relocating maf near TB on sr? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

samplesurf · 02-02-2007, 06:10 AM

alright so ive been looking through some mags lately and ive seen more than a few turbo g35s and 350zs and they still run their maf up there next to the throttle body in the pressurized piping, how is this possible and how does it affect driveability?it seems like it would be ok if u put the bov between the two... i can see this can be an advantage for us sr folks in situations like blowing off a coupler or somethin so u can still get somewhere u can fix it rather than being on the side of the freeway?also it would be able to more accurately measure volume and temp going directly into the motor, such as nitrous sprayed on the IC with the maf in the regular spot u may get a lean condition if u arent set up for it, but with the maf there it would be able to more accurately determine the fuel needed,.... any thoughts on this?

broken240sx · 02-02-2007, 06:15 AM

I think you are good to go with that...2 concerns

- blowby oil in your MAF
- z32 maf is plastic, may not be best boost piping at 30psi for example

drivability after a boost leak likely would be a huge advantage of that setup

samplesurf · 02-02-2007, 06:28 AM

Quote:

Originally Posted by broken240sx

I think you are good to go with that...2 concerns

- blowby oil in your MAF
- z32 maf is plastic, may not be best boost piping at 30psi for example

drivability after a boost leak likely would be a huge advantage of that setup

well shouldnt have any blowby as long as u have a catch can, and i do, also id only be boosting up to 20psi so it seems like it would work

yokotas13 · 02-02-2007, 06:55 AM

search blowthrough

i had a post like a month ago on this stuff. good informatin in it!

boost_it7 · 02-02-2007, 02:03 PM

Yeah, it's called a blow-through MAF. Sport Compact Car magazine had some issues with this setup on their turbo Ford Focus. Somehow, the airflow meter was getting really eratic readings. It turned out that the scavenging effect that happens in the manifold was being detected by the MAF, so at certain RPMs the reading was inaccurate. They converted to a pull-through style MAF and the problem went away.

I don't think you would have the same problem as the Focus if you put the MAF in front of the intercooler, or at least further from the TB.

GSXRJJordan · 02-03-2007, 06:11 AM

Ton's of hassle, as long as you're having to buy something, get a MAP-ECU and go the way REAL turbo cars do (as well as sportbikes), with a MAP sensor. Talk about worry free ~ plus no restrictions on airflow

O3DigitalBath · 02-03-2007, 10:15 AM

more tuning is involved with MAP baised and its not quite as accurate (only measuring pressure rather than flow)...but they are a hell of a lot easier to work with and are WAY cheaper.

GM 3bars are like $26 new at the auto parts stores...MAF's...closer to like 2-3 hundred.

02-02-2007, 06:10 AM	#1
samplesurf Zilvia Member Join Date: Jul 2006 Location: houston tx Posts: 230 Trader Rating: (0) Feedback Score: 0 reviews	relocating maf near TB on sr? alright so ive been looking through some mags lately and ive seen more than a few turbo g35s and 350zs and they still run their maf up there next to the throttle body in the pressurized piping, how is this possible and how does it affect driveability?it seems like it would be ok if u put the bov between the two... i can see this can be an advantage for us sr folks in situations like blowing off a coupler or somethin so u can still get somewhere u can fix it rather than being on the side of the freeway?also it would be able to more accurately measure volume and temp going directly into the motor, such as nitrous sprayed on the IC with the maf in the regular spot u may get a lean condition if u arent set up for it, but with the maf there it would be able to more accurately determine the fuel needed,.... any thoughts on this?

02-02-2007, 06:55 AM	#4
yokotas13 Post Whore! Join Date: Apr 2006 Location: Milford, CT Age: 40 Posts: 10,519 Trader Rating: (8) Rides Gallery: yokotas13 Feedback Score: 8 reviews	search blowthrough i had a post like a month ago on this stuff. good informatin in it! __________________ 2015 Subaru Outback Overlander - Wagonofdoom

02-03-2007, 06:11 AM	#6
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	Ton's of hassle, as long as you're having to buy something, get a MAP-ECU and go the way REAL turbo cars do (as well as sportbikes), with a MAP sensor. Talk about worry free ~ plus no restrictions on airflow __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

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02-02-2007, 06:15 AM	#2
broken240sx Leaky Injector Join Date: Jul 2005 Location: new york Posts: 111 Trader Rating: (0) Feedback Score: 0 reviews	I think you are good to go with that...2 concerns - blowby oil in your MAF - z32 maf is plastic, may not be best boost piping at 30psi for example drivability after a boost leak likely would be a huge advantage of that setup

02-02-2007, 02:03 PM	#5
boost_it7 Leaky Injector Join Date: Jul 2005 Location: San Antonio Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	Yeah, it's called a blow-through MAF. Sport Compact Car magazine had some issues with this setup on their turbo Ford Focus. Somehow, the airflow meter was getting really eratic readings. It turned out that the scavenging effect that happens in the manifold was being detected by the MAF, so at certain RPMs the reading was inaccurate. They converted to a pull-through style MAF and the problem went away. I don't think you would have the same problem as the Focus if you put the MAF in front of the intercooler, or at least further from the TB.

02-03-2007, 10:15 AM	#7
O3DigitalBath Zilvia Addict Join Date: Apr 2006 Location: ~Orlando, FL Age: 40 Posts: 664 Trader Rating: (1) Feedback Score: 1 reviews	more tuning is involved with MAP baised and its not quite as accurate (only measuring pressure rather than flow)...but they are a hell of a lot easier to work with and are WAY cheaper. GM 3bars are like $26 new at the auto parts stores...MAF's...closer to like 2-3 hundred.