AFI 24v VR6 Intake Manifold

[Dyldo]

Anybody seen these?
AFI VR6 24V INTAKE MANIFOLD Tuner Headquarters

Certainly look like sturdy and quality-built pieces of "art" but at $1300 USD you'd want to make sure there were decent gains.

Its easy to find proof that the 12v VR6 heads had terrible flow design (and then they talk of increasing valve size and cam lift duration) but there isn't a lot of info on the 24v.

As far as I can determine the 24v head was designed by Cosworth. I am taking that to mean that they redesigned the 12v head and that the two heads are relatively similar aside from the obvious number of valves.

[Golf Houso]

There is so much power you can make without increasing the compression ratio, you can still do a lot of breathing mods but you can only benefit from it to a certain point. People are just a bit bat crazy over bolt on VR mods tbh...

[Dyldo]

There is so much power you can make without increasing the compression ratio, you can still do a lot of breathing mods but you can only benefit from it to a certain point. People are just a bit bat crazy over bolt on VR mods tbh...

I don't understand what you're advocating here. Are you suggesting to do these mods (genuine intake mods, bigger valves, etc) over FI?

[pansy]

That is a truly beautiful manifold. I wonder if it still incorporates the variable intake runners? Or propably just for max gain I suppose.

[Tim]

Id say that intake manifold is designed with turbo conversions in mind given its identical runner length and the ditching of variable geometry. I dont think it would be a great option for an NA car.

[pansy]

Thats a pity, would look top notch.

[Lonewolf1983]

the 2.8L has a lot of room for improvement in the head (as proven by the R32), and the intake manifold isnt ideal if your doing big mods to the motor.
That one looks to be for F/I usage, and note that equal length on the outside, but the intake ports are different on 3 of the cylinders so not really equal length from the valve.

The dual runner intake is proven to make a very big difference to low end torque

[Manaz]

CNC Heads - VW VR6

CNC Heads - Custom made racing camshafts

[Manaz]

I don't understand what you're advocating here. Are you suggesting to do these mods (genuine intake mods, bigger valves, etc) over FI?

I think he was saying there's only so much power you can make before going FI, and if that's the case, he's right - in the end, without FI, you can only fill the cylinder with a single atmosphere's air pressure, and it's the O2 content that limits how much power you can make in the end.

That CNC page I linked to says the intake is pretty decent but the exhaust is terrible - doesn't surprise me given that between the 12v and 24v VR6s VW introduced the variable flow intake (you can get an after-market option to replicate it on 12v VR6s from Schrick) to optimise airflow for lower and then higher RPM...

[JVLR32]

Use a R32 head....already a better design!
To use the 2.8 24v head and to even match the performance of the R head is goin to cost u $$$$s......
And yes the head of the 2.8 24v head has room for more improvement

[Dyldo]

Can I take a guess that finding an R32 head would be very difficult?

[JVLR32]

YES Dyldo it would.....States is the way togo

[Lonewolf1983]

better off buying the whole motor

[Dyldo]

i'm just talking here, but if we asume that FI increases the engine output at a certain % over its starting point its logical to assume a turbo'd R32 engine would be quicker than a turbo'd VR6 24V engine (holding aside the obvious displacement issue).

If the R32 head really is so much better though, is there a logical answer as to why a fabrication company hasn't made one for consumption?

[Lonewolf1983]

of course a turbo r32 will make more power than a turbo 2.8, theres no replacement for displacement.

No-one is going to tool up a factory to make aftermarket heads for any car, let alone as small a niche market as the R32.