Jump to content
SAU Community

Custom Afm

Dj laBBy

By Dj laBBy,
in Fabrication

 Share

Recommended Posts

Dj laBBy Collaborator

Dj laBBy

Posted
Posted

Hey anyone made a custom AFM??

Am thinking of using a Q45 (90mm 3.5") internals and plumbing it into a 4"pipe.

The reason you might say, to slow the air speed through the meter which will give a greater scope. Undoubtly 4" is not much of an increase, but i can also bolt it straight to the 4" turbo inlet and use a 4" filter. I was maxed out at 20psi (260rwkw) so maybe this may help a little.

Plus it is custom and i like tinkering. hehehe

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/
Share on other sites
Dj laBBy Collaborator

Dj laBBy

Posted
  • Author
Posted
your telling me you maxed out a q45 afm at 20psi and only made 260rwkw that doesnt sound right.. more info please

Ah good question.

Had low comp pistons and rb25 head, =extra low comp setup. It was somwhere around the low 7's cr.

When you think about it, 20psi is great for an AFM on rb30 setup, but it was the comp that was killing me, saying that it was an ignition monster, just wanted more and more. Could've thrown 30psi in there and it would've been happy.

However i have high comp standard rb30 pistons in there now so comp is a little more respectful, though would love to make over 300rwkw. So we just see.

Mate its a good experiment just to see how it all goes. plus "Custom" love custom!!!

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-2983997
Share on other sites
djr81 Grand Master

djr81

Posted
Posted
Hey anyone made a custom AFM??

Am thinking of using a Q45 (90mm 3.5") internals and plumbing it into a 4"pipe.

The reason you might say, to slow the air speed through the meter which will give a greater scope. Undoubtly 4" is not much of an increase, but i can also bolt it straight to the 4" turbo inlet and use a 4" filter. I was maxed out at 20psi (260rwkw) so maybe this may help a little.

Plus it is custom and i like tinkering. hehehe

My understanding is that if you change the internal diameter of the pipe in which the air flow meter resides you change the calibration of the meter.

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-2984524
Share on other sites
Craved Grand Master

Craved

Posted
Posted
My understanding is that if you change the internal diameter of the pipe in which the air flow meter resides you change the calibration of the meter.

thats more than likely trua and something that has already been discussed in the Forced induction section.

the modifictaion to the AFM would require you to create a boxed section one the side of the inlet pipe and im assuming that it would require it to be on a straight section too to ensure the flow is even through the meter.

be some fiddly work to get the mounting threads welded on to keep the unit flat inside your box.

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-2984602
Share on other sites
Dj laBBy Collaborator

Dj laBBy

Posted
  • Author
Posted

Yah calibrated, true, but basically whats the difference in calibration when you tune the car for the new calibration?? Yah am running a Power FC, so its all good. The only time you'd be worried about "calibration" so to speak is when you are using the standard comp.

Basically this way you are kinda tricking (real lamens terms) the computer there is less air going through the AFM, the just adjust the mixtures to suit, not rocket science.

Yah tricky making a box?? well really all you need to do is to get a bit of pipe, machine or file a basic flat, make a base plate, weld that on, then by cutting some ally plate say 20mmhigh x what ever the standard width is, then just weld it all up. Screw the AFM unit in and just silicon on a top if you can't be bothered tapping and screwing the top.

Piece of piss(if your a welder/fabricator)

Was thinking of it last night in bed for about an hour. Should hopefully have started it and maybe some pics by monday.

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-2985319
Share on other sites
Craved Grand Master

Craved

Posted
Posted
Yah calibrated, true, but basically whats the difference in calibration when you tune the car for the new calibration?? Yah am running a Power FC, so its all good. The only time you'd be worried about "calibration" so to speak is when you are using the standard comp.

Basically this way you are kinda tricking (real lamens terms) the computer there is less air going through the AFM, the just adjust the mixtures to suit, not rocket science.

Yah tricky making a box?? well really all you need to do is to get a bit of pipe, machine or file a basic flat, make a base plate, weld that on, then by cutting some ally plate say 20mmhigh x what ever the standard width is, then just weld it all up. Screw the AFM unit in and just silicon on a top if you can't be bothered tapping and screwing the top.

Piece of piss(if your a welder/fabricator)

Was thinking of it last night in bed for about an hour. Should hopefully have started it and maybe some pics by monday.

only reason if that would be tricky is if the underside of the circuit board isnt flat

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-2985336
Share on other sites
  • 2 months later...
Medium Dave Proficient

Medium Dave

Posted
Posted
Yah calibrated, true, but basically whats the difference in calibration when you tune the car for the new calibration?? Yah am running a Power FC, so its all good. The only time you'd be worried about "calibration" so to speak is when you are using the standard comp.

Basically this way you are kinda tricking (real lamens terms) the computer there is less air going through the AFM, the just adjust the mixtures to suit, not rocket science.

Yah tricky making a box?? well really all you need to do is to get a bit of pipe, machine or file a basic flat, make a base plate, weld that on, then by cutting some ally plate say 20mmhigh x what ever the standard width is, then just weld it all up. Screw the AFM unit in and just silicon on a top if you can't be bothered tapping and screwing the top.

Piece of piss(if your a welder/fabricator)

Was thinking of it last night in bed for about an hour. Should hopefully have started it and maybe some pics by monday.

Might be a bit of science in it, the afm reads the airflow and outputs in a logarithmic curve, then the computer outputs that in a linear curve using a conversion table, by increasing the diameter you may throw the curve well out of whack. How's it all going anyway? im curious to know

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-3135213
Share on other sites
  • 3 weeks later...
  • 3 weeks later...
Craved Grand Master

Craved

Posted
Posted

Hi, I don't know much about air flow meters but i need one for my 95 series 2 gtst skyline.

Can anyone advise me on what one to get and where to get it from?

Cheers.

You will get a better response in the Forced Induction section.

stick with STD or if you have a Power FC and are chasing power try a Z32..

Search in FI if you are unsure about this

Link to comment
https://www.sau.com.au/forums/topic/160559-custom-afm/#findComment-3203032
Share on other sites
  • 1 month later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Ben_D
      Wanted to buy R200 longnose LSD 3.9 ratio

      By Ben_D · Posted

      Hi all,  I am in the market for an R200 longnose diff out of a Z31 300ZX, or S12 RSX, DR30 skyline, or similar, in a 3.9 ratio.  Preferably a late model one with the M12 crownwheel bolts.  The only easy to find advert for one of these was my ad back in 2007 when I sold it on this forum.  I sold the diff as I had sold the car it goes to, but as it turns out, after 18 years I got the car back late last year, so now I'm looking for the diff !  If anyone knows where to find a longnose R200 LSD with the M12 crownwheel bolts, drop me a line at [email protected] - Bonus paid if soomeone comes up with the original diff (stranger things have happened !).  Cheers   Ben D    
    • Ben_D
      Back for more after 18 years - and where are the longnose R200 LSDs?

      By Ben_D · Posted

      Hi everyone, I used to post here a bit from 2004-2013, when I owned various Nissans, in particular my S12 RSX gazelle, which was sold in 2007.  As luck would have it, after an 18 year hiatus, the car found its way back to me last year, and over the past 11 months I have had the pleasure of restoring it with my kids.  One thing that I am after in particular is a 3.9 ratio R200 LSD for it.  I actually sold the one out of the car here back in 2007 , and it would be incredible if I could track down who I sold it to, so I can see how they have progressed over the years (and to be honest, to see whether I can get the diff back !).  Anyways, hi all and let me know "where are the R200 Longnose diffs all at these days ?  Cheers Ben D  
    • sonicii
      G35 Control arm and Compression Rods into a V35 Skyline.

      By sonicii · Posted

      Arms will be the same as the G35 or 350Z, but as above, there was a change in the lower control arm where it connects to the ball joint.  That said, you can remove the ball joint cone from your old ball joints and fit them to the new ball joints.  To be honest, I didn't think the ball joints themselves were different. The main ball joint is a bit awkward to replace, you really need to remove the steering knuckle to press out the old one.  Some people have used tools to remove it in place, but it just seemed too hard to get to. If you are going to press out/in that ball joint, then you may as well just replace the bushings in the LCA and the compression rod.  You can buy the compression rod bushing from Nissan, but the LCA bushes, you will need to go aftermarket. Much cheaper than buying the whole arm.
    • Erelyes
      Ceramic turbine damage to engine - what did yours do?

      By Erelyes · Posted

      Ha, well, it's been.... a bit of a journey. Things have taken much longer than I'd hoped. I'll probably put up a thread at some stage. Hopefully soon. The car's not done any kms since my update in June though, put it that way.
    • Dose Pipe Sutututu
      M35 Aftermarket Fuel Pump

      By Dose Pipe Sutututu · Posted

      Here's the chart for fuel pressure vs. current draw, assuming your base fuel pressure is 3 bar and you run like 0.5bar boost on WOT, you should only momentarily hit 9amps here and there. (Ignore my prev post, I cannot read a chart these days it seems)
×
×
  • Create New...