at idle, how much PSI should a boost gauge read ?
car --> 1997 850 T5/stock
Boost Pressure
Started by T5RacerV, Mar 30 2005 11:17 PM
6 replies to this topic
#2
orange850t
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Posted 30 March 2005 - 11:19 PM
QUOTE(86wagonkid @ Mar 30 2005, 07:17 PM)
at idle, how much PSI should a boost gauge read ?
car --> 1997 850 T5/stock
car --> 1997 850 T5/stock
like -10 psi or so. At idle the intake should be under vacuum.
95 855T Autumn Gold
151k, H&R, Bilstein, SAMCO, Green filter, Kenwood EZ500, MB Quart, JL Audio (soon), Amber Sidemarkers, New Evap(still no AC though).....
I HATE VIRGINIA INSPECTIONS!!!!!
151k, H&R, Bilstein, SAMCO, Green filter, Kenwood EZ500, MB Quart, JL Audio (soon), Amber Sidemarkers, New Evap(still no AC though).....
I HATE VIRGINIA INSPECTIONS!!!!!
QUOTE(Nebor @ Jul 4 2005, 04:16 PM)
... I mean, you must wake up in the morning and say to yourself, "I'm a fantastic carrot."
#3
bogelo
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Posted 31 March 2005 - 12:35 AM
QUOTE(86wagonkid @ Mar 30 2005, 05:17 PM)
at idle, how much PSI should a boost gauge read ?
car --> 1997 850 T5/stock
car --> 1997 850 T5/stock
I think it should be around 18-20mmHg or -6.8hkpa (bar). The unit is not PSI because it doesn't have any pressure, it's vacuum.
YOU ->
<- ME95 850 Turbo - white brick
Mods: Greddy Profec B spec I EBC, Samco turbo hoses kit, Blitz DTT DC-II, Euro-spec headlight, Optima Red Top battery.
Audio: Clarion VRX610 headunit, Clarion DPH7500z DSP, Clarion CDC1255z 12-CD changer, McIntosh MC440, Zapco AG200, Nakamichi SP-S522 component speakers, Infinity reference 2-way speakers, nakamichi SP-W12 subwoofer, Phoenix Gold 4-Ga multi amplifier cable kit.
94 850 wagon - green brick
Mods: 8000K HID
#4
orange850t
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Posted 31 March 2005 - 12:47 AM
you are of course correct it converts to like 20-22 in Hg 
Can't have any fun wth the non tech types......
Can't have any fun wth the non tech types......
95 855T Autumn Gold
151k, H&R, Bilstein, SAMCO, Green filter, Kenwood EZ500, MB Quart, JL Audio (soon), Amber Sidemarkers, New Evap(still no AC though).....
I HATE VIRGINIA INSPECTIONS!!!!!
151k, H&R, Bilstein, SAMCO, Green filter, Kenwood EZ500, MB Quart, JL Audio (soon), Amber Sidemarkers, New Evap(still no AC though).....
I HATE VIRGINIA INSPECTIONS!!!!!
QUOTE(Nebor @ Jul 4 2005, 04:16 PM)
... I mean, you must wake up in the morning and say to yourself, "I'm a fantastic carrot."
#5
MrWinkey
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Posted 31 March 2005 - 12:50 AM
Actually at idle you have no boost, it's called vacuum my friend, it it should be anywhere between 17 and 22 or so depending on mods, cam profile etc. Perhaps you should read through the repairs and maintenance section a bit.
"SMOKE TROUT NOT CRACK"
#6
prasamin
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Posted 31 March 2005 - 02:17 AM
mine idle vac is at about 18psi with the mods listed below...this is with no KNOWN leaks, though I do have to do another hose replacement soon
#7
Bay13
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Posted 01 April 2005 - 12:01 AM
18 sounds good, if you slip the trans up to neutral it will drop down a bit as well.
