what are your boost guages running in vacume?
#4
Originally Posted by rigga
on tickover mine reads negative pressure 20-25,on the overun it reads a little more,poss -30......would depend on the boost gauge though i think
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strange..... if its showing less boost but feels the same id say your gauge is playing up,as the difference in your previous readings and what you have now would, i think be easily felt as summat is not quite right.... same as the negative pressure differences you now have on tickover...... though is this all since you changed the motor spec or from before?
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iv just fitted a hks turbo timer that has a boost gauge at tickover it reads 0 and when you rev it it goes up to 2.7 its mesured in hg cm or something could i have plumbed it in wrong i cut the small pipe between the wastgate and boost selonoide and fitted a t peice and connected it there is this correct oh its a uk my99
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Originally Posted by struv
iv just fitted a hks turbo timer that has a boost gauge at tickover it reads 0 and when you rev it it goes up to 2.7 its mesured in hg cm or something could i have plumbed it in wrong i cut the small pipe between the wastgate and boost selonoide and fitted a t peice and connected it there is this correct oh its a uk my99
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thanks m8 i wasnt sure where to plumb it to but figured the boost solonoid would be getting a feed of presure maybe someone else can shed some light on this ???
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Think what is 'correct' depends on the specific gauges you have as different ones have different scales.
On my Greddy ones, when you turn the ignition ( but not the engine ) on, the needle goes to 0 - on idle it will show about -700 ( 0.7 bar I assume ) then will read out as normal as the boost increases.
If yours is showing the highest boost on tickover then there is definitely something wrong - might be worth getting a new gauge fitted if the car feels normal when accelerating.
On my Greddy ones, when you turn the ignition ( but not the engine ) on, the needle goes to 0 - on idle it will show about -700 ( 0.7 bar I assume ) then will read out as normal as the boost increases.
If yours is showing the highest boost on tickover then there is definitely something wrong - might be worth getting a new gauge fitted if the car feels normal when accelerating.
#17
Originally Posted by struv
iv just fitted a hks turbo timer that has a boost gauge at tickover it reads 0 and when you rev it it goes up to 2.7 its mesured in hg cm or something could i have plumbed it in wrong i cut the small pipe between the wastgate and boost selonoide and fitted a t peice and connected it there is this correct oh its a uk my99
As others have already stated for best results take the feed off the inlet manifold there should be a blanked off nipple for this or cut the vacuum hose that runs to the dump vavle and take from there.
As for vac readings all depends on your engine at what altitude you are as all its reading in the natural atmospheric pressure at what level you are at........14odd psi at sea level, remember your gauge is set up for reading boost and not really vacuum so would not really worry just as long as it's fairly accurate as the system goes positive.
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