Ok, the reason why I need to re-scale my MAF is because for 16-bit ecu, there is a 300g/s limit. For cars like mine which has a bigger MAF housing, it's easy to hit this limit.
I mentioned a post on Romraider in my yesterday's post but the guys are not really working on it right now. It points to a link on NASIOC here which has a better workaround. I'll be working on this for now.
Tuesday, December 23, 2008
Monday, December 22, 2008
Rescale my MAFv table
Base on my last log, I think my next step is to re-scale my MAFv table which has reached its limit. This is due to the 16bit ecu. It'll be interesting how to go about this as not many people have tried it.
I'll guess I'll have to do some reading up and research on this. For now, I will be concentrating on this thread on romraider.
I'll guess I'll have to do some reading up and research on this. For now, I will be concentrating on this thread on romraider.
Sunday, December 21, 2008
Getting started on Methanol
Below is a log of 4th gear pull at 1.7 bar (Channel3 of my Blitz SBC-id Boost controller)using my base map for Water injection.
Some points to note:
1. The green areas show areas that I can add more timing (with methanol).
2. Though there is still knock, I think this is due to the higher MAFv which is reaching its max.
Some changes I'm trying is to increase timing in those green areas:
Some points to note:
1. The green areas show areas that I can add more timing (with methanol).
2. Though there is still knock, I think this is due to the higher MAFv which is reaching its max.
Some changes I'm trying is to increase timing in those green areas:
Base Map for Water Injection
Since my last post, I've been doing several rounds of tuning to get a good base map for water injection and I think I've got it. This map is named "20081208_timing_tipin_fuel.hex".
With water injection, I've found that I can go as high as 1.5 bar of boost with no knock. My IDC is about 80% which I feel is quite safe. At 1.7 bar of boost, I do not have much knock. My max IDC will hit 95% occasionally.(see below)
No methanol needed. Only slight knock during normal driving which occurs vey rarely.
The object of this timing (part 2) is to go as far as possible with just water injection.
The only changes I did to get to this base map is to change my open loop fuel table (run leaner to 11.2 in high load) and my timing (increase).
With water injection, I've found that I can go as high as 1.5 bar of boost with no knock. My IDC is about 80% which I feel is quite safe. At 1.7 bar of boost, I do not have much knock. My max IDC will hit 95% occasionally.(see below)
No methanol needed. Only slight knock during normal driving which occurs vey rarely.
The object of this timing (part 2) is to go as far as possible with just water injection.
The only changes I did to get to this base map is to change my open loop fuel table (run leaner to 11.2 in high load) and my timing (increase).
Monday, December 1, 2008
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.
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.
Monday, November 17, 2008
Done with tuning my low end timing
After more than 2 months tuning my low end timing. I'm quite satisfied with how the car performs during acceleration from stand still and whilst cruising. Here's my latest timing map from rom 20081019_advance-no-knock.hex. I've decided not to go any further coz everytime I increase it, i keep getting knock.
I'm going to start tuning my timing map when boosting now. Hope I don't blow anything. :-)
I'm going to start tuning my timing map when boosting now. Hope I don't blow anything. :-)
Sunday, November 9, 2008
Increasing my boost limit
I keep getting P0244 CEL whenever I run higher than 1.3 bar of boost. To solve this, I need to increase my boost limit. The boost limit is set by the following 2 tables:
Boost Limit (CEL) and Boost Limit (Fuel Cut): Below are my stock settings (see the last window, the top 2 are from other reference ROMS):
To know which value to change, I need to know what is my atmospheric pressure. I can find this out by logging atmospheric pressure which is 4.65 (see below):
So, I change the column under 14.7:
The stock setting is : 20.69 PSI (1.426523 bar)
I've up it to : 29.39 (2.026366 bar)
That's it!
Boost Limit (CEL) and Boost Limit (Fuel Cut): Below are my stock settings (see the last window, the top 2 are from other reference ROMS):
To know which value to change, I need to know what is my atmospheric pressure. I can find this out by logging atmospheric pressure which is 4.65 (see below):
So, I change the column under 14.7:
The stock setting is : 20.69 PSI (1.426523 bar)
I've up it to : 29.39 (2.026366 bar)
That's it!
Subscribe to:
Posts (Atom)
