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Old 12-28-2010, 01:20 PM   #26
JeromeS13
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Is this correct on the 2008 STI? I'm looking in ATR, and the current multiplier is 514.20 and the offset is -293.00. Are these the same units of measurement? Doesn't seem right to me...



Quote:
Originally Posted by Demon2003 View Post
4 BAR
Multiplier = 11.97 psia/V
Offset = +0.506 psia

3 BAR
Multiplier = 9.119 psia/V
Offset = +0.164 psia

Big thanks to MRF582 on RR for the information
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Old 12-28-2010, 01:30 PM   #27
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Disregard. Found the information that I needed. Perrin has all of the information on their website, for all of the tuning options.
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Old 03-07-2011, 11:59 AM   #28
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Quote:
Originally Posted by imppu2001wrx View Post
Yesterday I tested this omni power 3bar map sensor in my car. I zeroed out the offset. It worked nicely on 16 bit but the high idle was the reason I took it off. In my case the high idle was 1300rpm.

So question is what is causing this high idle? Otherwise it looks like you could use omni map on 16 bit. Manifold pressure direct was almost the same as stock with zero offset. Very small difference.
Quote:
Originally Posted by fastblueufo View Post
Is the ground wire from the map tied in with the ground from the iacv? They are in the same part of the harness. Maybe the omni is causing electrical interferance with the ground on the iacv if they are tied in together.
Did you guys figure this out?
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Old 03-07-2011, 12:33 PM   #29
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Quote:
Originally Posted by JeromeS13 View Post
Disregard. Found the information that I needed. Perrin has all of the information on their website, for all of the tuning options.
useless without a link..
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Old 03-17-2011, 07:44 PM   #30
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Quote:
Originally Posted by thefoos View Post
Did you guys figure this out?
I'd like to know as well- I just got my 4 bar omni power delivered today and I don't really want a 1300rpm idle either...I bought the map sensor from Perrin and they say it's compatible with 02-07 wrxs but don't mention anything about a high idle. Any insight would be very appreciated!
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Old 03-18-2011, 02:02 AM   #31
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Quote:
Originally Posted by thefoos View Post
Did you guys figure this out?
I sold my omni power map sensor..
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Old 03-30-2011, 08:27 PM   #32
atvracer111
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Map sensor cal info from Perrin site...

http://www.perrinperformance.com/sha...mapsti4bar.pdf
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Old 03-31-2011, 07:41 AM   #33
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Unless you install this on an sti it won't work. On the wrx it causes a high idle. I havnt looked at a wireing diagram yet but I suspect the map sensor is tied in with the iacv. If you have a wrx (16 bit ecu) I would go with the AEM sensor. Its a higher quality piece imo. Can't beat the stainless body...
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Old 03-31-2011, 07:30 PM   #34
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I looked and the map sensor is tied in with the iacv with the voltage and ground wires. Also the tgv sensors and the coolant temp sensor.
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Old 03-31-2011, 08:03 PM   #35
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^Thanks for the info, looks like I'm just going to sell my omni 4 bar before even taking it out of the bag, unless perrin will let me return it.

Last edited by Rez1138; 03-31-2011 at 08:35 PM.
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Old 04-01-2011, 01:32 PM   #36
atvracer111
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Rez...I would try installing it and adjusting your map to see if your car does the samething as mentioned above with the 3bar. I just installed the 4bar on my STI and had to adjust for the CEL voltage and offset and everything worked fine..when i had the omni 3bar on the my STI I had a wierd idle and I even tried the 3bar on a buddies STI and he also had a wierd idle once it was installed. But the 4bar on the STI does not have the wierd idle issue for some reason.
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Old 04-01-2011, 02:08 PM   #37
fastblueufo
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Quote:
Originally Posted by atvracer111 View Post
Rez...I would try installing it and adjusting your map to see if your car does the samething as mentioned above with the 3bar. I just installed the 4bar on my STI and had to adjust for the CEL voltage and offset and everything worked fine..when i had the omni 3bar on the my STI I had a wierd idle and I even tried the 3bar on a buddies STI and he also had a wierd idle once it was installed. But the 4bar on the STI does not have the wierd idle issue for some reason.
I think you need to read the whole thread. None of the sti have had a problem with the omni power. Only the older wrx's with a 16 bit ecu have the idle problem. It is mechanical and not a problem with tuning.
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Old 04-01-2011, 03:02 PM   #38
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Quote:
Originally Posted by fastblueufo View Post
I think you need to read the whole thread. None of the sti have had a problem with the omni power. Only the older wrx's with a 16 bit ecu have the idle problem. It is mechanical and not a problem with tuning.
I did read the whole thread I was just making a suggestion since my 08 STI had an idle issue with the Omni 3Bar with adjustments made to the map for the 3bar sensor and did not have the idle issue when i installed the 4Bar and made the map adjustments.

WAR EAGLE!!!!
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Old 04-01-2011, 03:45 PM   #39
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If perrin doesn't let me do a return on it I may install it just for the hell of it to see for myself. I have a tactrix cable so reflashing isn't an issue. If I'm going to have to resell it I don't think I will get a much better price if it's still in the original bag or not.
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Old 04-01-2011, 07:18 PM   #40
fastblueufo
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Quote:
Originally Posted by atvracer111 View Post
I did read the whole thread I was just making a suggestion since my 08 STI had an idle issue with the Omni 3Bar with adjustments made to the map for the 3bar sensor and did not have the idle issue when i installed the 4Bar and made the map adjustments.

WAR EAGLE!!!!
Auburn Sux!!!! LOL
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Old 04-18-2011, 09:20 PM   #41
Rez1138
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I finally got around to installing my omni power 4 bar map sensor today- I would have done it earlier but I couldn't get the map sensor off without first taking of the IACV, and I knew I was going to need a new gasket for that...so the gasket came in the other day and I installed the new sensor and reflashed today and I am having the same high idle that the other guys have mentioned, but it doesn't affect me as badly because of my trusty 4EAT trans. When I just start up the car the idle is around 1500, but when I put it in gear the idle is around 900rpms- I can live with that.

I'm running 23psi currently and I'm planning on bumping it up slowly (checking learning view after runs and keeping an eye on a/f gauge) to about 26psi, I'll post more if I run into any issues.
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Old 05-06-2011, 11:13 AM   #42
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Quote:
Originally Posted by adeliciouspizza View Post
I am running a 4 bar Omni. When I first put it on it was throwing codes. Turns out the Omni runs a lower "minimum voltage" than the stock sensor. The stock ecu programming will throw a code below .25 volts or so (check a stock rom to see what I mean). I changed it to .05 volts and re-flashed and I haven't had a single problem with it after that. It reads spot on with my boost gauge using the calibration posted above.
good info. I am getting a p0107 code excited to try this out to see if it works
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Old 05-06-2011, 12:34 PM   #43
the suicidal eggroll
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Quote:
Originally Posted by Demon2003 View Post
4 BAR
Multiplier = 11.97 psia/V
Offset = +0.506 psia
Quote:
Originally Posted by atvracer111 View Post
Map sensor cal info from Perrin site...

http://www.perrinperformance.com/sha...mapsti4bar.pdf
Hmmm...so which is it?
11.97 psia/V with .506 psia offset, or
12.087 psia/V with .168 psia offset
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Old 05-11-2011, 01:02 PM   #44
the suicidal eggroll
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Quote:
Originally Posted by the suicidal eggroll View Post
Hmmm...so which is it?
11.97 psia/V with .506 psia offset, or
12.087 psia/V with .168 psia offset
Looks like the confusion stems from Omni themselves....yay

http://omnipowerusa.com/calibrations.doc

They have two equations in there:
Code:
(Vout x 1.00878)/.002421/5=KPA
Which, when simplified, comes out to:
12.087 psia/V with 0 psia offset

And:
Code:
Vout = 5 X (.002421 X P[kPa] - .00842)
Which, when simplified, comes out to:
11.982 psia/V with .504 psia offset

Obviously there's a mistake in one of those equations, I'm inclined to believe the mistake is in the first one since there's no offset given, so I'll be going with the latter.
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Old 05-13-2011, 11:11 PM   #45
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I have the omni 3 bar. I can't get my car to start when I put in the 9.119 and .164 offset. If I put in the stock values and just change to .05 sensor limit the car will start but idles high around 1500 or until the car warms up. What could I possibly be doing wrong? I sure would like to read my boost beyond 24.38in my logs
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Old 05-14-2011, 08:59 AM   #46
jaxscuby
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Quote:
Originally Posted by the suicidal eggroll View Post
Code:
Vout = 5 X (.002421 X P[kPa] - .00842)
Which, when simplified, comes out to:
11.982 psia/V with .504 psia offset

Obviously there's a mistake in one of those equations, I'm inclined to believe the mistake is in the first one since there's no offset given, so I'll be going with the latter.
well i tried this one and no luck starting the car.
ran out of light, just the stocker back in for now.
will try the other equation later in the week.
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Old 05-18-2011, 01:53 AM   #47
the suicidal eggroll
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Quote:
Originally Posted by jaxscuby View Post
well i tried this one and no luck starting the car.
ran out of light, just the stocker back in for now.
will try the other equation later in the week.
Same here
Just tried to start my car for the first time in 2 months today after overhauling the fuel system. While the car was down I went ahead and installed the Omni 4 bar as well. Tried to start it up, no dice. I swapped in the OEM map sensor and switched to the stock scaling and it fired up on the first try.

I'll try the Perrin scaling next.
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Old 05-21-2011, 07:54 PM   #48
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I'm wondering if both the 4bar and the 3bar scaling are off from omni. If I use the stock scaling the omni starts right up. I have to lower the cel voltage to .05 or it throws a cel. Not PnP
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Old 06-02-2011, 09:20 PM   #49
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Omni is awesome. I called and talked to them about scaling the 3bar and after a long conversation I know own a 4 bar, put in the Perrin values and teh car fires right up. I will be doing some logging to see how it works
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Old 06-03-2011, 11:40 AM   #50
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Ok, now I am confused. I did some logs and it's only hitting 24.38 which is what it would max out on with the stock MAP. I just checked my ROM and it has the Perrin values. I turned my boost up a few twists on my hybrid boost controller and it's still hitting 24.38. We all know that can't be right. What could I possibly be doing wrong?
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