Power down between 5500-5800 rpm - LS1TECH - Camaro and Firebird Forum Discussion

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Power down between 5500-5800 rpm

 
Old 01-05-2019, 08:33 PM
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Default Power down between 5500-5800 rpm

i have a 2002 ss that under full power fall flat on it face between 5500-5800 rpm in the lower gear . Do not have a clue , why?
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Old 01-06-2019, 12:01 AM
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How is it after 5800?
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Old 01-06-2019, 09:04 AM
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You’ll prolly need to data log to see what’s going on.
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Old 01-06-2019, 02:11 PM
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Originally Posted by Che70velle View Post
Youíll prolly need to data log to see whatís going on.
I do not have the ability to do that
and to the question what it like after 5800 rpm the power come back like gang busters all the way to rev limiter over 6000
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Old 01-06-2019, 03:15 PM
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Carbureted or injected?
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Old 01-06-2019, 03:18 PM
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It is fuel injected total stock 2002 SS
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Old 01-06-2019, 05:28 PM
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Maybe time for new valve springs.
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Old 01-06-2019, 07:08 PM
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There is only 12000 miles on it, there is no poping noise it is all quiet when this happens . I have complained to GM in the past about it.
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Old 01-06-2019, 07:14 PM
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Originally Posted by RockinWs6 View Post
Maybe time for new valve springs.
Springs only going flakey for a 400RPM window??? I doubt it...
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Old 01-06-2019, 07:14 PM
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Doesn't matter how little miles are on it..........its a good bet that's your trouble. At least check them for cracks or other problems.
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Old 01-07-2019, 01:00 PM
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Thanks I will check on the vavle springs .
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Old 01-07-2019, 01:49 PM
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I don't think a hole in performance between 5500 and 5800RPM is springs. They are not going to be bad ONLY between those speeds. 5500 and above, yes, but not in just that window of engine speed. I think it's something in either the ignition or injection.
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Old 01-07-2019, 06:33 PM
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Originally Posted by msystic27 View Post

I do not have the ability to do that
and to the question what it like after 5800 rpm the power come back like gang busters all the way to rev limiter over 6000
Id find a tuner that can do this for you. Your just guessing and throwing parts at it until then.
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Old 01-07-2019, 06:52 PM
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That is my plan . Could you hear ignition knock at 5500-5800? I will get it tuned but I wonder if the knock sensor is picking up ignition knock and pulling timing back
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Old 01-07-2019, 06:59 PM
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Originally Posted by msystic27 View Post
That is my plan . Could you hear ignition knock at 5500-5800? I will get it tuned but I wonder if the knock sensor is picking up ignition knock and pulling timing back
Depends on exhaust and other factors. Iíve seen improperly setup valvetrain cause the knock sensors to pull timing.
Iíd be more interested in the tuner logging everything to find the issues, than actually looking for more power, but why not kill two birds with one stone. Keep us posted.
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Old 01-07-2019, 07:25 PM
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Will keep informed
it totally stock ( black wing air intake and filter and daul daul exhaust and 3inch exhaust pipe. Slp called it the ( 345 hp kit )
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Old 01-07-2019, 08:16 PM
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Put a fuel filter on it and some dry gas in it.

I would also put new plugs and wires on it if they've never been replaced.
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Old 01-07-2019, 09:07 PM
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Filter been changed
got spark plugs to change
does anybody know if the rev limiter work on 3/4 throttle or just full throttle?
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Old 01-07-2019, 09:47 PM
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The rev limiter works anytime you approach redline. It sees RPM, not throttle position.
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