webcam 274 idle vacuum
06-05-2011, 05:35 PM
#1
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webcam 274 idle vacuum
Anyone running a webcam or any other sport cam in their 951? if so what is the idle vac? i am getting around 11 and that seems low. I do not think i have any vac leaks. replaced alot of vac if not all of them and i also presurized the system and did not find any.
thank
thank
06-05-2011, 08:44 PM
#2
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10-11 in/hg is normal for that cam.
06-05-2011, 09:48 PM
#3
Rennlist Member
I have the same cam ( in a box 
) for the past 6 yrs I am not going to install anythime soon ( Car has to pass smog )
How does it run ? A bit rough at idle ? Are there noticeable gains in the power ban ?
Over all thumbs up or down ?
Thanks in advance
Regards
Ed
) for the past 6 yrs I am not going to install anythime soon ( Car has to pass smog ) How does it run ? A bit rough at idle ? Are there noticeable gains in the power ban ?
Over all thumbs up or down ?
Thanks in advance
Regards
Ed
06-05-2011, 10:24 PM
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i did not put the cam in the car, but i know the previous owner and every time he made a change he would dyno the car so since he left it in i would have to think it had positive results.
from what i have read using a modified cam it lets boost escape the combustion chamber because of the overlap. that is just what i have read.
mine idles at 950 solid and you would not even notice it has a cam, but i have a link afm fuel controller and i tuned the idle to smooth it out
good luck ,
dave
from what i have read using a modified cam it lets boost escape the combustion chamber because of the overlap. that is just what i have read.
mine idles at 950 solid and you would not even notice it has a cam, but i have a link afm fuel controller and i tuned the idle to smooth it out
good luck ,
dave
06-06-2011, 01:43 AM
#5
Rennlist Member
i did not put the cam in the car, but i know the previous owner and every time he made a change he would dyno the car so since he left it in i would have to think it had positive results.
from what i have read using a modified cam it lets boost escape the combustion chamber because of the overlap. that is just what i have read.
mine idles at 950 solid and you would not even notice it has a cam, but i have a link afm fuel controller and i tuned the idle to smooth it out
good luck ,
dave
from what i have read using a modified cam it lets boost escape the combustion chamber because of the overlap. that is just what i have read.
mine idles at 950 solid and you would not even notice it has a cam, but i have a link afm fuel controller and i tuned the idle to smooth it out
good luck ,
dave
Best regards
Ed
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06-06-2011, 10:30 AM
#8
Nordschleife Master
Also be aware that just because you have an aftermarket boost gauge, doesn't mean it is 100% accurate.
Have one local car, with a VDO boost gauge tapped into the KLR line, indicates 10 PSI vacuum at warm idle. The electronic sensor we installed for his Zietronix indicates TRUE vacuum of 16ish at idle, 22 on decel. The AM gauge is not far off the boost reading +/- 1-2 PSI, but is WAY off on the vacuum reading.
Take a reading using a known good gauge (or electronic sensor, as I have yet to find one that lies), at the manifold to bet a real idea of how much vacuum / boost you are running!
Have one local car, with a VDO boost gauge tapped into the KLR line, indicates 10 PSI vacuum at warm idle. The electronic sensor we installed for his Zietronix indicates TRUE vacuum of 16ish at idle, 22 on decel. The AM gauge is not far off the boost reading +/- 1-2 PSI, but is WAY off on the vacuum reading.
Take a reading using a known good gauge (or electronic sensor, as I have yet to find one that lies), at the manifold to bet a real idea of how much vacuum / boost you are running!
06-06-2011, 10:54 PM
#9
Rennlist Member
06-06-2011, 11:02 PM
#10
Rennlist Member
Also be aware that just because you have an aftermarket boost gauge, doesn't mean it is 100% accurate.
Have one local car, with a VDO boost gauge tapped into the KLR line, indicates 10 PSI vacuum at warm idle. The electronic sensor we installed for his Zietronix indicates TRUE vacuum of 16ish at idle, 22 on decel. The AM gauge is not far off the boost reading +/- 1-2 PSI, but is WAY off on the vacuum reading.
!
Have one local car, with a VDO boost gauge tapped into the KLR line, indicates 10 PSI vacuum at warm idle. The electronic sensor we installed for his Zietronix indicates TRUE vacuum of 16ish at idle, 22 on decel. The AM gauge is not far off the boost reading +/- 1-2 PSI, but is WAY off on the vacuum reading.
!
I don't know if it's so much an issue of aftermarket gauges not being accurate; more likely the source of where it's tapped into; the slightest leak there can make a fair difference on the gauge.
