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BMW 3-Series (E90 E92) Forum
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My Dyno results
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03-26-2014, 10:00 AM | #2 |
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dixy great run but YES you lost somewhat around 20 hp , btw did you get the torque numbers if not call me and i will send you pics via whastapp so you can see where to get the correct readings ok
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03-27-2014, 12:26 AM | #5 | |
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The guy placed tape on one of the belts and used an optical tool to register the RPM. the tape just flew off the belt. No RPM, no torque. |
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03-27-2014, 12:27 AM | #6 |
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03-27-2014, 12:34 AM | #7 |
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They should be able to get an rpm reading by logging a couple rpm points into the computer at different speeds in the gear you dyno in. Shops probably aren't familiar with doing that unless they do a lot of diesels. I know I wouldn't have any idea how, but I don't own a dyno shop either.
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03-27-2014, 12:40 AM | #8 |
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They work mainly on gassers and a few diesel trucks.
For the trucks they use a magnetic thingy attached to one of the pulleys and an optical tool to register the number of engine revs. One of the guys there was looking for the engine coils right after I told him it is a diesel car, and tried to pull the engine cover off after only detaching the engine oil cap. I stopped him. He is the one who placed the tape on the belt for the rpm readout. |
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03-27-2014, 08:10 AM | #9 | |
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03-27-2014, 09:49 AM | #10 |
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Amigos I have the photos WHERE to hook up for the torque measurements I will post them soon ok
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03-28-2014, 01:02 PM | #13 |
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Here are the photos
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03-28-2014, 07:54 PM | #14 |
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Should be totally unnecessary if they know the system but if you need to be certain the rpm is exact the wire is good. By "the system" I mean the dyno, not the car
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03-28-2014, 08:01 PM | #16 |
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I assume its reading the pulses from either the cam position or crank position sensor, just like they would do for the coil wire on a gas car. No need to tap the wire. Its basically just an ammeter setup.
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03-29-2014, 01:01 AM | #18 |
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Could be accurate. The guestimate for auto trannys in the past was 25-30% depending on the trans. The new ones are much better, 20% is a lot better than 25%. I don't know that there are hard numbers you could find, everything I've ever seen is "my buddy has a friend who heard about a guy who said..." kind of stuff.
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03-29-2014, 08:08 AM | #21 |
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I made 294 whp/ 393 wtq
JBD @ 65-70% with a mustang dyno. I just can't find my sheet nowhere ![]() Now I'm running 100% but I always have to let it warm up before nailing it! |
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