Thread: TD5 cylinder Balancing

each injector has a 2 letter code assigned to it at production. this is then entered into the ECU via whiteman magic and from that point on hypothetically all injectors inject the same amount as directed by the ECU.

Originally Posted by Graeme

Does the ECM dynamically achieve this, or is it preset using Testbook etc? If by Testbook, what does the process involve?

I'm exploring engine vibration problems and the possible causes.

TIA,
Graeme

Out of interest, the ECU chip that I was running on the Hay River trip was causing greater engine vibration and noise in some rev bands under higher load. I've since changed to a milder chip and the problems have gone. Based on this, the ECU does seem to have an impact on the smoothness of the motor.

Originally Posted by Slunnie

Out of interest, the ECU chip that I was running on the Hay River trip was causing greater engine vibration and noise in some rev bands under higher load. I've since changed to a milder chip and the problems have gone. Based on this, the ECU does seem to have an impact on the smoothness of the motor.

I very briefly (30 seconds?) drove another chipped manual TD5 on that trip while at Lake Caroline and I immediately noticed the smoothness and liveliness of its engine.

I am aware that cylinder balance checking can be performed, but don't know the process or what can be done about any inbalance. Interestingly, the user manual for the Nanocom unit mentioned in another thread shows cylinder balance figures for individual cylinders of -2, -2, 0, 2,-1

The balancing is dynamic...

Next second that image could be 5 -2 -1 3 -7

Thanks Tombraider. I was wondering what those values actually meant but hadn't gotten round to asking the question yet

resurrecting a rather old thread... Nanocom guide suggests that values outside of -4 to +4 indicates that all is not ok with the injector. Does this mean that considerable variance between injectors isn't a problem as long as it's not outside of this range? I'd be curious to know what readings other people are getting as I've got some -5s...

Actually the figure is closer to + or - 15, that is when the ecu will actually log a fault. A constant high number on one cyl can also indicate engine problems.

JC

yes...I just discovered the below, so my figures of +/-5 are nothing to worry about. Airflow is 50kg/hr, so that's all good. MAP is filthy, so will give that a better clean-up on weekend and maybe run disconnected to see if that affects running at all... Have started to hear fuel pump...so another thing to sort out...


"The power balancing rpm is useful to show an injector that is playing up. Normally the figures vary from about -10 to +10. A duff injector will show a large numerical value, 35 or whatever when the others are in single digits.

If the ambient air pressure reads 0 then the ECU will not compensate for altitude. This doesn't matter much even at 5000 feet. The problem is that a new sensor is a ridiculous price, make sure you are sitting down when you ask a stealer.

Air flow is useful - it should be about 47kg/hr at idle going to over 300 under power. If it reads 0 or never changes your AFM is stuffed, which is common.

Most of the other stuff is of no real interest."