Boost Pattern: 9psi by ~6500, 8psi by 7000? is this normal?
#1
Avoiding the tree lane
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Boost Pattern: 9psi by ~6500, 8psi by 7000? is this normal?
Car just has hacked airbox w/ K&N dropin and downpipe, stock maincat/catback
#3
Avoiding the tree lane
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10-11 psi on the primary, spike to 11-12 psi at transition, solid 10.5-10.0 on the seconary, then falling to 9.0-9.5 by 6500 and 8.0-8.5psi @ 7000
#4
BOOOYAHHHH!
i have somewhat of a similiar problem.. my boost pattern is 10-6- 11/12 at transition then 7 psi.. im still trying to find out the issue. The general opinion is a clogged cat.
#5
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yep. clogged or clogging cat. remove the 2 bolts to the downpipe and shine a light in there to have a look. if it looks like clean fine mesh, all is good. if it looks like a hair clogged shower drain, it's melting/melted.
#6
Mr. Links
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Originally Posted by BoostFrenzy
10-11 psi on the primary, spike to 11-12 psi at transition, solid 10.5-10.0 on the seconary, then falling to 9.0-9.5 by 6500 and 8.0-8.5psi @ 7000
http://www.scuderiaciriani.com/rx7/boost_test.html
#7
Original Owner
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I agree with Mahjik - my stock 94 with 38,000 miles had a similar boost curve after I installed a downpipe: 11.5 psi on primary, spike to 11 after transition, then 9.5 psi to 6.5K and 8.5 psi at 7K.
I'm playing around with larger restrictor pills in the wastegate actuator hose in order to lower the spike at 5.5K because it causes boost cut in cold weather. I'm running a Holley 72 jet now and problem is much better, with no drop in boost above 6K.
I'm playing around with larger restrictor pills in the wastegate actuator hose in order to lower the spike at 5.5K because it causes boost cut in cold weather. I'm running a Holley 72 jet now and problem is much better, with no drop in boost above 6K.
Last edited by Retserof; 06-23-05 at 09:17 AM.
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