I'm seeing a step increase of 0.5 to 1.0 msec on my injector time at 7000 RPM with no reason for it in the fuel maps. It is odd that the instant the RPM crosses 7000 RPM it does this - it would be interpolating between 6500 and 7000 and then 7000 and 7500, but the fuelling is the same at 7500 as 6500 so there should be no step change. It is reflected in NBO2 and WBO2 readings, but not on the butt dyno. There are no timing or knock reading anomalies.

Anyone else got this?

 

http://john824.fotopic.net/p29823913.html

Lean spool disable RPM is at 7000...

I've already changed the 3500 to 2500 which has allowed an AFR change in response to changing the fuel map. Most Evos seem to be at 2500 RPM.

 

hey does ecuedit support the evo roms now? or is just a reference?

 

My JDM JM8857-08 ECU wasn't defined anywhere, so I found most of the important maps myself through searching through the hex by recognising patterns (MIVEC, high octane fuel, high octane ignition #2, overboost fuel cut). Lean spool ones were posted on openecu. I've made part definition files for the stuff I need for ECUflash and ECUedit.

 

I know that US cars don’t have the Lean spool functionality. It is in our map but apparently it does nothing. What does it do for you?

 

dudical26, there was apparently a problem with the standard 2005 JDM Evo IX dropping exhaust valves from running too lean and excessive EGTs. It seems that Ecutek tuners of these models are reducing the lean spool RPM from 3500 to 2500 RPM to fix this, so I did similar. Initially I found that I was getting lift off det and thought this was from it running lean, but in fact it was the intermediate load zones being too advanced and richening it up made no difference. The way I believe it works is that below the lean spool enable RPM it seems to substitute that "12.98" AFR for whatever is in the fuel map under given load and time conditions. It actually seemed to run the AFR in the 13s even at silly boost... obviously not good. Then above lean spool enable RPM it seems to translate the entry in the fuel map with the lookup table posted, leaning it by about 1 AFR. The units of time on the picture shown are wrong - they are way shorter than that I believe. There is some funny business going on at 7000 RPM which I can't explain from any of the other tables, so I am suspicious. I'll adjust the lean spool disable beyond the rev limiter when I get chance. I've already moved the rev limiter to see if that changes it and it doesn't - I wondered if say 606 RPM before the limiter it was enriching for some reason. If there is no clear solution I might end up making a zone at just over 7000 RPM which is leaner, but I need to leave 7000 RPM itself rich so that in the 6500-7000 RPM range it doesn't lean out because of the interpolation.

Found the step at 7000 RPM on the Ecutek map I got the car with as well... this is a remapped UK FQ340 ECU, don't know the code number, but the car was not an early Evo IX so probably a different/later revision to the earlier JDM IX ECU I'm remapping, but it is still there. See the last IPW point at 7000 RPM - it would continue on higher from there.
http://john824.fotopic.net/p31039777.html

Any ideas/thoughts welcomed, that is why I posted.

 

Changing lean spool disable to 7500 RPM means it now happens at 7500, 106 before the rev limiter. That is fine by me.

 

JM8859-15 USDM EVO IX seems to have 2500 and 7000 RPM as 80 and 224 byte values at &H1281 and 1285 for lean spool enable and disable.

Might be worth the USDM guys just being sure it isn't being used... it appears to be nothing to do with antilag or secondary air system on my JDM ECU... look out for step increase at 7000 RPM in IPW.