Going Lean #4

My last changes (Going Lean #3) actually made things worse. Frustrated, I started from scratch again.

This time

1. Increment (Coarse) Value in the range below by 3X



2. Increment (Fine) Value in the range below by 6x



3. Increment (Fine) Value in the range below by 2x


The ROM is: 20080816_lean.hex

4. After doing some logging, the following point had a knock:


5. So I changed the area (denoted by the log) by Decrement (Fine) Value by 1x

The ROM is: 20080816_lean2.hex

6. I did more logging using mickey's timing spreadsheet and the following areas had knock:


7. So I Decrement (Fine) Value by 1x in the following cells as pointed out by the spreadsheet:


8. I noted that at 800rpm, sometimes my rpm drops quite low. I tried this change:


The ROM is: 20080816_lean3.hex

That's all for now.

Going Lean #3

I was on vacation in Kota Bahrun for the past from 8th Aug to 12th Aug, so no tuning :-(

Here's what I did today (based on the knock on my previous logs):


But I still had some knock:


Here's my new timing map:

Going Lean #2

Ok, this morning on the way to my mum's place, I noticed that I have difficulty moving off from idle (~ 800RPM). Sometimes if I didn't give it enough throttle, the engine dies. Since from last, I didn't notice any knock with the higher RPMs, I decided to revert back to my stock timing map and only change the entire range in my 800 RPM range (the top half is my stock timing map, or rather the one that runs fine for 14.7 AFR Target):


Unfortunately, this caused knock:


That means, the changes I did yesterday were necessary. The thing now is to find which ranges I need to change.

Going Lean #1

I read this post on romraider where someone was trying to go lean in closed loop so as to have better fuel economy.

Basically the idea is to set "Closed Loop Fueling Target":


And increase my timing slightly:


After flashing, my logs showed no knock but my boost climbs much slower now. :-( Throttle response is not that great either. I'm going to flash my original timing and see if I get any knock.

Knock!!

Last Sunday when I was driving to my in-law's place with my wife and kid when my CEL came on. It's the usual P0139 (too lean). I was logging for knock at that time so I couldn't do a full analysis, but it was still useful though. Here's how it looks like when it happened:



You can see me coming off the throttle (0% in the last column) when I got the CEL.

One interesting thing I found out was that when I finally reached my in-law's place, I cleared the CEL code using my OBD2 reader (ScanGuage) and my drive on the way back home had knock all over. Strange .. I wun be reseting CEL using my OBD2 reader for now.

Up my boost from 1.1 bar to 1.3 bar

Well, since my logs are showing that things are going fine, I decided to up my boost to from 1.1bar to 1.3bar. I did this by changing the parameters in my Blitz SBC-ID boost controller.

Here are the changes: (Channel1)
For 1.1bar
Set: 40
Gain:15

For 1.3bar (with this setting, at 4th gear pull, it reached a max of 1.36 bar)
Set: 58
Gain: 20

Note: Boost readings above are from SBC-id itself.

From blitz sbc-id manual:
SET
Shows the boost ratio or boost pressure setting

GAIN:
Ratio of 0-100
Gain controls the boost response. The high the gain setting,
the faster the boost response will be. Stock turbo charged
vehicles with actuator type wastegates will usually use a gain
setting of 5-15 percent. External type wastegates usually
requires higher gain setting.
WARNING - High gain setting might cause boost spikes.
Note: Each channel can be set to each individual gain setting

At 1.1bar my IDC maxed at about 90%, it's the same at 1.3bar.. not much difference - which is strange right?

Here's the dyno graphs
on 27th July at 1.1bar
on 3rd Aug at 1.3bar



Lower HP at higher boost? Well, not exactly right coz I had my wife and son in the pull on 3rd August. After adjusting for weight, here's what I got (about 10hp gain) ..something's still not right!:


I'm too tired now. I'll post updates on another day.