Did Some 'SharkTuning' today
03-18-2006, 10:55 PM
#1
Three Wheelin'
Thread Starter
Did Some 'SharkTuning' today
I finally had a good block of time to play around with John Speake's SharkTuner again today. I will post some pics between tonight and tomorrow about the physical install, since there were a number of questions last time. Again, it is very straight forward.
I set out to address two problems with the SharkTuner. One was the vehicle going into limp home mode at idle. I think that Sebastian and I got that one resolved when we autotuned the idle last time around. I want to do some more verfication to ensure that it is not still intermittant.
The second was to address the lean condition under tip in. I have sent john some data loging files for his opinion, but from what I can see the problem is resolved. The idle issue was solved by leaning out the idle fields in the fuel map. The tip in issue was solved by adding fuel to the fields in the fuel map that constitute a high MAF load at lowish to mid rpms.
The one thing that I found was that when optimized for a second gear WOT run, there were some fields at high MAF load, low RPM that were too rich when 'hit' by going WOT in 4th or 5th gear. In other words, some of the fields that you hit in a WOT condition may be optimized for one gear, but then are way to rich for high gear. I had to play to find what I considered a good balance.
I am hitting the full MAF voltage output (5V IIRC) under WOT condition. I guess I would need a supermaf to really optimize 100%.
I have to say that the SharkTuner is a bit addictive. I think that if you are the kind of guy or gal who will be tweeking your Shark alot, you would want to have this tool (if your plan is to use the stock ignition and fuel injection brains). You can autotune or manually adjust each and every field in both the idle+ cruise fuel map and the WOT fuel map. The tool has excellend data loging functions to verify stuff like engine temp, rpm, MAF load, fuel injector duty cycle, AFR etc. John's manual is available so you can go through it at your leisure.
By the way, I have no commercial interest in the SharkTuner.
I just tried uploading some pics. File size too large. I will play with it in the moring and try to post pics again tomorrow.
I set out to address two problems with the SharkTuner. One was the vehicle going into limp home mode at idle. I think that Sebastian and I got that one resolved when we autotuned the idle last time around. I want to do some more verfication to ensure that it is not still intermittant.
The second was to address the lean condition under tip in. I have sent john some data loging files for his opinion, but from what I can see the problem is resolved. The idle issue was solved by leaning out the idle fields in the fuel map. The tip in issue was solved by adding fuel to the fields in the fuel map that constitute a high MAF load at lowish to mid rpms.
The one thing that I found was that when optimized for a second gear WOT run, there were some fields at high MAF load, low RPM that were too rich when 'hit' by going WOT in 4th or 5th gear. In other words, some of the fields that you hit in a WOT condition may be optimized for one gear, but then are way to rich for high gear. I had to play to find what I considered a good balance.
I am hitting the full MAF voltage output (5V IIRC) under WOT condition. I guess I would need a supermaf to really optimize 100%.
I have to say that the SharkTuner is a bit addictive. I think that if you are the kind of guy or gal who will be tweeking your Shark alot, you would want to have this tool (if your plan is to use the stock ignition and fuel injection brains). You can autotune or manually adjust each and every field in both the idle+ cruise fuel map and the WOT fuel map. The tool has excellend data loging functions to verify stuff like engine temp, rpm, MAF load, fuel injector duty cycle, AFR etc. John's manual is available so you can go through it at your leisure.
By the way, I have no commercial interest in the SharkTuner.
I just tried uploading some pics. File size too large. I will play with it in the moring and try to post pics again tomorrow.
03-19-2006, 08:00 AM
#2
Rennlist Member
Hi Cameron,
Your results look very good :-) Although you max out the MAF at higher loads, you have managed to keep the fuelling well under control.
Examination of the data logging for the tip in issue certainly shows that that the A/F ratio is good at the transient point at which you kicked the throttle. It leans to 14.3:1 at this point which is fine.
We have since added adjustable transient enrichment parameters to the ST which are being tested at present.
Yes, a SuperMAF would allow better control of fuelling at the higher load levels, and would be essential especially if you plan to raise the boost fiurther.
But what you have now looks good !
Regards
Your results look very good :-) Although you max out the MAF at higher loads, you have managed to keep the fuelling well under control.
Examination of the data logging for the tip in issue certainly shows that that the A/F ratio is good at the transient point at which you kicked the throttle. It leans to 14.3:1 at this point which is fine.
We have since added adjustable transient enrichment parameters to the ST which are being tested at present.
Yes, a SuperMAF would allow better control of fuelling at the higher load levels, and would be essential especially if you plan to raise the boost fiurther.
But what you have now looks good !
Regards
03-19-2006, 10:27 AM
#4
Three Wheelin'
Thread Starter
SharkTuner comes with cable to connect to PC and Sharktuner software and cable to connect to 928 Diagnostic Socket beside passenger seat. Ribbon cable connects to special connector that comes with the Sharktuner to plug in to the LH unit in place of the stock chip.
Last edited by Cameron; 03-22-2006 at 10:44 AM.
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03-19-2006, 10:59 AM
#10
Three Wheelin'
Thread Starter
Knowing that I was using the Innovate Motorsports LC-1, the SharkTuner was sent with this cable to easily connect to the O2 system output. Wires were marked for easy installation.
The pocket ac power source was connected to the cig lighter to provide AC power to my PC running SharkTuner software. Just in case you don't have a DC power cord for your PC.
The pocket ac power source was connected to the cig lighter to provide AC power to my PC running SharkTuner software. Just in case you don't have a DC power cord for your PC.
03-19-2006, 12:27 PM
#14
Three Wheelin'
Thread Starter
Peter,
Thanks for the kind words.
John,
Re the tip in issue, the previous LC-1 data logging that I did with the stock chip (no SharkTuner) showed that upon tip in, the mixture would go lean into the 15's and on occassion 16's. It would come back within about 1-2 seconds but it was noticable in the logs. One time when doing a rolling start at 5 mph in 1st, the AFR actually spiked up to 18 (yes, that lean) before coming back to the high 12's where it mostly remained. But it did that by working its way through the bad fuel map to fields that were more accurate. The lowish - mid RPM, high MAF load fields in the stock chip are way way lean for the blown application so it is lean until you work through those fields as the rpm increases.
Contrast that to what I could see now with the SharkTuner logging from yesterday. With the fuel mapping adjusted, when I hit it, the fuel injection brain is into the same fuel map fields, but now they are providing more fuel in the same low rpm, high MAF load situation. I tried in a few different gears, at a few different RPM points (1500, 1700, 2000, 2500) to induce the lean condition on tip in and it just didn't happen.
I wouldn't do this in normal driving, but I tested 1500 rpm in 5th and the afr actually went immediately too rich ( a tick under 10). Not pretty. That is where I started taking fuel out of the WOT map again to reduce the WOT enrichment.
Just FYI. When you begin your SharkTuning, you tune the idle+cruise map first with the WOT map at zero in all fields (basically no additional enrichment). Then you add WOT enrichment if you can't get enough fuel out of those fields in the idle+cruise map that you hit when you go WOT. What I noticed is that there are many fields in the idle+cruise map that you only hit when you go WOT or near WOT. Just by enriching these specific fields in the idle+cruise map, you almost completely address the tip in issue. I then added a bit of WOT enrichment in the final tuning.
Another suggestion. I was concerned about doing the WOT testing in a lean state, so before I started the WOT testing, I manually made rich the high load area in the idle+cruise fuel map. That was very easy with the SharkTuner as you can manually select a field or a group of fields and add or reduce fuel with the touch of a button on your computer screen.
Thanks for the kind words.
John,
Re the tip in issue, the previous LC-1 data logging that I did with the stock chip (no SharkTuner) showed that upon tip in, the mixture would go lean into the 15's and on occassion 16's. It would come back within about 1-2 seconds but it was noticable in the logs. One time when doing a rolling start at 5 mph in 1st, the AFR actually spiked up to 18 (yes, that lean) before coming back to the high 12's where it mostly remained. But it did that by working its way through the bad fuel map to fields that were more accurate. The lowish - mid RPM, high MAF load fields in the stock chip are way way lean for the blown application so it is lean until you work through those fields as the rpm increases.
Contrast that to what I could see now with the SharkTuner logging from yesterday. With the fuel mapping adjusted, when I hit it, the fuel injection brain is into the same fuel map fields, but now they are providing more fuel in the same low rpm, high MAF load situation. I tried in a few different gears, at a few different RPM points (1500, 1700, 2000, 2500) to induce the lean condition on tip in and it just didn't happen.
I wouldn't do this in normal driving, but I tested 1500 rpm in 5th and the afr actually went immediately too rich ( a tick under 10). Not pretty. That is where I started taking fuel out of the WOT map again to reduce the WOT enrichment.
Just FYI. When you begin your SharkTuning, you tune the idle+cruise map first with the WOT map at zero in all fields (basically no additional enrichment). Then you add WOT enrichment if you can't get enough fuel out of those fields in the idle+cruise map that you hit when you go WOT. What I noticed is that there are many fields in the idle+cruise map that you only hit when you go WOT or near WOT. Just by enriching these specific fields in the idle+cruise map, you almost completely address the tip in issue. I then added a bit of WOT enrichment in the final tuning.
Another suggestion. I was concerned about doing the WOT testing in a lean state, so before I started the WOT testing, I manually made rich the high load area in the idle+cruise fuel map. That was very easy with the SharkTuner as you can manually select a field or a group of fields and add or reduce fuel with the touch of a button on your computer screen.
