diy rpm activated switch.
01-22-2004, 10:58 AM
#11
1.0 BAR
Join Date: 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.
01-23-2004, 01:17 AM
#13
0.5 BAR
Join Date: 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.
01-25-2004, 06:39 PM
#15
0.5 BAR
Join Date: 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...
01-26-2004, 10:39 AM
#16
0.5 BAR
Join Date: 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.
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