can i mount my s14 MAF vertically, just before the throttle body? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dwadia · 03-31-2008, 09:20 PM

I think this would make for better overall fitment of my intake and IC piping. Is there any reason not to mount it vertically? And right before the throttle body?

If it's relevant, i have an s14 engine in an s13 chassis with a Blitz FMIC and stock s14 MAF.

*Nismoknightska-t* · 03-31-2008, 09:22 PM

it does not matter where you mount it..

dwadia · 03-31-2008, 09:34 PM

cool thanks.

GSXRJJordan · 03-31-2008, 09:36 PM

That's not exactly true.

I know you didn't mention whether your 'S14 engine' was a SR20 or KA, but when you mount the MAF after the turbo, it's called a "blow through setup". Our MAFs are not designed to be run like this, (they're designed to be "pull through", aka mounted before the turbo) and it requires tuning to make it work right on the stock MAF or a Ford Cobra MAF (the more popular choice).

As far as vertical vs horizontal, that does not matter.

bigOdom1 · 03-31-2008, 09:46 PM

but if you dont mount it far enough from the turbo you will get funny signals it has so far downstream but i cant recall the minimum amount

also you can hack your maf to be a blow through set up. people that do it either swear by it or quickly return.

slider2828 · 03-31-2008, 09:47 PM

It does matter. As per mafs spec there MUST be 3" of straight pipe before and after the MAFS. Doesn't matter if you mount vertically or horizontally.

bigOdom1 · 03-31-2008, 09:48 PM

i thought after the maf it had to be more than three inches

slider2828 · 03-31-2008, 10:55 PM

I think it could be, but I have heard 3"

Hey Big, you run SCCA? I see the SM sticker, why are you in SM and not DSP? I have SR Modded with Coilovers and I run DSP>

orion::S14 · 04-01-2008, 07:32 AM

Quote:

Originally Posted by slider2828

...I see the SM sticker, why are you in SM and not DSP? I have SR Modded with Coilovers and I run DSP...

You're in the wrong class.

Any Nissan engine swap = SM...there is no other class that allows a SR swap. (EDIT: other than X-mod, and those wacko classes)

..or KA-T for that matter.

But, SCCA leaves classing up to the member, so they don;t have to correct you. Someday, someone who cares will be in DSP, and protest you.

[/offtopic]

- Brian

projectRDM · 04-01-2008, 09:03 AM

The general rule of thumb is 18". 18" away from the throttle body, 18" away from the turbo inlet.

slider2828 · 04-01-2008, 09:55 AM

Thanks project..... but you do need certain amount of straight piping before and afte correct?

projectRDM · 04-01-2008, 10:14 AM

Quote:

Originally Posted by slider2828

Thanks project..... but you do need certain amount of straight piping before and afte correct?

Not really. The distance is to decrease turbulence, figure any bend will give the same flow no matter what it is.

greddyguy · 04-02-2008, 10:52 AM

I did an 89 ka-t with a blow through maf and it laid down 305whp. Maxed out the maf but it ran fine

projectRDM · 04-02-2008, 02:28 PM

Quote:

Originally Posted by greddyguy

I did an 89 ka-t with a blow through maf and it laid down 305whp. Maxed out the maf but it ran fine

Which has absolutely nothing to do with the thread. Good job, you want a cookie?

dwadia · 04-02-2008, 03:15 PM

Oh shit, somehow i thought this thread got only one response and never looked at it till now!! Well, it's for an s14 sr20det, sorry if i wasn't clear about that.

I already ordered intake piping to accomodate the MAF just before the throttle body (vertically, starting just above the battery tray). Without measuring, it probably has 8"+ of straight pipe before it, an immediate 90-degree bend after it, and 14" or so total piping before the throttle body.

If i run it like this, is there any chance of damaging anything? The only 2 possibilities i can think of are if the MAF will be damaged by the blow-thru setup, or if it may somehow cause the engine to run lean. Are either of these possible? If it's safe, at this point i'd just figure nothing to lose, i can at least give it a try. What do you guys think?

03-31-2008, 09:20 PM	#1
dwadia Zilvia Junkie Join Date: Sep 2006 Location: NJ Age: 42 Posts: 302 Trader Rating: (2) Feedback Score: 2 reviews	can i mount my s14 MAF vertically, just before the throttle body? I think this would make for better overall fitment of my intake and IC piping. Is there any reason not to mount it vertically? And right before the throttle body? If it's relevant, i have an s14 engine in an s13 chassis with a Blitz FMIC and stock s14 MAF.

03-31-2008, 09:22 PM	#2
Nismoknightska-t Premium Member Join Date: May 2007 Location: Azusa, socal baby! why do i live this way?? it must be the money! Age: 39 Posts: 523 Trader Rating: (3) Feedback Score: 3 reviews	it does not matter where you mount it.. __________________ NismoKnights Terrorizing Honda crews since 2003 ls2 powered kouki..all show and GO! putting it down on the streets and the track! LMAO V8 Nismokights on http://www.youtube.com/user/NismoKnights

03-31-2008, 09:36 PM	#4
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	That's not exactly true. I know you didn't mention whether your 'S14 engine' was a SR20 or KA, but when you mount the MAF after the turbo, it's called a "blow through setup". Our MAFs are not designed to be run like this, (they're designed to be "pull through", aka mounted before the turbo) and it requires tuning to make it work right on the stock MAF or a Ford Cobra MAF (the more popular choice). As far as vertical vs horizontal, that does not matter. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

03-31-2008, 09:46 PM	#5
bigOdom1 Nissanaholic! Join Date: Nov 2005 Location: Auburn/Birmingham AL Age: 41 Posts: 1,817 Trader Rating: (4) Rides Gallery: bigOdom1 Feedback Score: 4 reviews	but if you dont mount it far enough from the turbo you will get funny signals it has so far downstream but i cant recall the minimum amount also you can hack your maf to be a blow through set up. people that do it either swear by it or quickly return. __________________ my car domain that good review thread

03-31-2008, 09:47 PM	#6
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	It does matter. As per mafs spec there MUST be 3" of straight pipe before and after the MAFS. Doesn't matter if you mount vertically or horizontally. __________________ Turn and Burn!

03-31-2008, 09:34 PM	#3
dwadia Zilvia Junkie Join Date: Sep 2006 Location: NJ Age: 42 Posts: 302 Trader Rating: (2) Feedback Score: 2 reviews	cool thanks.

03-31-2008, 09:48 PM	#7
bigOdom1 Nissanaholic! Join Date: Nov 2005 Location: Auburn/Birmingham AL Age: 41 Posts: 1,817 Trader Rating: (4) Rides Gallery: bigOdom1 Feedback Score: 4 reviews	i thought after the maf it had to be more than three inches __________________ my car domain that good review thread

03-31-2008, 10:55 PM	#8
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	I think it could be, but I have heard 3" Hey Big, you run SCCA? I see the SM sticker, why are you in SM and not DSP? I have SR Modded with Coilovers and I run DSP> __________________ Turn and Burn!

04-01-2008, 09:03 AM	#10
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	The general rule of thumb is 18". 18" away from the throttle body, 18" away from the turbo inlet. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

04-01-2008, 09:55 AM	#11
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	Thanks project..... but you do need certain amount of straight piping before and afte correct? __________________ Turn and Burn!

04-02-2008, 10:52 AM	#13
greddyguy Zilvia Member Join Date: Dec 2007 Location: boise idaho Age: 37 Posts: 175 Trader Rating: (0) Feedback Score: 0 reviews	I did an 89 ka-t with a blow through maf and it laid down 305whp. Maxed out the maf but it ran fine

04-02-2008, 03:15 PM	#15
dwadia Zilvia Junkie Join Date: Sep 2006 Location: NJ Age: 42 Posts: 302 Trader Rating: (2) Feedback Score: 2 reviews	Oh shit, somehow i thought this thread got only one response and never looked at it till now!! Well, it's for an s14 sr20det, sorry if i wasn't clear about that. I already ordered intake piping to accomodate the MAF just before the throttle body (vertically, starting just above the battery tray). Without measuring, it probably has 8"+ of straight pipe before it, an immediate 90-degree bend after it, and 14" or so total piping before the throttle body. If i run it like this, is there any chance of damaging anything? The only 2 possibilities i can think of are if the MAF will be damaged by the blow-thru setup, or if it may somehow cause the engine to run lean. Are either of these possible? If it's safe, at this point i'd just figure nothing to lose, i can at least give it a try. What do you guys think?