10-14-2015, 12:49 PM | #1 |
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M2 Turbo size?
Anyone have any idea what the turbo is in this motor. This will have a LARGe effect on chip tuning. If it has the same small turbo as M235i then the tuning is certainly less likely to see large gains than if it is a larger turbo.
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10-14-2015, 01:06 PM | #2 | |
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Typical N55 snail is disappointing.
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10-14-2015, 01:34 PM | #4 |
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The X4? I think it's pretty well confirmed it's the same engine. Why would that matter to you anyway? Still doesn't give us any information...
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10-14-2015, 01:43 PM | #5 |
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I am wondering also about the turbo size. More than likely it's bigger I would guess.
There is also something else I have been wondering. As we all have seen judging by the responses from members personal dynoed M4s, M5s, and M6s, And the M2's Nurburgring time of 7:58 seconds (some 14 seconds faster than the 1M with only 30 more horses, and -1 lb-tq less than the 1M with overboast), this car has to be seriously underrated with its HP numbers. Unless the 14 seconds is mostly due to a better chasis, tuning and suspension which I doubt, it would mean that the HP figures for the M2 in reality are closer to 400+. I cant wait for the first member to dyno his.
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10-15-2015, 08:45 PM | #6 |
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When I look at the power and torque curves, it indicates to me that the turbo is very small and already being pushed. while there is a little bump at 6500 rpm and that is where BWM list peak power, the shape of the curves show that really peak power for practical purposes is at 5500 rpm and the power is pretty flat to 6500 with a sharp drop off after that. Similarly the torque starts to drop off sharply at 5500 rpm. Total torque drops by about 25% between 5500 rpm and 6500 rpm. This leads me to believe that the turbo is maxed out. Maybe it indicates that BMW just tuned it that way, but I think its more likely that the Turbo just can't keep up above 5500 rpm.
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10-15-2015, 08:57 PM | #8 |
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If the turbo is indeed the same as the M235i then IMO this would be the biggest let down for the M2. Everyone here is worried about mirrors and seats, but I am worried about tuning potential and if it they maxed out the small turbo found on the M235i... then that may be the final straw for me. I hope that is not the case.
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10-15-2015, 09:21 PM | #9 |
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They do highlight the integration of the turbo into the exhaust manifold as the reason it is able to put out more power, but if I'm correct, the M235i has an exhaust manifold integrated turbo so they may be saying the turbo is different without having to say it's a new turbo. I feel like BMW didn't put all their cards on the table in this release.
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10-15-2015, 09:25 PM | #10 |
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Does BMW use a larger turbo in any other model that could be used in this car? My guess is that BMW used the same turbo from the M235 with a little more aggressive tune.
There was mention in other threads that the pistons were slightly different, so perhaps this N55 derivative can handle a little more boost than the one used in the M235???
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10-15-2015, 09:33 PM | #11 | |
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10-15-2015, 09:36 PM | #12 | |
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10-15-2015, 09:37 PM | #13 |
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Since the Turbo is now integrated into the exhaust manifold - replacing the turbo just got a whole lot more difficult. Maybe they can do some small mods to increase flow like they were doing on the 135i/335i N55 turbos. That power curve if its accurate really disappoints me. Shifting an M car at 5500 rpm!, seems rather un M like
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10-15-2015, 09:38 PM | #14 |
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Wouldn't surprise me if they are protecting the M4 by limiting any tuning potential to avoid people saving on M2 and just getting a tune which would wipe the M4 clean.
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10-15-2015, 09:40 PM | #15 | |
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10-15-2015, 09:41 PM | #16 |
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I think in general BMW puts a lot of effort into preventing people from tuning their cars. That may be one reason to integrate the Turbo, but my guess is the major factor was the elimination of any turbo lag. Seems like the BMW turbo engines have no or minimal turbo lag as a major design imperative.
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10-15-2015, 09:44 PM | #17 |
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A tuned S55 is a beast, it really has nothing to fear from this engine...
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10-15-2015, 09:50 PM | #18 | |
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10-15-2015, 10:03 PM | #19 | |
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10-15-2015, 10:08 PM | #20 | |
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10-15-2015, 10:31 PM | #21 | |
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I had a N55 135i with the PPK and then with the Cobb tune. When I did the dyno with the PPK max power was at 6000 rpm pretty flat from 5500. With the Cobb tune I sold the car before I had a chance to dyno it but it seemed to pull pulled pretty strong up to 6500 rpm. The ppk added about 20 hp at the peak, the cobb felt about the same improvement over the PPK, but no dyno results to say for sure. |
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10-15-2015, 10:35 PM | #22 | |
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