A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

with APR chip boost seems to be spiking right when turbo kicks on...

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Old 10-05-2002, 11:11 AM
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Default with APR chip boost seems to be spiking right when turbo kicks on...

what could this be? I have the 91 octane chip and a apr exhaust and a turbo XS type H... could it be boost leak from the bpv? or could it be the apr chip? or could it be I need a manual boost controller on top of the chip? help... also, is this bad for my engine?
Old 10-05-2002, 11:46 AM
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Default Re: with APR chip boost seems to be spiking right when turbo kicks on...

ussually a leak, bad bpv, wastegate probs. . . low boost just makes it run more rich (rich is good altho, it will slow it down
Old 10-05-2002, 11:50 AM
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Default Re: with APR chip boost seems to be spiking right when turbo kicks on...

if you have a bov, how can you have a bpv?
when i had a leak,but might have a differnt leaking problem, i wouldt boost as high. so, im thinking your running rich with the bov or something is stuck.
if you had on a bpv, the bpv could be getting stuck, or your vag line is leaking.
so it could be any of these.
Old 10-05-2002, 01:32 PM
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Default Most K03 chips have a slight boost spike when you first go wot

it will even be a little higher under a load. It will spike high then settle back down and hold till around 5K rpms where it will start to drop in boost. K03 cant hold 1.1+ bar to redline.
Old 10-06-2002, 12:26 AM
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Default what he said, plus...

if it spikes while rpm's are climbing then it's BPV.
Old 10-06-2002, 07:14 AM
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Default BPV is always closed during WOT and it does not control the boost

if the boost spikes real high while the rpms climb it is the wastegate that is not opening.
Old 10-06-2002, 01:10 PM
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Default Re: BPV is always closed during WOT and it does not control the boost

what should i do to check the wastegate? also what are some nice aftermarket wastegates that can handel extra boost?
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