2560 on a 99 motor at 14psi with MSPNP 300hp - 241ft/lbs
01-04-2008, 06:57 PM
#22
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here it is scott. http://www.miatamx5.com/dynoruns/12-....miata_003.drf
that rest are obviously in the same directory
Last edited by paul; 01-04-2008 at 07:08 PM.
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01-04-2008, 08:27 PM
#25
If the solenoids are not operating, then the butterflies are in the open position. A vacuum has to be applied to the solenoid to close the butterflies. I had a 99 intake on my engine with the 99 head, operated the VICS via the Hydra ECU. Removed the head for a BRP R4 intake.
On another note, I ran WAY more timing on my engine with the MP62. I've been told the SC can take more timing than a turbo.
On another note, I ran WAY more timing on my engine with the MP62. I've been told the SC can take more timing than a turbo.
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01-04-2008, 09:01 PM
#28
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With that kinda power, my gt2860rs might be overkill.
what rpm made 8psi?
Last edited by hustler; 01-04-2008 at 09:17 PM.
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01-04-2008, 09:05 PM
#29
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Your **** is going to be ******* fast, and make boost sooner if you just pinned it at tdc.
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01-06-2008, 06:58 PM
#31
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You have it backwards. Hence the need for a vacuum canister...as you go WOT the vacuum in the canister keeps the actuator "closed" until you hit the 5200 or 5600 crossover, then the solenoid opens or closes or whatever and the actuator "opens".
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01-06-2008, 07:20 PM
#33
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Oh! yeah that'd be a great idea actually. I know mcmaster has a few 12V solenoids that have decent stroke. go see how much that vacuum canister actuator moves (probably around .5 inch I'd guess) and go look up an electric version on mcmcaster.
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01-06-2008, 08:00 PM
#36
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here are the butterflies when no vacuum is applied, they are open
here are the butterflies when vacuum is applied, they are closed
here here is how much the actuator arm moves, 1/2" just as Tim guessed
here is the vacuum solenoid
contrary to what some people believe/say these butterflies do not vary the length of the intake runners by redirecting air. in fact what they do is open an additional resonance chamber, much like the external helmholtz resonance chamber found on the intake crossover tubes of the earlier Miatas which is beneficial at low rpm/low velocity intake charge.
now where are these mechanical/electrical solenoids?
here are the butterflies when vacuum is applied, they are closed
here here is how much the actuator arm moves, 1/2" just as Tim guessed
here is the vacuum solenoid
contrary to what some people believe/say these butterflies do not vary the length of the intake runners by redirecting air. in fact what they do is open an additional resonance chamber, much like the external helmholtz resonance chamber found on the intake crossover tubes of the earlier Miatas which is beneficial at low rpm/low velocity intake charge.
now where are these mechanical/electrical solenoids?
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01-06-2008, 08:07 PM
#37
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so you just needs these to open these at a certain rpm? that's an easy mod!
use the MS to switch the solenoid to ground at whatever RPM, and they'll open. or does the solenoid close with v12?
use the MS to switch the solenoid to ground at whatever RPM, and they'll open. or does the solenoid close with v12?
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01-06-2008, 09:31 PM
#40
Paul, there are 2 solenoids in the VICS system, your photos show both, all you need is an rpm switch to control the electric solenoid operation to feed vacuum or not to the solenoid controlling the butterflies. My Hydra does this, as the BRAIN said the MS will, or you could run an MSD rpm switch or something like that.
Like you said, the VICS doesn't shortcut the intake runners, it opens the butterflies to allow air from a small port into the system. I helped dyno test an N/A 2000 Miata engine, only had a header and exhaust on it, with a 1.6l AFM. The dyno showed the engine ran best when the VICS opened the butterflies at 5600rpm. It was easy to see the difference on the dyno graphs. Even with the 1.6l AFM, the car made 129rwhp with only a Fuji 4/1 header and simple Supertrapp exhaust. The Supertrapp was very restrictive when running street quiet, street disks reduced power to 119. I think a straight through with a Magnaflow would have kept the power at 129. Pretty sweet for an otherwise stock engine.
If you don't want to run the VICS, I've read that keeping the butterflies closed will afford best power at low and little sacrifice up top.
Like you said, the VICS doesn't shortcut the intake runners, it opens the butterflies to allow air from a small port into the system. I helped dyno test an N/A 2000 Miata engine, only had a header and exhaust on it, with a 1.6l AFM. The dyno showed the engine ran best when the VICS opened the butterflies at 5600rpm. It was easy to see the difference on the dyno graphs. Even with the 1.6l AFM, the car made 129rwhp with only a Fuji 4/1 header and simple Supertrapp exhaust. The Supertrapp was very restrictive when running street quiet, street disks reduced power to 119. I think a straight through with a Magnaflow would have kept the power at 129. Pretty sweet for an otherwise stock engine.
If you don't want to run the VICS, I've read that keeping the butterflies closed will afford best power at low and little sacrifice up top.
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