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#Cheap FCD

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 Post subject:
PostPosted: Sat Nov 15, 2003 8:35 pm 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
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Location: USA, OH, Cleveland (sometimes visiting DC though)
Yeah, the fuel cut isn't just a threshold. In my experience, the ECU cuts fuel if manifold pressure exceeds about 13psi for longer than about 3 seconds. Spikes less than 3 seconds don't cause fuel cut.

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PostPosted: Fri Jan 16, 2004 4:21 am 
Fourth Gear
Joined: Sun Nov 16, 2003 9:15 pm
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Location: Colorado
You guys should make these cheap FCD and sell them to lazy clauds like me.

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PostPosted: Fri Jan 16, 2004 4:32 am 
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Thats sort of what Im doing, except its an electronic unit with many features viewtopic.php?t=14620


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PostPosted: Fri Jan 16, 2004 4:44 am 
Vikash
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Location: USA, OH, Cleveland (sometimes visiting DC though)
$J-MoNeY-$ - You missed it; I sold the one I made in the Parts Shed. :)

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PostPosted: Mon Feb 09, 2004 6:24 pm 
Fourth Gear
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vrg3 wrote:
$J-MoNeY-$ - You missed it; I sold the one I made in the Parts Shed. :)
:shock: :cry: .

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 Post subject: THE END
PostPosted: Sun Feb 15, 2004 2:39 am 
In Neutral
Joined: Wed Sep 17, 2003 9:55 pm
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Location: Hanover, Pa. right outside of Gettysburg
I figured out that if you just bore a small hole in the vacuum line between the pressure exchange solenoid and the pressure sensor, you can push back the fuel cut. That way the pressure sensor still reads vacuum and boost, but bleeds just enough boost to push the fuel cut back to 15+ psi, depending on how big the hole is and how much boost you wish to bleed off.
I found this is a little safer than a check valve because your no totally loosing all the boost that the car needs to see to adjust the fuel intake.

This is my last post on this board due to the ridiculous and overly rude & competitive attitudes people seem to have.
It's sad that all Subaru, and especially Legacy Turbo, owners can't have common curtousy and respect to want to help one another without the total disrespect that I see on this board and other Subaru boards.

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Last edited by Zadok on Sun Feb 15, 2004 2:42 am, edited 1 time in total.

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PostPosted: Sun Feb 15, 2004 2:41 am 
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Zadok: Im sure confused. I think you are alone with that idea, it seems obvious you cant understand the emotion behind the posts. Im probably the rudest person here and I have hard feelings only towards one person.


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 Post subject: Re: THE END
PostPosted: Sun Feb 15, 2004 3:22 am 
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Zadok wrote:

This is my last post on this board due to the ridiculous and overly rude & competitive attitudes people seem to have.
It's sad that all Subaru, and especially Legacy Turbo, owners can't have common curtousy and respect to want to help one another without the total disrespect that I see on this board and other Subaru boards.


Wow! I totally disagree with you. I belong to almost every Subaru board there is and this is BY FAR the most easy going and friendly. I can't even fathom why you'd think that, except that you got a hard time about the car you have for sale. Nobody was rude about the rally tires were they? I also haven't actually seen to many post, if any (beside the above post), by you that weren't related to trying to sell something, so where did we fail to help you? Really, I don't see it.

Oh and I'm not knocking you at all but the above idea for getting around fuel cut doesn't sound like a good idea to me at all. All you're doing is creating a vacuum leak in your system.

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'92 SS 5mt. All go and no show. Sold :(
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PostPosted: Sun Feb 15, 2004 3:58 am 
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I guess nobody here bought his car. :lol:

Steve

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PostPosted: Sun Feb 15, 2004 4:36 am 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
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Location: USA, OH, Cleveland (sometimes visiting DC though)
Done right, the bleed can work. It'd be better than just using the check valve because it will allow the ECU to see some boost. It would be a small vacuum leak but that can be rectified with a check valve (making it just a boost leak), or could be small enough to ignore if you put a filter on it. Another advantage is that it can raise fuel cut instead of eliminating it.

Trouble is, it's hard to calibrate... to really know what you're doing to the signal you need to measure the effect it has on the transfer function when the engine is actually under boost.

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PostPosted: Sun Feb 15, 2004 6:44 am 
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Ok, but why do that when you can run a vrg3 Phase II FCD. :wink:

Seriously though, I was so blown away by the attack against the board that I guess I didn't read it right the first time. I thought he was saying to put the hole between the manifold and pressure exchange solenoid, not the pressure exchange solenoid and pressure sensor. I can see how it would be nice to raise, instead of eliminate, the fuel cut. I still wouldn't do this myself though, it just doesn't seem like a real good idea when there are other low cost options available IMO.

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'92 SS 5mt. All go and no show. Sold :(
'94 Audi UrS4 Modded (new project)
'96 Outback 5mt.
'07 Legacy 2.5i SE

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Oh... and I hope the fucker get bunked with Gunter, arrested for raping Gorillas.


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PostPosted: Tue Jul 06, 2004 12:51 pm 
Third Gear
Joined: Tue Oct 15, 2002 2:09 pm
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Location: Grants Pass, Oregon
I just put another bleeder (next to the boost) valve with a one way valve to keep it from leaking. So it only vents pressure. I opened the pressure switch bleeder all the way, opened the boost one a little at a time untill I got the Boost I wanted, then closed the sensor one a little at a time untill I hit the fuel cut, opened it a 1/4 turn. That's it, not to hard to calibrate. :)

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PostPosted: Sun Jul 25, 2004 1:56 am 
Fifth Gear
Joined: Sun Nov 30, 2003 8:02 am
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Location: salt lake city
do you still get the corect reading on you boost guage if you do this fcd

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PostPosted: Sun Jul 25, 2004 10:16 pm 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
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Location: USA, OH, Cleveland (sometimes visiting DC though)
As long as your boost gauge's signal line is tapped far from the leak (either very close to the manifold or -- preferably -- at another fitting on the manifold) it should read correctly.

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 Post subject: my check engine light comes on and the car sputters
PostPosted: Sun Oct 03, 2004 5:23 pm 
First Gear
Joined: Sun Feb 15, 2004 6:07 am
Posts: 196
Location: jamestown, ny
i put a check valve in, and when i try to run the car at boost it, the turbo sputters and the check engine light comes on. anyone know why this would be?

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92 legacy turbo 5spd fwd-12 psi, tm intercooler bov, walbro 255.

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PostPosted: Sun Oct 03, 2004 6:55 pm 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
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Location: USA, OH, Cleveland (sometimes visiting DC though)
What trouble code does the CEL show?

Where and how exactly did you plumb the check valve in?

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PostPosted: Sun Oct 03, 2004 7:29 pm 
First Gear
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Location: jamestown, ny
i dont know the code, the check engine light comes on. i put it in the exact same place as in the picture in the beginning of the thread.

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92 legacy turbo 5spd fwd-12 psi, tm intercooler bov, walbro 255.

81 chevy malibu- 400 sb, holley 600, edelbrock rpm, hooker headers, lunati voodoo cam,4spd muncie, 3:73 posi,monte c. swivel buckets, corvette rally wheels


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 Post subject:
PostPosted: Sun Oct 03, 2004 7:31 pm 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
Posts: 12517
Location: USA, OH, Cleveland (sometimes visiting DC though)
You should read the engine trouble code. The computer will tell you why it turned on the check engine light.

So you put a tee in the vacuum hose going to the pressure exchange solenoid, and then put a check valve on the third fitting on the tee pointed to flow outwards?

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PostPosted: Sat Oct 09, 2004 3:52 am 
First Gear
Joined: Sun Feb 15, 2004 6:07 am
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Location: jamestown, ny
OHHHHHHHH! i know where i messed up , i think. i didnt put a " T" in, just ran the check valve inline with the hose. i also have my boost gauge hooked up to that line right now, where else can i put my boost gauge line, i did have it hooked up to the pipe going from my intercooler to the throttle body. could you show me a picture of a better place to hook it up?

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92 legacy turbo 5spd fwd-12 psi, tm intercooler bov, walbro 255.

81 chevy malibu- 400 sb, holley 600, edelbrock rpm, hooker headers, lunati voodoo cam,4spd muncie, 3:73 posi,monte c. swivel buckets, corvette rally wheels


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PostPosted: Sat Oct 09, 2004 4:32 am 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
Posts: 12517
Location: USA, OH, Cleveland (sometimes visiting DC though)
Your boost gauge should still work okay on that line if you have it tapped close to the manifold.

Where to connect the gauge depends partly on what you want to read... Do you want to know compressor outlet pressure? Intercooler outlet pressure? Manifold pressure?

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 Post subject:
PostPosted: Sat Oct 09, 2004 4:47 am 
First Gear
Joined: Sun Feb 15, 2004 6:07 am
Posts: 196
Location: jamestown, ny
ill move it closer to the manifold, but that the problem right?

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92 legacy turbo 5spd fwd-12 psi, tm intercooler bov, walbro 255.

81 chevy malibu- 400 sb, holley 600, edelbrock rpm, hooker headers, lunati voodoo cam,4spd muncie, 3:73 posi,monte c. swivel buckets, corvette rally wheels


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 Post subject:
PostPosted: Sat Oct 09, 2004 5:05 am 
Vikash
Joined: Sun Nov 03, 2002 2:13 am
Posts: 12517
Location: USA, OH, Cleveland (sometimes visiting DC though)
But what's the problem?

Putting the check valve in the line to the sensor instead off a tee? Yeah, that's almost definitely a problem.

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 Post subject:
PostPosted: Sat Oct 09, 2004 5:13 am 
First Gear
Joined: Sun Feb 15, 2004 6:07 am
Posts: 196
Location: jamestown, ny
k, quick fix, thanks

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92 legacy turbo 5spd fwd-12 psi, tm intercooler bov, walbro 255.

81 chevy malibu- 400 sb, holley 600, edelbrock rpm, hooker headers, lunati voodoo cam,4spd muncie, 3:73 posi,monte c. swivel buckets, corvette rally wheels


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 Post subject:
PostPosted: Fri Jun 03, 2005 7:45 pm 
Second Gear
Joined: Tue Oct 15, 2002 1:38 pm
Posts: 351
Location: Markham, Ont. Canada
Does anyone has the parts # that use on the one way check valve and also where should I got those parts for this DIY FCD?

Thanks for help

Ben

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PostPosted: Mon Jun 06, 2005 3:04 am 
In Neutral
Joined: Sat Dec 04, 2004 9:57 pm
Posts: 6
Location: Toronto
Ben,

Talk to Nuwan, he has made a few, we just installed one on my legacy tonight and it works perfect. If you want send me a PM with your number and I will have him call you, his internet access is limited these days. You still doing the TSD's, we are planning for Tall Pines. :lol:



Ivano

Yes I now have a Turbo Legacy Too!!! :D

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