n55 vs n55HP  How do we get that extra power and torque?
I see that the N55HP has 13 more hp and 30 lb/ft torque vs the standard N55 in our F10. The N55hp comes in the 2012 and newer: F12 (6series), F21 (1series) & F01 (7series).
Anyone know exactly how this power is achieved and if we can buy some OEM parts to obtain the extra power and torque of the N55HP? 
15hp is not really a noticeable difference, not sure why you want to do that.
If you want more power, the best bet is a tune. I highly recommend the N55 Burger tune I have in my car. It's +50hp and +80 torque for $500 bucks. The power is night and day. 
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I guess my thread turned into a BMS tune infomercial :rolleyes:. The point of this thread is not to get into a debate about TRUE power gains with piggyback tunes. I simply want to know how the power gains are had with the N55HP.
From my past experience, these slight power gains were often had from tweaked intake and exhaust manifolds. Of course with FI (forced induction) vehicles, all it takes is a little programming and or an increase in boost. 
I'm curious about this as well. I posted in the F12 Forum the question of what the N55HP has that's different from the N55 that gives it that little extra boost in power.
What I'm really curious about is how much REAL power it has over the N55, as the N55 is very underrated (at 280 RWHP putting it around 330340 actual crank HP). 
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How are you calculating that... lol 330340??? You add 10%12% which puts you right at 310. Not arguing with the number just your calculation. :dunno: I am hoping to dyno my car some time next week or two  time permitting. Then I will throw on the stage 1 (If I can ever get it back from my deadbeat friend bigdeep:rofl:) Then I will post some numbers. BigD  I believe the answer to your question is going to be software. I tried searching for you, but everything just says "fine tuning" This to me indicates that perhaps it was nothing mechanical. 
I agree with Miami. Its just a software tweak. When you're dealing with a turbo'd car a simple addition of 12 psi can get you that additional 1520 HP.
And I am glad too see that smash has came to a realization of the true HP increase of the N55 BMS tune.:thumbup: 
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I have no idea of why this Power kit has not been offered for the F10. 
I have the power up kit in my 2011 335  although the #s are low as far as increase it completely changed the car. Torque is very low and pulls hard to redline also seems to build boost much faster. Looking to do Dinan on new 535 when they finally come out with it.

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There's a dyno sheet I recently saw that said a "general rule is to divide by .xx(number). When I did that, it came out to roughly 20% drivetrain loss. Also, if you look at the 535i's consensus trap speed in the 1/4 mile, being around 100 MPH (give or take depending on various tests), and weighing at about 4,000 lbs, it shows that it should pin it right at around 340 HP. A good basis I like to use is a car I used to be involved with in terms of HP/Track times, which is the SN99 Mustang GT. It was a very pure basis of how RWHP and track times equate. For example: The 5 Speed Manual 2004 GT made 225 RWHP on the money, which would put it at 260 HP on the money. The Auto version of the same car sucked out an additional 1015 RWHP, putting them generally at around 210 RWHP. Those cars weighed at around 32003300 lbs. The Manual GT did exactly a 14 Second 1/4 at 100 MPH, those two numbers perfectly aligning with each other as a good power/weight ratio VS track time/MPH ratio (same exact numbers the 535i generally does). So, if you have a 3200 lb GT making 225 at the wheels with only little drivetrain loss due to being a Manual and doing a 100 MPH trap speed, and then add 700800 lbs to it (i.e now making it a 535i) then you'd have your trap speed dropped to 9293 MPH (1 MPH for ever 100 lbs). Therefore, in order for the 535i to recapture that 100 MPH trap speed AND taking into consideration it's an Auto tranny which means it has even more drivetrain loss, you'd need at least 80 more HP, putting it at 340 crank HP (since the GT has 260 crank HP and does the exact same numbers). Sorry if that's confusing but hope it makes sense in terms of being a look into my crazy head. :D 
so is this better than Dinan Stage 2?

I want to know what drivetrain Miami is using o.O I would LOVE to have only 1012% loss.

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A dyno of a 535i put 277 RWHP and 283 RWTQ to the wheels, straight from the showroom floor (you'll see more RWHP add up as the motor breaks in). You'd be a one of a kind to have less than 15% drivetrain loss in an automatic, more likely 1820%. Also, a 4,000 lb car won't be trapping at 100 MPH with only 300 HP at the crank. Look at statistics of other cars with an *actual* 300 HP, in order to trap that high they need to weight considerably less than 4,000 lbs. 
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But based in your second sentence, I think you meant to say that it was Duhbya math. At any rate, KA is probably right, but perhaps a bit high if you consider the 5er has an 8 speed gearbox. What matters is the total area under the HP curve from start to finish (I'm trying not to use math here). With the 8 speed gearbox, you stay at the top of the curve a bit more so you end up with more total underthecurve area by the end of the run compared to say, the GT. So there is *some* benefit to the 8 speed gearbox (maybe it's 1015 HP benefit or something; to know would require using math and I'm many years removed from that ;) ). But even if you assume a super efficient 15% drive train loss, then 277 RWHP puts it over the 300 @crank HP claimed by BMW (about 326 HP, to be more specific, which would probably be enough to get the vehicle to 100 trap with the 8 speed gearbox). Corey 
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So we see one or 2 dynos @260/270 and now its set in stone? Come on I know you guys have seen some high reading dynos not to mention inaccurate correction factors to show some high readings.. What do you say about those stock dynos that are in the 240s?
Plus cordoor is correct that you have to take into account our 8 speed tranny. There are many ways to push a car down the track and having proper gearing helps quite a bit 
The link below calulates 4000lbs will need 313hp to attain 100mph in a 1/4 mile. Before anyone poopoos the calculator, trust me, I don't believe in the accuracy of the dyno results either. :rolleyes:
¼ Mile Elapsed Time and MPH Calculator 
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The 535i (RWD) is 4090 pounds according to BMW's website. That calculator says 320 HP is needed to reach 100 MPH at that weight (319 HP doesn't quite get you to 100, 320 gets you a bit over). But I don't know how that calculator could be accurate. HP is just a calculated value. It is calculated by multiplying the torque by the RPM and then applying some other adjusting number that pulls it into the range its in (I don't remember what that is). So if you are looking at a graph of HP over RPM's, what matters in terms of power to the pavement is the area under the curve. And as everyone has noticed, there is more area under the curve on the right side of the curve (duh). So the goal is to get to that right side of the curve as quickly as possible and then to stay there as long as possible. Gearing is critically important to this. With an 8 speed tranny, you can stay near the right side of the curve longer because when you shift from say, 1st to 2nd, the RPM's drop, but they don't drop as much in an 8 speed tranny as they would in a 6 speed tranny. You get to stay more towards the right side of the curve and so you put more power to the pavement (more area under the curve there). So gearing matters. I don't see a way to input gearing on that calculator. But not only that, they are only asking for peak HP, so I can't see how they can calculate how much power you put to the pavement and consequently, how quickly you get to 1/4 mile. Corey 
Generally these calculators use measured data from thousands of data points and then apply a curve fit. As I said, I don't believe in dyno results either, or at least not rolling dynos. ;)
BTW, having a sufficient number of gears is good, but you are applying zero power while shifting, so having more gears isn't always better. 
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Gearing is a good point to bring up, but still. Using this example again, as I find this particular car a very accurate and solid basis for HP/Weight=Trap Speed.. the '03 Mustang GT with MANUAL (I'd assume the extra lack of drivetrain loss there could possibly equal out missing out on a few gears, who knows, but for the sake of argument....) has 260 HP on the nose (crank), and traps 100 (average). The 535i traps 100 MPH (average, I've seen some as high as 102 and some as in the high 90's, but with more broken in motors, I wouldn't be surprised if low100's becomes more common), and weighs a good 800 lbs more. So, using the 100 lbs = 10 HP rule, we're looking at around 340 HP. Considering gearing, and efficiency, I'd guess the N55 is putting 325340 at the crank (a fair guesstimate). Dyno's will range everywhere, but what's important is trap speed when trying to determine genuine power rate, IMO. So some N55's will dyno less, some more (and especially more when broken in some). Remember, some guys with N55 3Series' have apparently dyno'd in the 290's, stock. 
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