MS EBC Duty Cycle question - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-13-2014, 11:49 AM   #61
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I'm heading out for some more testing and tuning this afternoon. I've only gotten snippets of time over the last few days... Took tomorrow off to finish shrouding the FMIC and rad in, and also get CL working good and proper.

I'll let you know what I find out.
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Old 05-13-2014, 05:14 PM   #62
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Set the open and closed duty cycles back to default--didn't seem to do a damn thing.

P150 has me hit about 164 kpa with a boost target of 150. I then hold 164 +/- 2 kpa from 4300rpm to 5000rpm where it suddenly drops to WG pressure again.

So I guess 150 is pretty close for a P value for me.

---

In other news, why do I not hit 160kpa until 4300rpm with a GT2554R? I put my foot to WOT at 2300 and spooled from 2300 to 4300... should be quite a bit sooner, yes? I'll be ditching the cat tomorrow, I would imagine that would help, but I shouldn't need a hellaflow exhaust to spool quicker with this turbo, should I?

EDIT: been digging through the spool data thread... there's no way I should be spooling this slow. Doesn't make any sense. I know my WG isn't opening prematurely, because with my EBC set to OL at 100 I overboost to infinity.. I wonder if my cat is just melted to a glob in there and clogging everything up? Also not sure with sized FM exhaust the PO put on there, but even if it's the 2.25, I woudl think I could hit 8psi before 4300rpm with a gt2554r...

Last edited by mlev; 05-13-2014 at 05:36 PM.
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Old 05-13-2014, 05:42 PM   #63
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they aren't insta-spooling turbos, and with restrictive exhausts they can peak every slowly.
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Old 05-13-2014, 05:47 PM   #64
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Hell, now my O2 sensor decided it's just not going to read correctly. I swear, it's not even the tuning that is causing my issues, it's everything surrounding the tuning. Sensors, software, etc.

I did do some pulls with closed loop enabled and it seems to work fine, though I think the initial value table needs some tweaking. I didn't really get to tweak anything because I wanted to try and fix the O2 sensor situation. Also, the clutch is really not wanting to hold when the thing pulls to 10psi or greater so there isn't much point tuning the higher boost. The revs just go up and bleah.

I really don't want to do the clutch.
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Old 05-13-2014, 08:09 PM   #65
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I know there's no such thing as an instant spool turbo, but it takes literally 3 1/2 seconds from .01psi to 7psi and that's a damned long time with such a small turbo.

I'll work on freeing up my exhaust.
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Old 05-13-2014, 10:45 PM   #66
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Intake and exhaust. Anything on those sides will make a difference to spool up.
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Old 05-14-2014, 12:22 AM   #67
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K well my intake is about a 3" long 3" wide tube going to a K&N so I don't think there's much restriction there.
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Old 05-14-2014, 04:12 AM   #68
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Quote:
Originally Posted by mlev View Post
K well my intake is about a 3" long 3" wide tube going to a K&N so I don't think there's much restriction there.
On your boost duty table have you got it on 0 (wastgate) at lower rpm to allow it to spool quicker (no controlled leak) before you start the controlled leak at 2500 rpm?
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Old 05-14-2014, 10:18 AM   #69
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Quote:
Originally Posted by mlev View Post
K well my intake is about a 3" long 3" wide tube going to a K&N so I don't think there's much restriction there.
Was wondering. Then it's either your exhaust or how the wastegate is reacting (or not reacting) to the solenoid.
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Old 05-15-2014, 09:50 AM   #70
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Not excatly part of this topic: I have a '94 1.8 Miata with an MSM engine with MS1 Extra.
I have the stock RF4F boost sensor and Bp4Y boost solenoid and built the circuit for it MS1/Extra Hardware Manual.....

What would be approx the correct setting for it? Did anyone use the stock boost sensor and solenoid combination with MS? I know this could be leaking or bogging but I would give a shot for itand it came with the motor....
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Old 05-15-2014, 11:24 AM   #71
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Quote:
Originally Posted by HeresJohnny View Post
On your boost duty table have you got it on 0 (wastgate) at lower rpm to allow it to spool quicker (no controlled leak) before you start the controlled leak at 2500 rpm?
No duty table. This is CL. 0 (wastegate) would mean 100% controlled leak, not "no controlled leak". That being said, CL sets DC to 100 before you hit your target, so there's no leaking and 100% fast spool yes.

Quote:
Originally Posted by Harv View Post
Was wondering. Then it's either your exhaust or how the wastegate is reacting (or not reacting) to the solenoid.
The wastegate is reacting perfectly to the solinoid. I'm sure it's just my exhaust. It's the FM 2.25" exhaust. We made a race pipe for it yesterday and it spools faster, also hitting higher boost with the same P setting, so I'll need to dial in my PID now.


Quote:
Originally Posted by wolfblind View Post
Not excatly part of this topic: I have a '94 1.8 Miata with an MSM engine with MS1 Extra.
I have the stock RF4F boost sensor and Bp4Y boost solenoid and built the circuit for it MS1/Extra Hardware Manual.....

What would be approx the correct setting for it? Did anyone use the stock boost sensor and solenoid combination with MS? I know this could be leaking or bogging but I would give a shot for itand it came with the motor....
Approximate correct setting for what? Your boost controller? Open loop or closed? How much boost? Just get out there and tune it.
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Old 05-16-2014, 05:48 AM   #72
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Quote:
Originally Posted by mlev View Post
Approximate correct setting for what? Your boost controller? Open loop or closed? How much boost? Just get out there and tune it.
14psi, stock Ihi rhf5 turbo, open loop because of ms1, I meant the boost controller parameters:



I havent found any infos about the BP4Y solenoid and RF4F sensor, boost duty and kpa target obviously based on test/experiment...
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Old 05-16-2014, 02:59 PM   #73
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So, so what sorts of possible "setting issues" could I have?

I have P200 i0 d0 now, with a boost target of 150kpa that lands me right at 163ish before dropping back to wastegate. Sounds like it's just about right for my P. Except when I start bumping up my i value, I boost to about 175kpa. So add more P right? Well, tunerstudio won't let me. 200 is as high as it'll go.

I'm using the recommended settings from DIY for the diy solenoid (19.5hz and 20ms) but are there other settings I could try there that would effectively "raise" my P value and let me use a lower one?
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Old 05-16-2014, 03:13 PM   #74
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Found this little gem after pulling my hair out searching.

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Originally Posted by Braineack View Post
I'm done. MBC works better.
This is about how I'm feeling right now.
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Old 05-16-2014, 03:23 PM   #75
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19.5hz is not a recommended setting for that solenoid, it's the 30hz value.

if you have a boost target of 7psi, what the hell sort of pressure do you get at wastegate?

I still am going with you have the valve installed incorrectly and/or the settings setup incorrectly.

That post was when I was running MSI. I dont ever recommend MS1 or even Ms2. I LOVE CL boost control.
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Old 05-16-2014, 03:29 PM   #76
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From MegaSquirtPNP.com. Unless this is outdated (like everything else related to this ecu).

Quote:
NOTE-- while many EBC valves could be used, we recommend using the EBC solenoid available from DIYAutoTune.com. This is the valve we have tested with, and have setup the base maps to support by default.

When running boost control, you'll set up the basic parameters for the valve under the Boost Control screen in the Advanced menu. For our EBC solenoid, we recommend a frequency of 19.5 Hz and a control interval of 20 ms.
I really just need to build a damn ms3.
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Old 05-16-2014, 03:44 PM   #77
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try it at 30Hz. it might not be cycling fast enough to dump enough boost?
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Old 05-16-2014, 03:46 PM   #78
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Will do. And sorry if I seem snippish. I appreciate all the help and handholding. Just very frustrated there's no instruction manual for any of this.

I'd love to RTFM before asking questions, but there just isn't any manual out there that's actually up-to-date and accurate.

Seems like every time I think I found the answer someone tells me that source is wrong for some reason or another.
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Old 06-16-2014, 05:13 PM   #79
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Mlev, any further progress on your PID settings? Just took the plunge and ordered the solenoid myself, now after further reading it doesn't sound quite as simple to set up. Thus, curious if you got it working correctly, and if you were happy with the results?
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Old 06-16-2014, 05:16 PM   #80
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