Forum

[Rattlebattle]

Dennis C: Yes, thanks for that. I know about the importance of getting the right cable. I bought mine from the recommended source so it should be ok. I've had TuneEcu for a while as I downloaded it for use on my Sprint GT. I'll wait until the warranty expires before using it on my Thruxton. There's loads of advice on the process and pitfalls on the relevant forums.

Jefrs: I did not intend to imply that TuneEcu works on the RE EFI; I don't believe it does. The Triumph user base is massively bigger than the RE one in terms of aftermarket tuning and the working of the EFI system is fully understood. I believe the later RIde by wire EFI systems on Triumphs are locked, presumably because Triumph is fed up of owners avoiding excessive fees just to have fault codes read. BTW there is a interesting article in the current issue of MCS and Leisure about Euro 4. One of the things mentioned is the standardisation of diagnostic sockets to OBD 1 (ie a bike version of OBDII that has been compulsory on cars sold in Europe since the early noughties). Not before time in my view.

[jefrs]

For Thack, first attempt at posting a video, link is https://www.youtube.com/edit?o=U&featur ... 4pvCvA5Jl4 showing Dynojet software with PCV and AT-200 on RE Classic EFI-500 at idle, Here we can see the AT-200 controlling the AFR, readout of AFR from Bosch O2 sensor and fuel correction used to to that and pulse duration for that (I assume millisecond but Dynojet do not state units)

I shall now attempt to embed the video as an image. If this fails follow the link at top.

[jefrs]

Try again

[jefrs]

One more go - then just use the link

[jefrs]

And it works! but it was completely the wrong file, mutter ...

[Rattlebattle]

Meanwhile, think I'll just give my mixture screw a little tweak.......

[jefrs]

Actually my last post (ok I botched the embedding) was regarding the pulse duration to help Thack with his college project.

[Thack]

Thanks, jefrs, for those. I'll study them tomorrow, but I wanted to say thanks straight away.



For what it's worth, I'm now satisfied that the injector does NOT use the "pulsed holding current" method, because the pulses seem to be spaced much too far apart.



I'm developing some software at the moment which will nail the precise timing of these multiple pulses, so will report back as soon as I have the data. We can throw that into the melting pot, along with jefrs's stuff, and see what we make of it.



More soon.

[jefrs]

Thack, if there is any other data I can help with then please let me know. Jeff.

[Thack]

OK, I've got some results which will be heading this way in the next few hours.



In a nutshell:



1/ Some of the time it injects twice per cycle (cycle = four strokes / two crank revolutions). When it's doing that, the pulses are both centred on TDC. One occurs at the top of the compression stroke, as the combustion is actually taking place, and the other occurs round about the top of the exhaust stroke. The pulses are not usually of equal length, but their combined length is related to the throttle opening.



2/ The rest of the time it injects once per cycle. In this case, the pulses appear to be asynchronous. I've found most seem to occur across TDC on the compression/power strokes; i.e. against a closed inlet valve when combustion is taking place. Occasionally it gives a pulse which ends before TDC on the compression stroke, and occasionally it gives a pulse on the power stroke, which starts after TDC.



I'm preparing some graphs to show you, and will upload them later.



Interestingly, I haven't recorded an injection pulse occurring during the intake stroke. So far, each pulse has been against a closed intake valve. This is actually fairly normal - it gives the fuel longer to vaporise in the warm inlet tract before being drawn in.



A caveat: all measurements this time were recorded with fairly small throttle openings and low rpm. Previous measurements suggest the same behaviour throughout the throttle and rev ranges. Also, the measurements were taken with a warmed up engine - there is no cold running data in there.



Once I've uploaded the graphs we can pick over my findings and see if they shed light on anything. They might not!