how much rpm?
03-02-2005, 12:16 PM
#1
Staging Lane
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how much rpm? It is probably somewhere in the faq's but I don't have time to look right now. How much powwer and rpm can a stock ls1 bottom end handle? I have seen in magazines (apr '04 hotrod, where I found out about this site) go to 7000 or a bit more. Is this feasible? What about you guys...anyone with stock internals making big power and rpm? 
03-02-2005, 12:46 PM
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Well I would like to leave the bottom end stock for as long as possible while adding heads cam intake and gears and injectors. That is why I want to turn the rpm. Also how about boost? I have a 68 mm turbo that I need to start engineering onto something. I don't as of yet know the limits of the ls1 as gm produced it.
03-02-2005, 01:12 PM
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I'm doing H/C ..I think I'll set my R limiter to 6600-6800. I'm not taking it to the strip so how much is that exta 300-400rpm really worth? I'll settle for 99% of performance for a longer life span.
03-02-2005, 01:17 PM
#7
I have just a cam and it has seen 7000 RPMs thousands of times.
Sometimes the 7100 limiter.
Still runs just fine.
People have been telling me for 2 years that my motor won't last with
stock rod bolts.
I guess I have a hearing problem.
Sometimes the 7100 limiter.
Still runs just fine.
People have been telling me for 2 years that my motor won't last with
stock rod bolts.
I guess I have a hearing problem.
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03-02-2005, 01:21 PM
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The main reason that I ask is because I called comp about a turbo cam and the cam that they recommended is a 242, 244@.050 .610, .612 lift cam that will go to around 7200 rpm if I have the induction and fuel to run it efficiently at those rpm's. Will the hyper pistons and stock rods hold the boost?
03-02-2005, 01:25 PM
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yes...there's a guy up here who shifts at 7000 or maybe a little higher and sprays on top of it. His car is still together and he's been turning it that high for a couple of years now.
I think that people underestimate the abilities of the stock internals. As long as you hash out the drivetrain problems, you're golden. But for me personally I'm going to set my limiter at 7000 and shift around 6700 or so depending on what happens with my dyno after im tuned.
Nate
I think that people underestimate the abilities of the stock internals. As long as you hash out the drivetrain problems, you're golden. But for me personally I'm going to set my limiter at 7000 and shift around 6700 or so depending on what happens with my dyno after im tuned.
Nate
03-02-2005, 01:27 PM
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Originally Posted by 777
wow...i'm really suprised it has lasted so long...i wouldn't consider your car "normal" haha
Tell me... can you show me cars taht have fell apart because of high RPM...
What I mean to say is.. show me an Ls1 that moved his rev limiter to 7k and then blew his motor up because of the extra RPMs.
Go ahead.. show me one. And PLEASE Don't say you've seen someone do it or a friend did it.
Mine has been living on 7k since the cam. I have ARP Rod bolts and federal mogul rod bearings.
03-02-2005, 01:44 PM
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Nice...I am starting to feel confident that the factory bottom end will hold together at higher power levels and rpm. I love the cars that can run hard on factory parts...it shows people that you dont have to spend a ton of money to go fast.
03-02-2005, 02:04 PM
#12
Mine has been living on 7k since the cam. I have ARP Rod bolts and federal mogul rod bearings.
03-02-2005, 03:38 PM
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Originally Posted by 777
the rod bolts are quite a bit of help...but since you bring it up...distortion 69's car's engine blew up from revving it to 7,000...but whatever, i'm not hear to argue really, i just was saying what i have heard...and what i have heard is "rpm's kill motors", i don't see why you were so defensive and rude to me just because i stated something that i heard...that was definatly not necassary
LOL. distortion 69's lives 10 minutes from me.. good friend of his.
His car NEVER blew up. It is currently sitting at futral motorsports, engine intact, can crank it for you if you like.
He missed a shift, and bent a hell of alot of valves. And even that wasn't enough to stop him.
So please.. edit your post. His car never blew up or quit running at any time. Even with the bent valves it was outrunning my full bolt on car.
Why I am so defensive is because this board is full of people that only list facts based on what they have heard. If you have known.. or been around someone that has lost a motor from high RPM.. please post that rpms kill motors. Not that "thats what I've heard so thats what I am posting"
I've been around plenty of people with ARP rod bolts... and plenty of people with stock bottom end.. spinning to 7k and nothings happened to them.. so I am posting up with my story... and what I've experienced.
03-02-2005, 03:55 PM
#14
When the Gen III LS1 engines were first introduced in the Corvettes back in 1997, some of the GM engineers that designed the engine held a press conference. Someone from a car magazine asked this same question. The engineer said the engine could spin at 7,000 rpm all day with no problems. He said they red-lined it lower because they certify their factory engines to run 150,000 miles.
Having said that, I believe the newer LS1's have stronger rod bolts; so apparently GM knew that was their weakness.
As for my personal experiance, I set my rev limit at 6750 rpm, and bounced of it all last summer, racing at the track one or two times a month.
Having said that, I believe the newer LS1's have stronger rod bolts; so apparently GM knew that was their weakness.
As for my personal experiance, I set my rev limit at 6750 rpm, and bounced of it all last summer, racing at the track one or two times a month.
03-02-2005, 04:46 PM
#15
i'm going off of what HE TOLD ME...sorry if he told me wrong, but he said he set his rev limiter at 7k and took it there often and his motor blew...i don't think it was the car he has at futral right now...is it him or his brother that is getting the turbo?
and btw i guess that would certify my theory no? set the limiter lower for longer engine life...correct me if i'm wrong
and btw
He said they red-lined it lower because they certify their factory engines to run 150,000 miles.
03-02-2005, 04:57 PM
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Originally Posted by 777
i'm going off of what HE TOLD ME...sorry if he told me wrong, but he said he set his rev limiter at 7k and took it there often and his motor blew...i don't think it was the car he has at futral right now...is it him or his brother that is getting the turbo?
and btw i guess that would certify my theory no? set the limiter lower for longer engine life...correct me if i'm wrong
and btw i guess that would certify my theory no? set the limiter lower for longer engine life...correct me if i'm wrong
Wow.. I am really starting to wonder about your credibility.
He has only owned one 99 z28.. his family has only owned 1 LS1. His LS1 ran fine until the day he mis shifted and bent all his valves. Put new heads on it and it never ran with the same power, but they never figured out why. His motor was never "blown" up.
It is that same car that is getting the turbo now.
I've never seen a post on here from someones motor letting go because of RPM's.
I doubt I ever will.
03-02-2005, 05:01 PM
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Originally Posted by Cal
As for my personal experiance, I set my rev limit at 6750 rpm, and bounced of it all last summer, racing at the track one or two times a month.
03-02-2005, 05:35 PM
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I've got my rev limiter set at 6800rpms but my cam falls off after 6500 so there is no point in going any higher. Feel pretty safe at 6500rpms with the upgraded 01+ LS6 rod bolts.
03-02-2005, 05:47 PM
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Originally Posted by 777
actually i have a better idea...go outside rev your engine to 10,000rpms and see what happens...then tell me that rpm's didn't kill your motor...
I would... but a little thing called common sense... and the fact that you can't rev an ls1 past 7200 via PCM limitations would prevent that.