Pavlo

As per Andy Fs discussion, thought it better here.
Andy,

This goes back to Johns musings on the subject a while ago. The problem is the MAFs are non linear, so you can't simply add voltages. What you could do is add some controller that linearised their output, summed it, and spat it out as a linear signal. The calibrate the MAFs in the ECU with a linear signal rather than the curve currently used.

The above is based on the assumption that the MAFs could have significantly different flow through them that the voltages couldn't be accurately summed, which is probably the case.

I am no microcontroller guru, but I think it should be quite easy as we know the curve for the MAF sensor, even if I don't know the units, doesn't really matter provided the proportions are correct.

I assume the 2 turbos will feed a common plenumn? If not, probably best to use 2 ecus and feed 8 injectors



[Edited by Pavlo - 8/19/2002 2:44:10 PM]

Andy.F

I have considered using twin turbo's with 2 OEM MAF's, 2 OEM ECU's and 8 std injectors, one ECU supplying the ignition map which would need completely re-done due to its MAF measuring only 50% of the air flow.
You could switch between ECU's for timing maps, one for pump fuel, one for race fuel Synchronising the wastegates on the turbo's would be very important to balance the flow between the MAF's

All you would need is some gash secondhand OEM bits, no fancy ECU's, big Injectors or hybrid turbo's
Of course a pair of decent re-maps would be the key

Pavlo

i was considering just a bigger MAF sensor, as the standard unit it pretty small. Anyone know of any alternatives that they can get the flow info for?

paul

Pavlo

hmm, these people seem to have some interesting products, how about a 200mm diameter MAF sensor?!?!

http://www.pro-flow.com/

They sell each sensor with a calibration sheet.

Paul

Andy.F

Mmm, nice, the 80 pro model should do ok with an 800 bhp limit