AFP (MK4 VR6) intake manifold swap/info/pics/DIY/ect?

[steveo27]

I am looking for more information on the MK4 AFP VR6 intake manifold swap on a MK3 AAA motor using MK3 wiring/ECU. I've been searching around for a while, and havent come across too much beside a bunch of bickering about how its a waste of time and money & ive only found a few decent pics of it....





From the looks of it, an OBD2 throttle body fits (upside down) if you run a cable guide.

as for the "shifter" in the manifold, it appears to be vacuum controlled via the same line as the FPR and it operates the same way as a Schrick VGI manifold.

Schrick -



vs.

AFP -




#6 - flap acutator
#27 - solenoid
#23 - vacuum reservoir

and use an RPM switch as the control device to control the solenoid.

Something like this -



http://www.summitracing.com/parts/SUM-830449-1/?rtype=1
I was wondering if anybody in MK3 land has done this beside the one car I've seen?

[Scotty_2.0]

In for answers although I have no real interest in swapping myself

[APCXxstovetopxX]

reason to swapping to a mk4 mani? i would think for the cost/effort it would be easier to go SRI or 2.9 clone

[steveo27]

Cheaper to do the AFP manifold.

TTT

[vr-vagman]

Hi,
AFP manifold has equal runner lenghts. This is because VR runner lenght compensation is build/made in the camshafts design, i.e rear and front cams have different (actually opposite symetrical ) phases and valve strokes. AAA engine cams have similar cam profiles but different inlet runner lenghts(compensated). So, the conclusion is AFP manifold should go with AFP cams.
Just FYI

[steveo27]

I understand that. I plan on swapping in a complete AFP motor into my car to replace the current AAA motor with 2 spun rod bearings.

I have the opportunity to purchase a complete motor for next to nothing.

[Grabbit]

Bump for steveo, I'm looking to do this, It seems like a complete manifold swap, cams and even a head gasket/ valve job would be as much as a used shrick manifold.

for more torque and streetability

[steveo27]

[steveo27]

anyone else?

AAA dyno curve -




AFP dyno curve (stock in blue. catback exhaust in red) -



the AFP produces more low end torque, but how much of this is attributed to the manifold/cams vs MK4 ECU?

[steveo27]

[Ultramagnus0001]

When the change over flap in the manifold stopped working on my AFP, it felt like I loaded the car up with fat people and then it would come back on like a turbo after 4000 so RPMs.

[GTIVRon]

You can clearly see the effect it has a 4200 RPM. Notice how the Torque curve seems to start plummeting at 4K then levels back out again before dipping around 4200.

Coming from a 24v to my dizzy VR6 that loss is terribly noticeable. I'm also interested in this. Except I won't be doing an engine swap or OBD2 conversion.

[steveo27]

funny you mention dizzy VR.. that is what is currently in my MK4 that i plan on changin out..

[Grabbit]

anyone know if a mk3 OBDII TB will work or if not if a MK4 TB will plug in/adapt/work with OBDII?

[steveo27]

The first 2 pictures posted looks to be a MK3 OBD2 throttle body

[GTIVRon]

Any updates on this? Have you taken a crack at it?

[steveo27]

Nothing yet. Been WAY too busy with work and other stuff.

[93wolfsburg]

Any updates on this?

I am working on doing this same thing on my corrado, for me its more about aesthetics and the fact that i'm going vrt it would be easier for me to have the inlet on the drivers side.

I have concerns about the fuel injection. I dont really know a whole lot about injectors that fit in a stock mk4 manifold other than they look much different than the bosch style ones from the AAA motor.

Does anyone know if they will work with a mk3 obd2 ecu? If not will the bosch style fit in their place?

[steveo27]

Nothing. Sorry, never went through with this as I got bored with the car.

The research I did pointed me towards swapping all the MK4 stuff in and using the MK4 ECU

[93wolfsburg]

Interesting. I'll have to check tonight to see if the mk4 injectors are high or low impedance. I would imagine as long as both are the same impedance and flow the same rate it wouldnt matter what engine management.

Just curious how were you planning on sealing off what i guess is air injection on the lower half of the intake manfiold? Just a plug and a clamp?

[93wolfsburg]

so i ohm'ed out the mk4 and mk3 injectors they were 15.5 and 15 respectively. I think its safe to say we can interchange them i'm not sure about the flow rate though does anyone know the flow rates on stock injectors?

I guess in my case i'll just get whatever (mk4) injectors my software requires