Supercharger Gauge Readdings ?
03-03-2009, 06:43 PM
#11
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Location: Northern Indiana
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Jersey: Brenspeed says there is no way I am hitting anything over 7 on boost with this kit, it has a 3.8 pulley I think whatever the stock Saleen 475 kit offers, think the gauge is off.
moosestang: self install. Seems to run completely fine, just the fuel pressure is all over the place. Vacuum at idle is about -10 Brenspeed says I don't need BAP or anything for this kit, I assume they have lots of experience with it and know. They also said as long as my a/f is ok, don't worry about the fuel pressure. And that I would see as low as 12 in some circumstances, and I have for very short time
Car has not been dyno'd.
Manual trans.
moosestang: self install. Seems to run completely fine, just the fuel pressure is all over the place. Vacuum at idle is about -10 Brenspeed says I don't need BAP or anything for this kit, I assume they have lots of experience with it and know. They also said as long as my a/f is ok, don't worry about the fuel pressure. And that I would see as low as 12 in some circumstances, and I have for very short time
Car has not been dyno'd.
Manual trans.
03-03-2009, 07:15 PM
#13
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Location: Northern Indiana
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I think I just got the boost sensor and aeroforce reading figured out. I have the 2 bar gm sensor. I set the slope to 6.0 and intercept to -14.7. Key on motor off indicates -1.0 psi. The reason why is maf sensor output voltage is 2.27 volts powered up with no vacuum or boost. Max pressure (2 bar total or 1 bar over sea level) outputs 4.9 volts and 14.7 psi (29.4 with a 0 intercept). In order to get a true 0 psi reading with the aeroforce we would need 2.45 volts (half of 4.9 max) instead of the 2.27 actual output.
In a nutshell I think the gm 2 bar sensor just doesn't have the correct voltage output range for the aeroforce gauge to be correct from 0 to max boost. Since I'm most interested in max boost I decided to calibrate the reading to be most accurate at the top instead of at 0 per the directions.
I'm going to try to find a map sensor with a 0 psi point that starts at 2.26 volts. I wonder if the gm 3 bar does?
In a nutshell I think the gm 2 bar sensor just doesn't have the correct voltage output range for the aeroforce gauge to be correct from 0 to max boost. Since I'm most interested in max boost I decided to calibrate the reading to be most accurate at the top instead of at 0 per the directions.
I'm going to try to find a map sensor with a 0 psi point that starts at 2.26 volts. I wonder if the gm 3 bar does?
03-03-2009, 07:22 PM
#14
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Location: Gainesville, FL
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I would get a manual boost gauge to confirm your numbers. The manual gauge will be way more acurate than an electronic gauge with map sensor.
Vacuum at idle should be 20+.
You have a wide band?
Vacuum at idle should be 20+.
You have a wide band?
03-03-2009, 07:23 PM
#15
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test run recorded.
vac/boost-----fuel Press-----fuel pump DC-----maf lbs
6.7-----------33------------45---------------51.73
7.2------------30.1----------31---------------17.65
4.4-----------54.3-----------26---------------3.48
-9.9----------65.5-----------35---------------14.65
5.6-----------25.6-----------44---------------57.11
.8------------58.4-----------23---------------3.5
0.o-----------37.2-----------39---------------40.09
7.6-----------24.4-----------42---------------40.35
7,5-----------29.1------------48--------------49.84
-7.8---------70.2------------28---------------3.5
Does any off this make sense. While I say the two gauges are in sync, I don't know for sure how close the are, I just count how many readings I cycle thru and do the same on both gauges.
vac/boost-----fuel Press-----fuel pump DC-----maf lbs
6.7-----------33------------45---------------51.73
7.2------------30.1----------31---------------17.65
4.4-----------54.3-----------26---------------3.48
-9.9----------65.5-----------35---------------14.65
5.6-----------25.6-----------44---------------57.11
.8------------58.4-----------23---------------3.5
0.o-----------37.2-----------39---------------40.09
7.6-----------24.4-----------42---------------40.35
7,5-----------29.1------------48--------------49.84
-7.8---------70.2------------28---------------3.5
Does any off this make sense. While I say the two gauges are in sync, I don't know for sure how close the are, I just count how many readings I cycle thru and do the same on both gauges.
Last edited by Toy4Bob; 03-03-2009 at 07:30 PM.
03-03-2009, 07:28 PM
#16
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Yes I do have wideband, and that is what Brenspeed told me is all I should be worried about. it reads 14.7 +-.2 most time, with quick spikes rich and lean during heavy accel or deceleration.
03-03-2009, 07:43 PM
#18
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Ok, then I seem to be in the same ballpark. Did you ever research the aeroforce forums for info, the techs over there usually answer within a day. You should throw at them your figuring in you other post above
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