With proper tuning, how much boost can a stock BP handle out of the VJ-20? Any ideas?
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-Robert
'93 Protege Turbo LX 5-speed
-GTX VJ-20 turbo w/ custom downpipe, Haltech E6K Kit w/ 3Bar MAP sensor & O2 sensor (Engine Management System), .040 overbored pistons with slightly raised compression, Resurfaced cylinder head & valve job, GReddy Type-S BOV, Turbo XS boost controller, 450cc injectors, Walbro 255lph fuel pump, 22"x9"x3" FMIC, full 3" exhaust w/ Catco Catylic converter & Summit Turbo Muffler, ACT Clutch Kit (stage 2), Uretheane shifter bushing, Triple Gauge Pod w/ Boost, Air/Fuel Ratio, and Oil Pressure gauges, Falken Azenis Sport 195/60HR14 tires on steelies.Tags: None
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you shouldnt run the vj20 more than 15 psi considering how small it is.James G.
sobe83@yahoo.com
AIM: DVS 323BPT
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Originally posted by limpgtx
you shouldnt run the vj20 more than 15 psi considering how small it is.
:edit: nevermind. ;D just found the info saying its good for 15psi. lol-mike lucero
1988 Mazda 323 GTX
2001 Isuzu Rodeo
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nah its too small to be spoolin over 15psi. technically, the gtx ecu doesnt understand anything over 14.7 psi.James G.
sobe83@yahoo.com
AIM: DVS 323BPT
MySpace
Cardomain
<BR>
<marquee>Turbonetics T3/T4, RC 550cc injectors, Walbro fuel pump, SSAutochrome Miata manifold, Tial 35mm wastegate, large FMIC, Apex-I SAFC, GReddy Type S BOV, 2.5" aluminum charge pipes, NGK plugs/wires, RX-7 VAM, 3" turbo-back exhaust, ARP head studs, H&R Springs, S/R struts, Sony XPlod deck-2/12" subs, Power Acoustic 800w amp, Pioneer speakers, Evo front bumper, ADR DV8 17" wheels.</marquee>
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Originally posted by limpgtx
nah its too small to be spoolin over 15psi. technically, the gtx ecu doesnt understand anything over 14.7 psi.-Robert
'93 Protege Turbo LX 5-speed
-GTX VJ-20 turbo w/ custom downpipe, Haltech E6K Kit w/ 3Bar MAP sensor & O2 sensor (Engine Management System), .040 overbored pistons with slightly raised compression, Resurfaced cylinder head & valve job, GReddy Type-S BOV, Turbo XS boost controller, 450cc injectors, Walbro 255lph fuel pump, 22"x9"x3" FMIC, full 3" exhaust w/ Catco Catylic converter & Summit Turbo Muffler, ACT Clutch Kit (stage 2), Uretheane shifter bushing, Triple Gauge Pod w/ Boost, Air/Fuel Ratio, and Oil Pressure gauges, Falken Azenis Sport 195/60HR14 tires on steelies.
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If you are running haltech, you can run more boost but there is no point since you will just be going beyond the turbo's efficiency range and you will just be forcing hot air into the engine. If you are looking to run boost higher than 14psi, I would suggest a bigger turbo.1991 Mazda 323 GTR Sedan
MODS:
GTR motor swap, F&R Familia strut bars, MX-3 Rear Lower strut tie bar, GTX front bumper, GTX grill, EDM headlights & corners, EDM 323 rear garnish, EDM spoiler, EGT sideskirts, MX-3 seats, GTX steering wheel, EGT glass sunroof, WRX hood scoop (functional!!), and other things that take too much space to list.....
TO DO LIST:
EDM/JDM rear bumper
EDM/JDM power folding mirrors
Repaint car
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dont bother trying to tune anything with the vj20, personally its not worth it if u wanna go fast. its the weakest part of the engine, bad flow, small turbine, spools way too quickly (less top end power), not ball bearing...you catch my drift. investing in a t3/t04e would be your best betJames G.
sobe83@yahoo.com
AIM: DVS 323BPT
MySpace
Cardomain
<BR>
<marquee>Turbonetics T3/T4, RC 550cc injectors, Walbro fuel pump, SSAutochrome Miata manifold, Tial 35mm wastegate, large FMIC, Apex-I SAFC, GReddy Type S BOV, 2.5" aluminum charge pipes, NGK plugs/wires, RX-7 VAM, 3" turbo-back exhaust, ARP head studs, H&R Springs, S/R struts, Sony XPlod deck-2/12" subs, Power Acoustic 800w amp, Pioneer speakers, Evo front bumper, ADR DV8 17" wheels.</marquee>
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here's what happens with dyno pulls on haltec equipped VJ-20s at 15 and then at 20 lbs..."Never run out of real estate, traction & ideas at the same time"
-93 MR2, 129 ES
ClubProtege.com Tech Articles
Originally posted by WTFRemember low compression makes more space for AIR, HEEELLOOOO!
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20 lbs"Never run out of real estate, traction & ideas at the same time"
-93 MR2, 129 ES
ClubProtege.com Tech Articles
Originally posted by WTFRemember low compression makes more space for AIR, HEEELLOOOO!
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torque curve sucked ass though....i'd rather run the 15psi graph.93' Noble Green MX-ZE (sold )
02' Graphite Grey WRX Stage 4, 286whp
05' Pontiac Vibe daily driver, lowered/tinted/rims
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u get the same amount of hp at 15psi-20psi, enough said.James G.
sobe83@yahoo.com
AIM: DVS 323BPT
MySpace
Cardomain
<BR>
<marquee>Turbonetics T3/T4, RC 550cc injectors, Walbro fuel pump, SSAutochrome Miata manifold, Tial 35mm wastegate, large FMIC, Apex-I SAFC, GReddy Type S BOV, 2.5" aluminum charge pipes, NGK plugs/wires, RX-7 VAM, 3" turbo-back exhaust, ARP head studs, H&R Springs, S/R struts, Sony XPlod deck-2/12" subs, Power Acoustic 800w amp, Pioneer speakers, Evo front bumper, ADR DV8 17" wheels.</marquee>
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Dang that sucks.. it's nice to have that much more torque though if you can keep traction. Limpgtx thanks for the advice, you're right, but I can't go out and get another turbo now, don't have the money. Thanks for the graphs Jesse they were helpful.-Robert
'93 Protege Turbo LX 5-speed
-GTX VJ-20 turbo w/ custom downpipe, Haltech E6K Kit w/ 3Bar MAP sensor & O2 sensor (Engine Management System), .040 overbored pistons with slightly raised compression, Resurfaced cylinder head & valve job, GReddy Type-S BOV, Turbo XS boost controller, 450cc injectors, Walbro 255lph fuel pump, 22"x9"x3" FMIC, full 3" exhaust w/ Catco Catylic converter & Summit Turbo Muffler, ACT Clutch Kit (stage 2), Uretheane shifter bushing, Triple Gauge Pod w/ Boost, Air/Fuel Ratio, and Oil Pressure gauges, Falken Azenis Sport 195/60HR14 tires on steelies.
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Originally posted by Gro Harlem
torque curve sucked ass though....i'd rather run the 15psi graph.Ryan The middle child is always ignored
BP powered 97LX Touring Edition
Vibrant strut tower brace, KVR front brake pads, Tungsram Megalicht H4 headlight bulbs, Phillips Halogen H3 foglight bulbs.... 91 GT rims w/ 195 60 14 Yokohomo Mirada GTX sport
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