I found the time today to measure my injector deadtime for the injectors and configuration below. I used the procedure outlined on the MSextra web site using the Tunerstudio output test mode for injectors. I measured at the four points as outlined and then extrapolated the 0 crossing point and came up with approximately 0.30. Does this seem reasonable? I have never seen any other deadtime figures below 0.55.
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I've just built up a Porsche 914/4 2056 engine using the stock 2.0L Bosch injectors, 280-150-019 with MS3/MS3X and a JBPerf peak and hold driver board. I'm looking for a short cut on the dead time measurement for these injectors. Has anyone tested these injectors for dead time?
Bosch injector dead time - measured at .30 ??
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Dtjaden
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- Joined: Mon Jul 01, 2013 8:26 am
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Piledriver
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Re: Bosch injector dead time - measured at .30 ??
I have some low Z Bosch injectors on my desk that spec'd about .5ms, but they are GDi injectors off a Mazda 6. The driver kicks them on with a 100v capacitive discharge to get that low a number.
.30? highly dubious ...unless they are Piezoelectric, what are they?.
Most low Z injectors are ~.6-7ish, but all you can do is try it do the old 2/4 squirt sanity check and see if it gets richer or leaner.
If it does neither, you are about right.
.30? highly dubious ...unless they are Piezoelectric, what are they?.
Most low Z injectors are ~.6-7ish, but all you can do is try it do the old 2/4 squirt sanity check and see if it gets richer or leaner.
If it does neither, you are about right.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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Dtjaden
- Posts: 12
- Joined: Mon Jul 01, 2013 8:26 am
Re: Bosch injector dead time - measured at .30 ??
They are the stock Porsche/VW 2.0L injectors which are electromagnetic devices. After I posted the original message I remeasured and came up with essentially the same value. Just to be a little on the safe side I used .35ms as the dead time value and it has worked out well for the car.
I completed my "final" tuning element today - IAC using a Bosch 3 wire PWM IAC valve and now have the car running with a reasonable 1200 rpm idle at startup and settling down to 1000 rpm's when warmed up. The engine has a Webcam 86 which does not give very much of a Map signal at idle (65 - 70) so the 1000 rpm idle is very reasonable.
I am really happy with Megasquirt 3/3X and would recommend it to anyone!
I completed my "final" tuning element today - IAC using a Bosch 3 wire PWM IAC valve and now have the car running with a reasonable 1200 rpm idle at startup and settling down to 1000 rpm's when warmed up. The engine has a Webcam 86 which does not give very much of a Map signal at idle (65 - 70) so the 1000 rpm idle is very reasonable.
I am really happy with Megasquirt 3/3X and would recommend it to anyone!