injector pulse
3 things make for smooth and reliable engine operation with any engine.
Fuel
Air (boost)
Timing
You cant change one without changing the others. (you can, but with bad results)
All 3 things are controlled by the ecu, so the changes need to be made through the ecu (chip)

Too much boost with a mbc will create a lean condition which can cause detonation (engine grenade)
Too much fuel causes a rich condition (misfire,fouled plugs, reduced 02 sensor life,clogged cat, built up carbon deposits
Timing is adjusted constantlydepending on how much boost and fuel are requested to ensure complete and on timecombustion for every crank of a piston.... Errrr something like that.....

 

The fpr has nothing to do with the computer adjusting the amount of fuel being put into the cylinders. The fpr just makes the fuel pressure a stable constant pressure that the injectors can handle(they are just an open and close valve that lets fuel through). Fuel pumps cannot make a constant pressure, they can spike and make too muc pressure for the injectors to handle. And I never said anything about fuel economy. The maf and the 02 sensors just tell the computer how much air in entering the engine, and if it has the correct air fuel ratio. Then the computer calculates how long to open the injectors, thus the amount of fuel that is added.

 

Since you guys believe what you say then you gota have first hand experience. Can someone direct me to a link where a MBC has caused nothing but bad things. Any testimonies from anyone???

 

So you dont need a chip for the computer to do this rite??? And i didnt say you said fuel economy. The guys who chip it say that.

 

I don't have a link, but I have seen a guy in an acura turn up his boost about 4 psi more then he had a program for and every time he hit the top of the boost range the air fuel meter dropped into the red. It was getting into a range of about 11.5:1, dangerous. he later turned it back down so it wouldn't do any damage.

 

it is probably not well doccumented here or any online forums.. when these cars first came out and were tuned, endless things were tried.. so it would be very hard to source a thread or link from 97 or 98

it may have even started before with older audi's

 

Theoretically you could just turn the boost up VERY slowly and the computer could adjust for it, as long as it didn't go out of the adjsment parameters and give you a lean condition code. But you can do whatever you want, so go for it.

 

If the car runs lean is it possible to put in a higher barFPR and adjust the fuel mixture to bring it right???

 

No one is trying to convince you about a theory, we are trying to explain facts. If you up the boost too much with a mbc on a 97-99.5 (AEBengine) it will cause detonation and your engine will throw a rod. If youtry it on a 2000+ engine,you will go into limp modeto prevent any significant damage to your engine due to your stupid mistake. But go ahead and find out the hard way: http://ecstuning.com/stage/edpd/page...category=Turbo

 

The stock 4bar can handle 18psi. but you can't adjust the fuel trims on your own.