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MAF output maxxed out with FI

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Old Jan 1, 2004 | 12:01 PM
  #1  
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Default MAF output maxxed out with FI

Deleted - I simply posted info I had previously said I would...take it any way you like but it was not implying that nobody can run FI on a z

Last edited by GaryK; Jan 1, 2004 at 08:25 PM.
Old Jan 1, 2004 | 12:05 PM
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moved
Old Jan 1, 2004 | 04:09 PM
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I'll be the villiage idiot... So, what exactly *are* the implications?

--Steve
Old Jan 1, 2004 | 04:28 PM
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Originally posted by zimbo
I'll be the villiage idiot... So, what exactly *are* the implications?

--Steve
The implications are that GaryK can never run FI on his car
Old Jan 1, 2004 | 04:51 PM
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Well he may have the wrong wire because he implies (and this is not an attack and it is not open for discussion) that NO ONE can run FI if this is indeed the case.

Again "he is not here" and it is not open for discusion isn't the best way to tell the world that no one can run FI because of the MAF.

If it was open for discussion I guess I would ask what he was logging with?

The implications would be we would all have to remove our FI's including Turbo's.
Old Jan 1, 2004 | 07:14 PM
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If it were open for discussion, this is what i'd say:

If the MAF were maxxed out we would be getting CELs or failsafe modes kicking in.......however, there are simple mods that can improve the sensitivity range of the MAF............one of them is to increase the size of the intake tube where the MAF sits......this will decrease the density of the air thats hitting the MAF.......another mod is to place an obstruction in front of the MAF to deflect some of the air.....both of these have been used with success on other cars (some nissans even)
Old Jan 1, 2004 | 07:19 PM
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well can't we open it for disussion like adults geez.

The Ultimate Z Care (I think that was the one) was not even close to max at 6600 rpm's and it was logged.

So if it were open for discussion I would ask Gary if he has ever hit 5300 rpm's prior to this find and if he did did it ever go into fail safe mode (built in by Nissan for this scenario.) If he hasn't ever hit 5300 rpm's after all this time why?

2. Is he going to remove the Procharger or what is his solution aside from PMing us all?
Old Jan 1, 2004 | 07:29 PM
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if we were dicussing this there would be an easy fix for this ( even though I doubt we have maxed out maf because all FI cars would see a CEL like everyone has said so far) we could all make greddy rich and buy there e manage, hook up the additional map sensor. Then the maf would read during normal operation and the map could take over anytime boost is present. problem fix see So Iguess I will still be installing my greddy kit when it shows up.
Old Jan 1, 2004 | 07:52 PM
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Originally posted by 12SecZ
well can't we open it for disussion like adults geez.

The Ultimate Z Care (I think that was the one) was not even close to max at 6600 rpm's and it was logged.

So if it were open for discussion I would ask Gary if he has ever hit 5300 rpm's prior to this find and if he did did it ever go into fail safe mode (built in by Nissan for this scenario.) If he hasn't ever hit 5300 rpm's after all this time why?

2. Is he going to remove the Procharger or what is his solution aside from PMing us all?
I attached a screen shot of the MAF input log/RPM from the E-Manage on my Z. It does show the airflow being maxed at 4937 on mine. Unless the MAF output voltage actually goes above 5.00v and the E-Manage somehow inhibits this I believe he might be right. I just assumed that the increasing fuel pressure from the DFMU was the only reason the car runs properly past this RPM. Should it not run right? I really dont know what else this implies? If this is correct the 350Z does not have any safeguards in place for bizare occurances in the MAF reading. Thank god. The Z is a big enough pain in the *** to tune as it is. I have many logged runs that show this very same issue. Car runs great, needs a little more fuel around redline still. Aint it interesting that my car maxes out at 300+ RPM lower than Gary's? Could also indicate part of the complex "why Swinke's Z needs more fuel than everybody elses to run happy" question. HMMM?
Attached Thumbnails MAF output maxxed out with FI-project1.jpg  
Old Jan 1, 2004 | 09:00 PM
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if we were discussing this, i would say this next:

wow.....maxxed out with no reaction from the ECM???......at least something went right on this ECM.......since there's no reaction, is there any mod even necessary then?......are you thinking about trying out the MAP add-on swinke?
Old Jan 1, 2004 | 09:03 PM
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Well geez man,

It **seems** like we are discussing it but yet we are not? I am at a momentary lape of reason.

I mash my peddle the Boost Guage goes up the EGT stays within limits and as recent as yesterday a Supercharged GT Stang got my license plate from 4 car lenghts from a dead stop. He politely flipped me off as if to say Happy New Year. That is all I know.

Domestics MAF's have screens, ours is a straight through!

My PM box awaits notification of an invitation to a discussion starting. This is sort of like I have a secret but I am not sharing it.

Meanwhile all of our FI engines are at risk of exloding like C4 eh?And here we dedicate a forum strictly for FI so we can not discuss stuff. I think we should all park our cars until this is resolved, why aren't the reflashed cars mashing the boost exploding? My race yesterday was about 40 degrees and dense!

I am not hacking a wiring harness for GReddy for this kit, it is getting ridicoulous. Complete Kit plug and play remember? Knock detector and retard timing and it's fixed, now this?
Old Jan 1, 2004 | 09:06 PM
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I don't know why Gary even bothers. You guys asked him to log the MAF voltages, he did. If you think you're not gonna like the results don't ask for the information.

I wish I would've read the original post, but if the MAF is maxxed out below redline, then my much maligned ECU thread is not theory anymore. I guess the question now is, can you max out the MAF before you go into open loop mode. If so then you guys who are relying on a reflashed ECU and stock MAF to regulate fuel, really ought to think about modifying the MAF to properly meter the incoming air. Just a suggestion, take it however you like.
Old Jan 1, 2004 | 09:07 PM
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Edit add, just noticed the original post was deleted. Discussion over.

Everyone run BOOST at risk all FI Vendors take note, we are parking OUR CARS and CEASING BUYING FI until someone gives us a straight ANSWER! But we can't discuss it 10 engines later because of stubborn pride?

What is the friggen fix? Engines are at risk. Mine works, is it a ticking time bomb too? Pulling my plugs Saturday!!!!
Old Jan 1, 2004 | 09:09 PM
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Jesse,

You are a big whining Baby and I am through talking with you. GROW UP! No one PM me any further including Jesse and Gary figure it out yourself!!!!!!!!!!!!!

You both said you were angry and leaving, then drop this crap then vent and run.

That is not help, it's childish. How many theories of yours are you going to recant?

P.S. That signature has got to go, it's irratating!

Last edited by 12SecZ; Jan 1, 2004 at 09:13 PM.
Old Jan 1, 2004 | 09:13 PM
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Originally posted by jesseenglish
I don't know why Gary even bothers. You guys asked him to log the MAF voltages, he did. If you think you're not gonna like the results don't ask for the information.

I wish I would've read the original post, but if the MAF is maxxed out below redline, then my much maligned ECU thread is not theory anymore. I guess the question now is, can you max out the MAF before you go into open loop mode. If so then you guys who are relying on a reflashed ECU and stock MAF to regulate fuel, really ought to think about modifying the MAF to properly meter the incoming air. Just a suggestion, take it however you like.
well i guess we all need to modify our MAFs now right?......not just the TS reflash people, but ALL FI Z's.......we all have MAFs, and they're all maxxed out.....we're doomed.....i'm parking my car
Old Jan 1, 2004 | 09:18 PM
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me too, seriuosly, I am driving my SUV until this is resolved, I am tired of games.

Sorry for the rant, stop PMing me. I was told to stay out of your ECU thread AND I DID!
Old Jan 1, 2004 | 09:22 PM
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Max, your sarcastic responses are exactly the reason I'm through with this. I posted what I found, even though I've already said I was done here. The reason I did that was to come through with something I had already said I'd do. As usual, the answer wasn't what you wanted to hear, so you responed with pure ******** as usual.

You guys immediately started with the smartass replies and you are completely missing the whole point of looking into the scenario in question. If anybody has a problem because of the maf, its you since you are relying only on the ecu for fuel and timing control. My fuel and timing are being controlled based on boost, and it works great that way. That is not to say that you will have a problem though, so don't get your panties in a bunch. I'm not sure that you're capable of understanding the implications I alluded to in the original post, but I'd have faith that even you would indeed understand if you'd take a pause from your senseless posts and listen for a change.

Does the maf really max out? Based on what I logged it did. You don't have to believe that....nobody does. As far as what the ecu does, I have yet to find any documentation of what the exact requirements are for triggering an maf out of range fault. The manual does show that it can trip these faults, but it does not give detailed criteria for triggering them.

Mods...please lock this, as its obviously a mistake to post this info here.
Old Jan 1, 2004 | 09:23 PM
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in before da lock
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