It's great to hear you have done it better than Bosch engineers... No offense, but i have to disagree what you wrote. Tell me even one factory turbo car with Bosch Motronic & AFM which is configured as your car is? There is no doupt your system will work, but i suppose it will work even better in the way Bosch designed it. I have played about ten years with Porsche 944 Turbo, which has a factory Motronic & AFM with turbo. I have used few piggypacks with MAF & MAP sensors. Piggypacks i have used are SMT6 & AFM Link. SMT6 works better with MAF sensor. AFM Link has a built in 2,5bar MAP sensor.
may i remind you of your words !!!! these are Stock ( factory ) turbocharged cars with AFM.... So Motronic ( and i guess not motronic 1.7 as M42 ) is preset from the factory with a mapping to work like that... My , Our motronic 1.7 , i set to work in that exact place , with vacuum pressure only , the mapping is for stock car from the factory and not turbocharged...
think this only... the AFM is about 20cm away from the intake butterfly... when you press the accelaration petal , vacuum drags air and opens the AFM almost instantly...so the ecu knows that when the throtle is pressed almost instantly air get into the intake ( passing through the AFM and mesured by ) so it knows how much to spray for that air... if you change the possition of the AFM in front of the turbocharger , when you press the throtle , the ecu reads that you have pressed the throtle with the TPS , the AFM reads that air passed though it , and the ecu begins to spray , but the air that the AFM read is not inside the intake anymore , because it has to pass though the turbocharger , though the intercooler , through all the piping to get to the intake , is not 20cm anymore but 1,45m - 1,60m , so all that gasoline that the stock motronic 1.7 sprayed is useless for that specific time... so the engine will be working wrong and more fuel will be sprayed for nothing...Then in more rpm , lets say 2300 rpm , with the turbo spinning a lot , but vacuum still , ( pressure comes on in 3000 rpm and full boost at 4000rpm ) the AFM will read full vacuum because the air that the turbo sucks in is much more than vacuum stock car at full throtle , so motronic thinks that you are at full throtle with stock car , and sprays like you where at full boost , but you are only in 1/4 of the throtle and going with 2300 rpm...so more fuel will be wasted for nothing...All that becuse the AFM works with pressure diference between the 2 angles that it has...in front of the turbocharger it has vacuum from the turbocharger and atmosphere presure from the other way...but where i have it , i has vacuum pressure form the intake and not atmosphere pressure from the other , but the air coming from the turbocharger witch is always different ( depends on how you drive , how much throtle you have , and rpm ) so it reads more efficiently ... think about it...
there is a slight difference between stock turbocharged car and a car that was designed and mapped non turbo , and a crazy dude like me turbocharged it...
And finaly , Yes i have done it better than Bosch engineers , and BMW engineers because i have puled put 200 hp from a car the comes with 136hp from factory without problems , without damage , and with the less possible increase of fuel consumpion...
what do you say about that..
