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JB4 CPS offset dyno testing and logs
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03-22-2011, 09:23 AM | #1 | |
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JB4 CPS offset dyno testing and logs
Some data and commentary from BMS you guys might be interested in as this was a topic covered a lot over the last few weeks. I haven't seen data like this presented before and find it very interesting.
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03-22-2011, 09:39 AM | #2 |
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Imo you guys are applying the offset wrong that's why you.are killing the power. Notice how map 1 looked smooth with the offset and made similar power to map 2. I would personally start at 6 degrees offset and ramp down to 3-4 for map two.
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03-22-2011, 09:48 AM | #3 |
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Why did you choose to dyno first with no cps, then with cps as opposed to first with cps, then without? Wouldn't after many dyno pulls the car would be more likely to drop timing, giving the no cps offset the biggest advantage?
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03-22-2011, 10:58 AM | #7 |
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Cool data. The drops at the top are interesting... especially with the increased offset. There is a couple boost spikes and maybe dyno environment wasn't so great. IAT doesn't seem to be rising until the 60% cps graph though.
There is definitely a relationship between boost and timing. The reduced timing curve is important in reducing chance of knock, BUT also in reducing the advance slope which will reduce the frequency of knock events. FYI: any sudden drop is NOT a VANOS event... timing due to VANOS shift happens over 1000rpm about 3deg gradually |
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03-22-2011, 11:00 AM | #8 |
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03-22-2011, 11:07 AM | #9 |
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Good call didnt even think of that. I'm used to cars with torque near redline
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03-22-2011, 11:24 AM | #11 |
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03-22-2011, 11:33 AM | #12 |
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Yes, I was being nice. I know quite a few people in the "Industry" and they all just shake their heads at the notion about timing control (or lack thereof). They can't believe people are that gullible (I'm being nice again).
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03-22-2011, 11:33 AM | #13 | |
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Any guesses on how "powerful" this dyno run was? Note smooth negative timing the entire run... Mike |
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03-22-2011, 11:36 AM | #14 |
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That run probably looked like dog shit as you are affecting injection timing and a bunch of other things. You have a lot to learn in regards to how to correctly apply this useless feature.
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03-22-2011, 11:38 AM | #15 | |
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Mike |
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03-22-2011, 11:45 AM | #17 |
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+1 (and I never do this)
Last edited by usc335; 03-22-2011 at 12:42 PM.. |
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03-22-2011, 11:55 AM | #18 | |
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Also the runs with the most "knock" according to "e90post pro tuners" proved to be the smoothest and most powerful on the dyno. Hmmm. Mike |
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03-22-2011, 11:56 AM | #19 | |
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03-22-2011, 11:57 AM | #20 | |
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It can easily be verified on a dragstrip that a cooler engine will yield more hp, holding all else equal.
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Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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03-22-2011, 12:00 PM | #21 | |
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03-22-2011, 12:04 PM | #22 |
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Clap are you saying that this is in some way a more crude application of CPS offset than what procede did in v5 prior to dynamic ignition timing release (current)? Personally wouldn't think so as procede would apply a static CPS offset prior to DIC, no? Exception being boost was being auto-tuned as well
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