9.2 compression and ? Boost

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Jun 29, 2011 | 12:16 AM

buick_lsx

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9.2 compression and ? Boost

Been running 9 lbs on the stock motor with 10-1 compression...the new forged motor will be 9.2-1 compression...

How much more boost should that allow me to run on pump gas?

Jun 29, 2011 | 12:22 AM

kmracer

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intercooler? 91 or 93? what turbo/supercharger?

Jun 29, 2011 | 12:39 AM

buick_lsx

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93 octane, a/w intercooler, 75mm turbo

Jun 29, 2011 | 01:02 AM

kmracer

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playing it safe? 12-13. i woudlnt play with timing either.

if you wanna roll the dice you can probably do a couple lbs more. are you planning on hitting the dyno again?

Jun 29, 2011 | 01:41 AM

buick_lsx

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Yea, it'll be tuned on the dyno then track. Just trying to get an idea...13lbs would get me 700hp on pump and I'd be happy with that

Jun 29, 2011 | 01:43 AM

buick_lsx

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And yea, the timing won't change on pump gas. 609 to the wheels right now with just 15 degrees

Jun 29, 2011 | 01:48 AM

kmracer

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good luck! 15* should be very safe, even at 13.

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Jun 29, 2011 | 02:27 AM

kmracer

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exactly. i personally would rather tune on the dyno, get the torque/timing combo (mbt) along with a comforable boost level, and turn it down for pump. i wasnt sure if you were planning on running race gas or not.

are you tuning yourself?

Jun 29, 2011 | 02:56 AM

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buick_lsx

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It'll be tuned on pump, that'll be close to 700rwhp and then race gas will max the turbo out

Jun 29, 2011 | 02:57 AM

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buick_lsx

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Race gas might be for just 1 or 2 races a year plus dyno days lol

Jun 29, 2011 | 03:17 AM

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kmracer

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cool cool. have fun mang.

Jun 29, 2011 | 09:35 AM

#13

ChevyChad

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what heads and intake manifold? 15psi on stock restrictive heads is a LOT different than 15psi on nice flowing aftermarket heads. What size engine? Takes a lot more air to feed a 427 than a 347. This is why you need to look at total power rather than total boost.