Wow thats crazy. Seems to me that would make tuning allot harder and less accurate? Maybe im wrong but common sense and the little bit of tuning i have done the knock sensor has been my best friend!

Chris

 

I am sure that they are using det cans when tuning.

 

Knock, in my opinion, is one of the single most important engine parameters that need to be logged when tuning. Knock is what destroys engines, not fuel settings, timing, etc. Usually screw-ups in those other areas are what causes the knock, which then destroys the motor. If you can't monitor knock, you are just guessing. The other way to do it is to monitor timing as the ECU will begin to pull timing as it sees knock. But in order to see enough timing getting pulled, in my opinion, that is too much knock already.

I'm not sure about the EVO ECU's, but the 2G DSM ECU's have a max timing of 16 degrees at an airflow over 2.1g/rev. And the ECU will pull timing 1 degree for every 3 counts of knock. If the EVO is the same, then if you saw timing getting pulled by 5 degrees (you would have to have the timing map of the ECU first to know what the timing should have been at that airflow), then that would be 15 counts of knock. That's pretty bad and at high power levels it will eventually destroy the engine.

EVOVII SWE I was thinking more about what you said and it sounds like you did change your ignition timing. If you indeed do have the .82 housing and are getting the same spool, but are seeing 1000+ EGTs, then that sounds like you may have retarded your timing by quite a bit. Retarding timing will cause a turbo to spool much earlier (that's how some antilag systems work and may be why you are seeing the same spool for the .82 housing) and cause your EGTs to climb very high.

Eric

 

The Motec in my car has no knock monitoring but of course they used a knock monitor when the car was tuned.

I talked to the tuner today and he suggested checking the timing with a timing strobo lamp to see if turning that cam angle sensor changed the timing. He said that timing were 22 degrees at 1300-1500 rpms where my car idles. I will check that tomorrow and next week I will check the air/fuel ratio with a wide band lambda.

l2r99gst The reason for my cam angle sensor problems were due to the fact that we by mistake turned it 180 degrees wrong when installing my new Tomei cams and it sits on the exhaust cam on the EVOs. I turned it back to its correct position a long time ago so I’m not that convinced that that could be the reason for the high EGTs as that started just after I changed to the .82 turbine housing. Some guys at the MLR forum seam to think it could be due to a slightly lean mixture caused by a possible increase in air flow due to the larger a/r?

I’m very puzzled about a lot of things here, first that the larger a/r didn’t seam to make any difference in spool up or the general characteristics of the engine, then we have the EGT issue and the most frustrating thing is that I have nobody close that can tune my car again and I can’t do it my self. If everything works out my car will be tuned again in about 3 weeks from now when a guy is flying in to tune some other EVOs but I really would like to try to sort any issues out before he comes since he will only be here for a few days and we won’t have any time for such things once he’s here. Problem is that I stumble in the dark as it feels now, I have no idea why my engine behaves like it does and I can’t make any changes to the tune and not even check stuff in the logs. I’ll try to verify timing and air/fuel ratios now and see what that gives and then try to decide what to do based on the outcome of that.

 

Checked ignition timing last night and it doesn't seam to have been affected by the turned cam angle sensor, I have around 20-22 degrees on idle (around 1400rpms) which is what it was set to according to the guy who tuned the car. Some time during this week I’ll borrow a wide band lambda to check the a/f ratios as well.

 

Looks like the MLR guys were right. I hocked up a wide band lambda tonight and took the car for a drive. I was told that it should never go above 0.84 and at WOT and full load I read 0.93. I’m no expert on this so I don’t know how much too lean this is but my tuner told me not to push the car at all until it’s properly tuned again. Seams like I got a larger housing after all even if I couldn’t really tell by just looking at it and didn’t really notice any difference in spool either.

Feels like there is suddenly some light in the tunnel that has felt really dark lately

 

Well nobody listens to chris! I told you...lol... Well glad to hear your finally getting it finished. Now fly your *** over here and race me! Man do i have a story for you!

Chris

 

and no one listens to me. chris can you believe this $hit my car is still not here their truck broke 200 miles away and now it wont be here until f#@$ TUE. I am so mad

 

Man that is ****ed up. I would be like you owe me 2 days worth of work becouse id didnt have my transportation to get to work. LOL.. Well just thank god that it is ok when you do get it and not in pieces if you know what i mean...lol... How are things going anyway?

Chris

 

Well, I don't know, my car might get a jet "lag" What story is that btw?

 

Well lets just say now that the engine is running the car is getting fixed. LOL.. DAMN IT i cant win!

Chris

 

so any news? did u tune it?

 

Nope, the tuning guy never had time to come and now we have lots of snow here so it turned into a spring project

 

Thomas!

Buy Autronic and go to Poland - they will tune it within one day on professional dyno.

 

That's true. In Poland is that guy who tunes all the rallye cars.
He also did tune that 900+ hp drag Supra with the Veilside kit on it right Jarek?