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.

 

don't forget the $5 just to read the full article

 

well, it is an intriguing idea, but i didnt want to spend the $4 to read the rest of the article.
is autospeed online worth the $15 for all the issues?

 

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?

 

Get a MAPECU for $650 and ditch the AFM altogether

 

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.

 

I thought I remember reading that somebody had maxed out their s4 AFM in the low 300whp range. Based on the voltage reading it was all the way open.

 

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

 

is megasquirt a stand alone or is it a piggy back system?

 

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.

 

i wouldnt even THINK of pushing 5 or 600 HP with out a standalone of some sort

and yes, a Megasquirt N' Spark is a complete DIY EMS

 

there is also the options of getting a VPC all the supra guys do it

 

I do have to ask, how did you manage to get a WOT with the AFM unplugged, let alone even start it...

 

Just because you enjoy paying $1000 for a "professional" install doesn't mean you're getting something better.

 

I am sure he already had MS running his car ... and using the AFM as a "restrictor" ...

 

Install an AP engineering PFC on your s5 and convert to FD map sensor (speed density)

 

Just because you enjoy paying $350 for a 'college student's spare time' 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.

 

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.

Absolutely. It would take you months to get through the 2700+ articles you'd get. It is by far one of the most informative automotive websites around and there's nothing else available in print or online that has this much info for so little money. If you're looking for info on how to bolt the latest mega-dollar, brandname BOV or cat-back on your car this isn't for you, but if you want to genuinely learn about all aspects of all types of cars you won't be disappointed. I've been a member since not long after it started ('98) and still look forward to my daily fix.

The MAPECU is not an EMS...

 

I was wondering the same thing.

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.

 

[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

 

Pardon me, FMS. I understand the difference

 

That would make sense!

 

Nope, I don't have an S-AFC (I wouldn't mind one though). I was really excited about the DFA when Autospeed started talking about it about a year before it's release, but was disappointed to discover it won't work on FC's with mismatched primary and secondary injectors. Unlike the S-AFC it only uses load as the input, not rpm and load. It's basically a one-dimensional inteceptor. This works really well until you upgrade the secondary injectors and need to make different adjustments for different revs (i.e above and below 3800rpm). It would work great with stock injectors or four upgraded injectors of the same size, but not for the good ol' 720cc/min secondary upgrade I might eventually do one day. I still might get it though; fuel control is always a good thing and the kit's way cheaper than any other fuel controller.

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.

 

You win!