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LinkBack | Thread Tools | Display Modes |
10-31-2009, 05:41 AM
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How does resistor mod increase boost?
So from reading thru all the post on here and over at FTC I understand that doing the resistor mod whether it be inline with the ICP feedback line (blue/green) or connected in parallel with the ICP via GRY/R - BL/GR. Either way you are effectively increasing fuel flow by tricking the PCM into thinking it's not delivering enough flow. This gives you more power and a rich mixture (hense the black smoke). What I don't understand is how this also increases boost. Guys have been saying they see an boost increase after doing this.. Can anyone explain?
Thanks 
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10-31-2009, 07:13 AM
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more fuel delivered to the engine means more exhaust gasses to spin the turbo harder which boosts pressure. that is why when you initially step on it there is a lag, because you over-fuel (black smoke) then the turbo starts to catch up and smoke goes away but turbo pressure is up because its spinning faster delivering good clean air to aid in fuel burn.
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10-31-2009, 07:37 AM
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Ya as said its as simple as more exhaust being made which directly creates more drive pressure in the turbo.
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10-31-2009, 05:51 PM
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I see, makes perfect sense. Thanks for enlightening me.
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10-31-2009, 06:19 PM
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Not to hijack your thread, but where could I find how to do this mod to my 2001 7.3 ?
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10-31-2009, 06:32 PM
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10-31-2009, 06:46 PM
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I slapped a 5.6K in parallel today just to test it. It definately livens things up quite a bit but IMO the idle sounds like crap. I'm gonna try hooking a 22K or 14.7K in series next weekend and see how that goes.
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10-31-2009, 07:14 PM
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how do you hook it up to a switch ?
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10-31-2009, 07:17 PM
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Just put a switch inline with the resistor.
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10-31-2009, 07:32 PM
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I'm a master cert. technician, and i'm still a little confused. Can you put the resistor on the harness side of the plug ?
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