MAP sensor rise time (response time), and noise on MAP signal
#1
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Could you guys datalog this test:
While idling, jab the throttle very quickly and briefly around 3x, about a second apart.
Then from the datalogs, examine the rise time - the time it takes between - when the log shows the throttle hitting about 15-25%, to the time that the MAP sensor reads about 85-90 kPa.
I have an AEM, and in my case with just one restrictor, it's about 80-100 mS. My problem is that my MAP signal is noisy. If I make the restrictor smaller, the rise time goes to > 150 ms, and it causes a tip-in hesitation.
I'm interested especially with data with the MAP sensor connected to the FPR. I have a 2000 so I don't have an FPR.
While idling, jab the throttle very quickly and briefly around 3x, about a second apart.
Then from the datalogs, examine the rise time - the time it takes between - when the log shows the throttle hitting about 15-25%, to the time that the MAP sensor reads about 85-90 kPa.
I have an AEM, and in my case with just one restrictor, it's about 80-100 mS. My problem is that my MAP signal is noisy. If I make the restrictor smaller, the rise time goes to > 150 ms, and it causes a tip-in hesitation.
I'm interested especially with data with the MAP sensor connected to the FPR. I have a 2000 so I don't have an FPR.
#4
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I don't have the specific data you're looking for, but here and here is some data I collected on the MAP noise issue. I think it can probably be solved by sampling the MAP sensor in a different way (either at a different crank angle or by oversampling and filtering) but I haven't had a chance to experiment.
#6
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Jason, what map sensor are you using on your AEM?
I have a GM 3 bar and i am experiencing some strange issues that im sure i could get tuned out with something like this.
(main problem is free revving holding say 10% throttle (delta tps=0) the RPM will swing as much as 1000rpm)
I have a GM 3 bar and i am experiencing some strange issues that im sure i could get tuned out with something like this.
(main problem is free revving holding say 10% throttle (delta tps=0) the RPM will swing as much as 1000rpm)
#8
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I built a circuit which works great:
https://www.miataturbo.net/ecus-tuning-54/my-electronic-map-filter-circuit-48665/
https://www.miataturbo.net/ecus-tuning-54/my-electronic-map-filter-circuit-48665/
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