AFM mounted after turbo?

demetk · Post by **demetk** » Sep 10, 2010 12:21 AM

Can the AFM be mounted after the turbo? Haven't been able to search this question.

TIA

George · Post by **George** » Sep 10, 2010 12:53 AM

Yes, but they don't seem to hold up to well when under positive pressure.

Jsanders · Post by **Jsanders** » Sep 10, 2010 2:30 AM

So what does hold up well under positive pressure?

George · Post by **George** » Sep 10, 2010 7:24 AM

A map sensor.

demetk · Post by **demetk** » Sep 10, 2010 8:53 AM

Thank you. Are we talking large pressures? I will be running about 6 psi. It would be nice to run a good air box instead of the crappy K&N.

T_C_D · Post by **T_C_D** » Sep 10, 2010 9:05 AM

Are you removing the MegaSquirt?

Shadow · Post by **Shadow** » Sep 10, 2010 2:40 PM

After you adjusted the wheel you'll need to glue the lid back or it'll leak like crazy.

demetk · Post by **demetk** » Sep 10, 2010 3:33 PM

T_C_D wrote:Are you removing the MegaSquirt?

The car was a mess when I got it. Let's see, burnt clutch, cracked head, nightmare MS wiring. So I gutted everything in there including the engine and MS.

The car is now running beautifully with the 179 ecu. I'm planning on installing an FMU and keeping it at 6 psi.

turbodan · Post by **turbodan** » Sep 11, 2010 12:22 PM

I had no problems with a pressurized AFM. I never bothered to glue the lid back either. Never had any problems. It would be just fine for a low boost system.

demetk · Post by **demetk** » Sep 22, 2010 5:05 PM

Thanks for the replies. They were very helpful. I finished the mock-up, but without the intercooler at least for now.

Before with the K&N:

After with a 745 air box:

Patrick McHugh · Post by **Patrick McHugh** » Sep 24, 2010 10:49 PM

What are the advantages to mounting the AFM after the turbo?

turbodan · Post by **turbodan** » Sep 25, 2010 11:29 AM

Patrick McHugh wrote:What are the advantages to mounting the AFM after the turbo?

Its reads IAT and cuts a great deal of plumbing out of the metered air system which eliminates the effects of slight leaks and allows you to run a simple blow off valve without dumping metered air.

demetk · Post by **demetk** » Sep 25, 2010 10:10 PM

turbodan wrote:
Patrick McHugh wrote:What are the advantages to mounting the AFM after the turbo?
Its reads IAT and cuts a great deal of plumbing out of the metered air system which eliminates the effects of slight leaks and allows you to run a simple blow off valve without dumping metered air.

Just so I understand this.

What's an IAT?

So the blow off valve in my new case doesn't need routing back into the intake because it will be before the afm? A simple blow off valve will be one that vents to atmo? I need to go check the one I have now.

Thanks

George · Post by **George** » Sep 25, 2010 10:12 PM

Intake air temperature. Basically the temp of the charge air.

demetk · Post by **demetk** » Sep 25, 2010 10:14 PM

George wrote:Intake air temperature. Basically the temp of the charge air.

Great, thanks George.

Shadow · Post by **Shadow** » Sep 26, 2010 3:55 AM

also that door might be a restriction if you have a 4''
inlet. Probably not though since it's low boost only. But also
something to think about.

turbodan · Post by **turbodan** » Sep 26, 2010 11:16 AM

As long as the door is of a larger diameter than the compressor outlet it wont be a problem. For reference, the outlet of my GT3582R is about the same size as an M20 AFM.

MyE28.com

MyE28.com

AFM mounted after turbo?

AFM mounted after turbo?