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91 RX7 FC loosing boost at 6k rpm

Old 03-29-17, 10:01 PM
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91 RX7 FC loosing boost at 6k rpm

I just rebuilt my motor like a month ago. I drove about 500 miles, changed the oil everything looked good, drove another 1500 before I actually got on it. Realized I had no boost after 6k! .___.
Has anyone experienced or have any idea what I can do? I already took nipple off for wastegate and same thing, swapped turbo out same thing, checked exhaust manifold no cracks, did a boost leak test found a leak on throttle body elbow fixing that soon, but if that doesn't fix it what else should I check?
Old 03-29-17, 10:49 PM
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is the wastegate ported or modified?

have a catalytic converter on the car still?
Old 03-30-17, 07:30 AM
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What was the boost before it dropped to 6PSI?
Old 03-30-17, 01:41 PM
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Originally Posted by RotaryEvolution
is the wastegate ported or modified?

have a catalytic converter on the car still?
Nope, all stock turbo and no cat
Old 03-30-17, 01:42 PM
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Originally Posted by Turbonut
What was the boost before it dropped to 6PSI?
6psi all the way till 6k rpm then drops slowly down
Old 03-30-17, 01:48 PM
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down to what and by what RPM? need figures, the stock boost gauge isn't very informative.
Old 03-30-17, 03:52 PM
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The S5 FC should see higher boost than 6PSI.
Wastegate dashpot working properly and rod connected?
Old 04-23-17, 06:18 PM
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Turbo is fine I've checked wastegate everything it boost great at low end once I hit 6k it stops. I got a fuel cut denfenser still didn't work. I'm going to try a manual boost controller than see what happens .-.


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