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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

loss of power + high rpm

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Old 03-13-2011, 01:44 PM
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Default loss of power + high rpm
well, I noticed some loss of power with high RPM ..

car has boltons and cammed , not tuned.

what's the problem ?
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Old 03-13-2011, 02:03 PM
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many things could be wrong. springs, injectors, valve seats, worn rings, cam specs, etc....

more info is needed. also a tune is in order.
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Old 03-13-2011, 02:05 PM
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Did you have any problems before the upgrades. Did you check for codes? Dyno tune may help.
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Old 03-13-2011, 02:05 PM
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Originally Posted by nitrous2fast
many things could be wrong. springs, injectors, valve seats, worn rings, cam specs, etc....

more info is needed. also a tune is in order.

it idles fine , accelerates fine ,but after accelerating and reaching top rpm ,it becomes slower ...

I think it's called engine bogging !!

just cleaned the injectors

what's the first thing to check ?? take it to a dyno ?
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Old 03-13-2011, 02:07 PM
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Originally Posted by riceburnerZ28
Did you have any problems before the upgrades. Did you check for codes? Dyno tune may help.

I didn't check for codes , but I got check engine light for a minute or two right after starting the engine and then it goes off.
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Old 03-13-2011, 02:13 PM
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What exhaust are you running?
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Old 03-13-2011, 02:15 PM
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Originally Posted by nitrous2fast
What exhaust are you running?
flowmaster
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Old 03-13-2011, 02:16 PM
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Start with checking for codes. If you have access to a laptop you could datalog what the engine is doing while driving to pinpot the problem.
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Old 03-13-2011, 02:20 PM
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Originally Posted by Mohammed
flowmaster
longtubes? shorties? stock manifolds? Size of the cam?
at what rpm does it "bog"?
What size injectors?
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Old 03-13-2011, 02:20 PM
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When did you do your last tune-up?
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Old 03-13-2011, 02:26 PM
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Originally Posted by nitrous2fast
longtubes? shorties? stock manifolds? Size of the cam?
at what rpm does it "bog"?
What size injectors?

shorties,stock intake and injectors...

sorry i didn't check at what rpm..

i think i'll take it to the dyno this week
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Old 03-13-2011, 02:28 PM
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get the car tuned. you might be running lean. not good.
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