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RB Turbo's N55 Turbo Upgrade, rounding the bases
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01-03-2014, 10:22 AM | #155 |
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We are going to only make one unit initially. This will be going to BMS to test as they have direct experience with the N55. Next week should have most of the groundwork performed and be well underway on this hybrid, so far by the things we are seeing it is going to be particularly easy the route we are going (combined with some ingenuity/creativity)- all of which ultimately means a very reasonable cost.
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01-03-2014, 11:47 AM | #158 |
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Give me 450whp and boost not falling off hard until redline and I am sold
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01-03-2014, 02:24 PM | #161 |
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01-03-2014, 04:19 PM | #162 |
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The VTT has only put down 468 so far. I agree it has some more in it, but I think it is a stretch to say it will hit 500 as it stands right now. I think 480 is very doable and it may hit 500, but it has a ways to go. The VTT is also running larger wheels than the RB, but RB has said the housings are maxed before the VTT wheels are. There is potential for it to match the VTT output, but even if it "onlyl" hits 450whp I would probably still do it as long as the VTT doesn't get to like 550whp or something crazy.
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01-03-2014, 05:56 PM | #163 |
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That VTT number was not on pump fuel. I'm really only interested in what these turbo upgrades can put out on actual gasoline that I can readily buy. Forget all this race gas/ meth crap.
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01-03-2014, 08:21 PM | #166 |
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It already has, couple guys on N54 with RB turbos running xdrive with no failures.
I'm already launching the hell out of it, ran a 12.1 on the strip with my N55 cutting 1.67 60ft FBO with 50% e85, which is well over 400lbft of torque. I know a N54 with xdrive on these forums that has launched it over 100 times on the drag strip running in the 11's and no problems at all - he's making just as much torque as an aftermarket N55 upgrade will. Launching any AWD car presents risks (plenty of GTR drivetrains blew up in the early days) but Xdrive has proved pretty robust so far. |
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01-04-2014, 05:25 PM | #167 |
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Can't wait to hear more about the progress of this kit as it's developed. If a reliable tune can be had on pump gas, I'll be in line to put it on my xDrive.
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01-11-2014, 12:04 PM | #168 | |
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We wont know until its tried...i'm trying to instigate jeff to install it and try it, i'm optimistic that the n55 internals can hold 550-600 and beyond |
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01-16-2014, 09:17 AM | #169 | |
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08 135i 6m - 12.1@120.2 2.0 60ft - JB4/Meth - SOLD
09 335i e92 Mtech - RB FBO |
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01-16-2014, 09:20 AM | #170 | |
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No one will ever forget race gas / meth , or e85. Its whats needed to utilize these upgrades.
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08 135i 6m - 12.1@120.2 2.0 60ft - JB4/Meth - SOLD
09 335i e92 Mtech - RB FBO |
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01-16-2014, 09:28 AM | #171 | ||
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Past: 2013 bmw 335i, 2011 bmw 335i coupe, 2016 bmw m3 |
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01-16-2014, 09:48 AM | #172 |
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Wheel performance is measured from a specific native housing that is no longer in place with hybrid turbos, which is something that some tend to omit from their respective turbo performance expectations. This means that when you build a hybrid turbo you have to consider the housings you are working with and accept that they really do have a detrimental affect on the wheels performance. Based on the results mentioned above, which were per my expectations or perhaps slightly above, the N55 turbo will likely be tapped out around 475rwhp regardless of wheels employed due to turbine housing limitations.
The key then as the consumer is to realize/know what gains you will get for the $$$ and decide if it is worth it or not. The gains are not poor, but for the $$$ spent for what is being offered today it is very clear the bang for the buck could be MUCH better with a full upgrade (as we are working on). As we thought right out of the gate, the only way a hybrid upgrade makes sense for the N55 therefore is if it is able to be kept fairly inexpensive (which we now believe we can due to the sourcing of some key components). So back on that topic here is a little update- the N55 turbine housing fixture is complete. We expect to start some machining on the turbine housing next week. As mentioned before we have a couple compressor wheel decisions to make, but feel going slightly smaller will be beneficial in the long run. If found to be incorrect we can increase sizing as needed, but feel the turbine to compressor match is best as we will be doing it initially. Thanks, Rob |
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01-16-2014, 09:56 AM | #173 |
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I hate to say this, but I think the bigger problem is that nobody except 2011 cars will be able to run this. I just don't know the market is there for you to recoup your costs. I saw over on N54Tech that terry said the backend flash is mandatory for upgraded turbos on N55, and the fact of the matter is that Cobb essentially came out and said they are giving up. The exact quote was, "I can't even see any light at the end of the tunnel on this project right now."
I would be thrilled to spend $2xxx and get 475whp, but that option just won't even be available to me thanks to lack of tuning. |
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01-16-2014, 10:08 AM | #174 | |
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01-16-2014, 10:26 AM | #175 | |
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01-16-2014, 10:27 AM | #176 |
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