Relocating the MAF

[S2_Dave]

You do. some times however, particularly with a BB turbo, you need to slow down the air flow (it will need mapping to suit) mine occasionally hits the boost limit and its basically down to air speed through the MAF as the boost limit thresholds are lifted beyond what it kicks in at.

Did you need to do this with your car? Mark mapped it didn't he?

[DJones]

I've not done it yet but i need to. Yes Mark mapped it.

[S2central.net]

Larger diameter at the MAF housing will indeed slow down speed of air over the hot-wire, but it also screws up the scaling of air-mass to voltage characteristic of the device... You could use an expensive SQ MAF with its bigger tube (and known scaling) or get the RS2 MAF calibrated on a flowbench with the bigger housing... Then use that data to remap the loading points on the ECU - complex stuff this. No wonder the after-market boys ignore MAF and go straight for MAP and throttle position.

Paul

[S2_Dave]

Don't you still get scaling issues with the SQ MAF, as at 5V there'll still be more air-mass than the ECU expects at 5V?

[S2central.net]

yeah - which is why only the most experienced Motronic meisters can remap the ECU accordingly when the MAF is rescaled !

Paul

[Rusty]

There you go Russ, ditch the Moronic and go aftermarket... all so you can ditch the MAF

[andyg plym]

Here's some shots of my old setup and my new one.

Old setup with RS2 airbox and stock inlet.


Zoom in to the bung for the aux rad hose and you can see it just to the right.


Close up.

wot size are these hoses as i am doin same mod