Why am I hitting fuel cut at 11 PSI?

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IronMonkeyL255
Fourth Gear
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Why am I hitting fuel cut at 11 PSI?

Post by IronMonkeyL255 »

Or really, it seems like 10.5 PSI.

I have a WRX intercooler and a MBC, and I just recently started hitting fuel cut if pressure stays at about 10 or 11 PSI for too long.

Any ideas? I may just build Vikash's FCD and be done with it, but I'm just trying to figure out why it's cutting fuel at ~2 PSI lower than it should.........
Disclaimer: If anything I post is inaccurate, please correct me. I do not wish to add to the misinformation floating around on the internet.

That being said, everything I post is accurate to the best of my knowledge.

Rio Red '91 Legacy SS
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BSOD2600
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Post by BSOD2600 »

Maybe your elevation of ~1000ft is lowering the cutoff level?

'11 WRX Limited
'94 SS | 3" TBE, 07 TMIC, TD05H-16G, Revtronix Stage 2, Walbro -- Sold
'94 TW | R.I.P.
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mikec
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Post by mikec »

What are you using to determine how much boost you're producing? Maybe your boost gauge is off?
"That shouldn't be a problem, since I do regularly visit the realm of subatmospheric manifold pressures." -- vrg3
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All_talk
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Post by All_talk »

What are you measuring the pressure with? Most automotive gauges are only accurate within +/- 2-3 psi, might just be the gauge.

Gary
No matter how broke I am... I always seem to find two cents.
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IronMonkeyL255
Fourth Gear
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Joined: Sat Aug 09, 2003 5:02 pm
Location: Woodruff, SC

Post by IronMonkeyL255 »

Maybe.

I am judging it by my Autometer boost gauge, and I can't check how off it is since VRG3's scantool won't sync up to my ecu.......
Disclaimer: If anything I post is inaccurate, please correct me. I do not wish to add to the misinformation floating around on the internet.

That being said, everything I post is accurate to the best of my knowledge.

Rio Red '91 Legacy SS
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free5ty1e
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Post by free5ty1e »

Yeah, higher elevations seem to result in fuel cut at a lower MAP sensor reading, mine was at 13psig at sea level, and up here in Elko it was down to 10 or 11. I've found that I had to adjust my FCD's clamp voltage down from 4.2V to 3.9V in order to avoid fuel cut up here.
-Chris
91SS 4EAT stock, 200k mi
91SS 5MT rebuilt engine waiting for a shell
93TW 4EAT, Forester lift, 3" TBE, 11psi, 200k mi
94SS 5MT4.11+rLSD 311k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
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Bane
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Post by Bane »

where is your mbc connected?

has this been going on since the intercooler was installed or did it just start?
James L

'07 Magnum SXT - not stock
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'93 Legacy Turbo SS - 5spd conv, vf34, intercooled, K&N, dual stage mbc 11/16psi, hks 3" turbo-back w/hi-flow cat, kyb's, ADR 18" rims w/225/35/18zr's, 7" touch screen w/race camera
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