Stock Maf Limits

Mitco39 · 09-08-2014, 01:45 PM

Good question, I would think increasing the piping to much just in one spot will change the flow profile of the tubes. Not to mention you slow the velocity of the air down as it hits the larger boost tube only to ram it as fast as you can back down to 2.75" and through the TBs. If you could find a way to get bigger throttle bodies (maybe off a titan? have no idea if nissan has larger TBs) then you might be onto something. lol.

phunk · 09-08-2014, 02:11 PM

I have never personally tried it, but I am under the impression that the loss of resolution at lower airflow can make it difficult to tune low-load areas of the map. Where that comes into play, I am not sure. But I think the 03 Cobra guys start with like a 3.5" MAF tube and upgrade to like 4-4.5" since they are pull-through.

I wonder if there could be an easy way to just sort of restrict how much air actually passes through the MAF sensor, rather than having to put it in a larger tube?

Mitco39 · 09-08-2014, 02:34 PM

Quote:

Originally Posted by phunk

I have never personally tried it, but I am under the impression that the loss of resolution at lower airflow can make it difficult to tune low-load areas of the map. Where that comes into play, I am not sure. But I think the 03 Cobra guys start with like a 3.5" MAF tube and upgrade to like 4-4.5" since they are pull-through.

I wonder if there could be an easy way to just sort of restrict how much air actually passes through the MAF sensor, rather than having to put it in a larger tube?

I dont think you would have that issue myself. At lower airflow the car is running in closed loop anyways so the MAF is not really watched at all anyways. All you would have to do if you were having issues at lower load is just pull the car out of closed loop later and let O2s deal with the resolution down low.

It was discussed a bit earlier in here that you can just move the maf closer to the wall of the tube and because you assume laminar flow through the pipe the velocity of the air moving near the wall will be less.

I think if you go to big you will cause turbulence in the piping since they are relatively short to begin with and you need that smooth flow to be able to accurately meter it.

Mitco39 · 09-08-2014, 03:32 PM

Quote:

Originally Posted by phunk

I have never personally tried it, but I am under the impression that the loss of resolution at lower airflow can make it difficult to tune low-load areas of the map. Where that comes into play, I am not sure. But I think the 03 Cobra guys start with like a 3.5" MAF tube and upgrade to like 4-4.5" since they are pull-through.

I wonder if there could be an easy way to just sort of restrict how much air actually passes through the MAF sensor, rather than having to put it in a larger tube?

Also on a side note your fuel kit is working awesome. It holds 65+ PSI all day under boost with no signs of slowing down. All this wouldn't be possible on the stock system.

BBRSpeedWorks · 09-08-2014, 06:02 PM

these are the 3in charge pipes i made with the tall maf slots sorry there not powder coated yet and with testing last night and some today( on 24hr duty right now) there running 4.2 volts at 12 psi. i'm not running an exhaust right now.

TopgunZ · 09-08-2014, 06:50 PM

Nice work! How tall are those standoffs?

TopgunZ · 09-08-2014, 06:53 PM

So if the sidewall slows down the air.....what if you made that sidewall slow it down more. What about roughing it up?

BBRSpeedWorks · 09-08-2014, 07:41 PM

Quote:

Originally Posted by TopgunZ

Nice work! How tall are those standoffs?

when i get home i well check how tall the are...i know they put the opening of the maf at the very edge of the pipe

Mitco39 · 09-08-2014, 08:43 PM

Quote:

Originally Posted by BBRSpeedWorks

when i get home i well check how tall the are...i know they put the opening of the maf at the very edge of the pipe

Very nice! That should give you more headroom than me.

BBRSpeedWorks · 09-08-2014, 09:04 PM

well see i got to play with the tune some more...i and stop turning up the boost i started at 7 and started going up...but i hope this sloves the problem

BBRSpeedWorks · 09-23-2014, 05:27 PM

here is a pic of the pull from my base tune on 10psi and you can see my MAF's don't get over 4.12 volts.....

TopgunZ · 09-24-2014, 08:15 AM

How tall are those standoffs again? And what were your volts at 10psi before the mod?

BBRSpeedWorks · 09-24-2014, 11:56 AM

In tall and idk cuz this was my first configuration..I know one thing that helps is the shright part be4 the maf

COSMO · 10-29-2014, 10:01 AM

Did some logs yesterday and it seems my stock maf's are almost maxed out right at 17psi with the gtm tt kit. 3" intake tubes. GTM knew that, that's why they went with bigger intakes..

Patrick@AAMComp · 10-29-2014, 10:25 AM

If any of you need upgrades, I can get you a good deal on our Z-MAFs.

09-08-2014, 01:45 PM	#1 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 133	Good question, I would think increasing the piping to much just in one spot will change the flow profile of the tubes. Not to mention you slow the velocity of the air down as it hits the larger boost tube only to ram it as fast as you can back down to 2.75" and through the TBs. If you could find a way to get bigger throttle bodies (maybe off a titan? have no idea if nissan has larger TBs) then you might be onto something. lol. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

09-08-2014, 02:11 PM	#2 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,669 Drives: 370 Rep Power: 974725	I have never personally tried it, but I am under the impression that the loss of resolution at lower airflow can make it difficult to tune low-load areas of the map. Where that comes into play, I am not sure. But I think the 03 Cobra guys start with like a 3.5" MAF tube and upgrade to like 4-4.5" since they are pull-through. I wonder if there could be an easy way to just sort of restrict how much air actually passes through the MAF sensor, rather than having to put it in a larger tube? __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

09-08-2014, 06:02 PM	#5 (permalink)
BBRSpeedWorks Premium Member Join Date: Dec 2013 Location: Ft. Stwart Posts: 366 Drives: 370z,350z,300z,talon Rep Power: 13	these are the 3in charge pipes i made with the tall maf slots sorry there not powder coated yet and with testing last night and some today( on 24hr duty right now) there running 4.2 volts at 12 psi. i'm not running an exhaust right now. phunk and Mitco39 like this.

09-08-2014, 06:50 PM	#6 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	Nice work! How tall are those standoffs? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

09-08-2014, 06:53 PM	#7 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	So if the sidewall slows down the air.....what if you made that sidewall slow it down more. What about roughing it up? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

09-08-2014, 09:04 PM	#10 (permalink)
BBRSpeedWorks Premium Member Join Date: Dec 2013 Location: Ft. Stwart Posts: 366 Drives: 370z,350z,300z,talon Rep Power: 13	well see i got to play with the tune some more...i and stop turning up the boost i started at 7 and started going up...but i hope this sloves the problem Mitco39 likes this.

09-23-2014, 05:27 PM	#11 (permalink)
BBRSpeedWorks Premium Member Join Date: Dec 2013 Location: Ft. Stwart Posts: 366 Drives: 370z,350z,300z,talon Rep Power: 13	here is a pic of the pull from my base tune on 10psi and you can see my MAF's don't get over 4.12 volts.....

09-24-2014, 08:15 AM	#12 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	How tall are those standoffs again? And what were your volts at 10psi before the mod? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

09-24-2014, 11:56 AM	#13 (permalink)
BBRSpeedWorks Premium Member Join Date: Dec 2013 Location: Ft. Stwart Posts: 366 Drives: 370z,350z,300z,talon Rep Power: 13	In tall and idk cuz this was my first configuration..I know one thing that helps is the shright part be4 the maf

10-29-2014, 10:01 AM	#14 (permalink)
COSMO A True Z Fanatic Join Date: Dec 2012 Location: FL Posts: 1,816 Drives: 2012 Touring GTM TT Rep Power: 21	Did some logs yesterday and it seems my stock maf's are almost maxed out right at 17psi with the gtm tt kit. 3" intake tubes. GTM knew that, that's why they went with bigger intakes..

10-29-2014, 10:25 AM	#15 (permalink)
Patrick@AAMComp Base Member Join Date: Sep 2014 Location: Maryland Posts: 160 Drives: with steering wheel Rep Power: 21	If any of you need upgrades, I can get you a good deal on our Z-MAFs. __________________ Luis R. aamcompetition.com

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