dyno tuning?
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Joined: Jul 2004
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From: A forum with actual tech
Originally Posted by westcoaststyle
Well.... secondly, the bc controls boost, but first and foremost the wastegate is your boost controller. The wastegate is what essentially controls boost by the tension of the spring inside of it (external WG). If you don't have a boost controller at all then the boost is totally controlled by the WG. This works by the amount of pressure that builds up from the exhaust ports on your head into the turbo. Once the pressure reaches a certain PSI (or BAR), the WG spring can no longer keep the WG closed so it opens, allowing the extra pressure to bleed off either to a section of exhaust piping after the turbo or to open atmosphere.
When using a manual or electronic boost controller, you can boost up to approximately four times the installed WG spring PSI rating - I was able to hit 16 psi on my 4 psi spring and upgraded to a 10 psi spring. These extra boost controllers work off of vacuum/boost pressure and hold the wastegate closed so that more pressure is able to build, thus creating more boost pressure.
It's a lot to digest, but I hope I've enlightened you a bit.
When using a manual or electronic boost controller, you can boost up to approximately four times the installed WG spring PSI rating - I was able to hit 16 psi on my 4 psi spring and upgraded to a 10 psi spring. These extra boost controllers work off of vacuum/boost pressure and hold the wastegate closed so that more pressure is able to build, thus creating more boost pressure.
It's a lot to digest, but I hope I've enlightened you a bit.
The wastegate has a vacuum hose connected to it so when the pressure in the intake manifold (boost) reaches the wastegate's spring rating, air flowing through the vacuum tube opens the wastegate and allows exhaust gas to bypass the exhaust turbine. The exhaust gas pressure has nothing to do with the regulation of the boost, but rather the intake manifold pressure.
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Joined: Sep 2000
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From: CO
AH! That's what I meant, I don't know why I said it the other way. lol
It wasn't making sense while I was typing it, but I kept going.
One of those brain farts, I suppose. Thanks for the correction Shmoo. :goodjob:
It wasn't making sense while I was typing it, but I kept going.
One of those brain farts, I suppose. Thanks for the correction Shmoo. :goodjob:
On permanent hiatus
Joined: Jul 2004
Posts: 9,716
Likes: 0
From: A forum with actual tech
Originally Posted by westcoaststyle
AH! That's what I meant, I don't know why I said it the other way. lol
It wasn't making sense while I was typing it, but I kept going. One of those brain farts, I suppose. Thanks for the correction Shmoo. :goodjob:
It wasn't making sense while I was typing it, but I kept going.
One of those brain farts, I suppose. Thanks for the correction Shmoo. :goodjob: