Blower size?
#11
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Is 5-6 psi going to get me to my 800-850hp goals though? Remember I am already making 600hp right now, but that's on 9.5:1. When we make the upgrade, heads will be coming back off for more extensive work and dropping comp ratio down into the 8:1 range. Would I be better off to run chillers, and then I can crank them on up to 8-9 pounds of boost, and Know I can achieve the hp goals?
#12
Is 5-6 psi going to get me to my 800-850hp goals though? Remember I am already making 600hp right now, but that's on 9.5:1. When we make the upgrade, heads will be coming back off for more extensive work and dropping comp ratio down into the 8:1 range. Would I be better off to run chillers, and then I can crank them on up to 8-9 pounds of boost, and Know I can achieve the hp goals?
I think getting to 850 hp without chillers on a 509 block is pushing your luck. 10-71 would probably be the best blower for it, if you can make it fit.
If you haven't torn down the motors yet, maybe don't drop the CR all the way down to 8:1. What block do you have? Can you punch it out for more cubes? If you could build a 540 or 572, you'd stand a better chance of getting 850 hp sans chiller. Like others said before, definitely aluminum heads.
Have you looked at using a Whipple intake manifold/cooler. I'm not sure if you can bolt a regular roots up to it, but it might be low profile enough. If the bolt pattern isn't the same, there are NC shops everywhere that can make anything.
#14
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With the chillers could I run 8-9 pounds boost and keep the steel heads, and make the 800-850 range? If I did run the chillers, I will be able to fit the 10-71's, and given the choice to run either 8-71's or 10-71's is the 10-71 the one to run with?
#15
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if the chillers wil fit under the hatch,run them,my 548,s with 8.71 and chillers at8 lbs boost made 950 hp on dyno,if i didn,t have chillers,id run them at 7 lbs boost.hope this helps.also.i had a 509 with ported iorn heads,8.1 comp,8.71 with no chiller,made 770 hp at 7 lbs boost.
#17
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Did some 509's with 8.5:1 comp, Canfield aluminum 350 cc runner out of the box head, not a real agressive solid roller, 8:71's, 4150 carbs, 7# and made 848 hp at 6000 on Zul's dyno for what it's worth. Never had any detonation issues.
#18
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My motors started life as 600SC's. They had cams installed, chillers, PFM blower drives, and 10 lbs of boost on 91 octane(only junk we have in Socal.) The motors make 800hp and i have put over 200hrs on them. The 10-71's will be able to do this with even less heat produced.
Darrell.
#19
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my 509 recipe was fairly simple. 8.2 to 1, 741 grind but double firing order swap roller cam, box stock edlebrock 6155 heads, chiller and a 420 blower at 8% overdrive. 902hp at 6000 after Crocket put a tune in the mefi.