What MAF are you using?

It is great to have a charged MAF, close to the TB! Only thing you have to be careful is air hitting the throttle plate and causing a rich condition when it moves around on the MAF causing it to doublecount. I ran blow through MAF on my Maxima with great success... but I was only running 10-20psi. I would be a little worried about 30psi+ on a plastic housing MAF. (not sure what your plans are)

Also, remember if you get any kind of intake track backfire - that will most likely be first to go (Atleast from my experience.. with additional injectors and nitrous)

 

OH DAMN!
nice setup :bigthumb:

pretty cool idea, wonder why no one else every moved the MAF to the intake pipe instead oo before the turbo......

I've thought about it, but I figured there must be a reason why it wasn't done before, or maybe it just won't work. Doh!

makes since that it's acuratley measuring only air going into the engine now.

wonder if there's any drawback to having the sensor exposed to the the pressure and heat of the boost...???

 

Thanks DM for your concern/advice.
I'm running the stock Hot-Wire MAF from a 96 SC300.
It's 2.5" in/3" out.
I'm running everything stock so boost will probably never see 2 digit figures.

~Alan

EDIT:

OH DAMN!
nice setup :bigthumb:

Thanks!

pretty cool idea, wonder why no one else every moved the MAF to the intake pipe instead oo before the turbo......
I've thought about it, but I figured there must be a reason why it wasn't done before, or maybe it just won't work. Doh!

I was wondering the same thing, and now I've proven it works.

wonder if there's any drawback to having the sensor exposed to the the pressure and heat of the boost...???

Probably a bit more stress on the MAF but I think worth the benefits for sure!
Worst case scenario: MAF goes out a bit earlier than it would...used MAF on a NA supra is like $50.

WARNING: If you decide to use this setup, DO NOT, i repeat DO NOT run your turbo without an air filter.
Even small particles at a velocity this high will not do any good for the MAF.

 

I heard oil from the turbo will not be good for the MAF?

 

Why is oil coming out of the intake side of your turbo?

 

I was under the impression that there's always going to be a little bit of oil that gets into the intake stream... that's why you find oil in the intercooler over time?

 

I was under the impression that there's always going to be a little bit of oil that gets into the intake stream... that's why you find oil in the intercooler over time?

Thats true

but you can reduce it with a filter in one of the vacum lines that goes from the valve cover to the intake turbing

 

SPORTcoupe:
how much boost are you running?
any leaks around the sensor housing?

 

Did the blow thru rthing on an OBDII just a couple days ago. Will post pics soon

 

oil from turbo kill your MAF soon....

 

Thats true

but you can reduce it with a filter in one of the vacum lines that goes from the valve cover to the intake turbing

I don't reroute that dirty air into my intake. I put a breather on the valve cover.

kmn5: Boost is now set at a low 5-6 psi
There are no leaks whatsoever thanks to the couplers and T-Bolts from http://hightempsilicone.zoovy.com/
All of my couplers have come from Jim and they're top notch material.
I can also get you a 10% discount if you're interested.

~Alan

 

wait...so quick summary...

Blowthrought works on the obdI MAF's based on that pic?

hmmm....

i've seen it before also..but can anyone 100% vouch for this working?

 

oil from turbo kill your MAF soon....

I guess that depends on your definition of soon. I ran over 30,000+ boosted miles...
even once destroying a turbo which coated my IC pipes with oil.

 

where is your BOV located?

 

so how does the maf react to the boost?? does it run perfect?? or will it drop rpms after you let off of rev?? when i 1st got my nat on i had problems with the maf being too close to the turbo and it was causing my car to drop rpms way too low and cut off. i like the idea of the maf right after the throttle body... it would be nice running an atmospheric bov.

 

when you say bad cold start what exactly do you mean?

 

Blowthrought works on the obdI MAF's based on that pic?
i've seen it before also..but can anyone 100% vouch for this working?

If you're talking about the last pic, then yes, it works.
I can't personally vouch because I don't have OBDI, but I talked to the guy who's car is pictured in the last pic and he's the one who convinced me to try it.
His works perfectly.
One piece of advice for anyone trying this on an OBDI MAF:
Don't put the MAF right after a bend in the IC pipe.
The OBDI MAF measures the incoming air by calculating the Vortexes produced.
Air that has just gone through a 90* turn is very turbulent and will not read correctly.
Put the MAF after at least 6 inches of straight pipe.

so how does the maf react to the boost?? does it run perfect?? or will it drop rpms after you let off of rev??

It runs absolutely perfect. I will have some Wideband graphs to show the difference soon.
The reason your RPM was dropping off is because you were flooding the car with gas.
This happens to everyone who sticks the MAF on the intake of the turbo, and vents their MAF to atmosphere.

when you say bad cold start what exactly do you mean?

I mean the car develops a random missfire so bad that the car shakes violently and the Check Engine light comes on.
I highly recommend against the Dec Air feature of the SAFC-II.

I've put about 200 miles on this setup this weekend and so far, nothing but
Turbo is definitely spooling earlier.
I see first +1psi at 2800 RPM and full boost by about 3000 RPM.

I recommend this no any and every NA-T.

~Alan

 

i wish i had known then before i went and bought a VPC, sigh o well.

 

VPC has it's own benefits. (Larger injectors, no MAF whatsoever, etc...)
I'm just cheap.

~Alan

 

Just want to post the before & after pics in case people don't get what the deal is.

BEFORE:

AFTER: