Author Topic: New DP, low boost  (Read 30606 times)

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Offline Scoobum

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Re: New DP, low boost
« Reply #135 on: June 21 2017, 08:27:52 PM »
When I ran alky I'd always see blips of KR. When I ran race gas...nothing. ..with the 02's being the same. My theory was the alky wasn't staying in a uniform pattern...with the alky pump possibly not staying at an even pressure.

If memory serves, I believe it was Julio that said the air rushing through the TB was something like 200-300 mph. If the alky pressure varied even slightly, I'd be thinking you'd see hints of KR. Just a theory.

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Offline Shimy87

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Re: New DP, low boost
« Reply #136 on: June 21 2017, 08:33:50 PM »
Map is in stock location on pass fender. log look like mine, gauge reads smooth so I think I'm ok. Alky theory seems sound to me. Will be bumping up the boost on gauge to 24 and will then tune from there. Thanks guys.....more info to follow when I can get some time. Putting in a paver patio so wife has me on a short leash with car fun right now.
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Offline Steve Wood

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Re: New DP, low boost
« Reply #137 on: June 21 2017, 09:23:45 PM »
We are taking a theoretical constant 5.0 volt feed and supplying it to the map sensor which then sends a proportional analog voltage back to us which gets converted to a digital equivalent and then it is sampled 20+ times a second.  On average, it is a good approximation.  Same with the O2 voltage, fuel pressure sensor if so equipped, etc.  All of them tend to come out with a lot of chatter which makes no sense at all other than we are screwing with the signal in a less than perfect sense.  Ideally, we would apply a smoothing factor to the chatter and make it look more like the original analog signal.

That was a 10.3 run at 129 mph as I recall.

If we look too closely, we may over analyze things beyond the reliability of the data we are looking at.
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Offline Shimy87

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Re: New DP, low boost
« Reply #138 on: June 21 2017, 09:45:42 PM »
Thanks Steve...im the king of over anaylizing things. Tuning is much better/ more fun than dismanteling this old gal 10 times a day.cant imagine a 10.3, im shooting for upper 11's an fully expect that this year.  :rock:
87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline motorhead

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Re: New DP, low boost
« Reply #139 on: June 22 2017, 08:44:58 AM »
So why not just put a quality pressure transducer into the plenum and run it straight into the datalogger?  You could then treat that as your constant and just reference the MAP.

Quality transducers are far less sensitive to changes (voltage, pressure pulses, temp, etc) than an OEM MAP.
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Offline good2win22

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Re: New DP, low boost
« Reply #140 on: June 22 2017, 06:58:46 PM »
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Offline motorhead

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Re: New DP, low boost
« Reply #141 on: June 22 2017, 09:44:34 PM »
I am using an SSI pressure sensor mounted in the plenum.


http://www.ssi-sensors.com/pdfs/Pressure%20Sensors/P51/PS-AN10_LOW%20GAUGE%20PRESSURE.pdf

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Re: New DP, low boost
« Reply #142 on: June 23 2017, 09:06:49 AM »
Made in my dad's home town. They were probably a gm supplier before they shut that plant down.
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Offline good2win22

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Re: New DP, low boost
« Reply #143 on: June 24 2017, 11:23:32 AM »
I am using an SSI pressure sensor mounted in the plenum.


http://www.ssi-sensors.com/pdfs/Pressure%20Sensors/P51/PS-AN10_LOW%20GAUGE%20PRESSURE.pdf

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Re: New DP, low boost
« Reply #144 on: June 26 2017, 07:41:18 AM »
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