FMIC Install and Tune Questions

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Benderama
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FMIC Install and Tune Questions

Post by Benderama » Thu Aug 29, 2013 7:33 pm

I am starting to plan for some mods on my new SS. The car is stock with the exception of an MBC. My plan is to run the car with the stock VF11, an aftermarket glass pack muffler (since my current muffler needs replaced) and a FMIC. I planned on setting the boost to 10PSI. My question is will I need a tune to take advantage of this setup? I understand that a tune will almost always net you more power, but I wanted to if I "NEED" a tune? I would be building a custom setup so I would keep the tubing as short as possible to eliminate lag. I was also wondering what diameter of tubing that I could use for the FMIC. I was thinking about using 2.5" since it will help with lag and then just stepping up the size when I get to the throttle body like the factory intake does. Will I be able to find a FMIC that will fit this style of thinking?

Disclaimer:
I am new to turbo cars so I am less familiar with some of these concepts. I have been working on Subaru's since my first car a 1993 Subaru Impreza L but this is my first Turbo Flat 4.
1994 Legacy SS 4.11 4EAT (Other mods planned)
De-Snorkled and K&N Air Filter

2013 Honda CR-Z 6 Speed Hyrbid

free5ty1e
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Re: FMIC Install and Tune Questions

Post by free5ty1e » Fri Aug 30, 2013 5:31 am

Add a Walbro 255lph wrx fuel pump to that list of mods and you can run 12 maybe 13 psi.

Your stock ecu csn adjust within these ranges. You won't need a tune (nor is it really an option anyway... gotta look at replacing the ecu -search for RobTune- or using a full standalone for higher power levels).

Fwiw, I have a fmic and the walbro pump and a slightly upgraded compressor and I run 15psi daily. It still runs quite rich, too...

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-Chris
91SS 4EAT stock
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

free5ty1e
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Re: FMIC Install and Tune Questions

Post by free5ty1e » Fri Aug 30, 2013 5:36 am

Also: exhaust piping makes for excellent ic piping. Plan out your paths and bends and you can probably have an exhaust shop make the majority of your piping for cheap. Make sure to get mandrel bends...much smoother than a crush bend. Also dont forget to have them roll the rims for you so the couplers have something to hold on to under pressure. I used worm clamps too and they work but T-bolt clamps would be optimal. They just expensive.

2.5" is a fine diameter for ic piping if you can.

Sent from my SAMSUNG-SGH-I337 using Tapatalk 4
-Chris
91SS 4EAT stock
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

cj91legss
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Re: FMIC Install and Tune Questions

Post by cj91legss » Fri Aug 30, 2013 7:06 am

The greddy fmic kit I have is 2" off the turbo, 2.5" in the pass fender well to my ic. And 2.75" from the ic to the throttle body, which is the same size and the tb. Almost no pressure loss.

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT

Benderama
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Re: FMIC Install and Tune Questions

Post by Benderama » Sun Sep 01, 2013 12:54 pm

Cool, Thanks for the input. Glad I wont need a tune. Walbro fuel pump eh? I still think that I will keep it around 10PSI but I will prolly add that to my list just for reliability sake. Good to know that I can go with small tubing to reduce lag this car is gonna be awesome. One more question. I am planning on tucking my IC in the bottom of my front bumper so to keep my sleeper appearance I want to paint it black. Is there a special paint I have to use? I don't want to reduce the effectiveness of the IC just to have it be black.
1994 Legacy SS 4.11 4EAT (Other mods planned)
De-Snorkled and K&N Air Filter

2013 Honda CR-Z 6 Speed Hyrbid

cj91legss
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Re: FMIC Install and Tune Questions

Post by cj91legss » Sun Sep 01, 2013 5:59 pm

Honestly, even with a thick coat of paint, I still feel like the intercooler will be cool to the touch because of how much air is hitting it while driving.
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT

free5ty1e
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Re: FMIC Install and Tune Questions

Post by free5ty1e » Sun Sep 01, 2013 6:06 pm

Forgot to mention, to surpass 13psi you need a method to prevent fuel cut (13+ psi for > 3 seconds = fuel gets cut for safety, ecu thinks youre overboosting)

Sent from my SAMSUNG-SGH-I337 using Tapatalk 4
-Chris
91SS 4EAT stock
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

free5ty1e
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Re: FMIC Install and Tune Questions

Post by free5ty1e » Sun Sep 01, 2013 11:05 pm

Also - walbro fuel pump is a good idea nonetheless, even at stock boost levels...#3 cylinder is last in line for fuel and it can starve with the stock pump, running leaner than the other cylinders....

Sent from my SAMSUNG-SGH-I337 using Tapatalk 4
-Chris
91SS 4EAT stock
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

subytech
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Re: FMIC Install and Tune Questions

Post by subytech » Sat Jan 25, 2014 8:48 pm

Not to mention as old as these cars are getting it's a good idea to do a fuel pump anyway. I went to leave a buddies house one night last year, drove fine on the way there, fuel pump just said F-you I'm done when I went to leave, didn't even try to start.
92 Legacy Turbo, 5sp MT, Early Large CC 20G heads, Ported custom clocked td04, Cobb catted DP, Injen SS 3" exhaust, Turbosmart MBC @ 10psi, Apexi 20g intake, custom FMIC, Fidanza 11lb flywheel, stock 05 WRX clutch

Mister Anderson
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Re: FMIC Install and Tune Questions

Post by Mister Anderson » Tue Feb 11, 2014 2:33 am



Cool video on installing a FMIC on our generation Legacys.
91 black SS 5 speed.... 300k on engine.
93 silver TW 5 speed... Track car project
73 kazen red VW bus riviera camper

robertpaige
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Re: FMIC Install and Tune Questions

Post by robertpaige » Tue Feb 11, 2014 3:22 am

Just upgrade to a TD04 while you're at it. Honesty not very hard and worth the while, especially if you're planning on running with a FMIC.


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Had more Legacy's than I know what to with...
Current: 92' SS

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