LS2 Redline question
Thread Starter
Instructor
Joined: Jun 2005
Posts: 155
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From: Brooklyn Park MN
LS2 Redline question
Greetings from the C5 forum. 
I currently have a LS2 402 stroker with an AFR top end in my C5. I currently have the revlimiter set to 6500 RPM. My question is, it is safe to spin the LS2 on all forged internals to 7000 RPM? The reason for this is that the X2 cam is still making power past 6500 RPM. Any info would be great.
Steve.
I currently have a LS2 402 stroker with an AFR top end in my C5. I currently have the revlimiter set to 6500 RPM. My question is, it is safe to spin the LS2 on all forged internals to 7000 RPM? The reason for this is that the X2 cam is still making power past 6500 RPM. Any info would be great.
Steve.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
the LSx motor is good for 9000 rpms for an extended period of time. However, not a really good idea as that was for durabitly tests.
7100-7500 can be done with out a problem. Do a good dyno tune.
Sevel ppl have gone to 7500 but really never drive it above 7100.
The biggest challange is the stock timing chain. With your cam and head change I guess you changed to a better timing chain as well.
Good Luck
7100-7500 can be done with out a problem. Do a good dyno tune.
Sevel ppl have gone to 7500 but really never drive it above 7100.
The biggest challange is the stock timing chain. With your cam and head change I guess you changed to a better timing chain as well.
Good Luck
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Originally Posted by SteveDR425
Greetings from the C5 forum.
I currently have a LS2 402 stroker with an AFR top end in my C5. I currently have the revlimiter set to 6500 RPM. My question is, it is safe to spin the LS2 on all forged internals to 7000 RPM? The reason for this is that the X2 cam is still making power past 6500 RPM. Any info would be great.
Steve.
I currently have a LS2 402 stroker with an AFR top end in my C5. I currently have the revlimiter set to 6500 RPM. My question is, it is safe to spin the LS2 on all forged internals to 7000 RPM? The reason for this is that the X2 cam is still making power past 6500 RPM. Any info would be great.
Steve.
Thread Starter
Instructor
Joined: Jun 2005
Posts: 155
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From: Brooklyn Park MN
Originally Posted by AU N EGL
the LSx motor is good for 9000 rpms for an extended period of time. However, not a really good idea as that was for durabitly tests.
7100-7500 can be done with out a problem. Do a good dyno tune.
Sevel ppl have gone to 7500 but really never drive it above 7100.
The biggest challange is the stock timing chain. With your cam and head change I guess you changed to a better timing chain as well.
Good Luck
7100-7500 can be done with out a problem. Do a good dyno tune.
Sevel ppl have gone to 7500 but really never drive it above 7100.
The biggest challange is the stock timing chain. With your cam and head change I guess you changed to a better timing chain as well.
Good Luck
Hmmm.... I don't remember upgrading the timing chain
. I sent an email to Randy at DRM to find out if the stock Ls1 timing chain is still in my car. Anyone have any idea how long it takes to swap out the timing chain with an upgraded one? 
I am guessing a double roller chain is the best one to go with.
Thread Starter
Instructor
Joined: Jun 2005
Posts: 155
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From: Brooklyn Park MN
Originally Posted by haljensen
Rev limiter is already set @ aprx 6700RPM on the LS2 from the factory. The red LINE is an arbitrary number asigned by an engineer. The Z06 rev limit is above 7000RPM so if you have faith in your bottom end and valve train 7000RPM shouldn't be a problem.
The bottom end is completely forged and the valve train is upgraded as well..
Race Director
Joined: Sep 1999
Posts: 12,439
Likes: 920
From: CONCORD NC
Actually Katech did some of GM's durability testing, and the stock parts are good for 6900rpm (01-newer, 97-00 only 6500rpm).
I run my forged race engines to 7500rpm, but they are NOT stoker motors. You should clear this with the rod manufacturer, but I would expect 7500rpm to be safe if the stock powdered rods are good to 6900...
I run my forged race engines to 7500rpm, but they are NOT stoker motors. You should clear this with the rod manufacturer, but I would expect 7500rpm to be safe if the stock powdered rods are good to 6900...
Thread Starter
Instructor
Joined: Jun 2005
Posts: 155
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From: Brooklyn Park MN
Originally Posted by davidfarmer
Actually Katech did some of GM's durability testing, and the stock parts are good for 6900rpm (01-newer, 97-00 only 6500rpm).
I run my forged race engines to 7500rpm, but they are NOT stoker motors. You should clear this with the rod manufacturer, but I would expect 7500rpm to be safe if the stock powdered rods are good to 6900...
I run my forged race engines to 7500rpm, but they are NOT stoker motors. You should clear this with the rod manufacturer, but I would expect 7500rpm to be safe if the stock powdered rods are good to 6900...
Thanks for the info.
I have 6.125 Eagle H-beam rods on the stroker right now. So, if the stock rods can handle 6900 RPM, I am sure Eagle rods will easily handle a 7100 or 7200 RPM. I think my timing chain is my only weak point right now which needs to be replaced. However, I don't think it’s a big deal to upgrade to a better one....
Former Vendor
Joined: Feb 2004
Posts: 9,615
Likes: 13
From: Burlington NC
Steve,
Come by some day if it's not snowing and we will raise the rev limiter. We installed the chain that came with the SLP 402 kit. I think it's a stock LS2 chain. RPM is what kills motors! Lets keep it down to maybe 6900. Anything over that and you can have problems. By the way race motors get rebuilt all the time so spinning isn't a problem.
Randy
Come by some day if it's not snowing and we will raise the rev limiter. We installed the chain that came with the SLP 402 kit. I think it's a stock LS2 chain. RPM is what kills motors! Lets keep it down to maybe 6900. Anything over that and you can have problems. By the way race motors get rebuilt all the time so spinning isn't a problem.
Randy
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Thread Starter
Instructor
Joined: Jun 2005
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From: Brooklyn Park MN
Originally Posted by Randy@DRM
Steve,
Come by some day if it's not snowing and we will raise the rev limiter. We installed the chain that came with the SLP 402 kit. I think it's a stock LS2 chain. RPM is what kills motors! Lets keep it down to maybe 6900. Anything over that and you can have problems. By the way race motors get rebuilt all the time so spinning isn't a problem.
Randy
Come by some day if it's not snowing and we will raise the rev limiter. We installed the chain that came with the SLP 402 kit. I think it's a stock LS2 chain. RPM is what kills motors! Lets keep it down to maybe 6900. Anything over that and you can have problems. By the way race motors get rebuilt all the time so spinning isn't a problem.
Randy
Thanks for the info Randy.. I will have to stop by in April, because the car is currently in storage.
