high mileage power loss????

**blackbird33** · 03-20-2007, 08:19 PM

me and a guy were talkin at the track the other day about how much power was lost on high mileage ls1's so i was wondering if anybody knew or possibly had some dyno numbers of a high mileage ls1

**9T8W66** · 03-21-2007, 01:13 PM

I dynoed my Car last Spring at 109,000 miles. Mods are SLP Lid, FRA & EGR Free mods, SOTL Flowmaster Catback and an Original Clutch
Numbers are from a Dynapack Dyno
300 RWHP @ 5300 rpm
322 RWTQ @ 4200 rpm
I realize these numbers are on the low side but the engine is tired.
I am the original owner and the car has felt stronger in the past but over the last 30k or so has softened up a bit. A new set of valvesprings would probably go a long way towards bringing back lost power. But why change valvsprings with out changing the camshaft as well !

**99blueZ** · 03-21-2007, 04:46 PM

not real high miles, but i have 78,000 and make good power

**stanger88** · 03-25-2007, 06:50 PM

Man, I started a thread on LS1tech.com JUST LIKE THIS! Here ya go...

http://ls1tech.com/forums/showthread.php?t=659775

**kams95ss** · 03-26-2007, 07:23 AM

I ran a 13.30 with 112,000

**blackSS01** · 03-26-2007, 07:41 PM

Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though

**ATCharming** · 03-26-2007, 07:53 PM

Originally Posted by blackSS01

Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though

thats alot of miles.

wow,

**joejenkinsglass** · 03-26-2007, 08:24 PM

Originally Posted by blackSS01

Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though

350xxx camaro/firebird im sure thats a rattle trap really would like to see/hear that car

**mikeaford** · 07-04-2007, 03:08 PM

I have now 130,xxx miles on mine 01 LS1 small cam minor stock head work dynoed at 350 RWHP. Not bad I am experiencing a rattle from the passenger side not a lose heat shield and I have tapped the cataluytic convertoer lightly with a rubber mallet nothing there??? I'm still looking there the original cats so I'm thinking maybe it's starting to clog - I've read somethings where that might cause it only happening in the 1800 to 2200 RPM range? But still going like a champ!