Boost Gauge Needle Bouncing At High Boost
01-17-2007, 11:41 AM
#1
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Boost Gauge Needle Bouncing At High Boost
So guess my car has sort of always been this way. But when I go WOT 3rd or 4th gears and I am up around 25-26 PSI..the boost gauge needle bounces rapidly 1-2 PSI. Wondering if this is normal or if it is something like wastegate creep or WGFV funkyness? My BPV is a Hyperboost with the pressure hitting the "side" of the piston.
Thx
cp
Thx
cp
01-17-2007, 12:00 PM
#3
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Different N75s actuate at different frequencies. You could try one of the better ones?
I forget which one's the best. There's a site somewhere that says.
Not sure what else it could be...
Not sure what else it could be...
01-17-2007, 01:38 PM
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I ran a MBC for a while.
They're no good. Yes, boost came on stronger and earlier, but it was risky. And, it tended to spike a lot. A nice electronic boost controller might help, but I think good software an a nice VMAP do it best.
01-17-2007, 02:14 PM
#7
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I am putting in 034efi's N75 Valve and will report back
<ul><li><a href="http://www.034motorsport.com/product_info.php?products_id=480">http://www.034motorsport.com/product_info.php?products_id=480</a</li></ul>
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01-17-2007, 04:36 PM
#8
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did you check the bpv for leaks?
my car was doing the same thing.... turned out the forge DV was leaking at around 23-24 psi.
got a free rebuild kit from forge and all was good after that.
got a free rebuild kit from forge and all was good after that.
01-17-2007, 09:25 PM
#10
Sigh ... the diagram is for an MBC in PARALLEL with the WasteGate - it will not boost higher
This method only allows clamping the boost below the peak as set by the ECU-boostcontroller through the N75 wastegate controller.
It is not possible to increase final boost with this method.
I would not recommend using an MBC only, since it only allows setting the maximum boost. Using an EBC such Apexi AVC-R is a much better solution if you want to get around the N75 completely.
It is not possible to increase final boost with this method.
I would not recommend using an MBC only, since it only allows setting the maximum boost. Using an EBC such Apexi AVC-R is a much better solution if you want to get around the N75 completely.
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