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^ piston rings wear over time causing blow-by (lower compression), carbon deposits, etc happens inside the engine no matter how well you maintain it. you're almost guaranteed to lose SOME power, regardless if your car has gone through all scheduled maintenance.
 
There's no clearcut answer to that. I guess it can be anywhere between 1-5% for a properly maintained car and between 5-25% for a poorly maintained one.
 
Discussion starter · #10 ·
i am sure my 2000 GT-S probably lost 15HP.
that's what got me thinking. a 2000 GT has 140hp originally, even with regular maintenance and garage kept now it'll only produce what, 100hp? 120hp? with these numbers it's pointless to put any performance modifications on it, even with a turbo and whatever it's still easier to just get a new car.
 
only way to really tell man is if you want to dish out 50-75 dollars every year to do a quick dyno run just to see how much power your losing,

but even a dyno result wont be very accurate, like my car will keep pulling and gaining more HP after every run until it starts to really heat up then drops and drops until im right back where i started which in all was a good 10 runs to reach max WHP and another 4 to see the same results from the very first run,

to many conditions man but 15 whp loss in 9 years could or could not happen, their are people who will blow an engine in 6 months man just ask my cousin.
 
a dyno run wouldnt prove anything either.

you would need to run it on the same dyno in the same condition before and after the 100,000 miles


At least a compression test before and after the 100K's might at least prove if any compression is actually lost
 
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