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Is 10.5:1 compression too high?

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Old Apr 2, 2012 | 10:27 AM
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Default Is 10.5:1 compression too high?

I'm currently sitting at 11.4 compression on a N/A 408 and I'm thinking about adding a turbo. Maybe an S480 but I'm not sure. If I go the FI route, I would send my LS3 heads to Richard at WCCH and get them ported and opened up to 75cc chambers for a 10.5:1 compression change. Is that too high for a daily driver on boost?

I've never played with forced induction before so this is all new to me. Could I run 8-10 lbs saftely with a normal timing curve? Thanks guys
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Old Apr 2, 2012 | 11:32 AM
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Yes, it will be fine as long as you have good fuel.
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Old Apr 2, 2012 | 01:43 PM
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^ what he said. I'll be running 10.2:1 on pump gas 11psi I'm currently sitting at 9.5:1
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Old Apr 2, 2012 | 02:03 PM
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as long as fuel is good u should have no problem
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Old Apr 2, 2012 | 06:32 PM
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Sounds good guys. What turbo do you like for a daily driver 408, LS3 heads, 3200 stall converter?
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Old Apr 2, 2012 | 07:35 PM
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People always say good fuel, but in vegas you really gotta be watching for detonation as the weather changes. I do a lot of checks on the turbo cars as the weather warms up ( if the car doesn't have some sort of guage for monitoring AFR and knock youre kinda askin for it ) Tuning isn't hard but its gotta be done right.

Only takes a second to scan it and check it out. Hope to see the ride around with the Turbo setup!
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Old Apr 2, 2012 | 10:33 PM
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Yea I guess I should have specified that I'm in Vegas. It's gets damn hot here. With 10.5 compression, I was worried about the IAT's and timing. That's what I was asking about a normal timing curve.
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Old Apr 3, 2012 | 12:25 AM
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Meth + vegas is great. On front mount turbo cars Ive seen the underhood temps get high enough to start pre-boiling fuel. ( Thats always fun )
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Old Apr 3, 2012 | 12:31 AM
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When running meth, how often do you have to refill the tank?
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Old Apr 3, 2012 | 04:00 AM
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Originally Posted by oakley6575
Yea I guess I should have specified that I'm in Vegas. It's gets damn hot here. With 10.5 compression, I was worried about the IAT's and timing. That's what I was asking about a normal timing curve.
Hi Jake,

Ever hang out with the VegasLSX crowd? Come Check us out. We have another guy who just put a front mount turbo in his 2003 GMC Sierra 5.3.

VegasLSX

We meet at Town Square on Friday Nights, 7:30 pm, and at Cars n Coffee on Saturdays at around 8:00am.

See ya,
HRHohio (on this board)
(Bad Z28 on the VegasLSX board)
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