Open Loop EBC + no variable TPS = Fail - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-15-2009, 11:24 PM   #1
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Default Open Loop EBC + no variable TPS = Fail

I just installed the DIYautotune EBC today and started tuning it. I was really excited, but that soon turned into disappointment. My target boost is 12PSI. If I actually tune for it in near steady state with 4th gear pulls, I will overboost like crazy in transients in lower gears. It's worse than an MBC, IMHO.

*sigh* When is MS going to get closed loop boost control?
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Old 02-15-2009, 11:29 PM   #2
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you need to tune the cells better, you need to use 4th or 5th gear pulls to determine the RPM you need to start opening the valve at.
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Old 02-15-2009, 11:58 PM   #3
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Problems solved.

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Old 02-16-2009, 12:06 AM   #4
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I struggled with EBC for a year and a half. Switched 2 weeks ago to an MBC and I'm never looking back.
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Old 02-16-2009, 09:58 AM   #5
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Sav, I am with you. I cannot seem to make it work either. I tried again this weekend to tune it to no avail. I did some 4th gear pulls from 2k, and the turbo actually spools slower with the EBC than with the MBC. I would change the spring in the waste gate, but I don't think that will solve the issue.
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Old 02-16-2009, 10:12 AM   #6
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I built the EBC circuit and bought the solenoid, but after two years I've never gotten around to installing it. My TurboXS MBC works just beautifully.

Here's a brief fifth gear pull, going up the sunshine skyway bridge. The log starts at fully closed throttle, as I wanted a good look at the boost threshold in my particular setup.

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Old 02-16-2009, 10:43 AM   #7
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I want a smaller turbo, I am convinced of that. I reach 188kpa at 4200.

I have a 42/.48 T3 that I can rebuild or I can get smaller 60/.48 T3. The one I have now is 60/.48 T3/4, and it is huge compared to the other T3's.
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Old 02-16-2009, 12:24 PM   #8
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We're running open loop on our red test car without a variable TPS, and it works fairly well other than that it doesn't compensate for altitude. Keith G is working on an easier to tune closed loop code that we plan to test out when it's ready.
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Old 02-16-2009, 01:18 PM   #9
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I dont have any problems....

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Old 02-16-2009, 04:32 PM   #10
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How do you get yours to show up in Vac/PSI and not KPA?
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Old 02-16-2009, 07:08 PM   #11
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Quote:
Originally Posted by miatamania View Post
How do you get yours to show up in Vac/PSI and not KPA?
Pick the option in MLV...

And BTW his shows MAP and Boost
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Old 02-16-2009, 07:52 PM   #12
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Hmm... maybe OL EBC + no variable TPS + me = fail.

Where are you guys getting your EBC boost signal? Mine's plumbed at the vacuum nipple just after the throttle plate. Maybe that's too noisy a signal?
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Old 02-16-2009, 08:04 PM   #13
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EBC sucks and everybody knows it. Get a MBC and dial it in and you'll be happy. T off your FPR line and use that to feed the MS it's vacuum supply and to feed the MBC.
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Old 02-16-2009, 09:32 PM   #14
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Quote:
Originally Posted by richyvrlimited View Post
Pick the option in MLV...

And BTW his shows MAP and Boost
Oh, never noticed it before. Good call.
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Old 02-17-2009, 09:53 AM   #15
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Quote:
Originally Posted by 96rdstr View Post
I want a smaller turbo, I am convinced of that. I reach 188kpa at 4200.
Yeah, as much as I thought I'd hate it early on, the TD04H-15G has proved to be a very nice little unit. Insta-spool at low RPMs, and yet it still works ok at higher RPMs, putting about ~13psi without making so much heat that the intercooler melts. The exhaust system has a lot to do with it, I expect.
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Old 02-17-2009, 10:09 AM   #16
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Quote:
Originally Posted by Joe Perez View Post
Yeah, as much as I thought I'd hate it early on, the TD04H-15G has proved to be a very nice little unit. Insta-spool at low RPMs, and yet it still works ok at higher RPMs, putting about ~13psi without making so much heat that the intercooler melts. The exhaust system has a lot to do with it, I expect.

Well, I have a .42/.48 Garrett T3 that I need to find a turbine housing for. The housing is cracked in multiple places on the exhaust side. I would like to stay with the T3 since my manifold is obviously set up for the T3. The T3 flange will need to be redone though as the current T3/4 5 bolt pattern is larger than the T3 I am thinking of installing.

The exhaust is restrictive. I don't run a cat, but I can image that 2.33 or whatever the size racing beat exhaust is doesn't help at all.

And.....I am still bummed about the EBC not helping the spool.
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Old 02-17-2009, 10:16 AM   #17
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it helped mine with a T3....


The biggest help with spool was my 3" exhaust and headwork however....


I almost never drive the miata without my laptop with me anymore, it's easy enough for me to change a few cells if the weather happens to be too cold and I overboost. In the least I have a switch to cut the EBC off and fail to wastegate, if one wanted, they could wire a MBC to fail to.

For the $5 I've invested into my EBC it works well enough for me. I maintain a perfectly flat boost level to redline, with my MBC it always spiked then tapered off a touch as seen above...
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Old 02-17-2009, 10:34 AM   #18
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My MBC doesn't spike at all. It is a Turbonetics MBC if that means anything, probably not though. Once the MBC level is met then it is nice and flat, only fluctuating from 188-189 kpa. The EBC does work, don't get me wrong. I have fiddled with it enough to know that it is working as it should when I set the parameters to limit boost to wastegate level. It is just that the EBC hasn't increased my spool like I was hoping it would. Once I get the new exhaust I will revisit the EBC again to see if it helps.
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Old 03-17-2009, 06:24 PM   #19
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It's final, EBC is out, just ordered my MBC.
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Old 03-17-2009, 07:17 PM   #20
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I just finished the mods to my MS board and didn't even bother with EBC.
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