i have the star stage two and runing 5psi ,put my car on dyno and only made 143 hp. would a boost leak make me loss hp but still hit the 5psi? i mean i have alot done still stock internals for now but i mean thats low. helllp
#85059, "RE: boost leak hp loss" In response to Reply # 0 Apr-19-05 12:34 PM by baxsom
first off i am not an expert but if your gauge is saying 5psi then it is reading 5psi now your gauge could be messed up
before you go tearing into things thinking you have a leak check to make sure you actually have one using the boost leak finder thingy http://www.vfaq.com/mods/ICtester.html just to make sure because yes 140ish hp on 5psi is weak
#85060, "RE: boost leak hp loss" In response to Reply # 0
What kind of dyno?
Where is your boost gauge tapped for signal?
Were you using the dyno's wideband sensor? What was the A/F curve like?
Was it / does it break up somewhere in the powerband?
SO many variables, so little info. tisk, tisk.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#85062, "RE: boost leak hp loss" In response to Reply # 2
it was at a car show i just did it to mess around. all they did was put something on my sparkplug wires. the boost gauge is at the 3 tee in the back of the mani. on the dyno graph it looked like a roller coaster up and down then at 5.6 to 6.2 it was all broken up like spaces the guy said that it was not reading a signal anymore and thats what the gaps were there.
#85063, "RE: boost leak hp loss" In response to Reply # 3
Doesn't sound good. Post a pic of the graph.
Do you have an A/F gauge (crap blinky light, digital voltage readout, whatever) ? An EGT gauge? A fuel pressure gauge? any sort of tuning and diagnostic aid that could help me to help you?
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#85064, "RE: boost leak hp loss" In response to Reply # 4
i have all the gauges. blinky was in green, the voltage was at .97 to .96, egt was at like 1000 but its taped in the downpipe right after turbo. fuel was just under or right at 60 with 30lbs accel's and the sfmu
#85070, "RE: boost leak hp loss" In response to Reply # 9
why would you have to run rich with a front mount? the whole point in running rich(er) is to avoid detonation....but at 5psi i highly doubt you're maxing out the octane you're using. .92-.94 should free up some ponies yes, .96 is pinned full rich...and theres a huge difference between full rich and decently tuned. you have a bleed valve on your sfmu?
_ _ _ _ _ _ _ _ _
96 Black ESi 91 Red TSI AWD (RIP) 02 WRX
"turnin wrenches for nine hours in the pouring rain, just to get the beast up and running again"
Aerospace Certified TIG welder for Precision Castparts in Portland, OR.
#85073, "RE: boost leak hp loss" In response to Reply # 12 Apr-19-05 02:50 PM by Gsuperman
m/t. what should my fuel pressure be at with the 2.72 and short dark spring?what should me hp be at with 5 psi edit on the weekends i want to run 9 psi what should me volts read for that
Also use the search. Pleanty of people here are running #30s and a SFMU. I am using that same setup and I use the largest disk with the short dark spring, idle pressure is about 18-20 psi. Of course Im running between 11 and 13 psi on forged pistons and don't have near as large of turbo you do. Your best off using the search and finding what pressure you need for a similar setup.
#85087, "RE: boost leak hp loss" In response to Reply # 14
Man, at 5psi I tuned all the way down to like .88 on my o2 sensor before I got knock and EGT too high. .97 is stupid rich. You probably have black soot all over your back bumper. If you have SFMU, use bleed valve and idle pressure screw to back fuel off a little at a time to get that o2 reading at ~.92.
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