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Matjam
I think your correct in what you are saying!, i'll ask Ron to confirm.
It's all good information and, i am sure, interesting to most readers!
What i didn't say on the long post is that other users who also had this engine remapped (by a wide range of companies) also had disapointing results. It appears that this particular BMW engine just didn't respond well to a remap.
Increasing the fuel pressure slightly does appear to give better results low down. I can only assume that this is due to better atomisation of the fuel. With a remap more fuel is injected by a longer pulse width which, again on this engine, just did not give the same results.
You are right that the tuning box only adjusts the fuel rail pressure signal - but, as you say, thsi does work and work very well.
Of course engines have moved on since this design and the current range of BMW engines do appear to respond very well indeed to a remap.
Bosch MAF's in my opinion should be a service item. The effect they have on performance and MPG is very significant. A lot of people with cars over 40k miles don't realise that the MAF has gone out of spec as it, in general, happens so slowly so goes unnoticed. I discovered that cleaning the MAF as often as every 3k miles made a significant difference., it shows how sensitive they are - especially in the winter when there is a lot of road spray. A lot of the contamination in the spray ends up on the MAF.
I also work for a manufacturing company in the UK. 90% of our business is expeort and I am the sales manager responsible for this, so well done to us all - the dying breed of UK manufactures!
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