Getting started on AVCS

There's another table called AVCS which according to web affects VE (Volumetric efficiency). I realised that Rene has changed my table value last time, so I've been running on non-stock values! Funny thing is the low end values are all 0!

Here's my first try at this table:

Current map:


My changes:




Here's what it should like when stock!!


I'll feedback on these changes next. :-)

Open Loop Fuel tuning

I've analysed my log for the dyno pulls and decided that I'm not going to tune my fuel for my lower loads as yet.

I made some changes to my AFR for my high load areas (running richer) since those areas are leaner than 12.5 (see red areas):



Green areas look ok, except for 4564 rpm but I'll monitor that area for now for future logs.

Ill stick to this for now and start with AVCS next coz I will need to retune my fuel again when I tune AVCS.

Re-think my fueling strategy

When I did the dyno runs, i did some runs with my innovate LM-1 and found that at high end cells the logged AFR is 12 - 12.3 is quite close to my target AFR of 12.5:1. So with a value of 11.76 in Open loop cells, that's about right.

My low end however tends to suffer when going lean. I'm going to focus on getting my high end AFR on the spot first and slowly move into the lower end cells.

Dyno figures using Data Log Lab

Now that I am starting to tune for power, I need a way to quantify how each map is performing relative to the other. ravenhil recommended Data Log Lab and after some tweaking with tips from romraider (see the post here), I've some dyno charts using my current map 20081231_300gHackFuelOpenLoopv2.

I'm using the gear ratios from this website

Run1: 361hp@6739rpm, 408Nm@5433rpm


Run2: 344hp@6137rpm, 385Nm@5976rpm


Run3:369hp@6574rpm, 387Nm@6383rpm



Well, although the figures vary with each run, sure it's about there. Take a look at Edge's dyno figures for PE1825 here. They achieved 347bhp@6628rpm but with 454Nm@5082rpm.

The hp figures are quite close but the torque figures are way above mine and it comes in earlier as well! That's something I have to work towards :-)

Getting started with my fueling

I'm going to focus my fueling tuning on 2 areas:

1. Whilst cruising
2. At 100% throttle

I've noticed on my Innovate my LM-1 that whilst cruising, my AFR is about 13.8 which is kind of rich. I've started to make some changes to push it to 14.4 and it seems to run fine. I'm going to try for 14.7.

As for 100% throttle, I'm going to push for 11.7 first and see how the car behaves (if there is knock).

Here's my current map:


And the changes:


The above map is 20081231_300gHackFuelOpenLoopv2.hex.

I'm going to target 14.7 for my cruising AFR.

Done with my tuning my timing

Ok, after spending about the past 3months tuning my timing. I feel I'm done with it now.

The map I tested at Pasir Gudang track is good with:
- 50-50 methanol injection
- Channel 3 of my SBC-ID which gives a max of 1.75bar of boost

The map is 20081229_300gHackFueTipIn.hex

My next focus will be to tune my fueling and AFR targets.

Time attack at Pasir Gudang

Happy New Year!! I can't believe that 2008 is finally over and 2009 is here. Time really flies.

Before the New Year arrived I went to PG track to test out my new map. My best time was only 2min 3s -> 4s off from my best time :-( I feel I have more than enough power but my car handling in the corners does not allow as fast turn in as I would want. Cornering speed is ok I guess.

One thing about my map is that I think I am running really rich coz my exhaust burnt part of my bumper.


The map I used for the track is: 20081229_300gHackFueTipIn.hex

I guess my next tuning focus is for open loop fueling. Since I am running with methanol, my AFR should be 12.5:1