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Old 11-08-2007, 05:21 PM   #1
KevlarSTi
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Question TGV Delete on 07 STi - Motor/Sensor Unit and CEL?

I did a search, but couldn't turn anything up - I have an 07 STi, and I know that, unlike the previous STi and WRXes which had separate motors and sensors, the 07 has these combined in one unit. I picked up some used OEM 07 STi TGVs and plan on deleting the valves and dividers from them before swapping them out for my stock TGVs, but it'll be a few weeks before I'm able to make it down to GA to get a tune, and I'd like to prevent any CELs in the mean time.

What I'm wondering is, if I just disconnected the motor/sensor units from the TGVs and zip-tied them somewhere out of the way, would that throw a CEL? What that would hinge on, I think, is whether the sensor simply measures the angle of rotation from the motor to tell the motor when to stop/start, or if there is some sort of physical stop within the TGV that prevents the plate from opening/closing past a certain point, and the sensor simply confirms this position or lack of movement. Does anyone have any knowledge about this matter?

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Old 11-08-2007, 06:21 PM   #2
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If you have a spare pair, why dont you just do your delete on the spares, then zip tie the intact units somewhere in the engine bay for now?
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Old 11-08-2007, 06:45 PM   #3
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Originally Posted by vision.dynamix View Post
If you have a spare pair, why dont you just do your delete on the spares, then zip tie the intact units somewhere in the engine bay for now?
That's what I said I'm doing (doing the delete on the spares, then pulling the original TGVs and putting the modded spares in). I'm just trying to figure out if zip tying the original motor/sensors somewhere in the engine bay will throw a CEL or not.
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Old 11-08-2007, 06:47 PM   #4
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Oh I thought you meant just the motors and sensors themselves.
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Old 11-08-2007, 06:56 PM   #5
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Oh, sorry, no, I misunderstood you, haha. You mean ziptie the entire TGV units somewhere in the engine bay? I'd rather not do that.. I'm not sure there's really anywhere good to put them, as those areas are pretty cramped, and moving them far from their original locations would require extending the wires, etc, which I'd rather not do if not necessary. I -do- mean zip-tying the motor/sensor unit somewhere near the original location (the motor/sensor is one unit).
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Old 11-08-2007, 09:03 PM   #6
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if you remove the sensors or motors from the stock location
you will get cel..
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Old 11-08-2007, 09:32 PM   #7
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Where'd you hear that from? Remember, the motor = sensors, it's an 07.
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Old 11-08-2007, 10:10 PM   #8
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Quote:
Originally Posted by KevlarSTi View Post
Where'd you hear that from? Remember, the motor = sensors, it's an 07.
Kevlar I second Jax's answer. My tuner will be deleting the CEL and once you do the deletes the ECU will go into a engine saving mode (forget the real name) it basically will limit your RPMs to like 4500 and cut your boost and open the WG duty so that it dumps all boost. So the answer is you will throw more than the cell you'll need a tune.
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Old 11-08-2007, 10:35 PM   #9
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Damn, that bad? That sucks...
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Old 11-08-2007, 10:41 PM   #10
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Kevlar I second Jax's answer. My tuner will be deleting the CEL and once you do the deletes the ECU will go into a engine saving mode (forget the real name) it basically will limit your RPMs to like 4500 and cut your boost and open the WG duty so that it dumps all boost. So the answer is you will throw more than the cell you'll need a tune.
Limp mode.
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Old 11-08-2007, 10:43 PM   #11
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Thats not bad just call and make an appointment for a tune the day after you do the deletes. I wouldn't drive it but to the tune after doing the deletes.
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Old 11-08-2007, 10:44 PM   #12
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Quote:
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Limp mode.
I have heard it called that many times but is that really the official term?
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Old 11-08-2007, 10:49 PM   #13
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It's a lot more complicated than "limp mode." There is an array of fail safes, even if different failure conditions (like, coolant temperature sensor failure vs MAF sensor failure) can trigger some of the same fail safes. There is some overlap and some unique fail safes for given failures.

Disabling ignition advance is common. You can read the Subaru manuals. They have very detailed information.
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Old 11-08-2007, 11:02 PM   #14
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Quote:
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Thats not bad just call and make an appointment for a tune the day after you do the deletes. I wouldn't drive it but to the tune after doing the deletes.
Yeah, well, the problem is, I live in NC, and I'm getting it tuned in GA (at TopSpeed). That's a 6 hour drive...

So is there anything I can do so it -doesn't- go into limp mode?

Would somehow leaving my stock TGV units connected off to the side actually work? (As un-ideal as that is).
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Old 11-08-2007, 11:10 PM   #15
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Quote:
Originally Posted by KevlarSTi View Post
Would somehow leaving my stock TGV units connected off to the side actually work? (As un-ideal as that is).
I dont see why it wouldnt.
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Old 11-09-2007, 12:22 AM   #16
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No it wouldnt work because the sensors are suppose to stop at a certain point (when the butterflies close or open). Setting them to the side leaves it no stopping point whether opened or closed.

TGV deletes arent worth it, IMO. If I could do it all over again, I wouldn't have wasted my time or money on it. The only reason I did it was I got a kickass deal on a deleted set, was going to install some Hondata tgv gasket spacers and install an APS turbo inlet.

I'm not sure if there are additional TGV CELs for the 07 but my 04 tripped off 4 codes when I removed the motors and sensors: P1086, P1088, P1094, P1096.
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Old 11-09-2007, 01:23 AM   #17
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I mean setting my entire stock TGVs to the side (the actual TGV units, with the motor/sensors attached).

The reason I'm doing TGV deletes is I'm also installing an APS turbo inlet and Grimmspeed phenolic spacers, so I have to pull the intake manifold anyway. I figure I can sell my stock TGVs for what I got the replacements for, so it's essentially a free mod (minus my own labor).

Thanks to everyone for the help.
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Old 11-09-2007, 01:25 AM   #18
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Once the car is at operating temp, you can stop and restart it and it will take it out of limp mode.


Quote:
Originally Posted by KevlarSTi View Post
So is there anything I can do so it -doesn't- go into limp mode?
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Old 11-09-2007, 01:59 AM   #19
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pm sent.
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Old 11-29-2007, 02:00 PM   #20
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can you pm this also im doing same thing!
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Old 11-29-2007, 04:35 PM   #21
KevlarSTi
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He sent me a PM asking about buying my original TGV's after I swap them out and port/delete them as well. I'll post my results once I actually try something...
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Old 11-29-2007, 04:48 PM   #22
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yep. so kevlar any updates for me?
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Old 11-29-2007, 05:21 PM   #23
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open ecu flash just eliminating the codes also works. I have done it an 02 wrx with a utec and an 07 sti that is using open ECU.
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Old 11-30-2007, 01:21 AM   #24
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agreed, dont worry about leaving the sensor/motor in the engine bay, just turn the cel off.

another question though, when you disable the trouble code via enginuity is it just turning off the light or is it making the ecu think that things are fine and dandy? does this really put the car into limp mode cause my car has run quite well with a tgv delete and disabling the code in enginuity.
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Old 11-30-2007, 02:01 AM   #25
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Yeah, but the problem with that is, I have a Cobb AP, and when I asked Cobb about this, they said that if I used Enginuity to remove the codes, it would 'unmarry' the AP, effectively, making me unable to reflash with the AP at all.

Splat: The TGV's I deleted/ported are ready to go in, I'm just waiting for a few more parts to arrive so I can do a big install at once. Then I'll port my stockers and shoot you a PM.
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