Anyone building a SINGLE TURBO S55 yet??

[BMW M4 PWR]

As we all know there's limitations to how much stock-framed upgraded turbos can flow no matter who builds them. The exhaust turbines just aren't big enough to support the CFM's needed to maintain peak torque values anywhere near redline. Which is both bad for HP numbers and the motor as your making too much torque down low and not enough up top where you needed for racing.

When will someone simply junk the stock manifolds for a 6 into 1 type design to allow for a single. With PTF's BM3 and PI we now have the support to make serious HP out of these motors with single turbo design hardware*

[apexit]

TPG is/was but last i heard had trouble tuning it

[BMW M4 PWR]

Originally Posted by apexit

TPG is/was but last i heard had trouble tuning it

Mods like PTF's new BM3 for the S55 with PI wasn't all sorted out then. If someone makes the hardware now it'll be easy to tune AND a lot easier on the motor/rods as you can shift the torque/power curve to the right and make more top end HP than we've ever seen so far while keeping torque under control down at the lower rpms (which is unusable anyway and unnecessarily hard on the bottom end)

[BMW M4 PWR]

Furthermore MoVit already did the legwork with their "MoVit 900HP" single turbo kit for the N54's... I'm sure the architecture be would nearly identical to make it for the F8X cars as well

Why do bmw owners ALWAYS wait years to do the most obvious sh*t!? When the new platform is out and these are no longer relevant THATS when they'll decide to offer them. lol :/

[soobieajax325]

Originally Posted by BMW M4 PWR

Furthermore MoVit already did the legwork with their "MoVit 900HP" single turbo kit for the N54's... I'm sure the architecture be would nearly identical to make it for the F8X cars as well

Why do bmw owners ALWAYS wait years to do the most obvious sh*t!? When the new platform is out and these are no longer relevant THATS when they'll decide to offer them. lol :/

Why don't you do it? I meant that in a polite manner. Not in an asshole kind of way haha

[shockin330i]

Originally Posted by BMW M4 PWR

Mods like PTF's new BM3 for the S55 with PI wasn't all sorted out then. If someone makes the hardware now it'll be easy to tune AND a lot easier on the motor/rods as you can shift the torque/power curve to the right and make more top end HP than we've ever seen so far while keeping torque under control down at the lower rpms (which is unusable anyway and unnecessarily hard on the bottom end)

I think the hardware would actually be the easy part of it. Nothing more than fabrication.

[BMW M4 PWR]

Originally Posted by soobieajax325

Why don't you do it? I meant that in a polite manner. Not in an asshole kind of way haha

No pun taken lol.. I'm considering doing it. However the MoVit kit is an easy start

Originally Posted by shockin330i

I think the hardware would actually be the easy part of it. Nothing more than fabrication.

I completely agree, which is why I'm surprised there aren't several of them at least being started yet..

[shockin330i]

Originally Posted by BMW M4 PWR

No pun taken lol.. I'm considering doing it. However the MoVit kit is an easy start

I completely agree, which is why I'm surprised there aren't several of them at least being started yet..

Correct me if I'm wrong but aren't the n55 and s55 virtually identical? With that said, aren't the the manifolds for the n55 and n54 virtually identical? Hence I'm with you, someone should be working on this already...

[CaryTheLabelGuy]

The issue is tuning. There are a lot of hurdles to overcome in the F8x's Bosch DME before you'll be able to go single turbo.

The S55 has two Electronic Wastegates and two MAF sensors. You'd have to figure out a way to force the DME to run in Speed/Density mode full-time so you could eliminate the MAF sensors and once you've figured this out, you still have TWO EWGs to deal with.

The other option (and probably the better one, tuning-wise), would be a standalone DME/ECU, but this is a long-shot for most street cars as you'd have to compromise on most non-essential items to make it work. This is OK for a race car, but a serious deal-breaker for most of us.

There are several other hurdles as well, but I digress.

[CaryTheLabelGuy]

Originally Posted by shockin330i

Correct me if I'm wrong but aren't the n55 and s55 virtually identical? With that said, aren't the the manifolds for the n55 and n54 virtually identical? Hence I'm with you, someone should be working on this already...

No, they are very different engines. But again, the problem isn't really a hardware one. Anybody can fab a 6 into 1 manifold and slap a properly sized turbo on it.

[shockin330i]

Originally Posted by CaryTheLabelGuy

No, they are very different engines. But again, the problem isn't really a hardware one. Anybody can fab a 6 into 1 manifold and slap a properly sized turbo on it.

While the engines are different, their blocks are pretty much the same.

[BMW M4 PWR]

Originally Posted by CaryTheLabelGuy

The S55 has two Electronic Wastegates and two MAF sensors. You'd have to figure out a way to force the DME to run in Speed/Density mode full-time so you could eliminate the MAF sensors and once you've figured this out, you still have TWO EWGs to deal with.

Aren't these the same 'hurdles' they knocked out on the N55 motors when MoVit made their single kit for them?

The N55 is a VERY similar motor to the S55.

[chewbakam4]

I don't think any tune is ready for this sort of complexity today. Welding up stuff is always the easy part. I think it'll take another year or two at least before we see big turbo conversions start happening but stuff happens for the S55 a lot sooner than others it seems. I guinea pigged a supercharger conversion with another car diving in early and it was an uphill battle the entire way because of tuning headaches with stuff that was still too new at the time.

[BMW M4 PWR]

If there's anyone that can do it (that's already tuned single turbo N54 and N55's with the BM3) it's Dennzo of PTF

[CaryTheLabelGuy]

Originally Posted by shockin330i

While the engines are different, their blocks are pretty much the same.

The N55 and S55 are not "almost identical". They are very different.

For starters, the N55 is an open-deck block, The S55 is a closed-deck block. The rest of the block is almost entirely re-designed/re-tooled over the N55. I don't really think it's even fair for BMW to use the S55 nomenclature for the S55, as its shares very little from it N55 sibling.

They're both 3.0L L6 engines with the same bore and stroke, that's about where the similarities end.

[CaryTheLabelGuy]

Originally Posted by BMW M4 PWR

Aren't these the same 'hurdles' they knocked out on the N55 motors when MoVit made their single kit for them?

The N55 is a VERY similar motor to the S55.

I'm not sure how they're tuning this setup. I'll have to look into it, as I'm not familiar with it.

Beyond that, the N55 is a single turbo setup from the factory, so it only has one EWG and one MAF sensor. This cuts down on the complexity from a tuning standpoint. The newer N55's share a similar DME to the S55, so some code could probably be ported over into the S55's DME, but I'm not sure how that would work as the S55 has other tuning considerations as compared to the N55. I'm guessing a based tuner could probably figure it out, with enough effort.

[BMW M4 PWR]

Originally Posted by CaryTheLabelGuy

the N55 is a single turbo setup from the factory, so it only has one EWG and one MAF sensor. This cuts down on the complexity from a tuning standpoint. The newer N55's share a similar DME to the S55, so some code could probably be ported over into the S55's DME, but I'm not sure how that would work as the S55 has other tuning considerations as compared to the N55. I'm guessing a based tuner could probably figure it out, with enough effort.

Yeah it's certainly not going to be a few strokes of the keyboard that's for sure lol.. But a capable tuner like Dennzo with experience with the platform (N55's DME) can do it. It's just a matter of someone rigging up the hardware (with the rest of the supporting mods) first...

[Tiago@VRSF]

The hardware is easy with any car. Manifolds/exhausts aren't nearly as difficult as the tuning.

[cookiesowns]

Originally Posted by CaryTheLabelGuy

The issue is tuning. There are a lot of hurdles to overcome in the F8x's Bosch DME before you'll be able to go single turbo.

The S55 has two Electronic Wastegates and two MAF sensors. You'd have to figure out a way to force the DME to run in Speed/Density mode full-time so you could eliminate the MAF sensors and once you've figured this out, you still have TWO EWGs to deal with.

The other option (and probably the better one, tuning-wise), would be a standalone DME/ECU, but this is a long-shot for most street cars as you'd have to compromise on most non-essential items to make it work. This is OK for a race car, but a serious deal-breaker for most of us.

There are several other hurdles as well, but I digress.

Motec M1 can do it, and you def won't sacrifice too much as it has full CANBUS integration. Now for Flexray I'm not sure, not sure if the S55 DME has flexray. The problem is getting someone to write the custom firmware.

There's a guy up in Oregon that can do it, he's done plenty of street & race cars with full custom M1 firmware.. question is... who's going to be the one to offer their F80 up with a turbo kit.

[Hammy_m3f80]

Originally Posted by cookiesowns

Motec M1 can do it, and you def won't sacrifice too much as it has full CANBUS integration. Now for Flexray I'm not sure, not sure if the S55 DME has flexray. The problem is getting someone to write the custom firmware.

There's a guy up in Oregon that can do it, he's done plenty of street & race cars with full custom M1 firmware.. question is... who's going to be the one to offer their F80 up with a turbo kit.

Me! I just saw this post after posting I want to be the first single turbo s55. But I'm in california

[FC4]

Originally Posted by CaryTheLabelGuy

The N55 and S55 are not "almost identical". They are very different.

For starters, the N55 is an open-deck block, The S55 is a closed-deck block. The rest of the block is almost entirely re-designed/re-tooled over the N55. I don't really think it's even fair for BMW to use the S55 nomenclature for the S55, as its shares very little from it N55 sibling.

They're both 3.0L L6 engines with the same bore and stroke, that's about where the similarities end.

Actually, according to BMW, they are 75% identical.

[CaryTheLabelGuy]

Originally Posted by FC4

Actually, according to BMW, they are 75% identical.

Ehh. BMW marketing, maybe.

Look, the S55 and N55 are very different engines, particularly when it comes to tuning, which is what is stopping the S55 from going single turbo.