Has anyone got a Dansak Unichip running on an Ecotec with the above ECU?
Iíve had one fitted today by a very respected mapper, well fitted then removed. They got the Unichip wired on the loom, but received no speed signal from ECU. Basically the modulation of the Simtec 56.0 speed signal (RPM) was not suitable, and the Unichip could not determine engine speed. They also checked I had the correct Unichip for engine, and tried another Unichip to ensure first Unichip was not faulty.
The tuners in question spoke the storm (Dansak UK) that confirmed the problem. I later spoke to Storm, and was a little confused by their answer. Iím told on phone by Storm some ECOTECís run on Monotonic ECU and thatís why some Ecotecís are suitable for Unichip Ė this really does not sound correct can someone confirm this?
Just like to say Iím very happy with the tuners who spent 6 hours trying to make the Unichip work. More a case of Storm who I phoned just before having the tuning done to confirm Unichip was suitable for car Ė of course they told me it was.
Car is 95 Cav Ecotec SRi (X20XEV) Ė not exactly the worldís rarest car Ė or at least you would think. If anyone had the Unichip running on same engine or can shed any light on above Iíd be grateful to hear it.
diid u put a scope on the signal? maybe needs a pull up or pull down resistor? where is the signal taken from? the crank sensor or the ecu rev counter output? if its the rev counter output autogas parts suppliers sell an rpm signal conditioning box to interface lpg conversion kits with less than perfect signals. i dunno if this makes sense because i`ve had a couple of
Andy has a point - we all know that those early ecotecs were just a 20XE really, mechanically at least - perhaps they also differ in a big way electrically too, from the later 'true' ecotecs - this is probably quite likely as the proper ecotecs came with a load of extra electrics - e.g Air pump for EGR
16vastra, thatís interesting. Did you find any way off resolving the problem, or did you give up on Unichip in the end?
The engine speed is coming from the Simtec. The problem is the wave. Simtec 56.0 has a spiked wave, where as Unichip needs a box (almost binary looking) type wave. The frequency of the Simtec wave could not be read by the Unichip. This resulted in an engine management light coming on and the Simtec then using the crank to pick up rpm. This is what I was told anyway.
We discussed in great length changing the Simtec ECU as there is some later Ecotec's (book lists them as Simtec 56.5) that work with the Unichip. I'm going against changing ECU as I think It could cause more problems then it solves.
CavvySRi, did think about asking is signal could be alerted, but for some reason never asked on day.
BTW my Ecotec is running lean - in fact there is very occasional knocking. I'm running Optimax and was told not to run anything less - thatís a standard engine on 56k miles! Goes to show how clean Vauxhall made those Ecotecs. No wonder there down on power over the old red top.
try an aeb386 rpm signal duplicator(£3.90) or an aeb387 rpm multiplyer/amplifier (£13.26) or a timing advance processor to interface the rpm signals. you can get these from autogas worldwide(0870 746 1262) just bell them and ask for advice.