MJ and the boys...

i have been trying to disable the boost enhancement dealio 1282/1284 i believe with standard values of 2500 and 4513.......

I have set both values to 2500, originally i intended to set them both to like 9,000...

one car in particular now seems to have a "dead spot" at around 2500 rpm.... I need to log to see what is going on, i noticed it when i drove the car home for the client to pick it up..... and he has noticed the same thing...

maybe its not related... but i reflashed this car before, and didnt touch those maps... ill log this week when it comes back, then set it back to how it was, see if it changes...

but just a note... any thoughts?

cb

 

bump...

 

I havent noticed any side effects from disabling the lean spool Chad, but I also have it set at 1500/1500. Chances are if there is a deadspot issue that is "common" I am always above the rpm. I guess if it is related try setting it at an rpm that will never be reached (as 9K for example) or one that they will always operate above (1250) and see if it disappears or not.

 

The middle value of the 3 is the AFR value used before the lower RPM is reached I think, and nothing to do with 4513 RPM. So I would change the RPM at 1280 and 1284 to a low RPM and leave 1282 alone - it is NOT an RPM value!

 

i changed it back to the oem settings, and the dead spot went away...

cb

 

Sounds like the ECUFlash definitely needs updating! Good thing you mentioned this. I was going to try changing this value because I am seeing an increase in AFR as my engine passes 4500 rpm and was thinking that the AFR change is linked to the value at 0x1282.

 

More likely a change in VE of the engine at this point- this is an area where boost drops as well so you often need higher duty here.

 

Are you saying the 2500 and 4000 labeled as RPM are not RPM?

please explain one more time... I think I may be experiencing very un-diagnoseable knock at cruise because of this, I've set it at 9000, 9000. So, how exactly do I turn it off? Put it back to OE settings? I have to lower cruise timing @ 2500-4000 to around 15ish from the stock 32ish. School me please. Also please understand that I have no idea what your talking about when you say to "change 1280" etc. I just understand the tuning and programs as used.

 

Put 1280 and 1284 (or 1680 and 1684 depending on model) to 1500 RPM. Leave 1282 alone. The 2500 and 7000 are as standard, the 4513 is not an RPM value! In the code it is dealt with as an AFR value.

If you set 1280 and 1284 very high you'll always be using the AFR at 1282 I believe.

However, I keep it simple and just set the 1280 to 2000 RPM and the 1284 to 7500.

 

I'm really sorry to be a pain... but I dont understand "Put 1280 and 1284 (or 1680 and 1684 depending on model) to 1500 RPM" considering the fact that I dont understand what 1280 or 1284 are. Could you speak in terms of ECU Flash? Are you saying to change the values in the "Boost enhancement start/stop RPM" parameters? My guess is you're not. I'm sorry that I'm ignorant.

My guess:
by 1282 you mean some adress that is pointing to the fuel map?
by 1280 you mean some adress that is pointing to the boost enhancement start value?
by 1284 you mean some adress that is pointing to the boost enhancement stop value?

I have no idea how to do this. Currently I have (in ecuflash) both "boost enhancement" variables set to 9000. Is this what you're saying to do?
lolIlooklikeanidiot.

 

I don't call them boost enhancement values because I'm not convinced that is what they are and I had to make my definition because the JDM/UK Evos didn't come with ECUflash.

Your guess is correct I think.

Lots of people are playing with these values without knowing what they're changing. I can tell you that by setting the two RPM values to 9000 you are running it all wrong!

I think you might be better leaving them standard. Change the 7000 value to 7500 RPM if you want to stop it going too rich at 7000.

Use your wideband to adjust your fuel map relatively and ignore trying to get the AFR map values to align with your wideband.

 

If you really want to turn off this feature to richen your fuelling to nearer to what is in the map then put the 2500 value to 1500 RPM and the 7000 value to 1500 RPM. But I don't do this, haven't tested it and don't recommend it. Fiddle with what you understand and NEED to adjust.

 

I thought it was the lean spool enable and disable that we were messing with to get rid of the afr leaning out... thats at address 1281 and 1285 for the IX. I dont mess with the anti lag stuff. My luck is I would turn it on and fry something since we dont have the hardware to make use of it.

 

I though 1281 and 1285 where for 05s? quick question, why are ppl dissabling this? what is it preventing/causing exactly?

 

The lean spool and boost enhancement stuff seem to be the same.

My only real interest in this is owning a JDM based car whose native ECU (before they are Ecutek flashed by Mitsubishi UK and made into FQ models) has a lean spool enable at 3500, and below this point uses the 4513 "RPM" value (which is really an 0x90 fuel map value = 13.1:1 AFR) which makes it too lean when I have 25 PSI at 2500 RPM. Only JDM IX owners need to worry about this.

The next thing I found was that the lean spool disable at 7000 RPM gives a rich IPW step of about 1ms, so I moved it to 7500 - 106 RPM before the rev limiter. This seems to apply to all cars. THIS IS THE ONLY THING THAT US EVO OWNERS SHOULD CONSIDER CHANGING unless they really know what they're doing.

If the rest is too difficult to understand don't change it!

If you want to remove offsets caused by these features in the 2500-7000 RPM range then you can set your enable and disable RPMs to a LOW figures like 1500 RPM. Your 2500-7000 RPM range will richen nearer to the AFR map values.

I don't know how else to explain all this.