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2008 C6 M6 Stock Bottom End Heads/Cam Vs 427 shortblock with same heads/cam.. 2008 C6 M6 LS3 Original Modifications Include: TEA Stage I CNC LS3 Heads- Stock Valves/.650 lift dual spring kit Vengeance Racing Stage II LS3 Camshaft American Racing 1 7/8 Longtubes with catted X pipe MagnaFlow Catback Ported Throttlebody VaraRam Induction Stock Intake Stock clutch Stock Pulley Customer recently returned and decided to add some cubes Only change in the graph below is the addition of an LS3 427 shortblock Yella Terra Ultra Lite L92/LS3 Rockers http://i88.photobucket.com/albums/k1...scan0003-6.jpg http://i88.photobucket.com/albums/k1...g/C6427SAE.jpg http://i88.photobucket.com/albums/k1...g/C6427STD.jpg Idle Clip of 427 thru catted X pipe/MagnaFlow Catback http://www.youtube.com/watch?v=0uSJvipluP8 Part throttle drivability http://www.youtube.com/watch?v=bNTxYfmk54k Thru town with a short 1/2 blip http://www.youtube.com/watch?v=q2KWgS47R2Y |
Holy fuckin jump in the curve area batman. Nicely done. |
Must be a monster on the street with the curves shifted that far over...should be a great example of what happens when you add inches for those wondering, nice job. |
Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ? Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ?? |
One more thing, what was the compression on the LS3 Vs 427 ?? Any difference ?? |
Originally Posted by allngn_c5
(Post 10900746)
Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ? Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ?? When putting this motor together the customer did not care about topend power that is why he wanted cubes. When I assembled the engine I degreed the camshaft to do that per the request of customer. |
Well done guys! Nice vids. |
Originally Posted by Mike@Vengeance
(Post 10901379)
When putting this motor together the customer did not care about topend power that is why he wanted cubes. When I assembled the engine I degreed the camshaft to do that per the request of customer. |
what are the SAE numbers? My guess is they are a good 30-40rwhp difference on the lower side? 20 degrees does wonders for HP. |
You mean you wouldn't get STD numbers on your dyno sheet in 90 degree temps? |
Very nice comparison! I bet that's one happy customer! |
Originally Posted by VIPERBLUELX
(Post 10911856)
You mean you wouldn't get STD numbers on your dyno sheet in 90 degree temps? |
Wow, you're right! I read uncorrected on the sheet and for some reason equated that to STD numbers. So both SAE(the industry standard) and STD which is standard correction would both read quite a bit lower HP and TQ numbers than using uncorrected when it's really cold outside? Learn something new everyday! |
Originally Posted by allngn_c5
(Post 10900746)
Great comparison, can you explain why she seems to die so quickly above 6000 rpms and the original motor seems to still be making power ?? Whats the bottleneck on the 427 ? Either way there is so much more power under the curve the rapid fall off up top shouldn't even be a concern. At any rate what would be required on the 427 to keep the power building ?? |
Originally Posted by VIPERBLUELX
(Post 10911887)
Wow, you're right! I read uncorrected on the sheet and for some reason equated that to STD numbers. So both SAE(the industry standard) and STD which is standard correction would both read quite a bit lower HP and TQ numbers than using uncorrected when it's really cold outside? Learn something new everyday! Look here for how big the differences are in this weather, SAE and UNCORRECTED are both posted. SC weather is about on par with GA weather. https://ls1tech.com/forums/dynamomet...uer-v-3-a.html |
Don't forget pulling the smoothing back from 5 also increases the hp.:D |
im interested in the SAE numbers as well. Nice setup though. I bet thats gonna a fun car on the street with that neck snapping torque! |
He can just go to his computer and pull up the file switch it to SAE and repost the graph.:angel: |
Already done... Ill be posting after I get back from lunch. I have SAE and STD graphs so everyone can be happy ;) |
The increase in torque is the amazing part. 100+ extra ft lbs is a huge increase. |
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