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02-04-2009, 03:54 AM | #67 |
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I believe the 1:1 ratio "myth" on dynos relates to Dynojets, that's what I was told anyway...
See http://www.roymech.co.uk/Useful_Tabl...fficiency.html - looking at the formulas for helical gears, you can see that gear ratio does have an impact on gear efficiency - the higher the gear ratio, the greater the efficiency. So you should see higher figures for a run in 3rd gear, vs a run in 4th gear. On my old RS4 it dyno'ed 320WHP in 3rd gear but only 260WHP in 4th gear, on a Dynapack. The operator thought the Quattro transmission was causing these weird differences as the front/rear power distribution was not consistent and would fluctuate wildly. |
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02-04-2009, 04:42 AM | #68 | |
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So under ''No Speed Restrictions'' requirements what is the Best Gear to Dyno the M3...? 1)3rd 2)4th 3)5th 4)Any...? P.S. Stil trying to find out why my car is putting (327 whp With Rpi Scoops,BMC Filter,and ACS Rear Mufflers heheheheh,maybe we should recalculate some factors on the Dyno se we can have percise resaults according to the factory claims) |
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02-04-2009, 05:02 AM | #69 |
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I ned tell some secrets about ECU flashing when I read here.
First of all I would like to excuse my bad english. 1. Is BMW able to notice a ECU reflash? Yes definitly yes! Since they have all CAN BUS OBDII interfaces and the new generation of Bosch ECUs MSSxx. BMW is reading out the ECU every time and they are sending the data to a central BMW server where those data records are randomly checked. I would say about every 10th of it. And they can defenetly see the speedlimiter and some other stuff. 2. dynos They have to be done in 5th gear. Power loss on these kind of dynos you talk about are between 8-12%. A complete reflash has no speedlimiter. So if we go on the dyno we are turnig off the speed limiter before and after the reflash. 3. bhp We are working together with German ingeneurs from Bayrische Motorenwerke. And the highest numbers you can expect form a Dyno is +30PS (I don't know in bhp and torque). That is the highest number which can be constantly reproduced and it is made in Germany together with a former Alpina developer and he is working together with us. Those low 17ps you allways hear about are made with a old ECU flash tool. And those are especially sold outside Germany because you can't Do certain things like the speed limiter and it was the first one on the market. So sometimes it works and sometimes not. We had to pay a whole lot of money to get that new ECU tool ready to work with. There are a few tuners who worked together to make it happen. |
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02-04-2009, 05:11 AM | #70 | |
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I will let PG reply to your other statements, as I dont know such details, I was going by what I was told by many people, including BMW service! However, How would I dyno before the reflash in 5th gear, when surely I would run out of speed because I would obviously hit the speed limiter? Prior to the reflash of the ECU, the speed limiter would kick in, in 5th gear on the dyno. YES, your right after the reflash I would be able to do my run on the dyno in 5th gear. But not before....sooo what sort of comparision would that be?? Not a very good one. So what you say...makes no sense!
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02-04-2009, 07:28 AM | #71 | |
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And I was talking about the Dyno Runs we are doing. |
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02-04-2009, 08:02 AM | #72 | |
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But I did my second dyno (after reflash from AA) on the same dyno, with the same gear ratios and Same factors. And the outside temperature was quite close too! So I think I did the best I could! And your right.. All that matters is the feel of the car. And all I can say is the feel of the car has changed tremendously
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02-04-2009, 09:06 AM | #73 | |
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02-04-2009, 12:01 PM | #74 |
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Only field reps have these interfaces. I have never heard of a single issues of an ECU on an NA car causing any issues. The members on the forum are referring to our BMW dealerships that service our cars, not BMW corporate centers. (who still do not read the actual files on the ECU, they normally just upload new firmware completely ignoring what was on the ECU to begin with....unless you are dealing with an N54 car...
O.K. I must say it could be a German (European) Problem. What I mean is that they can, not that they will notice a change. In Germany every Dealer has to have those interfaces. 5th gear will overheat a car on a dyno...... Never overheated on a Maha Dyno in 5th gear. Those are the reference Dynos with huge Air vents. Those are the ones we are using. Everyone had to pay a lot of money for the new "tools" to get into both sides of the DME's since BMW decided to lock the BDM... You are correct a few companies were actually flashing half of the ECU and claiming to offer an entire ECU reflash, we offer a complete reflash of the DME which includes both sides of the ECU. I am sure you guys are doing good work over there. It was not against your company. It was just in general because many companies are trying to tell people that BMW will not notice anything. Here in Germany you get in deep trouble right now if try to flash 335i without a permission. That is an result of all those ebay flashes all over the world. I think they will try to do it like that in the near future also in the USA. |
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02-04-2009, 12:58 PM | #76 | |
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02-04-2009, 01:53 PM | #78 |
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I will let you know when I finish my next tank of gas, so far, looking good. more or less the same! But im curious to see myself!
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02-04-2009, 02:01 PM | #79 | |
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Maybe you should come state side |
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02-04-2009, 02:02 PM | #80 | |
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...... now with the X pipe upgrade fuel mileage will probably be a bit less since you wont be able to control that right foot |
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02-04-2009, 02:12 PM | #81 |
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PG one thing that does affect your results on the Dynapack seems to be the ramp rate (i.e. the load the dyno will apply) - have you figured what this should be for M3 in third gear to get as close as possible to real world load that is applied on the road?
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02-04-2009, 03:00 PM | #82 |
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Actually it seems about right to me. If you look at the results that PG gained by these individual mods, 40whp isn't out of the question.
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02-04-2009, 03:08 PM | #83 | |
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Generally they're not additive, such that three individual mods that would give you 15 bhp each if done alone will probably add up to 32 bhp rather than 45. Dave |
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02-04-2009, 03:21 PM | #85 | |
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That would be awesome...Im working on it! But honestly, after the ECU - Im reallllly happy with the power in my car for the first time. The pulleys made a huge difference when I first installed them a couple months ago - but the ECU was by far the best mod Ive done (performance wise).
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02-04-2009, 04:06 PM | #86 | |
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02-04-2009, 07:25 PM | #87 |
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Time for you to do a dyno.....you're my only hope, as I live 500 miles from any dyno!!
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02-05-2009, 03:03 AM | #88 | |
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WOW! Its actually unbelievable how much you know about this stuff! By the way, good to know...because I wanted to break the 400 whp number. Next time, well do the 16 seconds ramp time! (PS. What is ramp time??)
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