fuel regulator

[daz the plumber]

does any one know where i can get a malpassi fuel regulator.its a linea type not rising rate cheers

[blitzracing]

Ive got one of those generic ones of ebay, and my fueling is spot on (although I think the pressure gauge reads a tad low). I assume you already have a fuel rail adaptor?


http://cgi.ebay.co.uk/NEW-BMW-E30-E36-E39-E46-FUEL...

Mark

[daz the plumber]

i have a riseing rate regulator from rpi but it seems to be running rich,ive beed adviced to get a malsappi linea

[blitzracing]

I had the same experiance with a rising rate unit. RPI or Demon Tweeks will sell you a linear Malpassi at great expense, but they dont do anything more than the cheaper ones. Up to you.

[daz the plumber]

so which linea unit would you use and am i wasting my time with a riseing rate thanks

[Meatball]

im using a fse rising rate on my 450 and it works just fine At 298 bhp

[blitzracing]

The problem with rising rate is the ECU's fuel mapping is worked out with the fuel pressure being fixed at 37-42 PSI above manifold pressure. When you boot the car the ECU puts a set amount of extra fuel in to maximise the power increase when its needed. If you use a rising rate, it then quickly "boosts" the fuel pressure to put even more fuel in. Combine this with what the ECU's already doing, and it simply over fuels, so you get no more (possibly less) power, and it wastes fuel. The ultimate continuous power is not controlled by the boost rate during acceleration, but by the final air fuel ratio, that is controlled by the ECU, together with the final settled fuel pressure, that is now no longer "boosted". You can still get a good final BHP, but no better than a linear unit thats set correctly. I have closely looked at the fuelling with a rising rate unit, and it’s almost impossible for the ECU to control the mixture as it should, and makes the fuel consumption worse. The rising rate units are really a relics of trying to get the best out of the older mechanical fuel injection systems. Personally my eBay unit is working just fine.

Mark