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08-14-2014, 09:45 PM | #1 |
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N20 Oil Pressure
Not sure how many others are tracking their BMW's with the N20, but figured I'd share some of my findings as it relates to oil pressure. I track my Z4 pretty heavily and in July had a bit of a surprise when running the Pocono Southeast course during MPACT when the car threw several codes related to intake and exhaust camshaft / crankshaft correlation faults. These codes are sets when the camshaft is not in the correct position due to a timing issue. The most common cause is a problem with the VANOS system. Since I hadn't seen these errors thrown previously, I decided to clear them and see if they reappeared under normal driving conditions (which they did not). This let me to believe that the most likely cause was a drop in oil pressure which caused the VANOS solenoids to be "late" vs what the DME had expected. Also, given that Pocono Southeast is comprised of mostly left turns unlike just about every other track in the Northeast, it seemed plausible that the root of the problem was caused by not enough oil in the pan at the pickup location while hard left hand cornering.
Since Pocono, I fitted an oil pressure sensor to the N20 and wired it up to my AIM MXL data logger. Then took the car out for a bit of testing at NJMP Thunderbolt to see if I could confirm my theory. I've attached images of the oil pressure sensor install (which is actually in the same location where BMW would have put a sensor in the oil filter assembly) along with screenshots of the AIM analysis measures and plots. The first is x/y plot is oil pressure vs lateral acceleration (negative numbers are left turns), second is oil pressure vs longitudinal acceleration (negative numbers are braking) and the third is oil pressure vs RPM. These show oil pressure dropping off when either heavy breaking or turning left, I think it's coincidental that rpm's also happen to be below 3500 at the same time. I'm not overly concerned about this as the number of samples below the 1.5 bar minimum operating oil pressure is rather low, but still planning on a solution for late November. I'll be working with a vendor that fabricates a good number of parts for BMW's on creating an oil pan baffle for the N20. The biggest challenge I think will be the fact that on non-Xdrive cars the oil pan is actually plastic, but hoping they can come up with something that will work without having to go through the effort (and expense) of manufacturing aluminum oil pans. With any luck once the prototype is fitted and tested in my car, they will start offering them for sale to anyone else who might be interested.
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08-15-2014, 11:09 AM | #2 |
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Thanks for sharing that tech with the rest of the community.
Great patience overcoming the E89 platform strong bias as a "street" car Do you top off the oil before you track the car? |
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08-15-2014, 02:23 PM | #3 |
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Thanks. Yes, oil is always topped off before hitting the track.
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08-17-2014, 02:01 AM | #4 |
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Good luck with new baffle development. Should be doable to epoxy in place.
Our N54 has a $200 solution already that must be spot welded n place.http://store.vacmotorsports.com/vac-...n54-p1435.aspx I found a great read on your N20 oil supply beginning on page 65 of tech training manual. Assumimg you have this.
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PM for various e89 parts 4sale. Last edited by z4z4z4; 02-04-2015 at 01:38 AM.. |
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08-17-2014, 09:38 PM | #5 |
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Cool stuff. Tracking without a baffle makes me nervous. I am surprised that BMW does not put them in any cars, even the M cars. I understand that they might not want to incur the costs of using a dry sump, but installing a baffle would seem to be a pretty easy thing to do at the factory.
Adding an oil pan baffle is on the list of things to do for my M3 if I get into more frequent tracking. Good luck on developing one for the N20! I hope it goes well. |
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08-19-2014, 11:05 AM | #6 | |
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08-19-2014, 11:21 AM | #7 |
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all my testing on the N20 has been on street tires (Bridgestone RE-11s). Can't speak to the M3 though.
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08-19-2014, 12:41 PM | #8 |
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I think R comps definitely make it easier to achieve the lateral G forces that would cause starvation, but as wmandra indicated, loss of oil pressure is possible with street tires. But I will not run R comps without a baffle. Bummer that you have to drop the front subframe to swap out the oil pan.
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08-19-2014, 02:17 PM | #9 | |
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I wonder if adding baffles to a street tire car is sort of solving for a problem that isn't quite there.... i.e. tracking the car with stock oil pan, if the used oil analysis is fine, is there really an issue? I get that is cost isn't an issue, then why not, but for a more "budget" enthusiast, should baffles be at the top of the spend list? |
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09-13-2014, 09:42 AM | #10 | |
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09-13-2014, 08:30 PM | #11 | |
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I've been getting up to speed on the C6 Z06 lately, and even with the dry sump oil system there are still issues on the 2006 to 2008 cars, and there are issues with the exhaust valve guides from the factory that have cost engines there as well. Seems like oiling is always going to be a key concern |
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12-12-2014, 09:26 AM | #12 |
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Just a quick update on this... Had the car over at VAC to drop the oil pan and see what could be done for a baffle. Unfortunately the tolerances inside the pan are just too tight. The pan is essentially molded around the oil pump and has a small sump / recess in the bottom for the pickup. So it doesn't look like a baffle solution will be possible. New plan is to install an Accusump system into the car in the next few months with an electronic pressure control valve that will open in the 20-25 psi range (which is just below idle).
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04-14-2016, 03:02 PM | #13 | |
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I was wondering if you had the accusump installed. I own a 220i (I am from belgium) and have a BR performance remap. Now, I had an oiling problem in my engine. New engine is getting installed as we speek. Now because I like to get the car on track a couple of days and I love do drift, I want to make some safety mods. Baffles aren't an option as you already know. I mailed Canton Racing to ask them what product I need to prevent getting engine damage. I would like a system that injects extra oil when the pressure gets low. (But before its gets to low) This way damage can be prevented. They asked me if I could give them oil pressure stats, so that they can give me the correct product. 1idle oil pressure. 2maximum oil pressure. 3oil pressure the car sees on track. Now, because The car is not operational to drive at the moment, I was hoping you could give me those oil pressure stats. Because it's the same N20 engine and you seem to track the car a whole lot. Hope you can help me! Thanks! Regards, Aiko. |
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05-09-2016, 03:54 PM | #14 |
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I am interested of getting Accusump too. My engine just blew when I was at Spring mountain motorsport ranch, and I was using R COMPOUND TIRES. Have you gotten it installed yet?
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09-21-2017, 03:37 PM | #15 | |
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09-21-2017, 10:03 PM | #16 | |
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Question: It looks like you put your oil pressure gauge sender where the factory oil temp sender is mounted. Where did you put the factory oil temp sender? |
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