11-21-2016, 06:18 PM | #1 |
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Anyone building a SINGLE TURBO S55 yet??
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* |
11-21-2016, 06:27 PM | #2 |
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TPG is/was but last i heard had trouble tuning it
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11-21-2016, 08:20 PM | #3 |
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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)
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11-22-2016, 09:06 AM | #4 |
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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 :/ |
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11-22-2016, 10:42 AM | #5 | |
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11-22-2016, 10:53 AM | #6 | |
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11-22-2016, 11:55 AM | #7 | |
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I completely agree, which is why I'm surprised there aren't several of them at least being started yet.. |
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11-22-2016, 12:36 PM | #8 |
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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...
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11-22-2016, 09:04 PM | #9 |
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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. |
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11-22-2016, 09:05 PM | #10 |
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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.
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11-22-2016, 09:29 PM | #11 | |
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11-22-2016, 10:09 PM | #12 | |
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The N55 is a VERY similar motor to the S55. |
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11-23-2016, 06:36 AM | #13 |
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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.
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11-23-2016, 07:37 PM | #15 | |
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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. |
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11-23-2016, 07:45 PM | #16 | |
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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. |
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11-23-2016, 10:18 PM | #17 | |
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11-23-2016, 10:59 PM | #19 | |
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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. |
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11-24-2016, 02:47 AM | #20 | ||
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11-24-2016, 04:15 AM | #21 | |
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11-24-2016, 07:28 AM | #22 |
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