Hey all, this is something that I've noticed for about three months now and its starting to really bug me. It hasn't been affecting my performance since its only at idle but I want to know if it is a problem waiting to start.
I dont know if its the cold weather or if its a hose that is unplugged or slightly loose then tightens as the engine warms up.
When I first start the car, whether its been sitting overnight or just one hour, my boost gauge reads at -20 in. hg at normal idle with all accessories off. After driving around about 10-15 minutes it reads at -22 in. hg. The reading doesn't fluctuate at all. When it's at -20 it stays there without any fluctuation at all. once warmed up it reads at -22 and stays there without any fluctuation. My idle is stable so I guess I can rule out a vacuum leak which self seals a hose with the heat of the engine. If that's even possible. This was a used block that I bought from my mechanic who I know for 20 years and is fully trustworthy. The motor was was and still is in great shape but this is just bugging me.
My set up is a 95 gsr stock internals with a jrsc at 11 psi very well tuned on a hondata s200b and a hondata intake manifold gasket. No fluid leaks, no weird hissing noises so whatever is happening might be slight. I've checked all my vacuum hoses and everything is snug and there are no leaks, otherwise my idle would be bouncing around since I tested it by loosening a clamp on one of the vacuum hoses. As soon as I loosened the clamp and slightly undid the hose just shy of where it connects to the idle started rising and dropping.
If anyone knows anything else I could look at it would be greatly appreciate it. Ideas and theories welcomed as to what could possibly cause this to happen. Maybe someone can look at their boost gauge and see if the same thing happens to them and it might ease my mind. Thanks in advance.
I dont know if its the cold weather or if its a hose that is unplugged or slightly loose then tightens as the engine warms up.
When I first start the car, whether its been sitting overnight or just one hour, my boost gauge reads at -20 in. hg at normal idle with all accessories off. After driving around about 10-15 minutes it reads at -22 in. hg. The reading doesn't fluctuate at all. When it's at -20 it stays there without any fluctuation at all. once warmed up it reads at -22 and stays there without any fluctuation. My idle is stable so I guess I can rule out a vacuum leak which self seals a hose with the heat of the engine. If that's even possible. This was a used block that I bought from my mechanic who I know for 20 years and is fully trustworthy. The motor was was and still is in great shape but this is just bugging me.
My set up is a 95 gsr stock internals with a jrsc at 11 psi very well tuned on a hondata s200b and a hondata intake manifold gasket. No fluid leaks, no weird hissing noises so whatever is happening might be slight. I've checked all my vacuum hoses and everything is snug and there are no leaks, otherwise my idle would be bouncing around since I tested it by loosening a clamp on one of the vacuum hoses. As soon as I loosened the clamp and slightly undid the hose just shy of where it connects to the idle started rising and dropping.
If anyone knows anything else I could look at it would be greatly appreciate it. Ideas and theories welcomed as to what could possibly cause this to happen. Maybe someone can look at their boost gauge and see if the same thing happens to them and it might ease my mind. Thanks in advance.
