(4th Gen) - Z32 MAF on charged side, 370cc, JWT ECU & S/C - how to make it work
11-10-2005, 06:53 PM
#1
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(4th Gen) - Z32 MAF on charged side, 370cc, JWT ECU & S/C - how to make it work
So I've been asked to do a writeup on how to make the Z32 MAF setup work with the JWT ECU + 370cc Injectors while S/C'ed on the charged side.
Symptoms:
With the Z32 MAF on the charged side and stock Stillen piping the car idles horribly, bucks hard when cold, and is generally undrivable.
Solution:
The Stock Stillen piping doesn't work well with this setup. After spending a year trying to figure out if it was compressor surge, vacuum leak, etc, etc it turned out the reason (And solution) is quite simple.
I needed 3" Piping.
The reason is not compressor surge or any performance boost with 3" piping. The reason is simply that with the flange on the stock Stillen piping facing the way it faces, it causes the MAF harness to face up or down.
It must face towards the battery - like this:
As soon as I had the 3" piping in originally (With the harness facing up) - it still idled and ran horribly especially when cold.
Turned the MAf 90 degrees - and problem solved.
Car idles a little wonky for 90 seconds on cold days - and has some dead spots at low RPM when cold - but it is drivable. As soon as it warms up even a little - it idles BETTER than it did with the A32 MAF and runs perfectly.
Sticky this bish!
Symptoms:
With the Z32 MAF on the charged side and stock Stillen piping the car idles horribly, bucks hard when cold, and is generally undrivable.
Solution:
The Stock Stillen piping doesn't work well with this setup. After spending a year trying to figure out if it was compressor surge, vacuum leak, etc, etc it turned out the reason (And solution) is quite simple.
I needed 3" Piping.
The reason is not compressor surge or any performance boost with 3" piping. The reason is simply that with the flange on the stock Stillen piping facing the way it faces, it causes the MAF harness to face up or down.
It must face towards the battery - like this:
As soon as I had the 3" piping in originally (With the harness facing up) - it still idled and ran horribly especially when cold.
Turned the MAf 90 degrees - and problem solved.
Car idles a little wonky for 90 seconds on cold days - and has some dead spots at low RPM when cold - but it is drivable. As soon as it warms up even a little - it idles BETTER than it did with the A32 MAF and runs perfectly.
Sticky this bish!
car idles fine. But in any case cant wait to go to 3 inch piping.
03-17-2006, 06:06 PM
#5
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You got lucky I guess.
Matty and I had the same problem with the same fix. Even now if I twist the MAF 90 degrees it still does it.
Then again, mine was facing up, not down....
Matty and I had the same problem with the same fix. Even now if I twist the MAF 90 degrees it still does it.
Then again, mine was facing up, not down....
03-28-2010, 08:53 PM
#6
certain this isnt a defetive MAF? I would think its a bit strange that the MAF would react in sucha manner due to orientation of the unit... Hmm.. interesting.. I have to keep this in mind when i get the MAF.
P.S. is the ~.04v wire the black or the brown.. or both?
P.S. is the ~.04v wire the black or the brown.. or both?
05-11-2010, 10:12 PM
#7
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Posts: 149
I found the pic on the right from an older post (thanks Flav)..... since im doing a 300zx swap... i thought i should sure....
05-12-2010, 08:24 AM
#8
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Yes - I did the same thing on 2 MAFs from a buddy's 300z - which ran great.
All of the MAFs had to have this rotation to work.
It appears to not be the same for others - and I did have custom 3" piping - so maybe it was an airflow turbulence issue...?
All of the MAFs had to have this rotation to work.
It appears to not be the same for others - and I did have custom 3" piping - so maybe it was an airflow turbulence issue...?
05-28-2010, 07:32 PM
#10
Thanks for the pics chief. appreciate it. This was one of mysimple searches on the org... otherwise i would be trying to go through posts form like 2006...
10-21-2010, 05:48 PM
#13
ok heres my problem i have 2k max sced with jwt ecu 550cc and 300z maf and i cant get 5v to the maf keep shuting off,idle is crazy and wont go pass 2500 i know the first thing u guys are going to say is change the maf i did twice now what?
10-21-2010, 06:53 PM
#14
Sounds like if you changed the MAF twice that you may have it wired incorrectly? Has it worked before? What you described is a BAD MAF like the car is running in safe mode.
10-21-2010, 07:13 PM
#15
Yea I got the wiring digram for the z. on the 2k max it has 4 wires white,red,black,red&green. Red is not used only w/b/r&g . I think I might have to run a wire from the ecu pin 42 I think right to the maf I hope not that is so annoying I just made a wiring harness to fit the 2k max and I don't think I'll do it ever LOL .no this is my first time trying it that's y I'm lost
Last edited by hove75; 10-21-2010 at 07:16 PM.
10-22-2010, 05:50 AM
#16
Yea I got the wiring digram for the z. on the 2k max it has 4 wires white,red,black,red&green. Red is not used only w/b/r&g . I think I might have to run a wire from the ecu pin 42 I think right to the maf I hope not that is so annoying I just made a wiring harness to fit the 2k max and I don't think I'll do it ever LOL .no this is my first time trying it that's y I'm lost
5th gens have the advantage of being able to unbolt the maf sensor from the actual housing and into a bigger housing. Search "land rover MAF housing"
If your maf is on the charged side, i highly recomend this. If it is on the uncharged side like the original 5th gen SC kit, it is not really needed.
10-22-2010, 06:08 PM
#17
The reason you are lost is because you are trying to use a Z32 maf in a 5th gen. Read the title of the thread, this is for 4th gens. I dont know anyone that has ever used the Z32 maf in a 5th gen, but this is because we dont need to.
5th gens have the advantage of being able to unbolt the maf sensor from the actual housing and into a bigger housing. Search "land rover MAF housing"
If your maf is on the charged side, i highly recomend this. If it is on the uncharged side like the original 5th gen SC kit, it is not really needed.
5th gens have the advantage of being able to unbolt the maf sensor from the actual housing and into a bigger housing. Search "land rover MAF housing"
If your maf is on the charged side, i highly recomend this. If it is on the uncharged side like the original 5th gen SC kit, it is not really needed.
Last edited by hove75; 10-22-2010 at 06:11 PM.
12-02-2010, 09:30 PM
#21
12-04-2010, 01:31 PM
#22
The emanage and safc/vafc intercept the maf wire so any of these are basically a maf hack, they manipulate the maf signal going to the ecu. Any of these can be used. You should have a wideband to see what the adjustments you make do.
12-04-2010, 05:25 PM
#23
Z32 MAF
Thanks, does it matter what year 300Z I get Z32 for? Im guessing I need the MAF from a turbo charged 300Z ?
12-07-2010, 10:31 PM
#24
12-08-2010, 03:43 AM
#25
Yeah, I did a little more research and found out that the J30 uses the exact same maf. I found one for a 93 J30 for 75 bucks with the harness from a local junkyard. I have been searching online and on ebay.. I have seen the maf for 100 and up. Seems like my local price beats them all so far.
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