PLease help with this WTF issue
Nov 18, 2013 | 02:03 PM
#12
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TECH Apprentice
Joined: Sep 2012
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Your boost gauge should be reading from the manifold after the throttle body, or from the brake booster. The spike is from the throttle body slamming shut and creating a quick jump on the gauge before the blowoff opens. You may be making more boost than you think. I also think 5800 rpm is a low reference point. Centrifugal superchargers make more power with rpm. Calculate your impeller speed, and you should be able to get an idea how much CFM your moving.
I also bumped up the shift points to 6000 last night when I swapped the belt. I may take it out tonight and see what it's doing. I can swap in my vac/boost gauge that reads from the brake booster line and see if I get a different reading too but in 20+ years of owning turbo or otherwise boosted engines I've never gotten a false reading from the intake tract.
Nov 19, 2013 | 09:23 AM
#13
On The Tree
Joined: May 2013
Posts: 121
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From: Jennings LA
I understand where the spike is coming from.
I also bumped up the shift points to 6000 last night when I swapped the belt. I may take it out tonight and see what it's doing. I can swap in my vac/boost gauge that reads from the brake booster line and see if I get a different reading too but in 20+ years of owning turbo or otherwise boosted engines I've never gotten a false reading from the intake tract.
I also bumped up the shift points to 6000 last night when I swapped the belt. I may take it out tonight and see what it's doing. I can swap in my vac/boost gauge that reads from the brake booster line and see if I get a different reading too but in 20+ years of owning turbo or otherwise boosted engines I've never gotten a false reading from the intake tract.
Nov 19, 2013 | 03:27 PM
#14
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Joined: Sep 2012
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The valve opens via a vacuum signal when the TB closes. The boost gauge doesn't care where it gets a feed from...in every other vehicle I've ever built anyway. I'll put the vac/boost gauge back in this weekend and see if I note a difference...anything is possible.
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