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0-5vdc RPM Output?
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08-07-2009, 04:33 AM | #1 |
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0-5vdc RPM Output?
Outside of a piggyback, is there anyway to get a 0-5vdc rpm output on our car? DME? Gauge cluster?
This guy seems to have found RPM info on the OBDII plug: http://www.e90post.com/forums/showth...nstalling+tach Last edited by Former_Boosted_IS; 08-07-2009 at 06:51 AM.. |
08-07-2009, 07:38 AM | #2 | |
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08-07-2009, 07:46 AM | #3 |
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08-07-2009, 08:31 AM | #6 |
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08-07-2009, 08:48 AM | #8 |
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08-07-2009, 08:51 AM | #9 |
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It is. I am trying to find a source that is not boost to trigger on. We can use IPW, but on Piezo injectors the voltage is through the roof. I basically have the ability to use 0-5vdc RPM data or 12v IPW data. There has to be a way to get 0-5vdc RPM data or something that resembles that.
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08-07-2009, 10:20 AM | #10 |
ASR Turbos+LSD+Meth= :D
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whats the issue with using boost?
no offence, but IMO using RPM as a progressive source to spray on doesnt make sence. heres an example: you're on a road course and you're navigating tight esses. you throttle on in some places but brake in others, keeping you're RPM high. if this is the case with your system, it will keep spraying until your RPM's drop no? and you're spraying when no throttle (gasoline) input is there. you can bog your engine or worse! anyway, what i'm trying to say is RPM doesn't seem like the smart choice for the progression. boost makes sense because when you throttle on low, you don't go above 0 psi... meaning no spraying. when you throttle more, to maybe 6 psi, it sprays a little, just like a little gas. then full on throttle is full boost then full pump pressure to spray. does what i'm saying make sence FB_IS? or will it not work the way i think an RPM depenedant spray will.
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08-07-2009, 10:24 AM | #11 | |
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The RPM or IPW / Boost have floors that mean you won't spray unless BOTH conditions are met. We need to spray more when more air is going into the engine at high rpms and we simply cannot due that with boost only. Trust me, I have tested and logged a lot on this. |
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08-07-2009, 10:28 AM | #12 |
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If the voltage is through the roof then can't you use a zener diode? Get a zener diode at a rating of 5V.
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08-07-2009, 10:34 AM | #14 |
ASR Turbos+LSD+Meth= :D
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you're right, we all taper at redline with our tiny snails. the only 335 that i've seen shift at redline and have it help is ASR's because of the upgraded babies.
i shift at 6500 RPM and always do because of the lights from the BMW PSW. right before the point in my dyno where boost tapers down a lot. i have my FPP at 13psi and the start at 4psi. so its a good progression. when i do get upgraded turbos ill bump the FPP to 16psi and bump up the shift lights to redline aswell. EDIT: good luck, i hope your system turns out to be an alternative.
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08-07-2009, 10:38 AM | #15 | |
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Boost/RPM based solve this problem. A lot of people have been working with me to contribute to the solution, so we owe a number of people thanks for making this happen. |
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