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Old 04-02-2004, 08:57 PM   #1
ursine
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Impreza GC8 Voltage Clamp

I am working on turbocharging my RS and I dont want to do anything crazy, just something in the 3-4 psi range (its my daily driver), I cant afford to run something like a Link so I am just going to use a Vortech RRFPR, a Power Inc. Fuel Pump and some injectors that according to part numbers should be STi injectors. And from doing research it appears that I need a Voltage Clamp, first off, what do they do? Secondly, based on my setup what kind should I get and how much should I expect to pay?
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Old 04-02-2004, 09:17 PM   #2
8Complex

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If you're going to go about it that way, just use a voltage clamp, fuel pump, and an RRFPR, do not install injectors as well. You might also consider some timing control or knock monitoring like a J&S Knock Computer which retards the timing as it hears knocking (before it even becomes audible).
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Old 04-02-2004, 09:21 PM   #3
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Since your car is factory NA, your ECU would go into fuel cut mode if it sees enough positive manifold pressure. The voltage clamp keeps the MAP voltage low enough to prevent the ECU from doing this. I think you can make these with about $5-10 worth of parts from RadioShack... there's really nothing to them.
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Old 04-02-2004, 09:28 PM   #4
ursine
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Quote:
Originally posted by 8Complex
If you're going to go about it that way, just use a voltage clamp, fuel pump, and an RRFPR, do not install injectors as well.
Why not the injectors? Should I go with WRX ones instead?

Quote:
Originally posted by ScoobaruRS
I think you can make these with about $5-10 worth of parts from RadioShack... there's really nothing to them.
Do you know where I can find directions?
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Old 04-02-2004, 09:29 PM   #5
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you can buy them from http://www.splitsec.com/products/clamps.htm.

There's also one built into the V2 J&S Safeguards and the Greddy e-Manage.
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Old 04-02-2004, 10:07 PM   #6
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Quote:
Originally posted by lotusTT
There's also one built into the V2 J&S Safeguards and the Greddy e-Manage.
Would I be better off just getting one of these instead? How much do these run?
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Old 04-02-2004, 10:13 PM   #7
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Yes, it would be much safer and more reliable.

They're both about $400-500 for everything you'd need to use them. For the e-manage, you'd need the main unit, ignition harness, support tool, and possibly the pressure sensor.
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Old 04-02-2004, 10:16 PM   #8
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Injectors with just a RRFPR would lead to FAR too much fuel for the car, let alone when it's idling the ECU wouldn't be able to trim enough back.
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Old 04-03-2004, 06:13 PM   #9
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Hey I have a split second timing device, and a VC2 voltage clamp for sale. They came with my Forced air Tech stage 3 turbo kit, but im not using them anymore. I am just looking to get rid of them both let me know if you are interested. Pm'd you too BTW..
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Old 04-03-2004, 08:58 PM   #10
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What does a split second timing device do? Do I need one?
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Old 04-03-2004, 09:09 PM   #11
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It retards timing per pound of boost. you don't "need" one to have a turbo charged car, but if you want reliable horsepower it is the way to go. I have heard of a lot of guys blowing motors, and knocking only under 6psi of boost.. with this you can pull timing 0-30 degrees, per pound of boost. It saved my butt a couple of times. Anyone else have any more input on this?
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