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10-08-2009, 11:40 AM
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#31
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by 94cobra69ss396
No. Your car wouldn't make power up in the higher rpms due to it running lean so it would feel like it was running flat. If you are still feeling this now that the AFR is correct then I'd say you don't have enough valve spring pressure.
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But if it does pull harder past 6K, it might have just been the AFR?
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I <3 forced induction.
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10-08-2009, 11:43 AM
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#32
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Btw Ben, you already have a pretty big cam for having just ported heads, I just looked last night. You might not gain anything, depends on how big your heads were ported.
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I <3 forced induction.
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10-08-2009, 01:10 PM
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#33
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by enkeivette
Btw Ben, you already have a pretty big cam for having just ported heads, I just looked last night. You might not gain anything, depends on how big your heads were ported.
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The cam is pretty moderate.
224/224 114LSA
The ports are huge, supposedly 305cfm. 
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10-08-2009, 02:06 PM
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#34
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Vettezuki
The cam is pretty moderate.
224/224 114LSA
The ports are huge, supposedly 305cfm. |
305 cfm flow are Big Block numbers. 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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10-08-2009, 02:14 PM
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#35
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by BRUTAL64
305 cfm flow are Big Block numbers. |
Like I said, this motor with an LS1 intake (I have an LS6) and headers made 432 on an aggressive tune in the car it came out of. I don't think the driveline loss is so much higher on a C3 than a C5 (if at all), so with some headers and a good tune, I should be at least back to 430, maybe higher. Just speculation until it's done.
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10-08-2009, 03:01 PM
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#36
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Senior Member
Join Date: Jun 2009
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I think its just your a/f is out of whack.
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Boost, because sometimes atmospheric pressure just isn't enough.
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10-08-2009, 03:03 PM
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#37
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by Damian
I think its just your a/f is out of whack.
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Looks pretty good on the dyno.
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10-08-2009, 03:33 PM
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#38
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Super Moderator
Join Date: Dec 2007
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Btw Ben, I don't know why nooo one has mentioned this, but you can significantly drop your compression without changing your cry baby quench, by changing only the head gasket.
Should I elaborate, or should I be a dick and let you guys figure it out?
And yeah, you can use more lift. Those are some big ass ports. Don't worry about duration changing. Duration as measured wll change with different rockers but actual duration doesn't change. Review the duration article I stickied if you don't know what I mean.
I wouldn't say your AFR is out of whack, but you could def make some more power and resist pinging with a 12.5 at WOT.
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I <3 forced induction.
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10-08-2009, 03:52 PM
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#39
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by enkeivette
Btw Ben, I don't know why nooo one has mentioned this, but you can significantly drop your compression without changing your cry baby quench, by changing only the head gasket.
Should I elaborate, or should I be a dick and let you guys figure it out?
And yeah, you can use more lift. Those are some big ass ports. Don't worry about duration changing. Duration as measured wll change with different rockers but actual duration doesn't change. Review the duration article I stickied if you don't know what I mean.
I wouldn't say your AFR is out of whack, but you could def make some more power and resist pinging with a 12.5 at WOT.
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If going to a thicker gasket to drop CR, the only way to maintain quench (assuming I even have vaguely correct quench as it is), would be to change pistons right? If not, you need to elaborate.
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10-08-2009, 03:57 PM
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#40
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Super Moderator
Join Date: Dec 2007
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Quote:
Originally Posted by Vettezuki
If going to a thicker gasket to drop CR, the only way to maintain quench (assuming I even have vaguely correct quench as it is), would be to change pistons right? If not, you need to elaborate.
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You change the bore of the HG.
I went from a .041 to a .061, but that only got me half way to 9:1, the rest was the 4.166 bore over the old 4.03 bore.
But really, you need to know your measurements. What could happen here for example is that you'll find that you have a .03 HG and quench right now, and that you can go up to a .05 HG/ quench with a bigger HG bore and that'll bring you way down while keeping your crybaby quench. Which for the record, I think there is too much hype about.
The HG bore change alone will prob not drop your CR enough, so you really need some specs to see if you could increase the thickness. Even a few 10/1000 in combination with a bigger bore will make enough of a difference. I think when Brutal did the math to determine my new CR but left out the bigger bore, it made a difference of about .2 points.
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