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2010 2011 BMW 5 Series Forum F10 Watch the 2012 528i Turbo 4 (N20) Take on Its Older 6 Cylinder on the Road and Dyno |
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04-27-2012, 09:37 AM | #45 | |
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The power of N20 turbo is underrated by A LOT. It pumps out much higher hp & torque comparing to the I6. I'm very curious to know what's gonna happen if 2 engines put out the same hp at the crank. will there be any significant difference other than fuel efficiency?
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04-27-2012, 10:14 AM | #46 | |
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04-27-2012, 10:31 AM | #47 | |
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Why is this hard to understand? |
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04-27-2012, 10:50 AM | #48 | |
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04-27-2012, 12:09 PM | #51 |
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Good video...informative, short, sweet and to the point.
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04-27-2012, 01:53 PM | #52 | |
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04-27-2012, 03:10 PM | #53 |
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"In a proper race stock vs stock on a track, I'm pretty sure it will be a very close race considering the only difference between the two cars is the torque. However with a torque of 260 vs 230, the 2012 528i may be coming out of a corner a little faster than the 6 cyl."
Keep in mind the number of times you'll be able to go around the track without high-temperature related issues, for a short spurt surely the turbo-4, but for a longer race i'd put my money on I6 (or any NA engine) any day. |
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04-27-2012, 03:39 PM | #54 | |||
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04-27-2012, 03:40 PM | #55 | |
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04-27-2012, 03:42 PM | #56 |
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04-27-2012, 03:50 PM | #57 |
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Regarding torque vs horsepower, keep a couple of things in mind.
Torque is a measure of force. I can generate 240 lb ft of torque with a torque wrench. Imagine you attach a wrench to the drive line of a 5-series. I can generate 240 lb ft of torque, but what do you think my 0-60 time would be? I can answer that for you: I'll be dead before I get that car to 60 MPH! So if you want to know how well an engine will perform in your car, you don't just care about torque. The correct question to ask is, how many revolutions per second can I produce at 240 lb ft of force? Horsepower is the answer to that question. The formula for HP is t(r)/5252 Where t is torque and r is RPM. So torque times RPM, divided by 5252. So back to the original quandary. You're all staring at me asking, "Ok smart guy, if it's not the torque that explains why the N20 is faster, wtf is it?" To say the N52 or N20 generates 240 HP at the crank is a pretty shallow insight, because that's peak HP. Care to venture a guess how long the engine spends at peak HP during an acceleration run? It's a really small fraction of the time. More relevant is the question of HP curve over the RPM range. Turbo engines have a huge torque swell early in their RPM range. Compare the HP generated by the N20 at 2500 RPM vs the N52 at 2500 RPM and you'll begin to see why the N20 performs so well. The N20 accelerates the car faster, earlier because it's generating more force (torque!) earlier in the RPM range (horsepower!).
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04-27-2012, 03:55 PM | #58 | |
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I think it's a pretty safe assumption to say that a naturally aspirated engine should (statistically speaking) outlast a comparably engineered turbo engine. Turbochargers live a very hot and abusive life. They push the boundaries of material science. It's not unreasonable to say that they'll suffer failure before a naturally aspirated engine that is inherently simpler. EDIT: That said, I'll take the surging rush of a turbo car over N/A any day of the week. I'm addicted to FI!
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04-27-2012, 04:19 PM | #59 | |
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that is SHAMEFUL. this dealer should be sanctioned by BMW, they have the nerve to film themselves ABUSING their PRE-DELIVERY cars. jerks. and BTW, how do they measure "at the crank" hp? anyone help me out here? (thanks) . |
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04-27-2012, 07:53 PM | #60 | |
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Very well said. Last edited by TheRealOrosie; 04-27-2012 at 07:54 PM.. Reason: format |
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04-28-2012, 03:37 AM | #61 |
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haha Thats really funny you just wrote that. This dealer did a favor for you and obviously everybody else on bimmerpost since it was the cover of the front page on bimmerpost. So obviously it holds some weight in the community for them to put it on the very front page. What they are trying to show you is that this 4 cyl turbo motor can outperform the previous one in every way including horsepower, weight, FUEL ECONOMY, performance, ect... BMW has mastered the engineering of there turbo motors to really make them very durable and efficient. The technology that BMW has today is probably 5-10 years ahead of its time. The reason that they perfected the turbo technology is because very soon and I mean very soon, cars will have more restrictions on engine sizes and liter displacement. In the near future all cars are going to be electric or hybrid of some sort. It big time sucks but hey, the government can do what they want to do. and yes I would by a $50000 dollar car with all the amenities that a even base 528 has. I would by it for the way it handles and sounds. I would buy it because its a quality product and is faster than the previous I6 engine that was in it.. Numbers dont lie, neither do motortrend or car and driver. If your wanting a luxurious sedan that get incredible gas mileage and is actually fun to drive, then this would be the car. One of the above post said "if im going to get a 4 cyl i would rather get a honda lol. Have fun with the plastic and fake vinyl or whatever they use for the dash haha. Nothing has changed her except the new 528 just got even better and thats all they were trying to show which is exactly what they did. Go drive one then come comment back if it ANYTHING like a 4 cyl and back and post your results. like I said BMW is on top of turbo game and has damn nearly perfected it. Oh and also, DINAN for instance sell tunes/software for BMW's and with the new 4 cyl motor Steve Dinan stated that there is ALOT of room to make A LOT more power I bet with the DINAN stage 1 tune will give us almost 60-70 whp where as the 2011 I6 DINAN software gives you i think maybe 9 horsepower and the stage 2 software that is like 1500 bucks will give you 13 horsepower .Its going to be one fun engine from what I hear The only thing think they should have done differently is not try and calculate crank horsepower and just give us the real dyno numbers.
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04-28-2012, 06:46 AM | #62 |
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All true. The 4-cyl is a real performer. The car feels more nimble, but the sound is just not what I'm after. I would have a hard time adjusting to it.
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04-28-2012, 07:57 AM | #63 |
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I was in the camp too which believed that a 4 cyl does not belong in a 5. But after I got a 528 loaner when my 335 6mt was in the shop I became a believer. I just ordered a lightly optioned 528 which was sold at invoice; add the $1500 credit, Edmunds $1500 rebate, BMWCCA $1000 rebate, and the car was closer to mid 40ks. Does it sound like an I6? No, but the car is so well insulated that you'd have to drive with the windows opened to appreciate the sounds under the hood from the 535. I just hope they don't start putting M5's and M6's in the loaner pool
Last edited by Audionut; 04-28-2012 at 08:05 AM.. |
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04-28-2012, 02:50 PM | #64 |
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I think the answer to the sound issue of the 4-cylinder engine is for BMW to engineer an exhaust system that can mimic the sound of a 6 or even 8-cylinder engine.
I'm wondering what this 4-cylinder would sound like if you put a BMW Performance Exhaust on it. |
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04-28-2012, 07:46 PM | #65 | ||
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04-29-2012, 10:57 AM | #66 | |
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That said, a 4-cylinder doesn't have to sound like a riced out Honda. Have a listen to the E30 M3 for a great example of a kick ass four banger exhaust note.
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