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02-21-2014, 10:05 AM | #89 | |
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02-21-2014, 10:39 AM | #90 | |
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Besides, we didn't really jump down your throat. We just asked for your sources, which is a perfectly legitimate thing to ask of people. |
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02-21-2014, 10:43 AM | #91 | |
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02-21-2014, 10:50 AM | #92 | |
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Going to Shift S3ctor tomorrow? Would be terrific to have you. And sorry for derailing the thread a bit.
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02-23-2014, 04:34 PM | #94 |
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Interesting results, what parameters in BT did you utilize to see knock events? thx in advance.
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02-24-2014, 08:23 AM | #95 | |
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02-24-2014, 08:56 AM | #96 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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There is no power output difference between motors, but there certainly could be different mechanical efficiency losses between transmissions.
Here's a list of all the bone stock entries from the Dyno Database SAE corrected on 91 octane -- in order of output. The lowest DCT is 15 whp higher than the lowest 6MT. The highest 6MT is 20 whp lower than the highest DCT. Average DCT in the list is 337 whp. Average 6MT in the list is 326 whp.
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02-24-2014, 08:58 AM | #97 |
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Dct seems to dyno a little bit lower than the 6mt cars, somewhere in the 10whp range. Likely due to more windage and internal friction in the dct with its increased number of spinny roundy bits
Accel in gear seems to bear this out too based on some stock accelerometer data I've seen, with the extra shift speed and gearing advantage of the dct making up for it especially in the first three gears. Once you get into higher speeds with the 3-4 and 4-5 shifts, the 6mt starts making ground on the dct. Makes sense given the time in gear is shorter and shift speed makes a bigger difference at low speeds. Considering its almost a 50lb weight penalty i think they did a great job offering an automatic with zero performance disadvantage and many advantages in the real workd, dynos are dYnos snd the road is the road
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02-24-2014, 09:03 AM | #98 |
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02-24-2014, 09:07 AM | #99 | |
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I wonder then why the 6speed cars seem to have steeper accel curves at higher speeds in the data i looked through? It was only a few cars so maybe not enough to show a trend, could have been a couple of weaker or heavier optioned dct cars Actually now that i think of it i dont even know if the vbox data i looked at were done on the same day Also just realized you'd have to dyno the dct in 7th to use a 1:1 ratio, which i am sure nobody is doing
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02-24-2014, 09:21 AM | #100 | |
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02-24-2014, 10:38 AM | #101 | |
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02-24-2014, 11:15 AM | #102 | |
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So as long as the 6MT wasn't dyno'd in 3rd or 5th, then I think it's a fair comparison. Longboarder: DCT-5th Sig5x: DCT-4th Green-Eggs: DCT-5th Sleeper: DCT-4th MexicanMike: DCT-4th Catpat8000: DCT-4th KZ: 6MT-4th |
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02-24-2014, 06:28 PM | #103 | |
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There isn't enough data to state a result with any kind of certainty and the error bars are pretty wide on these results. There are only 7 stock MT cars dynoed with 91 AKI and 10 cars with DCT dynoed with 91 AKI. If you only look at these cars, the DCT cars, on average, dyno HIGHER, not lower. Stock M3, DCT, 91 AKI: 334 hp, stddev 8 hp Stock M3, MT, 91 AKI: 326 hp, stddev 9 hp So the MT car may have a HP advantage but the current data doesn't support that hypothesis. I have not corrected for the gear used to dyno the cars (because I don't know it). Also, I would like to stress that if we had 3x or 4x as many results, we could learn a lot more. We could state with more certainty what gears produce best power, what bolt-ons produce, etc. Pat |
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02-24-2014, 06:31 PM | #104 |
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03-16-2015, 11:18 PM | #105 |
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Reviving this.
I'm looking for a local (Greater Seattle Area) Dinan Stroker to dyno back to back with my FBO Ethanol Tuned 4.0. I've offered lunch and free dyno time, we'll see if anyone bites. |
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03-17-2015, 12:15 AM | #106 |
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Trailer it down here to the San Francisco area, I'll arrange for the strokers, provide full data logging, pay for the dyno time, AND take you to Napa for wine tasting.
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03-17-2015, 03:41 AM | #107 |
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...The funny thing is that in spite of the inevitable outcome of normal people concluding that the Dinan Stroker isn't worth it, this proposition is still tempting minus the whole wine thing.
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03-17-2015, 07:03 AM | #108 |
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Worth it is a relative term. People like me, who will never be able to afford a Dinan stroker, have to be content with the gains from bolt on mods that cost 1/10 as much. Definitely more bang for the buck -- maybe 50% of the gain for maybe 10% of the cost. But if money was not a concern and I wanted my naturally aspirated M3 to be as powerful as possible, I'd be looking at stroker motors.
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03-17-2015, 01:39 PM | #109 | |||
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If you cant make it but have any other suggestions or input before the day, your advice is appreciated. Quote:
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03-17-2015, 02:54 PM | #110 | |
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I'll try to make it. If I do, I'll bring my data logging equipment. |
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