Just checked ETKA and the one ending with "B" is for KR engines 1986-89 and I can`t find the one with no letter on end at all ????? Anyone else have any further info on this.
Its gotta be to do with pinkin.Ive fitted a vsam and i can map my ignition advance.When i bought it the chap gave me a number of maps i can use and most of them retard timing loads at 6k,making car feel like its hit a brick wall!!!.Ive managed to write and install a map that keeps pulling at 6k and feels so much better.
Most road cars run slightly lean at the top end, to get the best overall compromise, so it's not surprising if the timing needs to be retarded at high revs. @ Pigbladder - Someone told me once you had to retard the timing setting on early valvers to get them to run on unleaded - are you sure they weren't originally meant to run 4-star? I think all new cars in the UK had to run on unleaded from '88 or '89 onwards, so that would fit in with the change.
I thought you couldn't set a valver to run on unleaded without one of those K-star thingys. The problem with unleadedis the lower octane, they need a higher octane than standard unleaded rather than needing the lead itself. I run mine on optimax to get round this(is this the case or am I wasting 5-6p per litre???)
i think the best ECU to use if from a 90 spec Oak Green 3 door on BBS - they would invariably be the best ones VW could fit.
If you have the warm up regulator mod done to increase fuelling, you could get away with running 95 octane in all weathers on a KR , IanB who has a 200bhp 16v running on k-jet runs his on 95 all the time, mine pinks on 95 in the hot summers days we sometimes have
so are we agreed there is a difference between the late and erly ecu? would this have an effect on a valver on carbs?.... namely my valver on carbs?
Any valver - it only affects the ignition, not the fuelling. Though whether your vacuum signals would be "right" enough on carbs rather than k-jet for it to be beneficial is another subject.....
http://forums.vwvortex.com/zerothread?id=1563912&page=7 Have a look at bottom of page as someone has posted the standard ignition map for an 1800 16v
Well after road testing my old ECU fitted I have to say that the difference is remakably unnoticeable
