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06-07-2018, 08:56 AM
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#1 |
 
Drives: Black 2017 ZL1 Manual Transmission Join Date: Oct 2015
Location: Boise Idaho
Posts: 36
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Magnuson COG Over Drive Question
I am upgrading to a COG Over Drive setup for my Magnuson SC.
I am currently running a 3.4 inch pulley with the JRE tensioner with no slippage holding at 6.8 lbs of boost, headers, running at 11.6 commanded with FIC850 injectors. After I go to the COG OD I was planning on going to an 3.8 inc pulley, .640 lift camshaft, GM heads with upgraded exhaust valves, springs, seals, retainers, and to LS9 head gaskets. I was wondering what boost levels I would be running at that point, and what is safe with the stock rods, pistons, and block. Or, would I be better off to build another bottom end at that point? Please let me know your thoughts! |
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06-07-2018, 09:00 AM
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#2 |
  Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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The rear cog add 3lbs of boost roughly
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06-07-2018, 09:01 AM
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#3 |
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Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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But if you going back higher on front pulley then its probably defeating the purpose
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06-07-2018, 09:18 AM
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#4 |
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Drives: Black 2017 ZL1 Manual Transmission Join Date: Oct 2015
Location: Boise Idaho
Posts: 36
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Thank you for your responses
I have a 3.8, 3.6, and a 3.4. I could use any of them. I just wasn't sure what a safe boost level would be with my setup.
If I am understanding things correctly... The COG OD will increase my boost levels 3 lbs. That would put me at 9.8 lbs if I kept the same pulley.. The cam would drop me back down 1 lbs or so.. So, with the 3.4 pulley, I would be at 8.8 lbs? Is that a pretty close estimate, or would the cam drop if more then that? |
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06-07-2018, 09:21 AM
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#5 |
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Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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Yes and that boost level is fine for stock
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06-07-2018, 09:23 AM
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#6 |
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Drives: Black 2017 ZL1 Manual Transmission Join Date: Oct 2015
Location: Boise Idaho
Posts: 36
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Awesome! One more question
On a stock bottom end, what is considered safe boost levels, with upgraded head gaskets?
Weekend driver.. not daily.. |
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06-07-2018, 09:27 AM
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#7 |
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Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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Depending on the tuner 8-10
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06-07-2018, 09:34 AM
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#8 |
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Drives: Black 2017 ZL1 Manual Transmission Join Date: Oct 2015
Location: Boise Idaho
Posts: 36
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Gotcha
I keep mine around 11.6 commanded at WOT, 11.5 the richest, leanest I have gone is 11.7. I am within 1% or less difference at WOT. Zero knock.
I know some guys run their's at 12 with an SC.. not worth it in my mind.. I currently have it shift around 6200. I know that will change with the cam. Then the tuning fun begins again! Uggggg... Thanks for such speedy responses! |
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06-07-2018, 09:42 AM
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#9 |
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Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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Anytime, im at 20psi on my maggie on a 408 stroker lol
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06-07-2018, 10:29 AM
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#10 |
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Drives: Black 2017 ZL1 Manual Transmission Join Date: Oct 2015
Location: Boise Idaho
Posts: 36
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HOLLY CRAP!
How much RWHP do you have? What do you run for you command AF?
Should I just build a bottom end? |
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06-07-2018, 12:07 PM
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#11 |
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Drives: 2011 convertible 2ss/rs Join Date: Sep 2015
Location: Houston
Posts: 971
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850, forge is good, but took it back apart to port the lower manifold and raise compression
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