diy rpm activated switch.
1.0 BAR
Joined: Apr 2003
Posts: 288
Re:diy rpm activated switch.
Would there be interest in pre-made circuit boards? I could very easily get 20 or 30 boards made, probably $5-8/board for the BARE board - you'd have to solder it together yourself.
if there is interest, post here or email me.
if there is interest, post here or email me.
0.5 BAR
Joined: Dec 2003
Posts: 95
Re:diy rpm activated switch.
couldn't this circuit (less the LM2907) be adapted for use as an electronic boost controller? i mean run the MAP signal (with conditioning) and an adjustable reference voltage to the comparator - then have the output cycle a vac solonoid on waste gate. a simple panel meter (based on the LM3914 like the diy a/f gauge perhaps?) could be used to check your setting and monitor boost.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
0.5 BAR
Joined: Apr 2003
Posts: 188
Re:diy rpm activated switch.
Originally Posted by bobski
couldn't this circuit (less the LM2907) be adapted for use as an electronic boost controller? i mean run the MAP signal (with conditioning) and an adjustable reference voltage to the comparator - then have the output cycle a vac solonoid on waste gate. a simple panel meter (based on the LM3914 like the diy a/f gauge perhaps?) could be used to check your setting and monitor boost.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
i bought a group of 10 solenoid valves too, but they may not be ideally suited for boost control. i've already started work on the boost controller you're talking about though...
0.5 BAR
Joined: Dec 2003
Posts: 95
Re:diy rpm activated switch.
Originally Posted by scarecrowX
Originally Posted by bobski
couldn't this circuit (less the LM2907) be adapted for use as an electronic boost controller? i mean run the MAP signal (with conditioning) and an adjustable reference voltage to the comparator - then have the output cycle a vac solonoid on waste gate. a simple panel meter (based on the LM3914 like the diy a/f gauge perhaps?) could be used to check your setting and monitor boost.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
i figure it could probably be put together for under $30, and would be a nice step up from the bearing-spring MBCs, without spending $200+ on a commercial unit.
i guess you could take it another step and feed the RPM switch circuit with your speed pulser signal instead, then have the output switch on a higher boost level above a certain speed - traction control.
i bought a group of 10 solenoid valves too, but they may not be ideally suited for boost control. i've already started work on the boost controller you're talking about though...
. i had envisioned using a '88-91 civic purge solonoid (what i had on hand really) - it normally switches a control port between manifold vac and atmospheric pressure, so waste gate response would be quicker than, say, a on/off valve and a bleed orifice.
Thread Starter
3.0 BAR
Joined: Jan 2003
Posts: 7,081
Re:diy rpm activated switch.
I could possibly get 5 or more of those boards, let me know if they happen. pre made circuit boards would help, I have all kinds of crazy stuff going on on my a/f gauge pc board.
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