where can i put the maf with turbo on xb models
on the throttle or to the turbo plz let me know and ideas thanks

 

pre turbo....on the intake of the turbo. I am sure thats how you do it since thats how you do it on every other car that is boosted with a maf

 

i saw the zpi turbo kit the maf is on the trottle body why??

 

i dont think it is. I could be wrong but every other turbo kit in the world that is used on a MAF car, the MAF is put on the intake of the turbo. Are you sure, send me the pic or post it up here.

 

[/img]

 

if the maf is positioned by the tb after the turbo the maf is ready compressed air and is innacurate, zpi is very talented at modifying the airflow through the maf housing to in a way "recalibrate" what the maf sensor sees so that it is accurate. I belive they did it this way so they could remote mount the turbo for heat reasons.

 

Ok which is better let me know plz on tb or inlet turbo

 

Wrong.

You can run a blow through maf just fine. Every turbo 3800 Grand Prix runs a blow through maf. Not all maf's work the same way. Some play well with blow through, some don't.

To the poster... the closer the maf to the TB the better. If it doesn't run well, moving it to PRE turbo isn't that hard to do. Both will require messing with your emanage to get the right tune anyway. I would want it as close as I can get it to the TB though.

 

more answer or opinion plz and thanks alot gus

 

AWESOME! Thanks for the clarification. Like i said, "i could be wrong". I am just relating to dsm's or nissans. I have never boosted anything else that runs a maf. Mostly just MAP cars. Thanks again.

 

No problem and I hope you didn't take it as an attack.

You might want to leave 'in the world' out of statements you are not to sure about.

 

i remember seeing once in the list of zpi's xb kit that it is a "zpi calabrated maf pipe" or something like that not 100% sure but ya.

 

what u mean with calabrated maf pipe

 

I don't know the exact science behind it.. but some MAF's calculates airflow by measuring the temperature drop between two elements in the MAF itself. One is heated and one isn't if I recall. It uses this temperature difference value and using a lookup table in the ECU can calculate how much air is passing by the MAF. If you make the pipe larger or smaller that the MAF is in, you can skew that measurement. You can trick the maf into calculating more or less air by decreasing the velocity of the air that passes over the MAF (larger tube) thus having a lower temperature drop over the elements and having less air be calculated.

By doing this, you can have it 'see' less air than it is getting and run a larger injector. When you install larger injectors and cannot modify the ECU code directly, it will still pulse, say 10ms for a given amount of air on both the small and large injectors. This poses the problem of running too rich because the PCM is keeping the new larger injector open to long to supply the right fuel. Instead, it should pulse it at say, 5ms to achieve the same flow as the smaller stock injector at 10ms.

If you make the MAF see less air, it will pulse the 'stock' injector at a shorter interval, say 5ms, even though the amount of air that is coming in requires a 10ms pulse. You correct this by running the larger injector. Now the ECU is pulsing the larger injector at 5ms which will give it the proper amount of fuel for the amount of air entering the engine, even though the MAF 'saw' less.


The long and the short of it.. is you mess with the pipe that the MAF is in to get it to see different quanitities of air so you can run larger injectors and have the fueling be right.

*** I have never done this myself as tools exist on the cars I work on to modify the ECU code directly making this unneeded. If I am way off base here please let me know. This is all based off of what I have gathered in my reading and experience with how most (not all) MAF systems work. ***

 

more ideas of maf position on turbo

 

another ideas plz
want to know if do the same thing put on the throttle or in the turbo inlet
is the same reading plz help

 

It will read the proper amount of air no matter where you put it... however, some MAF's (and I don't know why) do not like presurized air going through them.

Instead of waiting for an 'answer' from here... put it as close to the TB as you can (that means, AFTER the turbo) and run a very low amount of boost and try it out. Keep upping the boost slowly to make sure it's running right. If not, try it PRE blower.

Sometimes you just have to find out for yourself as someone may not have tried it before you.... so figure it out and you tell US!