When i had my MAF sensor next to the air filter, even after tightening the dump valve spring, the MAF has still monitored for the air going out the dump valve, so i was getting big overfuelling, and backfiring out the exhaust, and black smoke!! And a big carbon build up in the exhaust. As soon as i moved the MAF next to the throttle, it all stopped, the spark plugs werent getting the sooty coating, the lambda werent getting the sooty coating, and there was no more bogging down after gear changing, or backfiring. I cant speak for any1 elses car, but mine has definately made a big difference. The way i see it, it cant harm your car if you put it next to the throttle body, as alot of turbo cars have the maf inside the intake manifold for these exact reasons!
Yeah, i think your right about it leaning out mid/top of rev range, as the N/A engine regulator only works off vacume, so id have thought that it allows the same amount of fuel through when on boost, as when its at 0psi! If i get a rising rate regulator as BlackKnight suggested, it should increase the fuel rail pressure according to boost, and keep the fuelling adequate. I know this isnt the "ideal" way to do it, as getting an aftermarket ECU and getting it mapped to sort out the fuelling would be the correct way, but its way out of my budget, and im not going for major power, and in my opinion, the cost of these ecu's and getting them fitted, and then rolling rd time to get it mapped, just isnt justified for the power im looking for. If i was going for 300 or 400bhp, then spending £2500 getting it set up is still alot, but more worth it. Id be better off selling the Puma as standard, and buying a faster car!!My car with the standard engine, with the racing puma map, full milteck exhaust with sports cat, cosworth brakes, and fully polly bushed would be worth at least £2500 to someone, so adding the price of fitting an aftermarket ECU, i could get something alot quicker! I just want something more driveable, at a reasonable cost!