09-14-2016, 03:38 AM | #89 |
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Are you referring to fuel octane grades?
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09-14-2016, 09:00 AM | #91 | |
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Is 93 commonly available where you are from in California? I had thought it was 91 down there.... |
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09-14-2016, 10:04 AM | #92 | |
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The short answer to your question is we use both. We do use a Dynapack chassis dyno and a DTS engine dyno for all of our testing. Like most OE's, we publish our crank numbers, not wheel horsepower numbers, simply to keep things as accurate as possible. Dinan tests multiple cars with multiple runs and averages them so no one chassis dyno test would be representative. When we compare our engine Dyno Data to our chassis dyno data we find that most if not all chassis dynos, including ours, overstates the lower RPM torque values. Our chassis dyno does not do a coast down for inertia and friction corrections. If we are using the chassis dyno once we have performed multiple Chassis dyno runs and averaged them we apply different correction factors to each RPM to correct for these inflated torque numbers. All this is done to ensure the most accurate reporting to our customers. We list both Stock and Dinan numbers using the same corrections to ensure the comparison is fair. If we are using the Engine Dyno the data is just averaged over multiple runs to get a fair average performance. With both the engine dyno and chassis dyno we ensure the room is as close to standard weather conditions as possible and all dyno runs are performed in the same weather window to ensure comparisons are fair. In most cases Dinan Dyno numbers will be lower than those you will get at low RPM because of the inaccuracy at low RPM previously mentioned. Also in most cases Dinan's numbers will be higher at hi RPM because of the work we do to ensure proper heat exchanging that we find almost no one else does. A few years ago, we put together a really in-depth article on our dyno process and how even slight variables can affect the outcome of any test. http://dinancars.com/dinan-university/ - (Dynamometer Testing and The Modern BMW Engine) It's a long article, but it gives you a really detailed looks at the process with a conclusion that has a good breakdown of what we covered. The most accurate thing we can say is that we've observed over 36 years of tuning, with most models we've tested, that the drivetrain loss is between 6.5 and 15 percent. It’s not as simple as a percentage however, as it varies on car, transmission, RPM, vehicle speed and a myriad of other variables. The percentage listed in the last line is a bit off for the current generation of cars--- most of the modern RWD cars cap out at about a 13% drivetrain loss from what I have seen. On an AWD car that number is still in the 20% range however. |
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09-14-2016, 10:33 AM | #93 |
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Thanks. That linked article is outstanding. Not forgetting your perfectly sensible caveats, it seems from all this that we might see somewhere around 400 hp and 400 ft-lbs to the wheels of an M2 on the Big Turbo set-up. Little bit less if we are running 91 or 92, instead of 93 (Washington is 92, for example).
Not bad at all, I'd say... |
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09-15-2016, 05:47 AM | #94 | |
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retired: 2014 435xi|MPPK|335 bhp|3/5 stars |
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09-15-2016, 10:27 AM | #95 | |
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09-15-2016, 11:00 AM | #96 |
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No, that was a typo.
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09-15-2016, 11:36 AM | #97 |
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I just saw someone mounted 295 PSS rear on the stock rims FWIW.
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09-23-2016, 08:57 AM | #98 |
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Anybody with an M2 get the Dinan Exhaust installed yet? I'm weighing my options at this time. There are a bunch of options, but I can't seem to decide what I want. I am looking at a spring purchase, so I have some time to decide yet.
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09-23-2016, 09:18 AM | #99 |
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Is the Dinan S1 Tuner box compatible with MPE?
What are the gains using 91 octane?
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09-23-2016, 09:35 AM | #100 | |
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DINANTRONICS Stage 1 and the SPORT tuner are both compatible with MPE. Gains on 91 octane are minimal. If you only have access to 91 you probably will not see any real benefit to engine tuning until big turbos/fueling modifications are in play. |
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09-23-2016, 09:49 AM | #101 | ||
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Is 92 or 93 that much more octane? |
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09-23-2016, 10:39 AM | #102 |
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09-23-2016, 12:18 PM | #103 | |
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09-23-2016, 05:53 PM | #104 |
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09-23-2016, 06:09 PM | #105 | |
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Is octane ratings scale liner or logarithmic (like decibels), where a small change is significant? |
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09-23-2016, 06:29 PM | #106 |
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Depends on how the stock engine / mapping is calibrated. Some cars take additional octane much better then others as they have more base stock maps to choose from (or just a bigger gap in agressiveness). The car will automatically adjust to these internal maps based on timing so it can perform at as close to optimum as possible. Take the M4 as an example--- the difference between 91 and 93 on that car is actually pretty significant to the power (~15HP) whereas on a same year 335i its more like a 5HP difference. In general terms putting 100 octane fuel instead of 93 will usually net you 20+ WHP instantly with no other mods on the stock engine tune. Just simply because of octane.
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09-24-2016, 02:31 PM | #108 | |
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Stage 1 however addresses more inputs and in theory (debatable given the limited gains in the stage 1 form) would equate to better drivability (smoother power delivery, shifts, etc). The 2 bigger things would be the Stage 1 has the factory matching warranty and is upgradable down the road for when the intercooler and big turbo come out and will be able to take advantage of those hard parts. The sport unit would not be able to do that. Right now though its basically warranty. |
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09-24-2016, 02:56 PM | #109 |
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Stopped by the dealer today and while there I checked out the Dinan display. Not sure which model parts were on display but I will say the carbon fiber intake was very nice and the exhaust was made from nice thick and solid SS and the tips (not black) were larger than I thought and very nice!
Quality stuff! Last edited by omasou; 09-24-2016 at 03:05 PM.. |
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09-24-2016, 03:16 PM | #110 | |
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