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Old 02-14-2019, 06:15 PM   #51
Mreed6360
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Quote:
Originally Posted by Zadok View Post
Thatís good. I have E85 at the pump 3 mins from my house for under $2 a gal.

Iím going to throw in the 20x and get a header, uppipe, maybe even a turbo if I can swing it. Then pay this Cobb pro tuner I know to make it right. The exhaust cam position is the only thing that scares me. I can certainly advance or retard it a tooth if that will fix it, but I have no idea how to actually figure that out.
The "resting" position of the exhaust cams slightly advanced, I ended up timing them one tooth retarded. It's not the right way, but it's the path I took. It puts them within a degree or so of "normal". There is a detent pin in the avcs system that keeps the system from moving when it isn't getting the "move" signal from the solenoid.

So far so good
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Old 02-14-2019, 06:16 PM   #52
Mreed6360
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From what I'm told you can't tune the stock ECU in the Baja. I have a 05 turbo with a bad motor, I'm not sure if I should just get the rebuild done on the ej255 or swap to the ej20x. What do you guys think? Pros or cons to doing what you guys did or should I just do the rebuild? I'm in Arizona btw if anybody else is and can recommend a place. Thanks!
I'm not sure about Cobb's tuning options, but the Baja ecu responds fine to the openport 2 from tactrix.
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Old 02-18-2019, 12:49 PM   #53
Zadok
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I donít have the Baja Ecu anymore. Mine died and I got an 04 FXT.
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Old 03-09-2019, 07:23 PM   #54
05lgt6969
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Im about to do the ej20x swap and want to know which turbo setup to go with the twin scroll on the 20x or the one of my lgt wagon. Which is better power wise
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Old 03-12-2019, 11:22 AM   #55
Mreed6360
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From my research/experience I would say it depends on what your goals are.

I find the VF38 twin scroll gives good response, spools early and can flow plenty well to give good mid-rpm torque, but runs out of efficiency at higher RPMS. As a downside swapping over to the VF38 down pipe is a pain, as it isn't used on many models, and none in the US that I know of, so using it makes future upgrades harder. See the pics earlier in the thread of my slightly ugly custom welded down pipe.

I'm not sure what setup is on your lgt wagon, but if it's like the EJ255 setup that was in the Baja I think you are better off with that setup on the EJ20X motor if outright power is your goal, and you want to possibly upgrade later.

How well the setup you end up with works together will depend a lot on your tune/ what you do with the AVCS (see earlier comments on exhaust cam timing). In my case the car ran "OK" with the stock Baja ECU on the EJ20X with the twin scroll setup, but it was improved greatly by tuning.
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Old 03-12-2019, 10:24 PM   #56
05lgt6969
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Originally Posted by Mreed6360 View Post
From my research/experience I would say it depends on what your goals are.

I find the VF38 twin scroll gives good response, spools early and can flow plenty well to give good mid-rpm torque, but runs out of efficiency at higher RPMS. As a downside swapping over to the VF38 down pipe is a pain, as it isn't used on many models, and none in the US that I know of, so using it makes future upgrades harder. See the pics earlier in the thread of my slightly ugly custom welded down pipe.

I'm not sure what setup is on your lgt wagon, but if it's like the EJ255 setup that was in the Baja I think you are better off with that setup on the EJ20X motor if outright power is your goal, and you want to possibly upgrade later.

How well the setup you end up with works together will depend a lot on your tune/ what you do with the AVCS (see earlier comments on exhaust cam timing). In my case the car ran "OK" with the stock Baja ECU on the EJ20X with the twin scroll setup, but it was improved greatly by tuning.


Yeah its the 255 i have half of the down pipe and i have access to a welder. So we'll both have slightly ugly down pipes hahaha. Im going to cut the cat out of the up pipe anyway im debating cutting the one out of the down pipe because of engine lights i dont have to worry about emissions for inspection but i just dont want it unless something else is wrong. i also have the jdm tmic but if i keep the jdm setup do i loose out on upgrade choices. Hopefully my cams arent wasted in the 255 i know if i use the 255 cams i need to swap cam sensorsbut im not sure what else i have to switch over
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Old 03-13-2019, 09:57 PM   #57
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I thought quite a few guys are running the ej20x/y swap (in their wrx) just fine with leaving the exhaust avcs unplugged.
By retarding the exhaust by 1 tooth, is that ccw 1 tooth relative to the lower timing mark on the intake sprocket?
Thanks
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Old 03-14-2019, 02:02 PM   #58
Mreed6360
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Quote:
Originally Posted by 05lgt6969 View Post
Yeah its the 255 i have half of the down pipe and i have access to a welder. So we'll both have slightly ugly down pipes hahaha. Im going to cut the cat out of the up pipe anyway im debating cutting the one out of the down pipe because of engine lights i dont have to worry about emissions for inspection but i just dont want it unless something else is wrong. i also have the jdm tmic but if i keep the jdm setup do i loose out on upgrade choices. Hopefully my cams arent wasted in the 255 i know if i use the 255 cams i need to swap cam sensorsbut im not sure what else i have to switch over
On the exhaust cams, if the 255 exhaust cams are still good you could swap those into the 20X. Then you would be totally correct on the exhaust cam timing.

For the intake cams as long at the intake cam position sensors are the same on your 255 and the 20x then that can just leave the 20X stuff intact. There are some models what use a different number of wires (i think 2 compared to 3) but I don't remember which ones did that.

I though I was going to have to swap/ relocate cam sensors, but I didn't have to. Just plug and play for mine. But you would want to double check, I don't know what the model split is.

Thumbs up on that down pipe though! it took some work to get it to line up perfect, lots of test fitting before the weld, but I'm liking it.
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Old 03-14-2019, 02:21 PM   #59
Mreed6360
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Quote:
Originally Posted by Rensho68 View Post
I thought quite a few guys are running the ej20x/y swap (in their wrx) just fine with leaving the exhaust avcs unplugged.
By retarding the exhaust by 1 tooth, is that ccw 1 tooth relative to the lower timing mark on the intake sprocket?
Thanks
I'm sure it would run pretty well, from what I've mostly heard the exhaust AVCS is not as "important" as the intake, at least as far as making power goes.

I bet there is power to be gained from the exhaust AVCS too, but once we start messing around with motor/intake/parts swapping a good portion of all the hard work done by Subaru engineers goes out the window.

I've read that the intake and exhaust cams will work in unison to active an EGR like effect under certain loads/ conditions. Allowing some exhaust gas to get sucked back into the combustion chamber (reversion). So not having the exhaust active has some impact emissions and fuel consumption wise I'm sure.

You are correct about the direction I moved the exhaust cam.

This is from memory, so it may be a little fuzzy, but I think each cam tooth is about 7 degrees.

So moving a cam one tooth moves the cam about 14 degrees relative to the crank since the cams turn at half the speed of the crank.

The exhaust cams rest in an advance position (maybe 15 degrees? or 10?).
So rotating the exhaust cams one tooth CCW puts them close to where a fixed position cam would normally be.

I wanted to reuse my fixed EJ255 exhaust cams, but they were shot, so this was the next best option in my time/$ budget. There are "better" ways to do it, but this worked for me.
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Old 03-15-2019, 07:39 PM   #60
Zadok
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looks like I'm going to be getting my 20Y in 2 weeks. then I'm not sure if I'm going to buy a new turbo or modify my downpipe.
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Old 03-16-2019, 03:07 PM   #61
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You think a td06-20g turbo would be over kill for the 20x hahahahahah
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