TurboBuicks.com - View Single Post - Razor's PAC Kit

Razor · 09-04-2004, 09:38 PM

Well.. here's the situation, see the 3 bar sensor has a different voltage swing than the two bar. For instance they are both powered by 5 volt source, now the three bar scaling is different. For instance the three bar at zero vacuum is 1.6volts on the green wire. The factory 2 bar is 2.4 volts on the green wire.

What this means is the factory GN boost guage is calibrated for 2.4 volts at zero boost, so you have to get to like 6-7 PSI of boost on the three bar before the factory guage starts to read. If you would like to have the the factory guage to read correctly, then a new plug would be needed for the three bar, and piggy back its 5volts and ground..then use the green wire from the three bar. Most that use this kit will not use the factory LED guages siince its limited to 15 PSI and not accurrate.

Hence why I include an LED to be placed next to your aftermarket boost guage, so as its needle sweeps up past 4 PSI it turns on. Now you dont have to follow anything I decide, this is just done in an effort to make the kit plug-n-play as far as settings are concerned. Just keep in mind the larger the boost swing, the greater the resolution you will have on the system due to the greater voltage swing coming from the MAP sensor.

Example, you want the kit to produce 100 PSI pressure at 20 PSI boost. You can get to this level by turning on the kit at whatever PSI you wish and then recalibrating the "Initial". The higher the turnon point, the greater amount of initial needed to multiply voltage increase per PSI. Turning it on lower produces a gradual rise in pressure.

If you move the turnon point, from factory 4 PSI to lets say 8 PSI, and leave the initial alone, if before you got 100 PSI at 20, now it wont happen until your at 24 PSI. Now turning it on at 8 PSI .. increase the "Initial" you can get your 100 PSI at 20 PSI boost.

Make sense.

This is what makes my controller what it is.

So to recap, putting the 3 bar sensor in place of the factory 2 bar makes the factory LED boost guage useless. It wont hurt the factory LED guage. Sorry. Solution is to run the 3 bar on stand-alone if the factory guage is important to you.

09-04-2004, 09:38 PM	#2 (permalink)
Razor Registered User Join Date: Jul 2003 Location: Tampa, Florida Posts: 883	Well.. here's the situation, see the 3 bar sensor has a different voltage swing than the two bar. For instance they are both powered by 5 volt source, now the three bar scaling is different. For instance the three bar at zero vacuum is 1.6volts on the green wire. The factory 2 bar is 2.4 volts on the green wire. What this means is the factory GN boost guage is calibrated for 2.4 volts at zero boost, so you have to get to like 6-7 PSI of boost on the three bar before the factory guage starts to read. If you would like to have the the factory guage to read correctly, then a new plug would be needed for the three bar, and piggy back its 5volts and ground..then use the green wire from the three bar. Most that use this kit will not use the factory LED guages siince its limited to 15 PSI and not accurrate. Hence why I include an LED to be placed next to your aftermarket boost guage, so as its needle sweeps up past 4 PSI it turns on. Now you dont have to follow anything I decide, this is just done in an effort to make the kit plug-n-play as far as settings are concerned. Just keep in mind the larger the boost swing, the greater the resolution you will have on the system due to the greater voltage swing coming from the MAP sensor. Example, you want the kit to produce 100 PSI pressure at 20 PSI boost. You can get to this level by turning on the kit at whatever PSI you wish and then recalibrating the "Initial". The higher the turnon point, the greater amount of initial needed to multiply voltage increase per PSI. Turning it on lower produces a gradual rise in pressure. If you move the turnon point, from factory 4 PSI to lets say 8 PSI, and leave the initial alone, if before you got 100 PSI at 20, now it wont happen until your at 24 PSI. Now turning it on at 8 PSI .. increase the "Initial" you can get your 100 PSI at 20 PSI boost. Make sense. This is what makes my controller what it is. So to recap, putting the 3 bar sensor in place of the factory 2 bar makes the factory LED boost guage useless. It wont hurt the factory LED guage. Sorry. Solution is to run the 3 bar on stand-alone if the factory guage is important to you.