[CobraMarty]

Originally Posted by JuniorB

CM, off topic question. You were kicking the n55 manifold on the n52, did you ever match it up, do the ports line up? I'm daydreaming and can't find a definitive answer? Ty much.

N55 turbo exhaust manifold and N52 head...
Ports all line up, same bore spacing, but then bolts don't line up.
Line up some bolts up and then the ports don't line up.

To bolt on N55 turbo manifold would require an adapter. 1" thick would space the turbo out for more clearance with the water pipe connection.
Adapter would bolt to the head and then have N55 placed studs to locate the manifold.
I bought a piece of HDPE to make the adapter and then got sidetracked with MILVs.

[JuniorB]

Ty for the info, I want to try something, I'll see if I can make it happen.

[CobraMarty]

Originally Posted by Biginboca

I ran MILV’s with stock tuning for about a week while I had some tuning issues sorted. Car ran great no issues at all, and after a few days it seemed to pick up some power.

Apparently there are adaptations that occur over time which may give more than stock power with the MILV’s and no custom tune.

Thanks.

[W37V]

Now that my car finally passed the inspection (had to swap back stock headers), I will be putting these in. Hopefully I do it before going on vacation.

[varoadking]

Enjoyed our chat, Marty...
Thanks,
Greg

[varoadking]

My 128i is now in at BPC for the MILVS treatment...

[CobraMarty]

They are also doing a S55. It's a 'MILVs Treatment Center'.

[varoadking]

Originally Posted by CobraMarty

They are also doing a S55. It's a MILVs Treatment Center.

You should be proud...

[CobraMarty]

Ordered 38 more sets, 230 pieces (38+2 pieces).
That's all BMW had in the US and Germany.

[varoadking]

Originally Posted by CobraMarty

Ordered 38 more sets, 230 pieces (38+2 pieces).
That's all BMW had in the US and Germany.

Marty going all-in...

[CobraMarty]

Either brilliant or a blunder. All for my BMW 'Brothers'.

Trying to cut down on lead time. 2-3 weeks to get parts, 4-6 weeks for the machinist.
I figure I need about 3 cycles going at the same time, about every 2 weeks. Then it will be self sustaining.

[PORTMOODY]

Originally Posted by CobraMarty

Either brilliant or a blunder. All for my BMW 'Brothers'.

Trying to cut down on lead time. 2-3 weeks to get parts, 4-6 weeks for the machinist.
I figure I need about 3 cycles going at the same time, about every 2 weeks. Then it will be self sustaining.

You have probably triggered a couple production runs now on account of your purchases.

[F31cruisin]

I gotta say, after installing these the car feels much stronger. Its always had a nice pull, but there is a difference now, and this is before a tune, though I do have the BMS powerbox which till be taken out.

Sometime within the next few weeks/month, I should have some dyno numbers with an AA tune. That should be interesting to see.

[CobraMarty]

Originally Posted by E90cruisin

I gotta say, after installing these the car feels much stronger. Its always had a nice pull, but there is a difference now, and this is before a tune, though I do have the BMS powerbox which till be taken out.

Sometime within the next few weeks/month, I should have some dyno numbers with an AA tune. That should be interesting to see.

Thanks, this is most interesting.

BPC showed no difference in before/after power when installed. This was on a dyno, no run time after install. After BPC MILVs specific tune, dyno showed over +10rwhp gains.

You installed, no tune, drove and now 'notice a difference'. Is this due to 'adaptation'? If you cleared the 'adaptations' would it be slow/no gain again and then increase over time?

Mind you, the increased lift only occurs over 80% Eccentric Cam position which roughly equates to over 80% throttle pedal position.
The more WOT runs, the more adaptation occurs.

It does seem that the 'MILVs specific Tune' does increase power MORE than adaptation alone.

[hassmaschine]

adaptations are going to be limited to minor adjustments in AFR, which will happen regardless. The model that computes air mass etc. will still be incorrect as I've maintained before, the DME has no way to adapt for higher lift than it was programmed for.

I really want to get a set installed into my 330i - hoped to over Christmas break, but I was just too busy. If I had an actual reason to pull the cover (gasket leak or something), it would be an easy sell, but I'm "lucky" that my N52 doesn't leak anything.

[CobraMarty]

Yeah but it has a MAF sensor and knows exactly how much air is actually 'ingested' into the engine, no table or calculations required. More air in requires more fuel to achieve desired target AFR.

Now you are stuck with the stock target AFRs and we know that these are lean and the engine responds with more power with slightly richer AFRs. That richer AFRs need to be programmed into the DME.

[hassmaschine]

the MAF sensor is used primarily for emissions reasons - the N52 doesn't even need it, and IMO, it runs best without it.

[CobraMarty]

Fair enough.

So- more power with MILVs, even more power with tune designed for MILVs.

[stevesingo]

Originally Posted by hassmaschine

the MAF sensor is used primarily for emissions reasons - the N52 doesn't even need it, and IMO, it runs best without it.

Euro cars don't even have one!

[F31cruisin]

Originally Posted by CobraMarty

Thanks, this is most interesting.

BPC showed no difference in before/after power when installed. This was on a dyno, no run time after install. After BPC MILVs specific tune, dyno showed over +10rwhp gains.

You installed, no tune, drove and now 'notice a difference'. Is this due to 'adaptation'? If you cleared the 'adaptations' would it be slow/no gain again and then increase over time?

Mind you, the increased lift only occurs over 80% Eccentric Cam position which roughly equates to over 80% throttle pedal position.
The more WOT runs, the more adaptation occurs.

It does seem that the 'MILVs specific Tune' does increase power MORE than adaptation alone.

This makes even more sense. I feel the biggest difference up top, yesterday I felt it more than ever. I have a little strip of road I take every day, its my WOT road. Never anyone on it and its paved well. I usually hit about 80 (its not a long road, and I have to come to a stop at a stop sign), yesterday I was nearing 95, and the pull up top was noticeably different.

[bbnks2]

Originally Posted by hassmaschine

the MAF sensor is used primarily for emissions reasons - the N52 doesn't even need it, and IMO, it runs best without it.

Does the N52 have a MAP sensor in the intake manifold like N55? That is what the dme uses on the N55 to calculate mass airflow and drive load, fuel, timing... right?

[hassmaschine]

Yes, but it's not a big part of the load calc - because the throttle is always open, MAP will almost always be 1 bar regardless of load.