my '03, to tune for the Walbro and mods so far and a little bump in power.



293 awhp, 303 lb/ft. SAE corrected, dyno is at 5300' + elev., about 63* F, 18% humidity.

Stock airbox and filter
XS Engineering downpipe
Test Pipe
HKS Hi Power cat back
Forge MBC
Evo IX DV
T bolt clamps
Walbro
ECUFlash tune by a local tuner
21psi. according to DynoJet boost reading (supposedly high), boost gauge in car reads about 19psi, so not much over stock, if at all.

Don't ask why the chart only reads to about 6700 RPM. I wasn't driving so I don;t know. Maybe it was just falling off after that? I would have liked to see how much though...

We had some runs with more power (>300hp+) but started seeing a little bit of knock and some strange boost and hp/tq fluctuation, so we tuned rather conservatively. After about 9 or 10 pulls the car was getting pretty hot and we started to lose some power. It didn't look like we were going to get much better power during the session so we stopped there.

Driving away from the dyno facility I definitely had a boost leak at 5k RPM, which has since subsided for the time being but this would explain some of the inconsistent numbers, and perhaps some lost power. I did a boost leak test just a few days before this and the pipes were holding 22+ psi pretty well, and only taper off after a few minutes down to about 17 psi where it would rest for 10 min+.

Feedback and comments welcome. I plan to upgrade to 272 cams next.

 

nice congratz wonder what that would been mon 93 octane that would be a intresting comparison

 

I would think that if the leak was there during the dyno-tuning session then you need to go back, as the possibility exits that you might be running a little lean after the boost leak was fixed. When there is a boost leak the engine runs richer and if the tuner compensated those rich spots the engine might be a little lean right now

 

Yeah it would probably make a little bit more power at sea level on 93 oct. But 91 is the highest we get up here with out thinner air.

If you think 5300' is high elev. I live at about 6,300 and regularly do canyon runs to about 8,000'.

 

Yeah that's a good possibility, thanks for the feedback. I'll see how soon I can get back there. I'm really busy these days and that session wasn't cheap, but I don't want to be running lean, that's for sure.

 

Ha!, dyno sessions don't hurt the car as much as the wallet