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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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05-14-2013, 11:59 PM | #1 |
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Stock Direct Injection PSI
I've done some searching and haven't come up with anything (apologies if it was mentioned somewhere else already, I did search for a good 20 minutes here and on google), so figured I'd start a new thread.
Has anyone been logging the PSI on the HPF system? I've been seeing some strange numbers, and want to compare against a different logging solution. I'm using a DashHawk with custom PIDs entered in. Fuel PSI is hitting 3k at WOT at times according to my logs, curious if anyone else has been paying attention/noticed similar results or if my logs are just bunk. Attached the logs if anyone cares to look. Nothing exciting, just a few 2nd/3rd gear rolling pulls. |
05-15-2013, 08:42 PM | #2 | |
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For reference, Diesel engines have used Direct Injection exclusively for years. Diesels have compression ratio's on average anywhere between 16:1 and 25:1 (vs. the 86's 12.5:1) and Diesel direct injection systems often operate at 25,000psi or more on the bigger commercial diesels.
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05-15-2013, 08:45 PM | #3 | |
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05-15-2013, 08:48 PM | #4 | |
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05-15-2013, 08:49 PM | #5 |
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05-15-2013, 09:28 PM | #6 |
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I've seen 3K pressure too.
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05-15-2013, 10:04 PM | #7 | |
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Diesels are different because they don't inject fuel then ignite it, the two processes happen simultaneously so the diesel injector has to be able to supply fuel at maximum cylinder pressure which is much higher than even the pressure at the end of the compression cycle. The high pressure is not only because you need to get the fuel straight into the cylinder instead of just pump a bunch into the intake tract (which has more room), but also because the shorter amount of time the fuel has to mix with the air means you want it to vaporize more quickly. Aside from less heat soaking into the fuel from the valve and head, another benefit is having fuel go straight to the piston, so that less ends up on the cylinder walls, the piston gets a little cooling, and more fuel is concentrated around the spark plug. |
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05-16-2013, 10:23 AM | #8 |
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The Mazdaspeed 3 engine could be considered an early generation GDI system. It uses swirl injectors. Newer GDI runs up to about 20MPa, similar to what OP is seeing (3000psi=almost 21MPa).
The current generation diesels run up to 180-200Mpa. The newest systems coming out are about 250-300MPa. |
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05-16-2013, 03:27 PM | #9 | |
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Thanks everyone for the info, looks like my data is accurate so I can move forward. |
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05-16-2013, 05:11 PM | #10 | |
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Also, DH seems to be working on the 86? Maybe I won't sell it when I part out after all... |
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05-16-2013, 05:30 PM | #11 |
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I was using the torque pro app to monitor the pressure of the high pressure rail from the ECU. At idle i was getting around 750, light load was about 1500 and high load floated around 1900. But i stopped mentally tracking it a while back, dunno if my memory is accurate.
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05-16-2013, 06:11 PM | #12 | |
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In reality it's around 1900+, but it'll hit 2k. DH seems to work just fine. Lots of stuff it monitors. Although when the DI turns off, it gets very confused and the fuel rail pressure just keeps counting up. I also noticed a slight discrepancy between the digital speedo in the dash and the DH speedo, but I'm not too worried about it. |
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05-16-2013, 06:36 PM | #13 |
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Do you run KMD pumps then?
I also see ~3k in my logs for the FA20's I have logged. Also noticing the creeping of rail pressure while DI is off. |
05-16-2013, 07:09 PM | #14 | |
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