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boost spikes

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Old 07-26-2007, 06:10 PM
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Cool boost spikes
Ok i have an external wastegate with a 9psi spring and i am spiking at about 10 -11 psi. What factors cause boost spikes?
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Old 07-26-2007, 06:17 PM
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Default Re: boost spikes
How do you have the vacuum line connected on the wastegate?
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Old 07-26-2007, 06:19 PM
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Cool Re: boost spikes
It is just a vacume line to the turbo.
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Old 07-26-2007, 06:28 PM
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Default Re: boost spikes
or your boost gauge is inaccurate.
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Old 07-26-2007, 07:12 PM
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Default Re: boost spikes
how many ports do you have on your WG?
how many of said ports are hooked up?

fyi: get your vac/pressure signal from the IM for better/more accurate boost control
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Old 07-27-2007, 06:01 AM
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Cool Re: boost spikes
Thanks for the tips guys, but what actualy causes spikes??
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Old 07-27-2007, 06:03 AM
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Default Re: boost spikes
Could be that the turbo is too small for the engine, wastegate is only going to do so much. My damn car spikes at 22#s.
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Old 07-27-2007, 09:19 AM
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Default Re: boost spikes
does your manifold have shitty wastegate placement?
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Old 07-27-2007, 10:47 AM
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Cool Re: boost spikes
Well to tell you the truth i wouldnt be positive on what shitty placement would be but my manifold is a log style Drag. The wastegate is placed on the far right runner.
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Old 07-27-2007, 11:13 AM
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Default Re: boost spikes
Small turbo, not enough exhaust, bad WG signal, bad WG spring, bad boost controller.

Lots of things can cause a spike.
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