[BudVlad]

Originally Posted by rjahl

already know.

BudVlad, are you able to measure the throttle body clear opening on the three stage manifold air entry? Is it larger than the standard throttle body? Would a larger throttle body even help this manifold in the standard mounting?

Manifold openings are identical on both manifolds and the rubber seals are same size. Only inner diameter of N54 TB is larger.

[rjahl]

Originally Posted by BudVlad

Manifold openings are identical on both manifolds and the rubber seals are same size. Only inner diameter of N54 TB is larger.

Cool, so the throttle body is smaller than the manifold opening? How big is the manifold opening?

This might explain why Dinan claims 5hp gain for their milled out throttle body.

[BudVlad]

Manifold opening is 77.6 mm. Larger inner diameter of N54 TB is because of thinner walls.

[andrey_gta]

Originally Posted by BudVlad

Something cool for N53:
N54 throttle body fits directly on N53 intake manifold. Dinan high flow TB is $849, used N54 TB is fraction of that.

This is great!
Can we assume that n52 TB bolt holes are the same as n53? I mean the Manifold mold should be 95% the same except that one opening opposite of the throttle body spot.

Any progress on routing the other breather and oil return pipes?

[BudVlad]

If N54 TB bolts directly on N53 manifold I’m sure that it will bolt on N52 manifold. N54 TB would be more benifitual for N53 because instead of valvetronic it uses TB.

[rjahl]

Originally Posted by BudVlad

If N54 TB bolts directly on N53 manifold IÂ’m sure that it will bolt on N52 manifold. N54 TB would be more benifitual for N53 because instead of valvetronic it uses TB.

I think both engines will have the throttle plate fully open at full load. The benefit of a larger throttle body, if any will be at full throttle at high RPM when the engine is gulping large amounts of air.

The N54 manifold swap results show us that something is wrong with with the high rpm air flow in the N52 three stage manifold. I'm curious to find out what's holding it back. I suspect it's more than just a smaller TB.

I'm planning to add the MAP sensor data to my Testo log to see what's actually happening to the pressures at high rpm. Just can't do that until I return from my Holidays in Singapore.

Edit: Forgot to mention that the N52s had two throttle bodies. One for the N52 msv70 and one for the N52N msv80 variant. I don't think the former will work with the N54 throttle body. This should be confirmed.

[rjahl]

BudVlad,

Somehow I thought the N54 and N52 had the same primary runner length but I can't find the reference to that. You measured 13cm in an earlier post. Was that measurement the runner length for the N54 or N52 or both.

Thanks

[BudVlad]

The distance 13cm is the length of runners from the plenum on N54 manifold.

[Taskmaster]

Originally Posted by BudVlad

Distance from the flange to the plenum is 13 cm.
N54 TB 82 mm (outside diameter)
N53 TB 80 mm

Budvlad, Does the N54 TB bolt up to the N52 manifold ok? I might opt to have it bored instead of my N52 unit.

Edit, I didn't read far enough, but it does. The part number for the N53 TB is the same as the N52, meaning if a N54 unit works on a N53, it will on an N52. Hell yeah.

http://www.e90post.com/forums/showth...=860644&page=2

Word on the street is (from a very valid source) there is some extra power to be had if the plate is removed..thinking extra bore would be even better....

[Taskmaster]

Originally Posted by BudVlad

I think this is the purge solenoid for the fuel tank ventilation. I hope that N54 electric plug is same as N53 plug.

Bought a N54 TB, part does that have at be actively blocked off?

[matthewjmoser]

Originally Posted by TheAxiom

Bought a N54 TB, part does that have at be actively blocked off?

ooooo in here for results

[BudVlad]

You have to block off gastank ventilation on N54 TB because ventilation goes into the N52 manifold.