Power FC how far off is your pfc from your boost gauge?
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how far off is your pfc from your boost gauge?
I did a little converting on my boost figures from my power fc. it said i was hitting 19.3psi when my boost gauge was showing 16psi, with a slight spike to 17. i've got a gm 3bar. i seriously don't think i could hit 19psi on pump gas without having issues so far. my boost gauge is a defi d series
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The PFC Commander does not display boost correctly, however, that is a very large discrepancy and usually the PFC reads LESS than the boost gauge.
Where is your boost gauge T-ed into and what adjustments have you made to the PFC for the 3-bar sensor?
Also, if you don't have the data-logit, you can do a ghost trace and see what cells the PFC is actually in when it's reading 19 psi.
Where is your boost gauge T-ed into and what adjustments have you made to the PFC for the 3-bar sensor?
Also, if you don't have the data-logit, you can do a ghost trace and see what cells the PFC is actually in when it's reading 19 psi.
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the boost gauge is running right off of my uim at the extra port like most people i know.
jason at the rx7store did the 3bar install and tune. he set it to option 3.
i just did the peak hold and was kinda glancin at it and at my boost gauge while doing a hard 3rd gear pull. it did it around 8k where my boost gauge had showed a slight spike
jason at the rx7store did the 3bar install and tune. he set it to option 3.
i just did the peak hold and was kinda glancin at it and at my boost gauge while doing a hard 3rd gear pull. it did it around 8k where my boost gauge had showed a slight spike
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#6
20B FD|20B Cosmo|S5 TII
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remember altitude also has something to do with it. here's my conversion calculations for my altitude;
absolute(psi) 8.0 9.0 10.0 10.5 11.0 11.5 12.0 13.0 14.0 15.0
pfc( kg/cm2) .54 .61 .68 .72 .75 .78 .82 .88 .95
gauge/manifold(psi) 10.3 11.3 12.3 12.8 13.3 13.8 14.3 15.3 16.3
so its kind of impossible to match them up, but imagine those are in columns. 8.0 absolute=.54 pfc=10.3psi on the gauge.
pretty crazy huh? my avc-r reads the same as my gauge, just in .bar.
imagine my suprise the first time i hooked up a boost gauge and saw over 12psi the first time i hit the gas!!!
absolute(psi) 8.0 9.0 10.0 10.5 11.0 11.5 12.0 13.0 14.0 15.0
pfc( kg/cm2) .54 .61 .68 .72 .75 .78 .82 .88 .95
gauge/manifold(psi) 10.3 11.3 12.3 12.8 13.3 13.8 14.3 15.3 16.3
so its kind of impossible to match them up, but imagine those are in columns. 8.0 absolute=.54 pfc=10.3psi on the gauge.
pretty crazy huh? my avc-r reads the same as my gauge, just in .bar.
imagine my suprise the first time i hooked up a boost gauge and saw over 12psi the first time i hit the gas!!!
#7
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I have said this before but I think the UIM extra nipple is the worst point to T from. Insert the T where the MAP sensor reads so you can know what your ECU is doing and so you can get a more stable boost reading. I remember seeing the change on Rich's car with his Profec reading there and then moving it. His boost would oscillate till we moved it-after the move rock steady.
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Originally posted by spyfish007
I have said this before but I think the UIM extra nipple is the worst point to T from. Insert the T where the MAP sensor reads so you can know what your ECU is doing and so you can get a more stable boost reading. I remember seeing the change on Rich's car with his Profec reading there and then moving it. His boost would oscillate till we moved it-after the move rock steady.
I have said this before but I think the UIM extra nipple is the worst point to T from. Insert the T where the MAP sensor reads so you can know what your ECU is doing and so you can get a more stable boost reading. I remember seeing the change on Rich's car with his Profec reading there and then moving it. His boost would oscillate till we moved it-after the move rock steady.
#10
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I have said this before but I think the UIM extra nipple is the worst point to T from. Insert the T where the MAP sensor reads so you can know what your ECU is doing and so you can get a more stable boost reading. I remember seeing the change on Rich's car with his Profec reading there and then moving it. His boost would oscillate till we moved it-after the move rock steady.
BTW, my boost gauge is terriably inaccurate. When I thought I was running 13lbs on the non-seq twins, I was realy running 11! This was backed up by a dyno session with Ralph Friend. I just use it for a reference.
Last edited by pp13bnos; 04-07-04 at 08:46 AM.
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