[rosenbergendo]

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.

[PrematureApex]

Originally Posted by rosenbergendo

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.

Always been a big concern IMHO. No details yet. Might have to wait and see until someone actually gets a hold of one.

Typical N55 snail is disappointing.

[chmura]

What I want to know is if the turbo is different from the M40i.

[PrematureApex]

Originally Posted by chmura

What I want to know is if the turbo is different from the M40i.

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...

[phoenixbmwlife]

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.

[cwg]

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.

[OrangeCrush]

I think if it was a different turbo it would have been a highlight in the tech specs.

[filet.M2c]

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.

[SGL]

Originally Posted by OrangeCrush

I think if it was a different turbo it would have been a highlight in the tech specs.

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.

[M3R1]

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???

[cwg]

Originally Posted by synergist

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.

This is my perspective as well.

[OrangeCrush]

Originally Posted by ScottGregory

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.

That could be the case and did cross my mind when I posted it. It would be awesome if true....

[cwg]

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

[Hazey82]

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.

[OrangeCrush]

Originally Posted by synergist

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.

Would a different design with the manifold allow the turbo to be breath a little easier basically raising the limit at which it would be maxed out? I don't know?

[cwg]

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.

[M3R1]

Originally Posted by Hazey82

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.

A tuned S55 is a beast, it really has nothing to fear from this engine...

[mc3456]

Originally Posted by PhoenixWolf

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.

I'm willing to bet you are correct on both accounts: seriously under-rated horsepower and much improved suspension.

[mc3456]

Originally Posted by ScottGregory

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.

Couldn't agree more. Sensing this car is very conservatively rated. I'm betting it makes closer to 400hp and we'll see 0-60 MPH with DCT in the 3.9 sec range, especially if the M235i is achieving 4.4 sec times.

[mc3456]

Originally Posted by cwg

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.

The same thing can be said of the S55 curves though. I can tell you from firsthand experience that even my (tuned) M3 starts to run out of steam around that same point.

[cwg]

Originally Posted by mc3456

The same thing can be said of the S55 curves though. I can tell you from firsthand experience that even my (tuned) M3 starts to run out of steam around that same point.

Yes you are right - even a longer period of flat peak power for the S55. So maybe its the way BMW tuned it and they did that so you stay on the power band when you shift, which was the reported reason on the S55 power band. I still suspect that for both the S55 and N55TO motors, the turbos don't have a lot of extra flow potential that is not already being tapped into by the factory tune. That may be why your tuned M3 starts to run out of steam at about the same time.

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.

[kovsky]

• Closed-deck engine (water jacket surrounding the cylinders is sealed at the top, allowing for high cylinder pressures)
• High Precision Injection system
• Double VANOS
• VALVETRONIC
• Pistons from M3/M4 S55 engine, with top ring optimized for the use of
• grey-cast iron liners
• Crankshaft main bearing shells from M3/M4 S55 engine
• Turbocharger integrated into the exhaust manifold
• Aerodynamically tuned air intake manifold
• High performance spark plugs
• Extra water radiator
• Additional oil cooler for transmission oil (DCT only)
• Modified oil sump
• -Additional oil sump cover limits movement of oil under acceleration
• -Extra oil suction pump send oil back to rear pop oil sump when braking heavily
• -Special suction system for oil supply to turbocharger under high acceleration

I think it's highly unlikely BMW takes the extra work and design to make the engine more durable for added stress and not add the stress to it with a bigger turbo. That list sure looks like its ready for more boost and some track duty. Plus a larger turbo will provide more air without working so hard which means cooler temps for the track and that has to be a design characteristic they looked at. I sure hope they did otherwise there is always Pure...