I just started logging AFR with evoscan and my uego. I am wondering what you guys think about my AFR's, To me they seem lean until 4k rpm's. Mods are:272's, 3"tbe w/hi flow cat, smc alky(100%denatured alcohol), boost at 26psi, 93oct, custom tune. Thanks in advance for any feedback.

Edit: Added another log, this is a 2nd gear pull. I turned the alky spray start to what looked like 14si to no avail. I am going to have to do something about the fuel map in the car at the very least. I have not adjusted any maps inthe car and really have no idea wha I'm doing, probably have a retune done to fix the lean spot. I am kind of nervous to drive the car hard at this point even though the knock is'nt terrible.

 

what version of evoscan are you using?

 

.97 at the moment, so far when i try to use .98 I am having some strange issues I am trying to figure out.
https://www.evolutionm.net/forums/sh...d.php?t=256629

 

TTT, any body want to throw in their .02

 

Hi

This looks like the lean spool feature, try increasing the values of the Aceleration Enrichment map in the 2K to 4K region.

Where you see knock, take 1 degree of ignition out, do this in the load cell above and below the one your running in. The cells below the one you're running in (load) should have a bit more advance and those above a bit less.

MB

 

Should I disable this lean spool? I am worried that the afr is really lean right when peak tourque starts to hit.

 

I would add just a splash of fuel at 3000 and 3500...I wouldn't pull any timing there, it isn't knock enough to start doing that.

 

Hi

Open the map up and look at the figures where boost starts to hit, maybe raise the figure up a bit, a little trial and error should see things a bit better. It might be easier than adjusting every fuel cell. If your not knocking then you should be ok.

MB

 

You thinking to raise afr in those regions like a point? My main worry is that I am bordering on dangerous lean right now running alot of boost(26psi). Another option may be to start my alky spray a little sooner. Which option shoulde be more effective?

 

bump

 

Are you spraying late?


Your making massive power, but that lean spool needs to be fixed right away! Once in the 11's it bounces up and down abit, but you can fix that later. I would pull 2 - 4 degrees from 3750 to 4500 rpm too but it will take some work to regain the power but it will be consistant, believe me I had 9's there too.

First and foremost, either spray the methanol earlier or add about 2points fuel down to like 90% load, You put an intake on there or something

 

I disagree, it's too lean to begin with, pulling timing is just going to lower the power.

add fuel there

 

That was what I would say too, nevertheless, he needs to fix that 13.5 A:F before the engine goes before anything

 

Well, it dosent seem like knock is an issue, If you are able to get away with that kind of timing at peak torque, damn i would love to see how hard your car explodes once it hits.


But, did you guys consider that his wideband could be off? If its that lean around the area, with only 1 count of knock? perhaps its not that lean?

but, i would go with what C6C6CH3vo said, why not pull 2 degrees right there, and add a tad bit of fuel? see what happens, if your runs stay consistent, heck why not go back in and add a degree back, if your AFR stays solid,

Are all your pulls little to no knock consistently?

 

The car does knock more than this from pull to pull, never more than 5-6 counts though. It does pull HARD. I am looking at this lean spool map in my rom and the values right in my problem area are really lean. I don't know how much of an affect that map has with my issue. I am going to do some more pulls this weekend and try to start my spray a little earlier to see what affect that has. I am not a tuner though and to dive into the ecu is just something I have'nt done yet.Keep the suggestions coming and thanks.