RPM Switch Schematic
#1
RPM Switch Schematic
I found an old archived thread that showed a schematic of how to build an rpm switch to activate the 5th/6th ports, but the pic was down. Does anyone have this (or a similar) schematic diagram?
I know there's one for sale on summit racing, but I want to see if it's cheaper to build my own first.
Thanks- Terrence
I know there's one for sale on summit racing, but I want to see if it's cheaper to build my own first.
Thanks- Terrence
#3
well, all that is is just a frequency choke... or maybe just a high pass filter. Either way, it needs a positive biased opamp comparator at the end to actually "switch" when it hits the right rpm.
I just need the schematic with the right resistor/capacitor values to build it.
I just need the schematic with the right resistor/capacitor values to build it.
#4
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DIY frequency switch kit: http://autospeed.drive.com.au/cms/A_2810/article.html
#5
That's pretty cool as well. Cheaper than MSD or Summit, but with shipping it'll still come out over 50 bucks. I'm sure I'll be able to do better than that. I guess I'll just have to do trial and error until I figure something out
Thanks for that site though. I found a link to the original manufacturer of that frequency switch, and they have some really cool, inexpensive kits, like turbo timers and boost controllers.
Thanks for that site though. I found a link to the original manufacturer of that frequency switch, and they have some really cool, inexpensive kits, like turbo timers and boost controllers.
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do the air solenoids for 5th/6th require a PWM signal, or do you just allow 12V to hit them so they let the pressure through to move the air actuators throughout the duration that you want them open? does any care need to be taken to then allow this pressure to fall off after the 5th/6th are supposed to close? or will this happen on its own due to imperfect sealing?
same questions for VDI system (though i would imagine these are the same ANSWERS as well)
thanks,
Max
same questions for VDI system (though i would imagine these are the same ANSWERS as well)
thanks,
Max
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#8
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do the air solenoids for 5th/6th require a PWM signal, or do you just allow 12V to hit them so they let the pressure through to move the air actuators throughout the duration that you want them open? does any care need to be taken to then allow this pressure to fall off after the 5th/6th are supposed to close? or will this happen on its own due to imperfect sealing?
same questions for VDI system (though i would imagine these are the same ANSWERS as well)
thanks,
Max
same questions for VDI system (though i would imagine these are the same ANSWERS as well)
thanks,
Max
#9
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you could do it even cheaper, buy a cheap ebay adjustable shiftlight and use that to throw a relay connected to the solenoid. http://cgi.ebay.com/ebaymotors/Shift...spagenameZWDVW
25 dollars shipped, and if you use it to throw a relay which activates the solenoid then it doesn't matter if it ramps voltage up
25 dollars shipped, and if you use it to throw a relay which activates the solenoid then it doesn't matter if it ramps voltage up
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