Please take a look at the log and let me know some thoughts on what could cause the load, timing, IPW and WB to jump all around like it is. Misfire perhaps? When the car is doing this is when I'm climbing a 15% or so grade under load.
[IMG]<a href="http://s451.photobucket.com/albums/qq240/rdboatman/?action=view&current=screwyIPWloadWB.jpg" target="_blank"><img src="http://i451.photobucket.com/albums/qq240/rdboatman/screwyIPWloadWB.jpg" border="0" alt="EVO IX Datalog"></a>[/IMG]

 

Link to screen shot with ECUFlash fuel map and log:

http://s451.photobucket.com/albums/q...yIPWloadWB.jpg

 

Here is the screen shot with the whole fuel map. Lean spool is disabled and when logging without the surging the fuel map is between 11.6 at lower RPMs tappering to 11.3 at redline.

 

TPS shows 100 and the RPM is not increasing. Could be a slipping clutch. What gear were you in when this log was taken ?

 

5th gear

 

if the clutch was slipping the rpms would still indicate.

the fact that the rpms don't move for so long is interesting. I don't know why that is.

once you get that figured out, get that afr in the elevens please, there isn't enough gas around for you to be using it all up.

 

look at your 2byteload and jdmmap.. its all over the place...

no wonder your IPW's are screwed.

Maybe you got a vacuum/boost leak!

 

It only does the above under heavy load at low RPM. You can see in the below that it is in the 11's (where I want it). This is the exact same log and same fuel map as in the second post. If you look at the excel row numbers you can see this is just before the hic-ups started. Remember that the RPMs are not increasing rapidly due to the 8000 foot elevation and 15% or so grade I was climbing at the time. Any other ideas?

 

Tephra,

The screwy log all over the place is exactly why I'm posting. Within the last two weeks I've done a boost leak check and all is well (checked to 35 psi). Fixed a small leak at one of the injector seals and it is holding without any leaks now. Any other ideas now that I've posted an earlier time snapshot of the same log with AFR's in the 11's (ok high 11's) and logging just fine?

 

compression test?

 

deathtracks,

thats pretty good load you have. What happens when you start wot latter say around 3k rpm?

You have to be lugging the motor some to keep the rpms the same for that long at wot.
You say it only goes that rich under high load/ low rpm, is that all the time?
If the map is tuned there, I wonder if there is another protective instinct in the ecu.

how come your not under three feet of snow at 8000 ft.
where in utah?

 

boost leak

 

Surge and BOV opening with pressure differential at that low RPM. Seen it in many evos at altitude and cooler temps. My Evo does it like a son of a ***** when I go to Tahoe and get above 3000ft (I'm usually at sea level)

I imagine at higher rpm it doesn't do that right?

 

I agree, that does look like some of my older logs that had compressor surge. A higher running rpm more than likely won't have this issue when going up an incline. The JDM MAP log shows quite a bit of pressure variance that would indicate compressor surge, but that 100% TPS is a bit strange to see along side of it. Honestly you should be in 4th or 3rd at least going up this hill, lugging the engine like that up the side of a mountain is just going to break something.

 

I was working on getting that area of the map tuned. So this is not how I normally drive it (lugging it at low RPM). I was intentionally trying to get this portion of the map tuned so when my wife drives it (yes that occassionally happens) at low RPM there are not any issues. Most of the time she shys away from higher RPMs.

I think GST motorsports may have hit the nail on the head. It is a stock IX turbo so I didn't think it would surge but now that I think on it a bit more it won't do it above 3000 RPM at all. High load, low RPM with a long time to build boost (20 PSI at 2500 RPM) at high altitude could very well put it into surge.

Does anyone have a compressor map of the stock IX turbo to validate?