Cheap FCD

That spinning thing that makes all of the cool noises. OE and Aftermarket.

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NICO
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Post by NICO »

u guys could be right about the other methods. i am going to try them i will see if it makes it better. i am also using a turbosmart fule cut in the car for better air gas flow and torque. sorry for the bad word it in my nature how i grew up but i will let u guys no very soon new tricks i love this car so many ways 4 tricks ciao.
IggDawg
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Post by IggDawg »

I did something like this. a little different. if I'm seeing this right, you have it bleeding to the atmosphere under pressure so the MAP can't see it? the way I had it was just a one-way check valve inline with the line you have a tee in. that way, the valve would open under vacuum and close for anything over 0 PSI. I noticed that under boost, I had no fuel cut of course. but it seemed a little lazy. like, not as much power as before. doesn't the computer play with timing under boost? if it doesn't see boost won't the timing be off, giving you less power? that';s what seemed like was happenning. of course, my knockl sensor was on the fritz at that point, so it could have been set to "bad mood" during the runs with the check valve. I dunno. that's just what I experienced.
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morgie
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Post by morgie »

EGT now installed... I did the install job this evening, with reorganisation of the other gauges... took me 3 hours to do everything.


But the result is nice and will be worth it ! :)


Here's the pics as usual :


Since i used the strap to install the probe, i couldn't put it in the #3 runner.. but i put it close enougth.

HiRes : http://images3.fotki.com/v33/free/78262 ... img-or.jpg
Image

HiRes : http://images3.fotki.com/v32/free/78262 ... img-or.jpg
Image

All Images : http://public.fotki.com/morgie/morgie/m ... EGT_Gauge/
morgie
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legazee
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diy fcd

Post by legazee »

hey morgie is this still working ok on ur car? have u noticed any changes in ur egt's or air/fuel ratios since u have been running it for a few weeks now. i remeber reading about the guys that used to run the legacy sti's in the rallies before imprezas got popular and they talked about a trick they did to the the boost sensor setup to fool it into letting them have full boost while they were readying for launch and not worrry about fuel cut at all...i wonder if it was something like what u came up with. i am looking forward to being able to remove all of that old crap and not have to deal with it, i have already put in a mbc that is almost right on top of the turbo with very short silicone tubing.this looks like a good thing to play around with maybe this week 8)
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Post by vrg3 »

If you're planning on putting a mechanical FCD on your car like this one, I'd suggest trying a relief valve instead of a check valve, so the ECU can still see some boost. You could use something similar to what I described in my post about my boost controller.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
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Post by FrmRgz2Rchz »

If the check valve is bleeding off boost so that the solenoid doesn't engage fuel cut, you are releasing air that the MAF has already accounted for. The MAF proportions the fuel according to the air it reads. If you are loosing some air, but still getting the same amount of fuel, wouldn't that be the reason for running rich.
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Post by morgie »

it's right, but the quantity of air escaping the system is quite small, so that don't seems to have a big effect.
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Post by vrg3 »

Yeah, it would be a tiny amount considering how much air the turbo pushes on boost... But if you're really concerned about it, you could tee the line going into the bottom passenger side of the intake resonator box (from the wastegate control solenoid) and run the output of the relief valve into it. That would keep it a closed system.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
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Post by morgie »

vrg3 : You're the man ;)
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Post by vrg3 »

Heh, thanks... :oops:

...why?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
Gordo
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Works for me...

Post by Gordo »

This is all well and fine and works just great for me and everyone else, but the big question is... how much boost has been found to be safe with no additional fuel management. Has anyone seen any bad numbers (EGT or A/F) above 13 psi? I've yet to install any EGT indication but it's on the list.
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Post by morgie »

Gordo : Just this morning, i was running 13psi (still on my drag config, 10psi in 3rd = 13psi in 5th..) , and i noticed a 1600°F reading on my EGT !
that was pretty hot, so i steped out of gas and lowered boost to 10

Vrg3 : bah, because you have all the right answers ;) in french we say "L'homme de la situation" :)
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Post by vrg3 »

Morgie: Ah, I gotcha. :) In English we use the phrase "you da man" too. :)
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
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Post by NuwanD »

thanks a bunch morgie, now i am finally running 15 psi and it feels great!

just a side note i am using a check valve which opens at 11 psi rather than one that opens under any boost. I assume this is a better setup so the ECU knows to dump lots of fuel... anyways if anybody needs some of these valves i can get some more.

Thanks!!!
Nuwan
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Gordo
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Fuel cut defeat

Post by Gordo »

I've gone a step further and T'ed off the same place but I've used a PRV with the spring set to 10 psi. That way the A/F map for positive pressures can still be used by the ECU. I am also running too rich above that (.85 to .95vdc). I did hit the fuel cut once while experimenting at 20 psi because of the line size of the T. I've since gone to a larger line and have yet to test it again as I'm a bit nervous of going into this territory anyway. I'd like to increase the boost until the A/F mixture starts to improve somewhat. I normally run around 15 psi.
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free5ty1e
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Post by free5ty1e »

Nice setup morgie!

I have a 2 5/8" autometer EGT with the clamp-on sensor, I've been looking everywhere for pillar gauge pods for my '94. What pods fit the left-hand drive pillars, and how many...?

One more question - FCD = Fuel Cut Disable? At what point will my ECU cut the fuel? Am I to understand from these discussions that I could simply install my MBC and boost gauge along with this FCD mod, turn the boost up to 15 psi, and go to the track without worrying about detonation...?? This car has no intercooler! :shock:
-Chris
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92SS 4EAT - RIP :(
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Post by mTk »

Fuel cut occurs @13psi, i think the general consensus is that you should only run 10-11psi max before getting an intercooler.

MK
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Post by free5ty1e »

Good general info to know. Stock boost is what, 8psi? I read somewhere the EJ22T makes 160hp, and is 8.0:1 compression ratio. Is this accurate?
-Chris
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91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
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Post by mTk »

free5ty1e wrote:Good general info to know. Stock boost is what, 8psi? I read somewhere the EJ22T makes 160hp, and is 8.0:1 compression ratio. Is this accurate?
8.7psi max stock, and yup, 160hp 8.0:1

MK
1992 BC672 AWD 5MT
eastbaysubaru
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Post by eastbaysubaru »

It's been said in another thread that the Honda CRX pillar pod works. You should do a search for it as I don't remember what year CRX.

-Brian
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Post by georryan »

It was an 87-9-something crx pillar pod. I think Brat4by4 has one along wtih I'm not sure who else.
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Post by georryan »

Gordo : Just this morning, i was running 13psi (still on my drag config, 10psi in 3rd = 13psi in 5th..) , and i noticed a 1600°F reading on my EGT !
that was pretty hot, so i steped out of gas and lowered boost to 10
What should temperatures be at, or staying around?

-Ryan
91 Pearl White Sport Sedan
04 Java Black Pearl Forester XT
2014 Volvo S60 T5
18 KTM 1290 Adventure S

87 Grey GL-10 Sedan (so long old buddy) - donated
97 Toyota 4Runner SR5 - sold
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free5ty1e
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Post by free5ty1e »

Yeah - I just realized upon closer inspection that my standard cup mounts will work just fine. The Legacy's pillar is pretty flat :) Shoulda thought that one through before asking.

Hmm my EGT reads max 1600*F, yes I too would like to know what's the safe range to be running in. I have a basic A/F meter too but want to tune properly, from the EGT first and the A/F meter for secondary information... whats the logic?
-Chris
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91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
max boost
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Post by max boost »

I just installed a boost controler and i ran boost up to 18 psi and thats were i hit my fuel cut. I turned it down to 15 psi, i was just wondering is it different for every car (fuel cut).
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Post by 91White-T »

It might be that the boost spiked up to 18 before the computer had a chance to cut fuel. Either that or your MAP sensor isn't working. Fuel cut shoud be the same since all the ECU's are basically the same.
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