Tach issue
#1
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Tach issue
I recently installed my AEM. Using the provided startup calibration I started the car unfortunately the tach didn't work. After some reading I found that 95 does not have a tach signal from the coils to the tach. I then tried this: Setup>Advance setup>Tach/Speedo Control>Options> then change the tach output to 2 which activates LS7 the tach output. After I did this the tach worked however when I would blip the throttle the tach would go to zero while the engine gains RPM, once I take my foot off the throttle the tach would read rpm. Any help with this issue would be greatly appreciated.
#3
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I have a 97 and had to change the number on the Tach output as well. Copied rafa's settings for this that he had on his 96.
Its worked for the last 2 engines I blew up along the way.
I'll check and can post up my settings.
Its worked for the last 2 engines I blew up along the way.
I'll check and can post up my settings.
#6
Yeah, I'm looking at a 1710, I just wondered what you were using. I searched and saw your boomslang conversion thread for the 1710. So, the LS7 output can generate the correct signal then? That's what I was after. According to AEM's pinouts they have both the early car's and the 95.5+ tach pins going to LS7. I'm guessing you just turn on an internal tach driver in the software then?
#7
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Yeah, I'm looking at a 1710, I just wondered what you were using. I searched and saw your boomslang conversion thread for the 1710. So, the LS7 output can generate the correct signal then? That's what I was after. According to AEM's pinouts they have both the early car's and the 95.5+ tach pins going to LS7. I'm guessing you just turn on an internal tach driver in the software then?
#10
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I guess I'm no help, these are the only options that helped me to get mine working and you already have done that. Its like you have some sort of interference while on the throttle or something.
#12
I recently installed my AEM. Using the provided startup calibration I started the car unfortunately the tach didn't work. After some reading I found that 95 does not have a tach signal from the coils to the tach. I then tried this: Setup>Advance setup>Tach/Speedo Control>Options> then change the tach output to 2 which activates LS7 the tach output. After I did this the tach worked however when I would blip the throttle the tach would go to zero while the engine gains RPM, once I take my foot off the throttle the tach would read rpm. Any help with this issue would be greatly appreciated.
#13
Yeah, I'm looking at a 1710, I just wondered what you were using. I searched and saw your boomslang conversion thread for the 1710. So, the LS7 output can generate the correct signal then? That's what I was after. According to AEM's pinouts they have both the early car's and the 95.5+ tach pins going to LS7. I'm guessing you just turn on an internal tach driver in the software then?
IIRC we got BikeInDirt's car (same as yours) with a simple transistor hooked to the crank signal wire which grounds the LS7 output per significant crank signal edge which simulates what the stock '90-'95 coil packs are doing. Flyin' Miata were selling a box like that in the past for few bucks too, but it is very easy to DIY if you have to - prolly 5 minutes once you buy the part which should cost cents.
Or the better option is: just upgrade to a 12 tooth wheel from TSE, use the NB crank sensor and let the AEM drive the tach (put 3 in the Tacho field). The main benefit is that the 12 tooth wheel has 6 times better resolution than the stock one (12 teeth vs 2) plus it is not cam driven thus you get much better timing control ...
#14
IIRC we got BikeInDirt's car (same as yours) with a simple transistor hooked to the crank signal wire which grounds the LS7 output per significant crank signal edge which simulates what the stock '90-'95 coil packs are doing. Flyin' Miata were selling a box like that in the past for few bucks too, but it is very easy to DIY if you have to - prolly 5 minutes once you buy the part which should cost cents.
Or the better option is: just upgrade to a 12 tooth wheel from TSE, use the NB crank sensor and let the AEM drive the tach (put 3 in the Tacho field). The main benefit is that the 12 tooth wheel has 6 times better resolution than the stock one (12 teeth vs 2) plus it is not cam driven thus you get much better timing control ...
#17
I found this:
http://forum.miata.net/vb/showthread.php?t=387335
and this:
https://www.miataturbo.net/showthrea...light=12+tooth
No 3 pagers though.
Are there any specifics / instructions when I buy the trigger wheel?
http://forum.miata.net/vb/showthread.php?t=387335
and this:
https://www.miataturbo.net/showthrea...light=12+tooth
No 3 pagers though.
Are there any specifics / instructions when I buy the trigger wheel?
#18
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Not really, no. It was a pet project for a few AEM guys, and I can provide a little setup help if you are running NB sensors, but if you're going to use the NA cam sensor, it's best to follow J_Man's instructions below.
http://forum.miata.net/vb/showpost.p...8&postcount=28
http://forum.miata.net/vb/showpost.p...8&postcount=28
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