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Boost Spiking??

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Old Nov 10th, 2015, 13:34   #11
brickman
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Would check your boost gauge against something known good/calibrate it too if you can. Most of the off the shelf ebay things for cars are not very accurate and can appear that spiking is occurring (or worse than it really is) as the needle doesn't respond that cleanly
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Old Nov 11th, 2015, 13:06   #12
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Quote:
Originally Posted by brickman View Post
Would check your boost gauge against something known good/calibrate it too if you can. Most of the off the shelf ebay things for cars are not very accurate and can appear that spiking is occurring (or worse than it really is) as the needle doesn't respond that cleanly
Exactly my thoughts as when i had my V70 T5 i wanted a guage that went to 2bar or 30psi as the just up to 20psi has a stop inside so therefore you think you could be on 20psi but you could be on 25psi!!

The 30psi gauge i received was faulty and was returned twice for others but still no good as they were no way near accurate.

So i decided on a digital one and it was excellent with also a battery conditioner built in so when starting you could see the state of the car battery.
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Old Nov 11th, 2015, 14:45   #13
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I use a comedy sized industrial gauge oil filled, reacts fast, accurate vs. works gauges upto its quoted 30psi (to within 0.5psi that I could detect), about £20 from most hydraulic suppliers?
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Old Nov 11th, 2015, 23:10   #14
0151rhys
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Does anyone have any recommendations on gauges which are not silly priced but reasonable, also I replaced themtcv today which made no difference.
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Old Nov 12th, 2015, 23:51   #15
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Thats mine, and placement, sits on a piece of sheet metal literally just pressfit into the gap between the blank switch covers and dashboard surround. in 18 months its never moved or come loose. Push fit pneumatic hose connection.

Can't remember the brand, and next time I'd prob go for the smaller diameter guage. Cost £17 inc vat from local hydraulic supplier.
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Old Nov 21st, 2015, 10:59   #16
t+m
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Thats a normal boost spike. The boost and revs rise together, then it changes gear and the lower revs means less air consumed so less boost, then the cycle repeats if you keep your foot down all the way to 150mph. You usually run out of road well before you get to max boost in top gear or even 3rd.
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