boost sag question
1 Attachment(s)
I have a boost sag problem. Boost is stable up to ~5500rpm. Then it steadily drops from ~12psi to ~9psi from 5500rpm to redline.
Attachment 191229 Hallman MBC is sourced just prior to TB. Full 3” exhaust with high flow cat Stock intake Bell cast manifold and DP Garrett 2554 with 6psi actuator Is this turbo just too small to keep boost up at the higher rpms? Or is the wastegate being pushed open? Do I need a helper spring or could it be something else? Thanks |
I would think that your wastegate is the issue, and either a stronger one or helper spring would be needed.
Not that this anything to do with it, but your injector DC sure does get high? |
Originally Posted by greenday3437
(Post 685953)
Not that this anything to do with it, but your injector DC sure does get high?
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Throw a new wastegate actuator at it. Something in the 10psi range should help.
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Yes.. I'm sure you know this already, but the ideal setup is to have a wastegate that holds closest to your target boost level. Then if you need a few more psi then use the boost controller to up it a few psi.
Not that people really do that, but most likely that's your problem. |
Originally Posted by greenday3437
(Post 686429)
Yes.. I'm sure you know this already, but the ideal setup is to have a wastegate that holds closest to your target boost level.
Would a helper spring effectively be the same as a new higher rate wastegate actuator, or no? |
Originally Posted by Slayer
(Post 686446)
Nope, didn't know that. But it makes sense. Thanks.
Would a helper spring effectively be the same as a new higher rate wastegate actuator, or no? It's a cheap way to fix the problem, but of course it's not the "most correct" way to do it. |
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