Dyno Tales 3/26: Andy's EVO IX
 

Some locals may know Andy from when he worked at Gruppe-S. We now know him as the guy who baselined, with the stock ECU, at 263whp! ;) That's 20-30whp more than we expected given the mods (turbo-back, testpipe, HKS intake and Samco IC hose). With the flash, he immediately picked up another 40whp which doesn't suck. The fuel table had to be massaged a bit to account for the the Intake but the end results were just peachy. With Torque numbers than EVO 8scould only dream of ;)

Here are the final numbers with two back-to-back runs. On 91oct.

WHP and Torque
http://img.photobucket.com/albums/v4...yo/ANDYVO1.jpg

Boost and AFR
http://img.photobucket.com/albums/v4...yo/ANDYVO2.jpg

Boost & AFR ?
 

Shiv,

Love the graphs. Do you know why all of the IXs (mine included) seem to have this double boost --hits at ~3200 rpm, then drops, then hits again before the eventual taper? Is there a fix (wastegate, different BC, etc.)?

Thanks in advance for the advice / help.

Chris J.

Nice!!!

I personally would say that this is a natural consequence of a small internal wastegate trying to regulate the speed of a fast spooling high boosting turbo.

The wastegate opens, but can't bypass enough gas fast enough so there is an overshoot. Then since boost hits a bit high, the wastegate stays open a bit too long trying to correct which causes boost to overshoot a bit in the negative direction, and then it finally settles in on the target boost.

Wow, very nice. Can't wait for the xflasher to flash the IX and get 300whp with basic mods from the comfort of my home.

Isn't that boost high for 91 oct? wtf? 23psi? som1 help

Nope. The 9s have a much higher knock threshold than the 8s due to the effects of MIVEC (being able to adance the hell out of cam timing in the midrange.) You'll notice tha the boost rolls off as the cam timing goes back to 0 by 6000rpm.

-shiv

Shiv I PM'd you

Awesome numbers for 91... as soon as my MR is broken in I hope to have a dyno that looks similar :D

So all IX's can safely hit 23psi on 91 oct. WOW! That is news to me

With the right ignition timing, fueling and MIVEC tuning, yes. Pretty amazing car.

When you get a chance plz read my PM. I'm coming soon and have some issues I need cleared up

so realistcally on 91 octane what's the highest boost level you can hit before actually doing some serious damage to the car? and now if it was 100 octane what's the level for that?

Boost itself wont damage an engine. Detonation is what damages an engine. As long as the car is tuned to not knock, it'll run safely. Tuning a car not to knock is about finding a good combination of boost, ignition advance, fuel and (in the case of the IX) correct MIVEC timing. No one particular variable is important by itself. It's the combination of all of them that makes the engine run well or poorly. On 91oct, we've found ~23psi in the midrange, tapering down to 19-20psi to be just peachy. On 93oct, we do about the same but we manage to get another 1-2 degrees of timing in there well before the onset of knock. On 100oct, we could proabably run that particular turbo as hard as she will run without detonation issues. This would be in the 27-28psi range (peak). It would most certainly taper down substantially as it appraoches redline. Trying to get turbos to hold more boost than they are comfortable supporting efficiently is a sure fire way to run into problems later on.

Shiv

its interesting to see how the torque dips between 3k and 4k... even on my dyno chart. - https://www.evolutionm.net/forums/sh...no+day+results