Problem with BOV

[Exhaust Depot]

Thats a wierd setup. If the ECU shuts down the injectors when you let off the throttle, then how does it idle if the injectors are off?


Or did you mean that the ecu shuts down the injector momentarily when it senses that the throttle closed?



IF this is the case, im wondering if the afc etc will work with the off throttle setup?

Hmm?

 

[Exhaust Depot]

.

 

[RX-KEVIN]

He is saying the car goes into fuel cut when the throttle is closed and the car is in gear, once the revs drop near idle the injectors wake up and the IAC takes over if it's not in gear

 

[Exhaust Depot]

Ah okay, makes sence now. The momentum of the car keeps the engine moving and prevents it from shutting down, got it, thanks.

 

[I-Am-Chris]

go figure. thx for the info

 

[perfworks]

in the majority of the other cars(especialy turbocharged eclipse)
upon deceleration or even gear shift (again with throttle not engaged) the ecu will continue to cycle injectors at the base idle and ignition rate .
the mazda ecu does the opposite. it will shut the injectors off until the cam and crank signals show the ecu preprogramed values of an idle condition. then it will cycle them back on. further more this takes a while.
i know its only milliseconds but thats what i mean about momentary because by the time you throtle up the ecu is trying to catch up because some idiot designed it to try and reach stoich readings under 4500 rpm.
its a ****** up system but they had no choice to pass CARB.
they were mostly relying on the realease of there new generation of 4 cylinders in the M6 and M3 to change all this s***.
i have a M6 and the change in there ecu design and performance is evident

 

[AFaceInTheCrowd]

well, uh stupid question, but what if we somehow moved the maf to after the bov? oh yeah and uhh perf, does the msp have this new gen of engine?

 

[Exhaust Depot]

well, uh stupid question, but what if we somehow moved the maf to after the bov? oh yeah and uhh perf, does the msp have this new gen of engine?

Actually,

That is a good question. That is called a blow through setup. The Eclips guys do that. They use a V8 MAF from a chevy or something like that. I am not sure if the stock MAF on the MSP will be happy. I will experiment with it to see if its a happy combination.

 

[AFaceInTheCrowd]

wow cool thanks Exhaust. But i wasn't thinking of swaping the maf, just moving it. so that it can get accurate air readings AFTER the bov. what would a V8 maf do to correct this problem?

 

[Exhaust Depot]

The V8 maf can handle more volume of air being that its a bigger diameter. I was not saying that you should swap out your MAF though. But I will see if i get some pieces of pipe together and setup a blow through design. Hopefully the car will be happy.


HEctor

 

[perfworks]

guys i use what they call a "blow thru".
but many people have different ideas of what this is.
a blow thru desin is mounted before the throtle body AFTER the turbo.!
it recieves an accurate reading to the exact amount of air and temperature going into the manifold. the problem is that if it is not properly designed you can not tune it with the factory ecu and even a piggy back.
it needs to be set to that particulas set up.
now if you mount the bypass pipe then the MAF then you are just sending a confusing reading to the ecu because your throttle voltage will still be at closed throttle momentarily.
but i have always said that without trying you cant be for sure so expirament with every idea no matter how stupid or against any theory it might go against.
thats the idea behind bieng a good tuner.
its trial and error.
please hector let me know how you make out.
later

 

[Exhaust Depot]

Perf,

I dont have an msp, so i have to see if the donor guy lets me experiment. I dont see how he can decline being that I will be making a hardpipe set for him.


Hec

 

[03Speed]

Hector, if that guy down by you wont let you do it, im down for drivin down to ft. lauderdale n lettin u try it out. plus i want to get the greddy profec b on my car

 

[Exhaust Depot]

Kewl, thats good to know! Ill get my hacksaw and hammer ready.

 

[AFaceInTheCrowd]

good luck hector! hope it works