Getting started with tuning timing for higher end

As mentioned in my earlier post, I will be usiung the starting base ROM from 20081019_advance-no-knock.hex. I will name this base rom as 20081120_BASE.hex.

This base map works well with no knock on Channel 1 on my SBC (boost 1.3 bar)
On Channel 2 however, there is some knock on the higher RPMs (boost 1.5 bar)
There is no knock during normal driving but after flashing there may be some slight knock. It will resolve itself aftera few days of driving.

No water/alcohol injection is needed.

The first step I did was to set my timing changes as follows:
1st area 0.2 x 2

2nd area 0.2 x 2

3rd area 0.2 x 3

4th area 1 x 3

Final changes:


Target AFR changes:


Tip-in changeas:
5.2 onwards 50x 4
7.5 onwards 50 x 4
9.8 ownards 50x 3
12.3 onwards 50 x 3
14.6 ownards 50 x 3
17 onwards 50 x 4
19.5 owwards 50 x 1


These changes created knock (probably due to the increase in timing):


I considered increasing my target AFR and also my tipin but then.. I thought, why use water injection (since it is already installed and running). When I did that, there's no knock. In fact I even reverted back my tip-in and target AFR. i.e. only include the timing changes in this post and did another 3rd gear pull - NO KNOCK!!

I drove back on the highway and did some enthusiastic driving at above 110km/h with boosting and found I have knock. I noticed that it happened at 20% throttle, maybe I can increase my tip-in in those areas:


I'll try that out and post the results on my next blog (probably increase my timing too + plus methanol heehee). My ROM for this round of changes is 20081128_timing_boostlimit_forwaterinjection.hex

Perhaps, I will try how much timing I can add with water injection before starting on methanol. That way I have a map that I know is safe with water but without methanol.