non seq stock twins at 16psi?
#103
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and it also depends on the atmospheric pressure where the measurement is made and how accurate the $50 gauge is you are using to do the measurement
so again it's not a cut and dried answer
#105
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Maxcooper's read out is from the PFC, which as I've stated now 3 times doesn't read out the actual psi from the turbos.
If you only used the PFC to tell you boost and everything then yes it appears it is 16psi, but if you take an actual boost gauge or Mity vac. and test what the pressure REALLY is, then it is 17-17.5psi.
If you only used the PFC to tell you boost and everything then yes it appears it is 16psi, but if you take an actual boost gauge or Mity vac. and test what the pressure REALLY is, then it is 17-17.5psi.
#106
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the bottom line is the stock sensor was likely designed with a "buffer" or "window" of surplus pressure quantification to keep morons from blowing their engines by misusing it and being a bit off in their expected max boost
however, to make a blanket statement that "x" is the absolute hairy edge and you can always go to "x" and be safe is foolish
again, the big picture is why risk it for a $75 sensor, why not use the sensor actually designed for the job (what a concept)? that's the real issue here, not essay length novels about the stock boost sensor that no one will bother to read
however, to make a blanket statement that "x" is the absolute hairy edge and you can always go to "x" and be safe is foolish
again, the big picture is why risk it for a $75 sensor, why not use the sensor actually designed for the job (what a concept)? that's the real issue here, not essay length novels about the stock boost sensor that no one will bother to read
#107
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according to your test with your gauge, which is statistically irrelevant
#108
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Here I'll help you out, not that you are going to read it and LEARN something but hey can't say I didn't try. If you don't believe what Chuck says about tuning and the PFC you don't need to believe anything anyone says:
https://www.rx7club.com/showthread.p...ght=MAP+SENSOR
This is just an interesting thread to read that has to do with this:
https://www.rx7club.com/showthread.p...ght=MAP+SENSOR
#109
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Originally Posted by Matt Hey
Quote:
Originally Posted by Matt Hey
Did you calibrate your 3 bar sensor?
Originally Posted by Matt Hey
Did you calibrate your 3 bar sensor?
Originally Posted by 2007 ZX-10R
yes
If you didn't understand any of the above then please understand that you can't trust your PowerFC boost readings or settings. Please use a boost controller to reduce your chances of a blow motor.
I really don't have a problem with you using a 3 bar MAP sensor. It's a good idea if your going to go single. If you were a little more open minded you might learn something here.
#110
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But it IS more relevent than the test you have done on it.
Here I'll help you out, not that you are going to read it and LEARN something but hey can't say I didn't try. If you don't believe what Chuck says about tuning and the PFC you don't need to believe anything anyone says:
https://www.rx7club.com/showthread.p...ght=MAP+SENSOR
Here I'll help you out, not that you are going to read it and LEARN something but hey can't say I didn't try. If you don't believe what Chuck says about tuning and the PFC you don't need to believe anything anyone says:
https://www.rx7club.com/showthread.p...ght=MAP+SENSOR
#111
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atmospheric pressure in beautiful North Carolina
it works fine and has for two years, you'd have to ask Brian Cain how the various PFC settings were adjusted
I still use the Commander to monitor max boost because I know for a fact the Autometer pos gauge I have is off, which is a major reason I blew my previous motor
I'm sure I could spend countless hours on the PFC subforum and learn alot of stuff, but it's not all that important to me, that's why I paid a tuner, I'd rather be driving
Nobody seems to care about calibrating their MAP sensor correctly? If you don't get the correct absolute pressure from the given PIM voltage then that's ok huh? You can still tune it with the wrong pressure readings. You could use the default PIM scale and offset for your 3 bar MAP sensor and tune it so that it works. The boost readings, boost settings, and P-Rows would be way off but it should work for a little while. If you use a boost controller and never use boost data then you might get away with it. The default PowerFC maps work fine with the wrong PIM scale. It's certainly not a necessity but I believe one should either correctly calibrate or understand the problems caused by reading incorrect absolute pressures.
If you didn't understand any of the above then please understand that you can't trust your PowerFC boost readings or settings. Please use a boost controller to reduce your chances of a blow motor.
I really don't have a problem with you using a 3 bar MAP sensor. It's a good idea if your going to go single. If you were a little more open minded you might learn something here.
#112
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There is nothing cheap about it. Most RX-7 owners that boost 14-16 psi don't need to upgrade their pressure sensor. I bet more RX-7 owners boost this much with the stock sensor than with upgraded sensor.
...
IMHO, between the PowerFC settings that need to be made and the wiring job to connect the new 3 bar sensor, it's riskier and less reliable for someone running low boost to move up to the 3 bar sensor.
...
IMHO, between the PowerFC settings that need to be made and the wiring job to connect the new 3 bar sensor, it's riskier and less reliable for someone running low boost to move up to the 3 bar sensor.
Wade
#113
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ask Brian Cain or Steve Kan's opinion, they tune these cars for a living, everyone else is just spouting random opinions based on very limited experience, usually their own cars and that's it
over 1 bar gauge, you need the GM sensor, no one except those two guys are going to change my mind
over 1 bar gauge, you need the GM sensor, no one except those two guys are going to change my mind
#114
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i just think the 3 bar map sensor is a cheap piece of mind for any build i will now do if im going to up the boost past 14psi.. weither its right or wrong i dont care whats 100 dollars when you spend thousands on motors and performance parts..
If you own a FD you should now know not to go cheap or you will pop a motor.. do everything you can to save your motor.. thats my motto at least!
If you own a FD you should now know not to go cheap or you will pop a motor.. do everything you can to save your motor.. thats my motto at least!
#117
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i just think the 3 bar map sensor is a cheap piece of mind for any build i will now do if im going to up the boost past 14psi.. weither its right or wrong i dont care whats 100 dollars when you spend thousands on motors and performance parts..
If you own a FD you should now know not to go cheap or you will pop a motor.. do everything you can to save your motor.. thats my motto at least!
If you own a FD you should now know not to go cheap or you will pop a motor.. do everything you can to save your motor.. thats my motto at least!
the fact that all you anti-stock map sensor people ignore is: no matter what, if your car ain't tuned for past 17 lbs you're screwed either way, don't matter if you had a 25k gold plated 10 bar sensor - your ***** gonna blow same as a stock sensor.
#118
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It's not how much money you spend, it's spending what you do spend wisely.
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Your Autometer gauge is very likely more accurate than your Commander boost reading. Most professional RX-7 tuners do not know how to calibrate the MAP sensor so the boost reading will usually be off except at one pressure. Don't trust the Commander Boost reading to be correct! You can use it as a reference to see if something has changed but don't interpret anything from the value.
#120
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#121
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#123
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+2, Why spend extra money on something you don't need. I could buy the best everything and still blow my engine at 10psi. Tuning is where it is at, not the equipment, that is unless you pass the performace capabilites of the equipment, which in this case is 17-17.5psi. Running 16-17psi the stock map sensor if fine, anything about that I could see getting a 3bar but for 16-17psi it isn't worth the money, whether $1 or $1000.
#124
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Here is how to calibrate a map sensor:
https://www.rx7club.com/showpost.php...83&postcount=3
#125
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Here is how to calibrate a map sensor:
https://www.rx7club.com/showpost.php...83&postcount=3
https://www.rx7club.com/showpost.php...83&postcount=3