Guest Blue02wrx Posted February 2, 2004 Share Posted February 2, 2004 i was at a friends shop and he has a really nice gn and i was looking over it and saw a little electronic thing that wires into the alternator and has a fitting for a manifold pressure line. he says that when you roll into boost the thing ups the amps of the alternator. he says it's cool, the fuel pump pumps more the injectors work better and the headlights get brighter, amongst other things. the problem is he has no idea where it came from. it's an aftermarket piece so does anyone know where i can find one. google ended with no help. Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted February 2, 2004 Share Posted February 2, 2004 Hmm, i really dont see how that could be the case. It sounds like you are describing something that would blow air through the alternator to make it spin faster, however, since the alternator is belt driven, it can only turn as fast as the belt is turning. The amperage that the alternator is putting out would not make a difference if it was somehow boosted because it would only benefit if the system was too low of an amperage to start with. The reason headlights get brighter when you speed up is primarily because the voltage goes up from (typically) just below 12 to 13.5. The amperage will go up as well, but that only makes a difference (as I said) if the charging system is not producing enough amperage to power everything. Even if such a device existed, you probably wouldnt want it on an FI vehicle because you want to avoid voltage spikes and drops so you should (ideally) have everything powered by switched relays. Quote Link to comment Share on other sites More sharing options...
Xander Posted February 2, 2004 Share Posted February 2, 2004 The alternator has a sense wire. If you lower the voltage on this wire than the alternator will try to conpensate and up the voltage. I know this because I converted my externally regulated alternator (in my 260Z) to an internally regulated one. I can adjust the output power with the adjustment of the sense wire. Normally the sense wire is connected to a battery voltage. A diode has a fixed voltage drop of 0.6 volts. If you solder this into the sense wire you can up the battery voltage by 0.6 volts. I believe the alternator can output more than 16 volts without a problem. If the wiring harness is also able to sustain this is an other story. Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted February 2, 2004 Share Posted February 2, 2004 I believe the alternator can output more than 16 volts without a problem. If the wiring harness is also able to sustain this is an other story. And how about the ECU, the fuel pump, the guages, the lights.... If you REALLY wanted to up the voltage to a component, just put in a transformer for theat component, dont fry the whole car. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted February 4, 2004 Share Posted February 4, 2004 The device you described is called a volt-booster and there are 2 types that use different trigger mechanism. The one you saw is triggered by boost and the other type is triggered by TPS voltage. The boost obviously has nothing to do with the voltage and is just the trigger. I have been using the TPS-triggered one for quite some time and have absolutely no problems with it. At close to full throttle, the TPS triggers the volt booster and my voltage goes up to about 14.5. Lots debated as to its value but since I am demanding my pump to deliver at close to 72psi FP, I place value on it. Just look at the performance spec sheet of a pump at the level of FP and you will see how impotant voltage is. I do not think it is needed for even a warmed over turbo Z as "hot-wiring" the pump with 10-gauge should suffice. Quote Link to comment Share on other sites More sharing options...
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