Was boost on idle???
16 July 2002, 02:56 PM
#1
Scooby Regular
Thread Starter
Join Date: Sep 2000
Posts: 366
Likes: 0
Received 0 Likes
on
0 Posts
What should the boost gauge be reading on idle? Fitted one last night, when I turned the car on and let it idle the needle went down to -0.5 (cmHg?).
Took the car out and when on full boost it was peaking at almost 1bar and holding 0.8bar the rst of the time.
Does the idle value seem right and if not what might be causing it to read ok under pressure but not at rest?
Paul
Took the car out and when on full boost it was peaking at almost 1bar and holding 0.8bar the rst of the time.
Does the idle value seem right and if not what might be causing it to read ok under pressure but not at rest?
Paul
16 July 2002, 04:29 PM
#2
Scooby Regular
Join Date: Apr 2002
Posts: 394
Likes: 0
Received 0 Likes
on
0 Posts
There are a few threads about this, but your boost sounds pretty much spot on. My car idles negative too.
As far as I understand it when you're idling (out of gear) the engine only needs to generate enough power to turn the engine components, meaning there is little fuel burnt and consequently not much exhaust gas produced. No gas means no boost. The situation's similar under light throttle. Only when the engine needs to generate a lot of power, creating a lot of exhaust gas, will you see a positive boost reading.
As far as I understand it when you're idling (out of gear) the engine only needs to generate enough power to turn the engine components, meaning there is little fuel burnt and consequently not much exhaust gas produced. No gas means no boost. The situation's similar under light throttle. Only when the engine needs to generate a lot of power, creating a lot of exhaust gas, will you see a positive boost reading.
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
28
28 December 2015 11:07 PM
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
18 November 2015 07:03 AM