Thread: Naturally Aspirated MAP sensors + boost

that has confirmed what i've 'heard' from a mates mate, friend, who knows a guy, that uncle did.... i just didn't want to suggest it for being shot down as i had no proof.. as i have always been saying i don't really want to run much more than a couple of psi.. it's not a race car.. it's just a ae92 csi i got back off my oldies, as i gave it to them a few years ago.. it's like a 2nd daily.. thought i...

norbie is just arrogant because he has a 1GZ but that's certainyl the first time i've heard him recommend a microtech so maybe he's changing

Everything described so far in this thread is dodgy as fuck. Microtechs are cheap. Definitely cheaper than a melted piston or a bent conrod.

going by that ^, it looks as if it may read slight amounts of boost. But really why bother? With the amount of time you will spend to get bugger all power increase... you could do something much more profitable.

using an NA ECU for boosted use is just plain retarded. 7M-GTE MX73 is 100% correct about MAP sensors. It's not just extra fuel for boost - you have timing issues to consider and the extra fuel use is dependent on MAP not just RPM - so upping rail pressures is not a 'cheap' solution. Get some form of 2nd-hand aftermarket ECU and do it properly.

I think you'll find it's more a case of the usual things required to get a NA ECU work with boost are so f'ing dodgy even a Microtech IS better. The 4AGZE ECU has merit though.

Would you believe I have a plot of a 4afe map sensor? Cheers Wilbo

Map sensors regardless of the map range usually output a 0-5V signal. (This is a gross generalisation as in practice there is some deadband at each end for error generation). i.e. 1 Bar Map sensor = 0V full vaccuum, 5V 1Bar 2 Bar Map sensor = 0V Full vaccuum, 5V 2Bar etc. So basically no you can't use a boosted map sensor. A one bar map would most likely not even register a positive pressure and if it did the ecu would likely not be tuned...

Emanage blue with optional 3 bar map sensor.