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Old 02-22-2018, 05:01 PM   #1
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How much Power can a Stock Bottom end L99 Handle

Just Curious if anyone has pushed an L99 bottom end to the breaking point? Found a Thread that was dead since 2013 figure someone might have pushed a motor to the max potential or what have we seen for power numbers?
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Old 02-22-2018, 05:38 PM   #2
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More power than the 6L80 transmission can take.
We've done 800+whp on them with high octane on turbos.
They are a pretty strong engine, usually held up because of trans limitations and octane. 6L90 swap and E85 and they will smoke a lot of cars on the road.

ETA-
You ask ab breaking point. All 8 rods bend at 20psi
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Old 02-22-2018, 10:57 PM   #3
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Just Curious if anyone has pushed an L99 bottom end to the breaking point? Found a Thread that was dead since 2013 figure someone might have pushed a motor to the max potential or what have we seen for power numbers?
610whp 700wtq reving it to 7k rpm, that was using a 150 shot of nitrous, when it let go it was just doing ramdom burnouts, not using nitrous, a rod let go and broke the oil pan and the block on both sides.

engine was 250k miles
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Old 02-22-2018, 11:01 PM   #4
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Test the limits to the point of breaking? I consider a safe barrier. Even the B-8 has recommended limits. If the plan is to get up there I would go forged.
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Old 02-23-2018, 06:00 AM   #5
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I've been running for several years with my mods without any issues. I have ~575hp. I do regular oil changes with Mobile 1 extended performance and haven't noticed anything abnormal with the used oil.
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Old 02-23-2018, 06:28 AM   #6
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i was told by my tuner that a safe level is about 650 max without overally stressing things
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Old 02-23-2018, 01:25 PM   #7
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Just Curious if anyone has pushed an L99 bottom end to the breaking point? Found a Thread that was dead since 2013 figure someone might have pushed a motor to the max potential or what have we seen for power numbers?
http://www.camaro5.com/forums/showth...=515855&page=3
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Old 02-23-2018, 02:43 PM   #8
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How much power does that thing make?
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Old 02-23-2018, 02:53 PM   #9
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How much power does that thing make?
Honestly We don't know, Moroso slide rule says 900 Crank, but it has never been on a dyno all tuning was done on the street and track remotely from my desk in CT, car is in Baton Rouge LA.
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Old 02-23-2018, 05:02 PM   #10
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Originally Posted by AGP Turbo View Post
More power than the 6L80 transmission can take.
We've done 800+whp on them with high octane on turbos.
They are a pretty strong engine, usually held up because of trans limitations and octane. 6L90 swap and E85 and they will smoke a lot of cars on the road.

ETA-
You ask ab breaking point. All 8 rods bend at 20psi
I like the sound of that 800+
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Old 02-23-2018, 05:21 PM   #11
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Originally Posted by Pro-tuned View Post
Test the limits to the point of breaking? I consider a safe barrier. Even the B-8 has recommended limits. If the plan is to get up there I would go forged.
Sorry think my question came off wrong I'm not trying to blow up the motor, I'm just curious how much power I can safely get out the motor until i can pull the funds together to build the short block. Ive only seen/hurd of a couple cars making high HP with a stock bottom short block PFA made 1000+rwhp, RPM has an ss making 930rwhp and LEP has camaro ss making 850rwhp. I figured with these motors being out for 10+ years someone might have a little data on what they can take or they like. My 2000 WS6 with a built 408 only make 500rwhp and I had a big hit of nitrous on it to get over 800rwhp

Last edited by nightdemon; 02-23-2018 at 05:55 PM.
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Old 02-23-2018, 05:53 PM   #12
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Originally Posted by nightdemon View Post
Sorry think my question came off wrong I'm not trying to blow up the motor, I'm just curious how much power I can safely get out the motor until i can pull the funds together to build the short block. Ive only seen/hurd of a couple cars making high HP with a stock bottom short block RPM has an ss making 930rwhp and LEP has camaro ss making 850rwhp. I figured with these motors being out for 10+ years someone might have a little data on what they can take or they like. My 2000 WS6 with a built 408 only make 500rwhp and I had a big hit of nitrous on it to get over 800rwhp
Biggest variable is the fuel used, people blow up on 600hp using shit pump gas. I've been making 800 on e85 for a year now
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Old 02-23-2018, 06:01 PM   #13
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Originally Posted by fif_gen_powa View Post
Biggest variable is the fuel used, people blow up on 600hp using shit pump gas. I've been making 800 on e85 for a year now
Thank you for your response 800+ thats great power. Have you had any issues with the transmission like the guy above was explaining? Do you race the car dig or roll?
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Old 02-23-2018, 06:03 PM   #14
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I have broken the diff axles and driveshaft doing dig races, roll racing has been fine
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