Very high long term offset
Discussion
The two banks don't fuel evenly, I dont think its physically possible with the fact that the plenum feeds air from one side, but you have another issue- number one would be a high AFM output- Ive noticed for example the AFM output can go up if the body gets really hot after a long run on the motor way- If all the sensor values where spot on, you could quite reasonably have one trim at say -10 % on one side and the other at +25 % and you would not worry about it, so you may have a single factor affecting both banks.
davelittlewood said:
Have a look the screen shots gents.
The long term offset on the even bank is at -98%!!
Is this normal??
Just a thought ... if this screenshot was taken with the engine running then the Main Voltage is on the low side, this can cause an additional adjustment value to be added to the final fuel value. In other words the injector pulse width will be increased (more fuel) to 'compensate' for the drop in Main Voltage, which is the supply to the injectors. Perhaps check that your battery and alternator are functioning as they should. Ideally you should expect Main Voltage to be 12.7 - 13.2 Vdc. I hope that makes sense.The long term offset on the even bank is at -98%!!
Is this normal??
If you ran data logging check the results for prolonged pulse width increases with corresponding Main Voltage drops.
davep said:
davelittlewood said:
Have a look the screen shots gents.
The long term offset on the even bank is at -98%!!
Is this normal??
Just a thought ... if this screenshot was taken with the engine running then the Main Voltage is on the low side, this can cause an additional adjustment value to be added to the final fuel value. In other words the injector pulse width will be increased (more fuel) to 'compensate' for the drop in Main Voltage, which is the supply to the injectors. Perhaps check that your battery and alternator are functioning as they should. Ideally you should expect Main Voltage to be 12.7 - 13.2 Vdc. I hope that makes sense.The long term offset on the even bank is at -98%!!
Is this normal??
If you ran data logging check the results for prolonged pulse width increases with corresponding Main Voltage drops.
I now think the screenshot was taken after a RoverGauge session and ignition switched off, engine not running, hence the trim readings are more than likely spurious. It'd be more helpful if a screenshot of the whole screen was taken with the engine running and Communications lamp showing Green.
Its only a problem when it hits 100%- its no different to turning the mixture screw on a carb- its fine until the screw falls out, or the trim reaches 100%. Ideally on a new engine with a good map it could be + / - say 5%, but things change over time, and the trim compensates accordingly, In your case Id try and borrow another AFM at some point, then do an ECU reset and see when the trim re settles, but I would not worry to much at this stage- its working within tolerances.
Cheers Alun,
I'm getting a new vac unit on Saturday from TVRPower so let's see if that makes any difference.
I always said that as soon as anything expensive packs up on either the ignition or the fuel injection then the whole lot goes in the bin and I'll take it to TVRPower for an MBE.
Talking of MBE systems, have they mapped your properly yet??
Should have given them half the money for half the job!
I'm getting a new vac unit on Saturday from TVRPower so let's see if that makes any difference.
I always said that as soon as anything expensive packs up on either the ignition or the fuel injection then the whole lot goes in the bin and I'll take it to TVRPower for an MBE.
Talking of MBE systems, have they mapped your properly yet??
Should have given them half the money for half the job!
I saw your vac unit while I was at Powers today Dave! Dom and Jay went out on the road to tweak it. The rolling road issue is a Pita but what can you do!
It's a bit better now so I'll just have to wait until the things fixed!
The installation is good, everything's working spot on and stuck in traffic today had me bothered not a bit!
Looking at some screen shots after Dom had been up and down the motorway confirmed my temp readings on the gauge are accurate and constant at 84deg. Fans doing there job on/ off and still constant temps
That knowledge alone is a breath of fresh air,,, the car before, the fans kicked in but not until the engine seemed at boiling point sometimes,,, it's all more consistant and I actually believe what I'm seeing and hearing and smelling!
The road is a huge fustration to me to be honest,, but I'm not the only one who's suffering because if it, I really wanted a trackday before October, but not before I know the map is fuelling correctly!
It's a bit better now so I'll just have to wait until the things fixed!
The installation is good, everything's working spot on and stuck in traffic today had me bothered not a bit!
Looking at some screen shots after Dom had been up and down the motorway confirmed my temp readings on the gauge are accurate and constant at 84deg. Fans doing there job on/ off and still constant temps
That knowledge alone is a breath of fresh air,,, the car before, the fans kicked in but not until the engine seemed at boiling point sometimes,,, it's all more consistant and I actually believe what I'm seeing and hearing and smelling!
The road is a huge fustration to me to be honest,, but I'm not the only one who's suffering because if it, I really wanted a trackday before October, but not before I know the map is fuelling correctly!
davelittlewood said:
Cheers Alun,
I'm getting a new vac unit on Saturday from TVRPower so let's see if that makes any difference.
I always said that as soon as anything expensive packs up on either the ignition or the fuel injection then the whole lot goes in the bin and I'll take it to TVRPower for an MBE.
Talking of MBE systems, have they mapped your properly yet??
Should have given them half the money for half the job!
Unfortunately the vac' unit has no part to play in the long term trim, as the vacuum port is shut off at idle, and this is when when the long term trim is set, although if the idle ignition timing is wrong it can have an affect.I'm getting a new vac unit on Saturday from TVRPower so let's see if that makes any difference.
I always said that as soon as anything expensive packs up on either the ignition or the fuel injection then the whole lot goes in the bin and I'll take it to TVRPower for an MBE.
Talking of MBE systems, have they mapped your properly yet??
Should have given them half the money for half the job!
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