Intercooler Piping Accessorie Locations

[5ky-lin3]

Hey guys,

I'm about to get some intercooler piping made up for my r33 rb25det and just want to confirm some things.

Because I have fitted a forward facing plenum and new turbo I'm planning on shifting the afm to the piping ( throttle body side) and will also have on that same piping from the intercooler to the throttle body the BOV, spot for water meth injection and a spot for the ACC valve from the plenum. Things will be tight so not sure as yet if the AFM will definitely be relocated but that's the plan. However I need to confirm what order these 4 things go in and the spacing. At the moment I think it would go in this order (being closest to throttle body first and close the intercooler last): water meth (80mm from TB), ACC (100mm from TB), BOV (200-300mm from TB), AFM (close to intercooler as possible).

If this is not correct please let me know. Any help is much appreciated.

Cheers

[GTSBoy]

That would not be correct. You would want the AFM to be downstream of the BOV. Otherwise, with the arrangement you've listed, your AFM will register the flow of air through the BOV as the turbo-intercooler volume vents through the AFM towards the BOV (and then probably measure it again as it goes around again, and maybe again!).

I hope you've got a programmable ECU or it's going to be a world of pain with the AFM in the pipework otherwise.

[5ky-lin3]

That makes sense that the AFM should be on the throttle body side of the BOV adaptor..

Yeah I have a PFC. Doesn't make a difference if the BOV was plumb back or athmospheric does it?

[GTSBoy]

With the above arrangement you could vent it to atmosphere, but you'd catch AIDS.

[5ky-lin3]

So the original way is correct if its to atmo? Being BOV throttle body side of AFM?

Air that is lost to atmo that has been measured by the afm already can be tuned to compensate?

[GTSBoy]

No, when I said "the above arrangement", I meant the arrangement immediately above, not the arrangement most above. That's a standard form for referencing such things.

To specifically answer your question, you do not want to vent any air, ever, that has passed through the AFM to any other position than downstream of the AFM. To phrase that another way, if the BOV is downstream the AFM, then the return must also be downstream the AFM. If you vent it out to atmosphere after the AFM, the ECU sees it as air that needs fuel and you get rich shenanigans.

[ARTZ]

intercooler > afm > bov (vent to atmo or turbo intake) > WMI > throttle body

I dont think it will matter so much with the afm that close to the throttle body cause it will re-read any incoming air...there is not enough caught up in intake piping between AFM and TB to make a difference..its probably easier to just have an atmo bov...

not sure i liek the idea of the WMI and AFM being so close together though...any reason you cant leave the AFM in fornt of the turbo?

[GTSBoy]

Sorry ARTZ. You just said the exact opposite of what I said, and I reckon I'm right.

[Piggaz]

What do you hope to achieve by moving the AFM?

[KiwiRS4T]

Put the bov just past the turbo and vent it into the turbo intake.

[5ky-lin3]

Just want the Afm in the piping so I don't have to put a restrictor on the turbo intake. Even though it would effect it bugger all I think it'd look a little clear being the same size all the way to the filter.

Would it be easiest to just have the AFM throttle body side of cooler and have BOV turbo side and vent it back to intake piping?

[5ky-lin3]

Has anyone placed the BOV turbo side? I figure it would be ok if it was venting atmo cause it would be disposing hot air and if it were plumb back would be better on the cold side to recirculate the cold air back

[ARTZ]

Sorry ARTZ. You just said the exact opposite of what I said, and I reckon I'm right.