LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Stock Heads cc306 Dyno Record Inside???

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Old Apr 9, 2007 | 05:00 PM
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zx1216's Avatar
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Stock Heads cc306 Dyno Record Inside???

Hey, i'm not claiming i have the record but last Friday my car put down a SAE corrected 366.48 rwhp and 368.29 rwtq on the stock heads and lower end with 199k miles on it The pulls were made on a dynojet 248c. Other mods are in my sig, the car was runing extremely lean across the board approaching 15:1 a/f ratio The dyno operator got out of it before 5k on the first pull since it was runing so lean. I can't believe i trapped 114 mph on this tune and the motor was still living. We added some fuel untill we got it around 13.2:1 and let it cool down to make one last pull. Uncorrected it made 380.58rwhp 382.46rwtq if anyone wanted to know, haha The before/after graph is attached, BTW thanks to my buddy Chris: Tqdrivenws6 for doing a great job tuning it. I'll post the video later when i have time. 11's here i come



Uncorrected



here is the video http://www.youtube.com/watch?v=D7oldCq96Os

Last edited by zx1216; Apr 9, 2007 at 10:53 PM.
Old Apr 9, 2007 | 05:03 PM
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DZNUTTS's Avatar
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nice.... w/ 199k damn!
Old Apr 9, 2007 | 05:05 PM
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Very impressive.
Old Apr 9, 2007 | 05:33 PM
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What were your shift points at the track? Stock gears?
Old Apr 9, 2007 | 05:39 PM
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i was shifting at about 6700 which looks a bit high looking at the dyno numbers, i have an excel spreadsheed i got from a friend i'll input the numbers into and i'll figure out the optimal shift points. As you can see in the first graph i'm working with 20-30 more ftlbs of torque across the board so that should help my 2.0 60' a lot
Old Apr 9, 2007 | 05:55 PM
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WOW! Not only did you install a cam on a high mile LT1 but you made awesome numbers too!! Truely inspiring to see someone run there high mile LT1 that high in the revs.

Is this a daily driver? I would love to cam my car but havent cause it has high miles.
Old Apr 9, 2007 | 05:59 PM
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6700 huh. Nice numbers Hope to have a 306 in my car this summer
Old Apr 9, 2007 | 06:07 PM
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In the summer the car is pretty much a daily driver, i'm thinking 6500 is a better shift point though.
Old Apr 9, 2007 | 06:08 PM
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I'm a little suprised to see the power start to bleed off so early with the cc306... I would have expected it to climb another 500RPM or so... Great numbers though, and that's actually a liveable RPM Range for a stock bottom end...
Old Apr 9, 2007 | 06:11 PM
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Remember this is on the stock heads so there is the restriction there, it seams to be pretty flat from 5800-6400 then drops off from there
Old Apr 9, 2007 | 06:30 PM
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Honestly I would wait to redyno it when the temps are around 60-80°F and see the corrected numbers then. At the ends of the temp range the correction factors are a little off. The raw numbers will be nice and high though, but I'm sure if you dyno later on say at 75° you will end up with lower corrected numbers, seen that before.

Bret
Old Apr 9, 2007 | 06:50 PM
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yeah i may throw it on again later this summer and see how it does
Old Apr 9, 2007 | 07:11 PM
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I wonder how long the stock bottom end will last spinning to 6500 rpm.
Old Apr 9, 2007 | 07:15 PM
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Originally Posted by buzz12586
I wonder how long the stock bottom end will last spinning to 6500 rpm.

Wonder that myself.
Old Apr 9, 2007 | 08:11 PM
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well, lol thats the funny thing, the car has about 50 passes on it, 20 on the cam and the previous tune runing a 14.5:1 a/f ratio, idk how it made it to the dyno myself, some tough engines...



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