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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? |
How is it after 5800? |
You’ll prolly need to data log to see what’s going on. |
Originally Posted by Che70velle
(Post 20026163)
You’ll prolly need to data log to see what’s going on. 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 |
Carbureted or injected? |
It is fuel injected total stock 2002 SS |
Maybe time for new valve springs. |
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. |
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. |
Originally Posted by RockinWs6
(Post 20026385)
Maybe time for new valve springs. |
Thanks I will check on the vavle springs . |
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. |
Originally Posted by msystic27
(Post 20026298)
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 |
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 |
Originally Posted by msystic27
(Post 20026963)
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 I’d 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. |
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 ) |
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. |
Filter been changed got spark plugs to change does anybody know if the rev limiter work on 3/4 throttle or just full throttle? |
The rev limiter works anytime you approach redline. It sees RPM, not throttle position. |
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