VF39 Turbo Install Gone wrong - Subaru WRX Forum
 
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post #1 of 11 Old 06-16-2011, 03:10 PM Thread Starter
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VF39 Turbo Install Gone wrong

Hey guys,

I installed sti pinks injectors, walboro fuel pump, sti equivalent intercooler, 1 step colder spark plugs, an obx turbo inlet (because the stock one cracked) and a slightly used IHI VF39, cobb intake, and cobb accessport VF39 map.

I finally got everything installed.

I primed the turbo, started the car, it felt fine.

As soon as I started driving, and pllying load on the turbo . . . the turbo started making a harsh sound, and it would not boost properly.

Don't know if the turbo is fried . . . and now my check engine light is blinking telling me the engine is misfiring . . .any suggestions, or should I take it to a dealer???

ON the turbo inlet I used the bypass scheme as on the perrin turbo inlet.
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post #2 of 11 Old 06-16-2011, 03:35 PM
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mine did the same thing on a stage 2 map.i was also getting the same cel for missfire. come to find out my bolts were loose on the bypass valve. after i fixed that ive had no problems. btw i called cobb about the issue and they told me to check all my gaskets and normal 'wear and tear" items to make sure they dont need to be replaced. so ya make sure everything is tight.
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post #3 of 11 Old 06-16-2011, 03:50 PM Thread Starter
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does bypass valve = blow off valve,

I will recheck everything, I hope its something small, and not a blown turbo or engine.
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post #4 of 11 Old 06-16-2011, 04:04 PM
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yes the bypass valve is what comes stock on the subarus not a blow off valve.are you using the stock bypass valve or did you put an aftermarket blow off valve on there
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post #5 of 11 Old 06-16-2011, 04:12 PM Thread Starter
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I have a HKS SSQV blow-off valve
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post #6 of 11 Old 06-16-2011, 04:19 PM
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i bet thats your problem right there. you have to follow the map to the "t" our cars come stock with the bypass valve that puts the boost back into the car. the blow off valve you have releases the boost into the atmosphere. give cobb a call there a lot of help.
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post #7 of 11 Old 06-16-2011, 04:26 PM Thread Starter
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ok, I will call cobb, but I still have no idea why there seems to be a large harsh sound when I drive the car, don't know if its the turbo or not.
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post #8 of 11 Old 06-19-2011, 12:32 PM
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Also if the map you are using doesn't call for the fuel pump and injectors that may be part of it. Im pretty sure it does call for the injectors but not sure on the pump. But +1 about the bov. I would ditch that thing and get either a factory Bpv or a good aftermarket recirculating valve. Cobb makes one. Check it out. As far as the sound is it a screech or what? Check to make sure the oil return line is secure and the coolant line as well.

Kevin.
Cobb ap stage 2 ots, catless uppipe, catless turboback, Cobb Sf intake.
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post #9 of 11 Old 06-19-2011, 08:48 PM
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If its a walboro fuel pump, you dont need a tune for it, so the map doesnt really matter as far as that goes. But of course anything bigger than what you are tuned for or what a certain map calls for will cause issues.

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post #10 of 11 Old 06-20-2011, 03:41 PM
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Yeah fuel pumps are pretty dumb. From what I was reading in Dsport. The pumps normally operate in 13 or 16 volts. 16 volts will push the pump harder for more fuel. But, the injectors are what is ECU controlled. Not the fuel pump.

Kirt
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"When in doubt...flat out" - Colin McRae
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post #11 of 11 Old 06-20-2011, 03:47 PM
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Yeah that's good to know. Thanks. Anytime I've read about doing a fp it was in the same breath as injectors so I've always assumed it needed to be tuned for as well. But i see why not.

Kevin.
Cobb ap stage 2 ots, catless uppipe, catless turboback, Cobb Sf intake.
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