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Old 10-15-2015, 11:31 PM   #1
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Default Injector response time 99 Miata???

Does anyone know the injector response time for a 99 Miata in 1/1000 of a millisecond? I can't find the symbol but the closest is uS.
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Old 10-16-2015, 12:24 AM   #2
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900 to 1200 is probably a good start, assuming you want microseconds.

milliseconds is .9-1.2 @13.2v, multiply by 1k for micro/useconds.
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Old 10-16-2015, 05:36 PM   #3
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Thanks, I was thinking around 800 but I'll play with those numbers and see where it leads me. I'm helping a friend on his AEM FIC Rotrex tune.
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Old 10-17-2015, 02:15 AM   #4
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using .640 in a friend's build

yes, it sounds low, but compared to the older 90-97 injectors, the 99 and up injectors are a bit faster
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Old 10-17-2015, 02:21 AM   #5
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That's absolutely way too low.

99 injectors are closer to rx8 injectors, which I ran, and work well .9-1.2ms and also meshed with other measured results well.

.640 is closer to ev14 stuff a decade newer. My GT500 injectors use .630.

lol
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Old 10-17-2015, 02:27 AM   #6
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went off of this thread initially that I found after a few seconds of searching
https://www.miataturbo.net/ecus-tuni...d-times-60240/

frankly, that deadtime works fine until someone is able to properly find their specific deadtime with the logging method
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Old 10-17-2015, 02:29 AM   #7
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You must not have read the whole thread, huh?

Deadtime nearly half off what it should be probably doesn't run too good.
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Old 10-17-2015, 02:38 AM   #8
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are you still stuck on the 1.2ms from the old *** rx7 550's? have you done any research? Funny thing is, I even said the exact same thing you said to another guy in another thread and edited my response as I found evidence that the NB injectors are actually a newer design than NA's. So I tried it out

Should be the same generation as the rx8 injectors, or whatever the "EV6" design is. These are 256cc injectors, not some crazy large slow injector

Oh yeah, and the car tuned easily, drives great and idles perfectly with that deadtime. My friend still has yet to find the specific injector time with the deadtime method on this forum, but I really don't see what your problem is with that setting. He uses his car as a daily. Stock 99

Last edited by bmxfuel007; 10-17-2015 at 02:58 AM.
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Old 10-17-2015, 03:26 AM   #9
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RX8, you stupid ******. 8. 8>7. They are both denso, they look identical, one is yellow, one red. Don't you ******* tell me research, I've done mine.

RX8 is EV6, which I used, and settled with a dead time of 1.2ms. 99 = ev6, so it would have a similar deadtime. In the thread telling you how to measure it yourself, people with the same RX8's found similar 1.1-1.2ms numbers.

So why do you think they are .6, or twice as fast? Really?

Do research, because you suck at it.
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Old 10-17-2015, 03:30 AM   #10
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chill dood. then this guy is obviously wrong. There's no way rx7 550 ev1's and rx8 425 ev6's have the same deadtimes. plus the injectors is much much much smaller

https://www.miataturbo.net/ecus-tuni...61/#post751059
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Old 10-17-2015, 03:38 AM   #11
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Yeah, that is wrong. Use google to search, the right value is closer to 1.0.

https://www.miataturbo.net/diy-turbo...-review-67140/
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Old 10-17-2015, 03:46 AM   #12
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there are other threads too that point to a lower deadtime than 1.2ms not on mt.net
Rx8 Injector Deadtime - Forced Induction & N/A Power Mods - MX5Nutz Forum

OP, most important thing is that you figure out, after you get the car running, so just put it in whatever range you feel is reasonable, aka 1.0ms, and then log it and go through the process in this thread. simple as that :P oem injectors can run a range of whatever so you gotta figure out what yours are at

https://www.miataturbo.net/ecus-tuni...ad-time-56061/
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