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BMW 3-Series (E90 E92) Forum
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Review of JB3 1.22 (From Dinan Stage 2)
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01-16-2009, 03:21 PM | #23 |
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01-16-2009, 03:45 PM | #24 | |
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01-16-2009, 08:02 PM | #25 |
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So you think if you go back to Dinan, you'll still have their warranty? Do you effectively have the Dinan warranty and the power of a JB3? (for an extra $600 over the Dinan price)
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01-16-2009, 10:41 PM | #26 |
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sounds like you are really enjoying it!
I hope to get my installed soon but freezing temp with no garage would = bad install day. Please post some dyno pulls as soon as you get them done. =) |
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01-17-2009, 05:43 PM | #27 |
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The car is completely stock:
Just did a Dyno on 93 octane and pulled 348 which is better than the 324 on the Dinan and great versus the 285 stock. I don't know why the JB3 graph looks so jumpy compared to the stock and Dinan Stage 2? The only other observation I have is that the car is running a lot leaner than the Dinan Stage 2. It actually almost replicates the stock air/fuel curve that the car originally comes with (which is also a lot leaner than the Dinan). I don't know if this is on purpose or if it has to be this way in order to maintain diagnostic invisibility??? Any othe comments? |
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01-17-2009, 08:08 PM | #28 |
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Which rev was the Dinan tune in these results? Rev 1 or the detuned rev 2?
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01-17-2009, 08:27 PM | #29 |
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01-17-2009, 11:06 PM | #31 |
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Thanks for the dynos. Does the car feel jumpy? I don't like how lean it's running.
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01-18-2009, 12:42 AM | #32 |
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Smooth as butter...
I wonder how the air / fuel ranges are for the Procede and the other flash thats out there??? Almost all dynos I see do not include this part of the equation. Do keep in mind that it is almost identical to the stock a/f... Dinan doesn't have to be invisible so it can probably deviate from the fuel deliver parameters. It runs a lot richer for sure... There are also many real world aspects that don't show up on the dyno such as how much does each tune knock timming when driving hard for a prolonged amount of time, how rich is the mix up top and during gear shifts and how the a/f affects fuel economy in general. We need to keep exploring this... The tune really does feel very strong though. |
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01-18-2009, 06:10 PM | #33 | |
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The smoothing was also 3 vs 5 so that might have something to do with it as well... |
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01-30-2009, 07:19 PM | #35 |
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Thanks for the comparison graphs, Kelvin.
The Dinan tune runs richer than the JB3 and stock because it's necessary to run a richer mixture when increasing boost. As you increase cylinder pressure by adding boost, the mixture needs to be richened for a couple reasons. The first is to reduce detonation, a side effect of increased cylinder pressure. Incidentally, the reason why the JB3 power curve is so lumpy is because the knock control system is actively pulling timing back in order to save the engine from detonation. The second reason for a richer mixture is to reduce piston crown temperature and catalytic converter temperature to ensure long-term durability. Our tech article titled "Safety Strategies for a BMW Turbo Control System" is a good resource for more information: http://www.dinancars.com/bmw/technial-info |
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01-30-2009, 08:56 PM | #36 | |
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01-31-2009, 10:14 AM | #37 | |
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01-31-2009, 06:26 PM | #38 | |
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01-31-2009, 06:28 PM | #39 | |
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And once again, I have not said the JB3 is or is not controlling timing. I have said it doesn't do it through X or Y methods but have not ruled it out completely. More testing will be needed to make a conclusion. |
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01-31-2009, 06:52 PM | #40 | |
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01-31-2009, 07:00 PM | #41 | |
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Does that make sense? |
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01-31-2009, 07:12 PM | #42 |
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Yes it does, thanks for the explanation
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02-01-2009, 10:11 AM | #43 | |
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02-01-2009, 11:29 AM | #44 |
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But that suggestion would indicate a reliance on the stock ignition control system to adapt It shouldn't need to if timing is being actively controlled. I still want to beleive timing is actively being controlled but the more I have seen, it is getting more difficult to have faith in.
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