Timing Drift - Autronic Ecu

[roba]

I am trying to get my RB30/25DET running using a plug in Autronic ECU.

We have it running ok, BUT went the engine rpm is increased the ignition timing

increases correspondingly.

ie

idle 0deg, 3000rpm 20deg

idle 10 deg 3000rpm 30 deg

the timing keeps advancing further the more we rev it.

It is not mechanical as all new belts, idlers, etc, and has run on std ecu ok.

A friend is helping with the tuning and he thinks its not the ecu as he has the idle map, and timing map, and ignition mean angle all the same - 10deg i think.

He has tried different cyc trigger edge, digital angle filter, sync, and a lot of other shiit i dont understand.

nothing changes - still advances with rpm.

the CAS has had a 6 pulse gear tooth sensor installed by our local NZ distrubutor - who also has no idea why it it doing this...

any ideas would be greatly appreciated

cheers rob

[STATUS]

does it double again from 3000-6000rpm? ie is it 40deg at 6000rpm?

[roba]

It keeps on advancing well past 30deg with revs, have not reved to 6000rpm tho - didnt think this would be a good idea.

changed the CAS, no differance.

[Guilt-Toy]

is this a feature in the ecu i wonder?

[Adriano]

You could try putting a scope on the cas, it may need pull up resisters on the signal wire to clean up the signal. So the ignition maps are all set flat?Have you set the maps to zero and downloaded it to the ecu? Sounds like it could still have the base map in it and is advancing like it should

Edited January 27, 2008 by Adriano

[roba]

You could try putting a scope on the cas, it may need pull up resisters on the signal wire to clean up the signal. So the ignition maps are all set flat?Have you set the maps to zero and downloaded it to the ecu? Sounds like it could still have the base map in it and is advancing like it should

All maps set to zero.

Put scope on CAS, apparently ecu is not changing anything.

This is real fustrating, its been a few years in the making and I just want it to go...

[

[Adriano]

Sorry mate got me stumped, looks like i neat setup, just ope you have some spacers/washers behind the cas, or it will break the cas when bolted down, common problem when not running a cover.

[RB30-POWER]

ring ray hall and ask him or post on the autronic forums, if you have a legit autronic serial number to sign up with.

[roba]

tried ray, he's stumped as well...

[RB30-POWER]

you need to find someone with another autronic ecu, load their map into your ecu and see if it runs their car properly, to work out if its an ecu hardware/firmware issue or a engine mechanical issue.

speaking of which tried upgrading/downgrading firmware if thats possible?

Edited January 28, 2008 by RB30-POWER

[Zoltarc]

What edge are you firing the igniter on? Rising or falling? Have you set them to constant duty or constant dwell?

You say the CAS now has 6 pulse gear tooth. I assume this is now using a magnetic trigger? What edge are you triggering off?

Just to be sure, does the ECU have a timing lock function?

[Adriano]

Pretty sure it will be optical pickup. Check dwell as Zoltarc said, and should be -ve edge ignition output, although as a plug in, all this should be setup already

[roba]

FYI

Solved the problem.

It was the timing loop in the factory wiring loom giving the faulty readings.

We hooked the timing light onto coil No. 1 and bingo - sweet as.

cheers rob

[RB30-POWER]

haha, yeah, that loop is usless unless you have the nissan timing gun i reckon.

i remove no 1 coil and fit a inline ignition lead and clamp my gun pickup onto that.

safest and easiest way for correct readings.