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Old 04-30-2011, 02:14 PM   #26
seanathanq83
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I will see if I can order one at work and get some pics
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Old 04-30-2011, 06:50 PM   #27
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Ok well the sti Cam sensor is special order, so I can't get one in, but I have a friend That may have one I will look, the wrx one though looks pretty close to the jdm one from what I remember
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Old 05-02-2011, 10:48 AM   #28
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I figure that subaru would have simply used the same sensor as they use for the cam pulley trigger sensor except with a plug change.
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Old 05-02-2011, 10:53 AM   #29
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well i dont understant why sti need 3 pins, they just read negative, as where jdm read positive
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Old 05-02-2011, 11:45 AM   #30
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JDM sensors they are magnetic type (sin wave) and the USDM AVCS is hall effect (square wave).

Magnetic is what's used on normal cam gear sensors on Subaru cars.
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Old 05-02-2011, 12:11 PM   #31
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Just talking about USDM models, for the STi they use one of each for the crank or the cam sensor I'm just not sure which one is a reluctor type and the other is a hall effect. On the WRX they are both reluctor type. The trigger for the actual cam position on the end of the cam itself is also different between USDM and JDM cams so unless you have an aftermarket ECU or JDM ECU you will run into trouble making the JDM cams work with AVCS
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Old 05-02-2011, 12:14 PM   #32
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Quote:
Originally Posted by seanathanq83 View Post
well i dont understant why sti need 3 pins, they just read negative, as where jdm read positive
Reluctor sensors usually require 3 wires, hall effect only need two. The positive or negative triggering are when the ecu counts the pulse on the rising edge or falling edge of the signal. It has nothing to do with the wiring of it.


NOTE: I may have that backwards :NOTE

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Old 05-02-2011, 12:48 PM   #33
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Quote:
Originally Posted by kellygnsd View Post
Just talking about USDM models, for the STi they use one of each for the crank or the cam sensor I'm just not sure which one is a reluctor type and the other is a hall effect. On the WRX they are both reluctor type.
The USDM uses hall effect for CAM trigger sensors. It is still magnetic for the crank, like all EJ motors. The EJ207 AVCS uses a magnetic (sin wave) for AVCS sensor type. The trigger on the cams are also different, see below.

Quote:
The trigger for the actual cam position on the end of the cam itself is also different between USDM and JDM cams so unless you have an aftermarket ECU or JDM ECU you will run into trouble making the JDM cams work with AVCS
Are you talking the diffence in trigger location or simply the well known positive/negative trigger... JDM is a raised bump and USDM uses the machined grove.

Again, the point is to use USDM heads, JDM cams, JDM triggers and of course JDM ECU. Why would anyone with USDM AVCS bother trying to add JDM AVCS? Maybe some misguided venture to run big port heads while retaining AVCS...which D25 heads can be ported as large and have avcs and don't need combustion chamber work. The only reason to port big port heads would be MAX power and th eassociated cams would make AVCS worthless.


My biggest concern at this point is actual cam trigger timing in relation to crank angle and then fitment differences for the sensors into the head. I need to get some hands on. Trying to pick up a locals EJ207 heads...

EVERYONE, PM b7g and tell him to sell me the heads so I can get this figured out

Last edited by Homemade WRX; 05-02-2011 at 12:59 PM.
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Old 05-02-2011, 12:59 PM   #34
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Well my friend said I could use hhis sensor for sizing and pictures just need to meet up with him, I Will just see how the jdm fits in the Sti headaswell
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Old 05-02-2011, 01:04 PM   #35
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do you have a set of JDM cams to see how the trigger lines up with the hole or a way to compare angular mounting of the sensor in relation to the cam? Degrees from the valve cover mating surface would probably be easiest to reference.
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Old 05-02-2011, 01:33 PM   #36
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Quote:
Originally Posted by Homemade WRX
do you have a set of JDM cams to see how the trigger lines up with the hole or a way to compare angular mounting of the sensor in relation to the cam? Degrees from the valve cover mating surface would probably be easiest to reference.
I have the cams but they are at the shop being put together with the heads and his heads are on his csr
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Old 05-02-2011, 01:53 PM   #37
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poop

ok, back to plan A.) Everyone PM b7g and have him sell me just his heads
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Old 05-02-2011, 02:25 PM   #38
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^^ no way, I told him I'd buy his everything. You can have the heads first though

Last edited by biodude; 05-02-2011 at 02:45 PM.
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Old 05-02-2011, 05:40 PM   #39
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Quote:
Originally Posted by Homemade WRX
poop

ok, back to plan A.) Everyone PM b7g and have him sell me just his heads
Well ok If I can find a 2.5 head, which he may have I will set them in there, and get pictures, but I'm not going to bolt it down or put on the valve covers,

Hey jdmspecc or whatever's their vendor name is.could get me two empty heads for like 750 shipped, big ports. Also you can buy new castings for like 500 a piece from jdmparts or whatever the site is. Hey pm me your number And I will just email the pictures when I get them, or your email, my photobuckets hates me I have to many pictures, also I forgot to save it the other day
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Old 05-02-2011, 09:31 PM   #40
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you lost my number from when you called last week?!!

I'll shoot it to you again. I may have a line on some trashed spec c heads...it'll at least get me the values I need short of the JDM cam trigger timing. I'll be slapping a block, heads and cam degree wheel on to sort this out.
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Old 05-02-2011, 10:44 PM   #41
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whats the reasoning for all that???? you wont gain anything without the cams, but if your doing it, tell me the true duration of my ver8 spec c cams :-)
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Old 05-02-2011, 11:15 PM   #42
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but cams are easier to get than head castings...that's why. People upgrade cams but not castings

The heads sound like they're good for nothing but scrap metal after talking with the guy tonight. He seems like a cool guy though.

You have email too.
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Old 05-02-2011, 11:44 PM   #43
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lol ok i will look, i dunno i cant seem to find any jdm upgrade cams, let me know if you do haha, and hardly any stock ones here
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Old 05-03-2011, 12:10 AM   #44
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Kelford, Jun, Tomei, GSC, etc....lots of aftermarket.
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Old 05-03-2011, 12:17 AM   #45
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yea at 1100 a set which is what, 300 more than usdm others, i will keep my stockers and make up for the little bit less top end i can make with the cams by adding 1-2 psi of boost lol
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Old 05-04-2011, 11:16 PM   #46
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I'm in the middle of a camshaft debate for my motor. I have built Ver8 big ports with JUN 272s but I'm rewiring and switching over to an AVCS setup and my Juns are non-avcs. i was thinking going with the GSC S1, will be great for daily driving but still has almost the same lift as the S2 272s and even the durations are not much different except for the S1s being set at 0.04" vs 0.05" on S2. I was the crazy top end but I also don't want to have ****y idle and lose any low end which is the bueaty of the S1 268s. Also I'm in the market to sell my Jun 272s. Any interest PM peoples!
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Old 05-05-2011, 09:23 AM   #47
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I hate the fact that they change the lift for the duration. Wonder if it's a marketing angle, hoping people are dumb and don't notice the change? Or if they wanted to base it at 1mm but then why do the others are .050"

oh well, not my problem.
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Old 05-06-2011, 09:22 AM   #48
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Some speculation:

The hall effect cam pickups coincided with the first implementation of throttle by wire, which was with the USDM Sti.

Since then, we have now the JDM Spec C that is dual avcs, throttle by wire.
Maybe they have hall effect sensors.
I am not sure if dual AVCS cams fit in single AVCS cars. If they do, the way to go may be with V10 EJ207 cams.

I can look up the part numbers for that engine's cam sensors and compare with USDM dual AVCS. If they are the same, you could sense those cams, if they physically fit.

Of course, you would have to locate someone that sells them first..
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Old 05-06-2011, 09:26 AM   #49
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Quote:
Originally Posted by Vlad
Some speculation:

The hall effect cam pickups coincided with the first implementation of throttle by wire, which was with the USDM Sti.

Since then, we have now the JDM Spec C that is dual avcs, throttle by wire.
Maybe they have hall effect sensors.
I am not sure if dual AVCS cams fit in single AVCS cars. If they do, the way to go may be with V10 EJ207 cams.

I can look up the part numbers for that engine's cam sensors and compare with USDM dual AVCS. If they are the same, you could sense those cams, if they physically fit.

Of course, you would have to locate someone that sells them first..
They ver 10 jdm is sti using a 16bit ecu with dual avcs???? Tell me where I Can get the ecu and the heads, I'm all game for dual avcs
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Old 05-06-2011, 09:28 AM   #50
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This is another speculation:

The 32 bit ECu coincided with USDM introduction

It may be a pre-requisite to run throttle by wire.

So my guess is that the Dual AVCS EJ207 Sti Spec C is 32bit.
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