Boost pressure - Page 2

Pedro Fandango · Jan 2nd, 2006, 18:17

perhaps someone else can help, i don't know what year they started fitting them so can't say if its been removed or wasn't there to start with. My 94 never had it but sure i've seen them on 96's (sorry i can't help any more)

bigandquick · Jan 2nd, 2006, 23:18

Certainly the '96/7 models have the tamper proof restraining straps.
Does sound like the guage is dodgy. What position is the needle in with engine off?

JCT5R · Jan 2nd, 2006, 23:31

The needle is at the bottom of the guage with the engine switched off.
The non-shaded section.
The needle seems a lot closer to the shaded part when driving sedately than it used to on my old T5 that i used to have ???????????

bigandquick · Jan 3rd, 2006, 13:16

Sounds like your gauge or the connections to it are faulty. My boost gauge sits dead centre at 12 o'clock with the engine off, as have the gauges in other Volvos I've owned. I believe it represents manifold pressure. So with your foot off the throttle and coasting there will be negative pressure in the manifold, whereas with your foot down the pressure is positive. It leads then that with the engine off the pressure is atmospheric so the needle should be centre. That's my understanding anyway.

JCT5R · Jan 3rd, 2006, 17:35

I have just checked as to where the turbo boost needle is in the guage when the ignition is turned off and its dead centre,12 o/clock position !!!
Sorry,my mistake.
Any ideas ?????
Sheepish John.

Jan 2nd, 2006, 23:18	#12
bigandquick Premier Member Last Online: Mar 18th, 2024 12:36 Join Date: Dec 2003 Location: Cambridge	Certainly the '96/7 models have the tamper proof restraining straps. Does sound like the guage is dodgy. What position is the needle in with engine off? __________________ Tim '16 XC60 SE Lux Nav

Jan 2nd, 2006, 23:31	#13
JCT5R Member Last Online: Jun 9th, 2012 15:49 Join Date: Dec 2005 Location: Essex	Boost guage The needle is at the bottom of the guage with the engine switched off. The non-shaded section. The needle seems a lot closer to the shaded part when driving sedately than it used to on my old T5 that i used to have ???????????

Jan 3rd, 2006, 13:16	#14
bigandquick Premier Member Last Online: Mar 18th, 2024 12:36 Join Date: Dec 2003 Location: Cambridge	Sounds like your gauge or the connections to it are faulty. My boost gauge sits dead centre at 12 o'clock with the engine off, as have the gauges in other Volvos I've owned. I believe it represents manifold pressure. So with your foot off the throttle and coasting there will be negative pressure in the manifold, whereas with your foot down the pressure is positive. It leads then that with the engine off the pressure is atmospheric so the needle should be centre. That's my understanding anyway. __________________ Tim '16 XC60 SE Lux Nav

Jan 3rd, 2006, 17:35	#15
JCT5R Member Last Online: Jun 9th, 2012 15:49 Join Date: Dec 2005 Location: Essex	My mistake I have just checked as to where the turbo boost needle is in the guage when the ignition is turned off and its dead centre,12 o/clock position !!! Sorry,my mistake. Any ideas ????? Sheepish John.

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Jan 2nd, 2006, 18:17	#11
Pedro Fandango I've Been Banned Last Online: Apr 2nd, 2015 16:12 Join Date: Dec 2002 Location: can't remember	perhaps someone else can help, i don't know what year they started fitting them so can't say if its been removed or wasn't there to start with. My 94 never had it but sure i've seen them on 96's (sorry i can't help any more)

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