Pscan tuning features: How do the "Trim 2" buttons work?
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Rule 1 - Is that you need to think very carefully before posting anything technical or asking anything technical relating to the security system of the car - See 'Security Issues' sticky for more info.
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Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
Not many rules really, this board being aimed at technical issues, it shouldn't fall foul (hopefully) of some of the more personal issues that can affect forums.
Rule 1 - Is that you need to think very carefully before posting anything technical or asking anything technical relating to the security system of the car - See 'Security Issues' sticky for more info.
Rule 2 - We (MGF Register) do not support copyright infringement and therefore references to CD ROM, PDF versions or paper copies of the workshop manual (for instance) should not be posted on the forum. We don't want to get into trouble and we'd rather sell you a genuine hard copy through our Regalia shop anyway!
Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
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jonaf
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Pscan tuning features: How do the "Trim 2" buttons work?
Do the "Trim 2" buttons work in closed loop mode? Can they be used to tune exhaust CO content to pass MOT?
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Rob Bell
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Re: Pscan tuning features: How do the "Trim 2" buttons work?
Not quite sure which buttons you mean Jon - can you screen shot and upload what you mean here?
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Rob Bell
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Re: Pscan tuning features: How do the "Trim 2" buttons work?
Also, you mention you need to trim the CO for your annual inspection: do you have the exhaust emission numbers - you shouldn't really need to trim the ECU to get these engines to pass.
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jonaf
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Re: Pscan tuning features: How do the "Trim 2" buttons work?
Rob, this is the "Tuning features" page I am referring to.
I do not know how my CO is at present because my Gunson analyzer is not able to read the value exactly. But on the last MOT the tester had to make a fast run down the road to heat the cathalyst in order to make it pass.
I do not know how my CO is at present because my Gunson analyzer is not able to read the value exactly. But on the last MOT the tester had to make a fast run down the road to heat the cathalyst in order to make it pass.
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Rob Bell
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Re: Pscan tuning features: How do the "Trim 2" buttons work?
Heating the catalyst is sometimes all that is needed
Log the Lambda live feed - this can give you a good idea as to the state of the catalytic converter...
You probably saw this post on "tuning" MEMS1.9? https://mgfregister.org/forum/viewtopic ... 8&p=189640
This menu on pscan has been reverse engineered from Testbook. Honestly, I don't know what it does? I thought that the trim levels were adaptable according to the ECU learning fueling from the Lambda feed and adjusting accordingly? I didn't know it had some other adjustment... interesting!!!
Log the Lambda live feed - this can give you a good idea as to the state of the catalytic converter...
You probably saw this post on "tuning" MEMS1.9? https://mgfregister.org/forum/viewtopic ... 8&p=189640
This menu on pscan has been reverse engineered from Testbook. Honestly, I don't know what it does? I thought that the trim levels were adaptable according to the ECU learning fueling from the Lambda feed and adjusting accordingly? I didn't know it had some other adjustment... interesting!!!
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jonaf
- Posts: 150
- Joined: Sat Oct 27, 2007 4:12 pm
- MGF Register Region: Europe
- Model of Car: '96 1.8i
- Location: Norway
Re: Pscan tuning features: How do the "Trim 2" buttons work?
Rob,
After some playing with the Trim 2-buttons with an O2-analyzer connected I think they indeed work only in open loop. The CO values are not affected in closed loop. Leaning out the mixture by three steps gives a noticable poorer acceleration. Two steps more ignition advance and one step more richness felt like slightly better throttle response so I saved this setting.
Would sure be fun to play with the pscan with the car on a dyno some time!
After some playing with the Trim 2-buttons with an O2-analyzer connected I think they indeed work only in open loop. The CO values are not affected in closed loop. Leaning out the mixture by three steps gives a noticable poorer acceleration. Two steps more ignition advance and one step more richness felt like slightly better throttle response so I saved this setting.
Would sure be fun to play with the pscan with the car on a dyno some time!
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Rob Bell
- Committee Member
- Posts: 14425
- Joined: Tue Oct 02, 2007 2:36 pm
- MGF Register Region: South East
- Model of Car: MGF 1.8i + MGF Shed!
Re: Pscan tuning features: How do the "Trim 2" buttons work?
That makes sense Jon
When I went to the rolling road, I dragged Philip along - and he was playing with the fuel and ignition timing. I don't remember it being called "Trim 2" - but that was on an earlier release (or pre-release) of this particular page.
It certainly is fun playing with the fuel and ignition timing on the rolling road. I had the benefit of a wide-band lambda in the exhaust to ensure that we did not go too lean. Unfortunately there is no pink-sensor on the K-series, but we advanced the ignition to gain about 3 bhp, but then knocked it back a little to be safe.
So go for it - get on a rolling road and tweak away!
When I went to the rolling road, I dragged Philip along - and he was playing with the fuel and ignition timing. I don't remember it being called "Trim 2" - but that was on an earlier release (or pre-release) of this particular page.
It certainly is fun playing with the fuel and ignition timing on the rolling road. I had the benefit of a wide-band lambda in the exhaust to ensure that we did not go too lean. Unfortunately there is no pink-sensor on the K-series, but we advanced the ignition to gain about 3 bhp, but then knocked it back a little to be safe.
So go for it - get on a rolling road and tweak away!