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BMW 3-Series (E90 E92) Forum
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+1mm Modified Intake Lift Valvetronic Supports- 'MILVs' N52
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02-14-2017, 03:27 PM | #89 | ||
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02-14-2017, 03:48 PM | #90 | |
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But yeah, future is looking quite good. I must have tested the RSA delete at least 50 times, and it worked perfectly. We've got 3-stage tunes for all the x28 variants (about as close to factory as you can get). And as you know, the only brick I had was because I fucked up the boot sector, and I recovered from that lol. |
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02-14-2017, 04:53 PM | #91 |
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Lol - haven't been up to speed on car stuff recently but am lurking from a distance. Thanks for the heads-up!
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02-15-2017, 04:36 PM | #94 |
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In the motor on the stand, not a running motor in car. That is the next step.
I am buying a 'new to me' commuter '07 328xi E90 81k auto this friday. My son and his 328 doesn't want to be the first. I should do a 'reward' for the first to test in a running engine and dyno. |
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02-15-2017, 04:47 PM | #95 | |
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02-16-2017, 03:58 AM | #96 | |
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I hope that helps explain. |
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03-09-2017, 11:00 AM | #97 |
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Just a little feedback on the shims - I've been working with somebody who's installed these to get it set up. No issues with anything (runs fine, nothing blew up), except the limitations of valvetronic itself. It did pick up a bit of mid-range, but not a significant amount - for reasons I'll detail below.
I don't know if you measured the lift increase with the eccentric shaft at full stop - but the reality is, it doesn't really pass 172-173 degrees. I'm working on that, but even if I can make it move the max value to say 175 or 177 degrees, it's still going to be less of an increase if you were measuring 0.5mm at 180 degrees. It might be worth re-thinking the design a little bit. Maybe it would be possible to target ~10.2-10.5mm at 175 degrees or something (although I haven't actually made the eccentric shaft move that far yet). I actually think even though BMW says the maximum lift is 9.9mm, in reality it doesn't go past 9.2-9.5mm. So that could be a 1mm increase (significant) over stock. With the current setup we saw some small gains at 0.2mm (my estimate), so I think there is potential with this - once we get it set up right. I'm going to continue working on the eccentric shaft issue and see what I can max it out at. Interestingly, if you disconnect the valvetronic motor it will go into limp mode, which moves the eccentric shaft all the way to the 180 degree stop (the only time it ever does so). Otherwise, if you log the values I can pretty much guarantee it doesn't move past 173. |
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03-09-2017, 11:25 AM | #98 | |
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If you remember, I unplugged my valvetronic motor and used an allen key to rotate the eccentric shaft motor / cam against the stops and recorded the values in INPA, 175.4 degrees was the recording I had at the physical stop. I never did get a tune to go above 173 degrees. The limp mode target is 180 degrees but it never achieves that value. |
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03-09-2017, 12:08 PM | #100 | |
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If it's a voltage signal, like 5v for 0° and 0V for 180° then it would follow that limp mode would be no signal back from the sensor, indicating a break or failure. |
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03-09-2017, 03:18 PM | #101 |
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I don't think it's a voltage signal, I think it's bit-encoded.
but yeah it will go into limp mode if you disconnect the sensor (which will cause the motor to run until the 180 degree stop). |
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03-10-2017, 07:32 AM | #102 |
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Glad to hear- " No issues with anything (runs fine, nothing blew up)"
I tried to be very conservative and safe for this initial mod. I can make it more aggressive but I was afraid it might affect idle lift and idle quality. I also have another mod version I can add to the current mod to also gain a bit more. Here are my measurements. The 'low' numbers are because the lifters are not pumped up. The valve lift gain actually starts at about 140* Ecc Cam position, and there is even some mid range valve lift gain from 100-140* EC position 140* Ecc Cam position - stock 7.122mm valve lift - modified 7.366mm valve lift +0.244mm 150* Ecc Cam position - stock 7.569mm valve lift - modified 8.103mm valve lift +0.534mm 160* Ecc Cam position - stock 8.103mm valve lift - modified 8.611mm valve lift +0.508mm 170* Ecc Cam position - stock 8.560mm valve lift - modified 9.093mm valve lift +0.533mm 174* Ecc Cam position - stock 8.712mm valve lift - modified 9.347mm valve lift +0.635mm Mid Range Ecc Cam position- 100* Ecc Cam position - stock 5.029mm valve lift - modified 5.156mm valve lift +0.127mm 110* Ecc Cam position - stock 5.663mm valve lift - modified 5.817mm valve lift +0.154mm 120* Ecc Cam position - stock 6.172mm valve lift - modified 6.426mm valve lift +0.254mm 130* Ecc Cam position - stock 6.655mm valve lift - modified 6.910mm valve lift +0.255mm Last edited by CobraMarty; 03-10-2017 at 07:47 AM.. |
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03-10-2017, 08:10 AM | #104 | |
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Have you measured the physical rotation limit on the cam? |
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03-10-2017, 08:13 AM | #105 | |
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03-10-2017, 08:19 AM | #106 |
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On my engine on the stand, I put a digital angle finder on the end of the EC. Zero'd it at closed/resting position on the stop and verified it at maximum rotation on the stop. I then turned the EC motor to get a angle reading at every 10* and measured the actual valve lift.
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03-10-2017, 08:22 AM | #107 | |
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03-10-2017, 08:49 AM | #108 |
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I still want these, but shit came up (New O2 sensors, and a new clutch and flywheel) so maybe I can wait for the second revision...if you plan on making one.
Also trying to source an OFT, so I can have Hass update my file. |
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03-10-2017, 12:10 PM | #109 |
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You don't need an OFT anymore. All you need is a ~$35 cable (not sure what BimmerGeeks is going to sell them for, but it has updated firmware) a Windows laptop, and WinKFP.
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03-10-2017, 12:19 PM | #110 | |
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If I need a new one, BimmerGeeks! I will buy it. |
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