[DavidPayne]

Hi,

I plugged in the small disa, and when I press the gas pedal it does move a little at about 4500rpm, but it does not shut completely.
With inpa I had trouble, but it does make it move a little every once in while.
Does that mean it's shot?
I did not update the ecu yet.

Thx,
David

[Hotter]

Does N52B25UL 753082806 from E60 2006 523i also works for 328i->330i?
From photos it has 2 hoses at the bottom.

[neilvan]

Originally Posted by Hotter

Does N52B25UL 753082806 from E60 2006 523i also works for 328i->330i?
From photos it has 2 hoses at the bottom.

I mean it'll bolt on, but the 2.5L manifolds have smaller diameter runners than 3.0 versions

[Hotter]

Thanks, I will use N52B30OL then, not sure which car it came from, but that should definitely fit correct?

[dragon-fly]

I will have a manifold + disa and possibly ccv for sale soon, am located in Canada, Montreal area, anyone interested?

Car is probably getting totaled out from rear end collision.

[omarg]

Originally Posted by dragon-fly

I will have a manifold + disa and possibly ccv for sale soon, am located in Canada, Montreal area, anyone interested?

Car is probably getting totaled out from rear end collision.

I'm in Ottawa, on if you have that intake for sale I would be more than happy to take it

[dragon-fly]

Originally Posted by omarg

I'm in Ottawa, on if you have that intake for sale I would be more than happy to take it

It's already gone.

Good luck!

[Arturas]

Can anyone please elaborate on this?
I run european e90 325i 160kW '05, on a pillar B there's indication it's equipped with N52B25A which is ok. But I've looked into my intake manifold it clearly has something DISA'ish things on it. As I understand, it must not have these flaps since it's 2.5L. If not DISA's what is it then? Not su much familiar with BMWs

[vilord]

You do have a DISA manifold already. 2.5 did get it in some variants.

[Arturas]

Thanks for reply. If there're DISA's, then couple more questions.

- Does that mean I have physically same manifold as the one found on 3.0L 190-200kW versions?

- If the answer is yes, going further, does that mean it's enough to have current ECU flashed/mapped (or even replaced with another sourced from 3.0L together with CAS and key) to reach more than 160kW? I know I won't reach 190kW since it's 2.5L but heard rumours that even 2.5L versions benefit significantly.

[neilvan]

Originally Posted by Arturas

Thanks for reply. If there're DISA's, then couple more questions.

- Does that mean I have physically same manifold as the one found on 3.0L 190-200kW versions?

- If the answer is yes, going further, does that mean it's enough to have current ECU flashed/mapped (or even replaced with another sourced from 3.0L together with CAS and key) to reach more than 160kW? I know I won't reach 190kW since it's 2.5L but heard rumours that even 2.5L versions benefit significantly.

Read 6 posts up on this page; I have a pic showing the difference between the 2.5L and 3.0L manifolds

[mattanderson]

What's everyone doing for DISA valves in 2023? Bite the bullet and go genuine BMW from FCP Euro?

[Spence90]

Most people recommend genuine only on disas just make sure any oil from ccv system is sorted or they'll keep failing

[Doreen]

yes, it makes a lot of sense

[firesnatch]

Originally Posted by mattanderson

What's everyone doing for DISA valves in 2023? Bite the bullet and go genuine BMW from FCP Euro?

I was cheap and got the ones that were $50 each from Amazon. We'll see how long they last. If I end up with problems I'll try the cheapest ones from FCPeuro, since they'll replace them for free if they go bad. The big DISA is easy to swap out. There's no oil in my manifold.

EDIT: Update, I've replaced my $50 Amazon large DISA twice now in 3 months. I lucked out and found some OEM BMW ones from a u-pull-it yard that were in excellent shape, 2018 and 2017 dates on them. Car runs smoother for sure with the OEM ones.

[vilord]

my small disa is apparently failed, and has been for months... i should probably do something about this.

what is recommended for "any oil from ccv system is sorted"? catch can added between the valve cover and the PCV heater port?

[mattanderson]

Originally Posted by firesnatch

I was cheap and got the ones that were $50 each from Amazon. We'll see how long they last. If I end up with problems I'll try the cheapest ones from FCPeuro, since they'll replace them for free if they go bad. The big DISA is easy to swap out. There's no oil in my manifold.

I took a different budget approach and bought 3 cheap N51 manifolds with original DISA's from eBay and tested the valves with INPA.

Out of the 6 DISA's, I found 2 fully working (1 large and 1 small, thankfully), so I'm running those.

If/when they fail, I might just convert to the N54 manifold. Gotta say the 3-stage torque is awesome, though. As is FCP.

[slow92]

Question, please forgive me if this is question has been answered

Has anyone done any testing with the 3stage + euro intake box and a tune?

ECS has the Euro N52 box which states being a "less restrictive" intake system, assuming this is true, would this not mean the airflow is 'freer flowing' and therefore able to take in more for the 3stage?

[alfredo330]

Originally Posted by ksfrogman

(1) Collector for intake air
(2) Resonating pipe
(3) Overshoot pipe
(4) Resonance pipe

DISA actuator motor



(1) DISA actuator motor
(2) Throttle valve

The actuator forms a unit with the drive. The actuator is driven by an electric motor and gearing. The control electronics are integrated in the DISA actuator motor. The DME controls the DISA actuator motor by means of a pulse-modulated signal. There are only 2 possible positions. The actuator can be closed or opened. When activated, the actuator moves the flap to each end position. Depending on the engine concerned, the N52 is fitted with 2 DISA actuator motors, or 1 DISA actuator motor, or without.

How it works
The power and dynamics of an engine depend heavily on the quality of the cylinder filling. The intake air mass oscillates due to the piston motion. These oscillations are overlapped in turn by oscillations from pressure peaks. To guarantee optimum air intake, the N52 engine has a three-stage differentiated air intake system (DISA).

The air intake guide is realized by a switchover mechanism in the inlet pipe with two DISA actuator motors and an overshoot pipe in the intake area. The DISA actuator motors are each driven by an electric motor. The two DISA actuator motors are of different sizes. DISA actuator motor 2 is fitted in the overshoot pipe and DISA actuator motor 1 is fitted in the collector for intake air in front of the resonating pipe.



1st stage - idling/lower engine speed range
At idle speed and in the lower engine speed range, the DISA actuator motors 1 and 2 are closed.
The intake air flows past the throttle valve into the resonance pipe. In the resonance pipe, the intake air mass splits. The air is fed via the collector pipe and resonating pipes into the individual cylinders. In this way, three cylinders are provided with a comparably high air mass.



2nd stage - medium engine speed range
In the medium engine speed range, DISA actuator motor 2 is opened.
In this case, it is assumed that the inlet valves of the first cylinder are just closing. The gas motion creates a pressure peak at the closing inlet valves. This pressure peak is passed on via the resonating and collector pipes to the in next cylinder in the firing order. This improves the filling of the next cylinder to be charged.



3rd stage - upper engine speed range
In the upper engine speed range, both DISA actuator motors are opened.
In this case, it is assumed that the inlet valves of the first cylinder are just closing. The gas motion creates a pressure peak in front of the closing inlet valves. The intake air mass is now fed via the resonating, overshoot and collector pipes.

EDIT: The firing order of the N52B30M1 engine is 1-5-3-6-2-4

Excellent explanation of the 3 stage manifold with dual DISA valves. However, could anyone with certainty please tell me what is considered to be DISA actuator motor 2 in the above quoted explanation? Would it be the smaller of the two DISA valves with part number 11617560538????

[firesnatch]

Originally Posted by alfredo330

Excellent explanation of the 3 stage manifold with dual DISA valves. However, could anyone with certainty please tell me what is considered to be DISA actuator motor 2 in the above quoted explanation? Would it be the smaller of the two DISA valves with part number 11617560538????

Disa 1 is small DISA (Right)
Disa 2 is large DISA (Left)