Air Flow Meter Bypass article in AutoSpeed
12-20-05, 11:04 AM
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HAILERS
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Air Flow Meter Bypass article in AutoSpeed
Has anybody read the article in AutoSpeed (volume 318-319) and thought about making a Air Flow Meter Bypass? This article: http://www.autospeed.com/cms/A_2424/article.html
It would cost at least three hundred fifty bucks in general. So, if you have no money.....don't read the article.
It would cost at least three hundred fifty bucks in general. So, if you have no money.....don't read the article.
12-20-05, 11:58 AM
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It looks like one of those deals like where you connect a 2nd AFM in parallel with the original, then dial your S-AFC down to adjust for the bypass flow.
Before even thinking if that kind of a jury rig, think stand alone.
Before even thinking if that kind of a jury rig, think stand alone.
12-20-05, 12:12 PM
#7
Originally Posted by classicauto
what kind of perfomance level would you need to be at to be limited by the AFM? 500hp?600hp? on a monster single?
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12-20-05, 12:21 PM
#8
Jesus is the Messiah
Originally Posted by classicauto
hmmm interesting - too bad I can't access the rest of the article....
what kind of perfomance level would you need to be at to be limited by the AFM? 500hp?600hp? on a monster single?
what kind of perfomance level would you need to be at to be limited by the AFM? 500hp?600hp? on a monster single?
The AFM is restrictive starting at about 5000RPM on even an N/A.
Tee a Vac gauge into the MAP sensor line and have a friend watch the gauge when you do a WOT pull. Notice the vac? Now pull the AFM off and put the same filter on, then do the same run.
On my 'vert, It made a two or three inch of Hg difference off my top end, just removing the AFM.
Originally Posted by evileagle
Get a MAPECU for $650 and ditch the AFM altogether 
Last edited by Tofuball; 12-20-05 at 12:24 PM.
12-20-05, 12:35 PM
#10
Originally Posted by Tofuball
Dude, thats way more expensive then even a plug-and-play megasquirt :p
12-20-05, 02:13 PM
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Originally Posted by Tofuball
The AFM is restrictive starting at about 5000RPM on even an N/A.
Tee a Vac gauge into the MAP sensor line and have a friend watch the gauge when you do a WOT pull. Notice the vac? Now pull the AFM off and put the same filter on, then do the same run.
On my 'vert, It made a two or three inch of Hg difference off my top end, just removing the AFM.
Dude, thats way more expensive then even a plug-and-play megasquirt :p
Tee a Vac gauge into the MAP sensor line and have a friend watch the gauge when you do a WOT pull. Notice the vac? Now pull the AFM off and put the same filter on, then do the same run.
On my 'vert, It made a two or three inch of Hg difference off my top end, just removing the AFM.
Dude, thats way more expensive then even a plug-and-play megasquirt :p
12-20-05, 03:08 PM
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Originally Posted by evileagle
True... but some people prefer fuel management solutions that are more... how can I say this.... professional? It doesn't get much easier than 5 wires.
12-20-05, 03:28 PM
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I do have to ask, how did you manage to get a WOT with the AFM unplugged, let alone even start it...
12-20-05, 04:37 PM
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Originally Posted by Parastie
Just because you enjoy paying $1000 for a "professional" install doesn't mean you're getting something better.
12-20-05, 05:06 PM
#18
Originally Posted by Parastie
Just because you enjoy paying $1000 for a "professional" install doesn't mean you're getting something better.
I said nothing about the install, but for my money I'd buy a non homebrew EMS.
Personal preference I guess.
12-21-05, 12:00 AM
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Originally Posted by HAILERS
Has anybody read the article in AutoSpeed (volume 318-319) and thought about making a Air Flow Meter Bypass?
As for the cost, remember that because you need a fuel controller to do this you're also getting all the benefits of being able to retune fuel mixtures. So if you were planning on getting a fuel controller or already have one, all this will cost you is the price of another filter, whatever piping you go with and your time.
Originally Posted by enkin
is autospeed online worth the $15 for all the issues?
Originally Posted by evileagle
I said nothing about the install, but for my money I'd buy a non homebrew EMS.
12-21-05, 12:28 AM
#20
Originally Posted by Tech_Greek
I do have to ask, how did you manage to get a WOT with the AFM unplugged, let alone even start it...
I have a Megasquirt, which may be "homebrew" but show me something better for even twice the price that works even half as good, so I obviously don't have an air flow meter. I have played around and installed an afm back in the system just to draw through to see if it makes a power difference. It absolutely does! Not just a little bit that you might feel. It's quite noticable. SDS efi claims that just by removing the afm on a 2nd gen (assuming you can control it) that you will pick up 10% horsepower. That's not my claim but based on playing around with and without an afm on my car it wouldn't surprise me if this were true.
12-21-05, 01:12 AM
#21
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[QUOTE=NZConvertible]It's a great idea, and I'm surprised it's not done more often. You can get twin-filter kits for the 300ZX which basically do the same thing, measuring airflow to one side of the engine only.
As for the cost, remember that because you need a fuel controller to do this you're also getting all the benefits of being able to retune fuel mixtures. So if you were planning on getting a fuel controller or already have one, all this will cost you is the price of another filter, whatever piping you go with and your time.
Here's a question for the NZ man. I THINK (could be wrong) you have a SAFC. So I was wondering just why you have that instead of the Digital Fuel Adjuster with its 128 load points?
This post was really a bear trap to catch a Kiwi. humor
As for the cost, remember that because you need a fuel controller to do this you're also getting all the benefits of being able to retune fuel mixtures. So if you were planning on getting a fuel controller or already have one, all this will cost you is the price of another filter, whatever piping you go with and your time.
Here's a question for the NZ man. I THINK (could be wrong) you have a SAFC. So I was wondering just why you have that instead of the Digital Fuel Adjuster with its 128 load points?
This post was really a bear trap to catch a Kiwi. humor
12-21-05, 04:24 AM
#24
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Originally Posted by HAILERS
Here's a question for the NZ man. I THINK (could be wrong) you have a SAFC. So I was wondering just why you have that instead of the Digital Fuel Adjuster with its 128 load points?
They also have an really cool EBC, but it won't work on Mazda rotaries because it uses injector duty cycle as the load input to control boost. Again this works well on normal engines but those with staged injection have a huge step in the IDC when the secondaries come on, which would completely mess up the boost control. I was hanging out for this one too so I ended up doubly disappointed.
