Bosch MAFs
08-18-2005, 09:32 PM
#1
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Bosch MAFs
It seems like our Altima brethren are employing bosch MAFs now? what's the truth to this? i hate discussing on those boards as i never get the answer i want. my am600 died today and i'm still debating whether or not to get another one, an 00-01 MAF and mod it, or some sort of alternative... And will someone please chime in if they know if the 04 alti MAFs fit on our cars? I heard those don't break...
08-18-2005, 09:43 PM
#3
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well, my first one has gone bad today after i was in denial that MAF would never break lol, and who knows when the replacement will go bad. i'm just looking for a dependable alternative.
08-18-2005, 11:30 PM
#4
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I once looked into this. I think Studman found a bosch replacement that electrically matched the 2K-2K1 or 2k2-2K3 MAF. Don't remember which.
The unit I came across was the Bosch_HFM5. One of the things wrong with this unit was the output voltage (5v) at WOT. Where as the 2K-2K1 MAF output approx 4v and WOT.
I heard there was a HFM4 but couldnt find a datasheet on it.
Hope that helps
The unit I came across was the Bosch_HFM5. One of the things wrong with this unit was the output voltage (5v) at WOT. Where as the 2K-2K1 MAF output approx 4v and WOT.
I heard there was a HFM4 but couldnt find a datasheet on it.
Hope that helps
08-20-2005, 07:39 AM
#5
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Bosch hot film massair sensors require perfect depth installation to work properly. we had some cases of people putting intake 'sound pipes' on boxsters and the mounting flange wasnt machined to the correct height.
put the same HFM in a stock boxster and it works fine...
put the same HFM in a stock boxster and it works fine...
08-20-2005, 08:45 AM
#6
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hm...i dunno i thought alti's were already using bosch maf's...and as far as i can tell, all the new alti's except the 05+ can use the same maf's as us (dealers are now replacing their broken maf's with am600s...)
08-20-2005, 02:53 PM
#11
Originally Posted by GBAUER
just to let you know: you don't have to replace the entire maf at $450, you can just replace the guts for about $125. Ask your local stealership.
08-20-2005, 04:19 PM
#13
Originally Posted by n3985
Please elaborate on this, thanks.
08-20-2005, 05:59 PM
#15
Originally Posted by n3985
Are there DIYs anywhere on this? 
I was pretty surprised and relieved when i heard about this...
08-21-2005, 07:11 AM
#19
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Originally Posted by joebangaa
why would you fear going WOT. now that fiddled with the intake, i've been going WOT constantly to verify my MAF woes are all gone. and they are!
08-21-2005, 08:08 AM
#21
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Originally Posted by sascuderi
Because, when you go WOT you are sending more voltage to the MAF wire, which, in my opinion, over time "weakens" the poorly designed MAF. Yes the oil etc on the wire can lead to failure, but many have lost their MAF with no modification of the intake. If you notice, most people have a sudden loss of their MAF when they are quickly accelerating.
actually a couple days ago i thought mine was going when i punched it, turned out vibration issues were causing my MAF to act funny...reused the stock flex section from the stock airbox to connect the intake piping to the throttle body, all woes are gone! shogun, if you never did this, you should...probably wouldn't have blown ANY of your MAFs
08-21-2005, 08:55 AM
#22
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Originally Posted by joebangaa
actually a couple days ago i thought mine was going when i punched it, turned out vibration issues were causing my MAF to act funny...reused the stock flex section from the stock airbox to connect the intake piping to the throttle body, all woes are gone! shogun, if you never did this, you should...probably wouldn't have blown ANY of your MAFs
After the Berk, the engine doesn't move at all, so I would assume more vibration is sent down the intake? (I have the Berk intake secured on the end and it seems to prevent movement of the engine. But the forces that were causing the movement must still exist and maybe cause the MAF wire to vibrate?)
Therefore do most of you think it is best to keep using the original flex tube connected to the throttle body when installing an aftermarket intake?
08-21-2005, 09:05 AM
#23
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YES. you want the engine to move freely. also, if anyone has a PR/cattman CAI, you'll notice upon initial installation with all parts in the kit, you get a squeak sound whenever you start from a stop. this, and MAF vibrations, are all alleviated by the flex section.
08-21-2005, 09:27 AM
#24
Concerning vibration issues, I managed to reduce some of the vibration from the chassis by using rubber washers on the bracket to the mid-pipe/filter; on both the chassis end and on the filter end. I didn't do anything about vibration from the engine by using the stock accordion piece in place of the silicon from Berk, but I'm still using the original MAF my car came with so that doesn't seem to be an issue for me yet.
08-21-2005, 10:33 AM
#25
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well, you have a berk right? with the cold airs going through the fender, i think the whole engine movement isn't good since the hole in the fender doesnt allow much free-play room. replacing the silicon from cattman made a world of difference for me
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