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Yesterday I was driving home from school and pinned it to merge onto US19. And i saw my boost guage and it was over 10PSI+ Like somewhere around 11PSI. And it started to stutter/ bogg down like it was running out of fuel. My friend told me that the injectors can only handle up to 8PSI then they wont be sufficent for more than 8psi of boost.
1st of all why is my truck getting over than 8PSI on the stock S/C???
What can I do to keep it under 8PSI???
First, your friend has no clue what he's talking about. Injectors are not rated by how much boost the engine makes. Yes, a lot of highly modified/built Lightnings have fuel upgrades that include using 60lb Siemens Deka injectors, but your stock injectors will still flow enough fuel for a moderately modified Lightning.
Sure, when you add an aftermarket supercharger and start pushing a lot of boost through the engine, you'll need to upgrade the injectors to stay safely within the envelope of safety, but the stock injectors are not rated by boost.
Second, please post a complete list of your mods. Simple things like a CAI will cause your stock boost gauge to record a higher than stock reading. The average reading from the addition of a CAI unit will be 1.5 to 2 lbs of boost.
One last thing, are you going by your stock boost gauge, or an aftermarket gauge?
What was the outside temps when this happened?
Stewart
__________________ The Brotherhood of FTE <-click the link 1999 F150 Lightning: WMS built block, 6lb lower, Monsterbox, Truetrac, CF driveshaft 1999 PSD F250 SC 4x4: 38R, Stage 2's, T-500, JW trans, Live Tuned, lotsa Riffraff stuff 2000 PSD Excursion 4x4: 38R, JW trans, F5, MBRP, AFE, OBA and Pre-Pump, V & B codes Never Fry Bacon NAKED!
Many stock L's will indicate over 10 psi stock. The more dense the air is to begin with the more boost the gauge will show. My truck typically peaks at 8 or 9 in the summer and will go to where 12 or 13 should be in the winter. I've got stock pullies and blower. BTW, the stock gauge sucks. It is fairly precise, but its accuracy is poor.
Whether or not you lose boost when you remove a restriction depends on where the restriction is. If it's downstream of the blower you should see a reduction in boost. If it's upstream you should see an increase.
__________________
1990 F-150XLT Lariat Stillon the original engine with no squeaks or rattles at over 300k miles
4.9/M5OD/3.08
16.89@77.09
145 rwhp, 272 rwtq
2001 Lightning #127
13.18@104, no chip, no pulley, no nitrous
Confuscious say "Man who have no use for jackstand have promising career as jackstand".
First, your friend has no clue what he's talking about. Injectors are not rated by how much boost the engine makes. Yes, a lot of highly modified/built Lightnings have fuel upgrades that include using 60lb Siemens Deka injectors, but your stock injectors will still flow enough fuel for a moderately modified Lightning.
Sure, when you add an aftermarket supercharger and start pushing a lot of boost through the engine, you'll need to upgrade the injectors to stay safely within the envelope of safety, but the stock injectors are not rated by boost.
Second, please post a complete list of your mods. Simple things like a CAI will cause your stock boost gauge to record a higher than stock reading. The average reading from the addition of a CAI unit will be 1.5 to 2 lbs of boost.
One last thing, are you going by your stock boost gauge, or an aftermarket gauge?
What was the outside temps when this happened?
Stewart
-It has a K&N Intake & a Borla Cat-Back...
-Stock Boost Gauge
-The Temps were around 65*F-70*F. But it has happened when it was warmer also.(80*F-90*F)
Whether or not you lose boost when you remove a restriction depends on where the restriction is. If it's downstream of the blower you should see a reduction in boost. If it's upstream you should see an increase.
d'oh! I must've turned my brain off or something.
Its always kind of interesting to hear people talk about losing boost when they install free-er flowing heads, exhaust, etc and then complain about it. All it means is that your engine moves air more efficiently.
__________________
Chris - Avid Winter Hater
2007 F-250 XLT 4x4 CC SB 6.0 PSD - ARP, IPR GEn2 EGR Delete, 4" turbo-back, no muffler, no cat, 6.4 banjo bolts, SCT X3, Tenney 270A alt, coolant filter, air bags, Ranchos, etc.
1994 Mustang GT - HCI, MM suspension parts, etc Novi2k waiting on the shelf
Hope & A Prayer Motorsports
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