whats holding this back?
iron block 6.0L 365 ci 9.0 to 1 compression. stock gm crank. wessico pistons. callies rods arp rod bolts. ls9 head gaskets. tfs cnc 225 heads with arp studs. 23x/23x cam. st80 turbo. t4 1.10 ar 80mm compressor 83mm turbine with race cover. with meth and 93 oct. car is 3300 lbs th400 and a 3.27 gear with a 28" tire. i want this thing to run on full power for a local d/r class. what power can i safely make with a good tune
If you are looking to maximize your combo I would be running a t6 turbo. With a 1.1 t4 you will see some back pressure but heads lifting will be a problem before that boost number. To me, it still sounds like you could reach your goals on a production block with tfs heads.
Back pressure isnt one of those things that starts at a certain psi and becomes a instant problem. Turbo sizing is always a trade off...spool time vs hp. A smaller turbo will spool quicker, have more back pressure, and make less hp lb for lb(efficency come into play as well). Going with a well matched turbo and kit will go a ways in helping keep the combination happy.
As far as the heads lifting I have ran stock blocks and stock heads into the 800- 900 rwhp range without ever really lifting a head. I have taken a few apart that began to seep alittle at the bottom of the cylinder but never pressurized the coolant system.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 85
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im not really worried about the heads lifting. with ls9 gaskets, arp studs, and tfs heads i think they will stay down.
i am going up grade to a 87mm exhaust wheel. that will help reduce bp. ive seen this turbo make 1k flywheel as it sits now. but dont know what the bp was. but i feel like the bigger wheel will let me get 1050-1100 easyer
i am going up grade to a 87mm exhaust wheel. that will help reduce bp. ive seen this turbo make 1k flywheel as it sits now. but dont know what the bp was. but i feel like the bigger wheel will let me get 1050-1100 easyer
