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Old 04-21-2006, 11:33 PM   #1
gaby
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Default OPEN/CLOSED LOOP BOOST CONTROL?(pics)

I just installed my TMIC, 18g and pink injectors, so I had to download Stage4 parameters. The parameters had cosed loop boost maps. With my set up I was boosting 18psi with closed Boost map of 400. With open Boost map of 80 I was boosting 18.1psi more spiky Though. Has anyone try the diference between open/closed boost control?

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Old 04-21-2006, 11:50 PM   #2
NavyBlueSubaru
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Open loop is generally more consistant. What turbo is that on the left?

Jeff
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Old 04-22-2006, 12:10 AM   #3
gaby
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Left OEM WRX Right Turbochargers.com 18G.
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Old 04-22-2006, 12:14 AM   #4
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Exhaust side compare


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Old 04-22-2006, 09:38 AM   #5
NavyBlueSubaru
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Its just that the compressor side doesnt really look any bigger in that photo. I know when I got my big 16g, the size difference was extremely obvious. The exhaust side pics show the diff. a little more though.

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Old 04-22-2006, 09:09 PM   #6
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Quote:
Originally Posted by NavyBlueSubaru
Open loop is generally more consistant.
Really? I've never seen any data to say either is better than the other. By definition open loop should be subject to more variation than closed loop. Care to further explain your position?
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Old 04-22-2006, 09:45 PM   #7
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Err, no way. Use closed loop... It will be more consistent. Open loop you just set your boost control solenoid duty cycle. Whatever boost that happens to make, there you are. You could make different boost level every day of the week.

I don't think anyone uses open loop on a UTEC these days. I wouldn't touch it. Maybe in certain circumstances (like a drag-only car) it might make sense.
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Old 04-23-2006, 06:17 AM   #8
gaby
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I think is a normal 16g t05 compresor with a 18g clip. It was easier to set the open loop, why will it change the boost every day?
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Old 04-23-2006, 12:52 PM   #9
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What 18g is it, Deadbolt or FP or other?

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Old 04-23-2006, 02:25 PM   #10
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Read the thread Jeff

He said its a Turbochargers.com 18G and I also asked a question, if you could scroll up and answer it I'd appreciate it, thanks.
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Old 04-23-2006, 06:01 PM   #11
gaby
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It is an 18g from turbochargers.com( I am very happy with it). Deathbolt got the same one bot is ceramic coated, Forceperformence do have the same one. It uses the same compresor(t05) from the big 16g. I get 19psi(tha's what Im runing) at 3900rpms, 15 psi at 3500rpm and I haven't dynno tunned it yet. I maxxed out my oem injector at 9psi400rpms with this baby and the pinks are running 83% at 10:1afr. It really put some cfms on my car.
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Old 04-29-2006, 04:18 PM   #12
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update : Im using the closed loop option a it reduced the spike and gain lower end boost.
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Old 04-29-2006, 06:00 PM   #13
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sorry, i didnt catch it earlier.

Jeff
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