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Brum
P Plater
65 Posts
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 Posted - 08 Aug 2006 : 8:11:03 PM
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Hey guys, quick question about roller rockers, has anyone got them and tried them, to see if they actually make a difference in the V6? I have heard different stories... And the holden V6 come stock with 1:5 ratio rockers... Cheers
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mouce
National Driver
1525 Posts
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Posted - 08 Aug 2006 : 10:23:23 PM
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On a completely stock motor I believe that they make little difference, especially if you're going to keep the stock ratio. If you were to step up to a 1.6:1 or even 1.9:1 then you might see a difference, but to get the most out of them you'd really need to be looking at a good set of extractors, and a full length high-flow pipe system. Add a pod filter and a CAI and you'll start to notice the gains that they can give you.
They are a cheap alternative to a cam upgrade though. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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lolo
Fully Licenced
503 Posts
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Posted - 08 Aug 2006 : 10:42:41 PM
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| with extractors and exhaust, the FIT 1.9:1 item gives a proven 10 - 15kw |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
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mouce
National Driver
1525 Posts
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Posted - 09 Aug 2006 : 4:16:54 PM
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| The extractors and exhaust on their own would be giving about 10rwkw ;) |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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lolo
Fully Licenced
503 Posts
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Posted - 10 Aug 2006 : 8:43:04 PM
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| 10 -15 rwkw on top of what the car was doing with extractors and exhaust... that what the magazines and FIT's website claim... before and after dyno sheets, the works |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
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trizo
Forum Moderator
3091 Posts
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Posted - 10 Aug 2006 : 9:07:58 PM
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wat size exuahst is this that ur talkin about?hmmm interesting please enlighten me!
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3 can keep a secret if 2 are dead |
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mouce
National Driver
1525 Posts
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Posted - 11 Aug 2006 : 10:20:42 AM
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Most places will recommend a 2.5" set of pipes. Unless you've got a motor worked off its nut the 2.5" full lengths with a hi-flow cat installed would be fine. Plus, they usually leave you with a really nice exhaust note.
@lolo: I can believe that they'd give a fair bit like that, I was just being difficult :) |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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trizo
Forum Moderator
3091 Posts
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Posted - 12 Aug 2006 : 01:58:24 AM
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| @mouce that's nuthin new we all know ur a hard nut lol..and yeah 2.5 don't the stok come out with 2 inch?And y can't u go any go any bigger (not that I wat 2)if ur motor is not off it's nut as u say?will this suk 2 much out of it or wats the story? |
3 can keep a secret if 2 are dead |
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lolo
Fully Licenced
503 Posts
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Posted - 13 Aug 2006 : 12:32:13 AM
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| well guys I will be getting 1.82:1custom roller rockers and a custom made exhaust so :) so yeah no extractors etc @mouce I knew you didnt want to start another "Power Steering Leak" type thread lol |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
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mouce
National Driver
1525 Posts
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Posted - 13 Aug 2006 : 12:14:38 PM
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You can go to whatever size you want, there's no one saying that 2.5" is the max. But unless you want to do a bit of work on the engine then going above 2.5" will drop the back pressure too much, and you'd need to at least do a retune of the memcal to get it to run properly.
I know guys who have put in 3" systems with no other mods and actually lost power, they went back to a 2.5" system and found that it was much better. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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