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Old 04-30-2013, 02:27 AM   #1
Dtownbrown
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Default How much boost can I run with my TT setup???

Im currently Running 13psi in my twin turbo 99 c5, its currently making 722whp and Im wanting to go ahead and get closer to 900hp, My engine is a ls2 bored to a 408 stroker with the Lq9 heads, it is studded and torqued to around 90ft lbs, So my queston is how much boost could I safely run before I have to worry about lifting the heads, Im hoping to be able to atleast get 18psi safely. Im also spraying meth. And my CR should be around 9:1.

Mods-
408ci stroker / 4340 eagle crank, Eagle H beam rods, JE custom turbo pistons, Reverse split turbo cam,
RSI twin walbro 255 fuel system
82# injectors
HPP twin turbo kit w/ prescision billet wheel 62's
Twin nozzle methanol Injection
Ls6 intake w/ stock throttle body
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Old 04-30-2013, 02:38 AM   #2
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What gaskets are you using? Heck, even with the stock GM, with those head studs, you should have no problems with 18 psi.

If you are running the LS9 gasket...you will be able to handle more than that!
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Old 04-30-2013, 02:41 AM   #3
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I honestly cannot remember what brand gaskets im using, All i know is that they are steal gaskets. Maybe cometic?
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Old 04-30-2013, 03:15 PM   #4
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You are probably not going to have issues with 18psi. Detonation is what usually lifts the heads under 1000rwhp imo unless the heads have some thin spots.
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Old 04-30-2013, 04:00 PM   #5
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Quote:
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You are probably not going to have issues with 18psi. Detonation is what usually lifts the heads under 1000rwhp imo unless the heads have some thin spots.
Thin spots? As in, if they have been milled down and they were milled too much?
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Old 04-30-2013, 04:04 PM   #6
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Quote:
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Thin spots? As in, if they have been milled down and they were milled too much?
That will do it, but also just the way they are cast. Some heads, such as ls3's, have some thinner spots on the deck and don't clamp as well.
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Old 04-30-2013, 05:10 PM   #7
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Quote:
Originally Posted by Y2KRoadster View Post
Thin spots? As in, if they have been milled down and they were milled too much?
Boost is not what lifts heads. On a leakdown test, I put 100 psi into each cylinder. The heads haven't lifted yet.
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Old 04-30-2013, 05:25 PM   #8
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Quote:
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That will do it, but also just the way they are cast. Some heads, such as ls3's, have some thinner spots on the deck and don't clamp as well.
Ahh ok...your LS3 comment jogged my memory...I remember hearing about the deck on them being kinda thin.
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Old 04-30-2013, 10:55 PM   #9
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I've run 26psi on 4 bolt heads with 5/8 deck, and 9.25 compression. ARP studs at about 80 ft-lb. Stock GM MLS LS1 gaskets. No water pushed.
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Old 05-01-2013, 02:49 PM   #10
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How much power did you make with 26psi?
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Old 05-01-2013, 03:37 PM   #11
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1K at the wheels
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Old 05-01-2013, 03:37 PM
 
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