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04-27-2022, 08:09 AM | #67 | |
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An accumulator is a very simple installation and relatively affordable. If you're doing this type of driving it's really a "might as well install one" type thing imo. It's true, a hiccup of air at the pickup tube isn't going to instantly seize an engine... but that sudden drop in pressure surely is doing damage over time and a $400 device can minimize that damage or even save your engine in the event of an oiling failure on track. Does everyone need one? No. Plenty of people track their cars for years without issue. But if you're willing to drop 10k in mods to make it a "race car" then this should be one of those mods lol. Check out this log: https://datazap.me/u/mkilgore/ncm-su...3447-3447-4470 And I have logged and posted similar logs. Timestamp 1474 he is back on throttle with rpm and boost rising over 3,000rpm (engine is loaded) and oil pressure is continuing to drop. I know on a dyno my n55 PWG car made as much as 507wtq on the stock turbo at 27xxrpm. He's not at 100% pedal input / load but still.... logs have captured oil pressure continuing to dip in a turn while the user is in a region of the oil pressure map that should be achieving 60psi+ and they are at 20-30psi. The issue isn't that "30psi is not enough oil pressure at 3,000rpm" because that SHOULD be plenty of oil pressure to be honest. The issue is that the oil pressure is supposed to be 60psi+ thus indicating that the 30psi the sensor is seeing is aerated oil thus indicating an oil pickup issue and thus resulting in significantly reduced load capacity of the oil film. 30psi of aerated oil is not the same as 30psi of air free oil. Also, oil pressure sensors have a resolution and logging has a resolution as well. The accusump will dump oil in between shifts indicating pressure dipped below the 60psi of the electronic switch I chose... but logs show 80psi still. To catch the "trough" of oil pressure in a momentary bit of starvation is not guaranteed just because you are logging. I know after logging hundreds of autocross runs I had a few logs showing as little as 10psi at 3000rpm. Just a matter of the sensor/log grabbing a datapoint at the exact moment of the lowest low. Just another consideration... TLDR: the problem could be even worse than a basic log would indicate. Last edited by bbnks2; 04-27-2022 at 12:32 PM.. |
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04-27-2022, 07:25 PM | #68 | |||
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04-27-2022, 09:03 PM | #69 | |
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Oil pressure dips were without the accumulator. With it I have not seen below 30-40psi. It smooths the dips pretty well. |
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AndyW697.00 |
04-27-2022, 10:42 PM | #70 |
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My experience is similar. This is why I copied your setup.
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Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune |
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05-09-2023, 05:07 PM | #71 |
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Does anyone know of a replacement 30 PSI normally closed switch I need to bump up the pressure a tiny bit on my accusump setup and my switch is bad anyway. Solenoid is still good I would just power it up all the time but I don't think the moroso setup can take continuous duty
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04-26-2024, 10:05 AM | #72 |
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Trying to decide between using a manual valve versus an EPC, and what the benefits are besides convenience. The EPC will allow discharge at a specific PSI (< 55PSI for discharge in the case of the 24-275X) while an open manual valve will constantly empty and refill based on the engine pressure to accusump pre-charge pressure ratio? So, using an EPC, the accumulator will fill above 60PSI, and since it won't release until below 55PSI, it can fill a larger volume, and with a larger fill volume the initial discharge rate will be faster. For example, with an EPC using a pre-charge of 10PSI and the engine hits 80PSI, the accumulator will fill and hold 2.63qt until discharge at 55PSI. Where as with an open manual valve, the useable volume in the accumulator with the same pre-charge is 2.45qt at 55PSI? So the benefit to the EPC is more oil discharge at a faster rate when open?
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04-26-2024, 11:10 AM | #73 |
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I've plotted it out here. I assume the EPC valve will immediately trend along the blue line once it's opened. Another thing to consider is that the EPC will not allow oil to refill the accumulator until 60PSI, where-as a manual valve will allow oil to trend along the blue line in discharge and recharge. I suppose the benefit of this is that engine oil pressure will be returned to 60PSI more quickly? Are there drawback to forcing excess oil into the engine and holding it there until 60PSI is reached?
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04-27-2024, 11:01 AM | #74 | |
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04-30-2024, 07:12 AM | #75 |
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I went with the electronic valve for the convenience of not having to constantly open and close a valve.
I believe race cars often run the manual valves because they are less restrictive. The electronic valve reduces the ID of the line but it's a marginal difference. |
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04-30-2024, 07:19 AM | #76 | |
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and yes, MHD logging is fast but nowhere near as fast as the cars computers are operating. I believe the OBD port is a limitation and the number of channels you try to log at the same time through the OBD port. There is onyl so much bandwidth available through that means of communication. Last edited by bbnks2; 04-30-2024 at 08:45 AM.. |
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