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BFII XR8 Sedan mods 

 

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 Post subject: BFII XR8 Sedan mods
Posted: Sat Dec 20, 2008 12:54 am 
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Hey guys, just got my first 8 and have done a dual 2 1/2 cat back exhaust & an ss inductions growler cold air. I'm about to have it flashed and tuned, just wondering if there is anything else (low key) i could do that could help me on my way to my target 250rwkw?
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Posted: Sat Dec 20, 2008 4:29 am 
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Id recommend getting a set of extractors and high flow cats on before you flash tune it.

Extractors made a good power gain on my AU.

Dave

 

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Posted: Sat Dec 20, 2008 6:20 am 
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Yes get your extractors done first, then get the car flash tuned to suit with a custom tune for your car taking into account your mods, not an off the shelf tune. New oil pump gears are a wise investment too on the Boss motors.

 

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Posted: Sat Dec 20, 2008 8:17 am 
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As above with the mods.

230rwkw would be a good tune on it without going overboard.
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Posted: Sat Dec 20, 2008 2:30 pm 
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First thing i would do is ditch the Growler, get some billet oil gears first, extractors, BPR airbox, under drives then a tune.

 

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Posted: Sat Dec 27, 2008 12:04 am 
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Thanks guys for the advice.
I looked a little further into it - Pacemakers & magnaflow cats seem to be the go.
Any suggestions??
are headers really such a big job as most are saying?!
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Posted: Sat Dec 27, 2008 7:14 pm 
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yeah depending on the headers you need to lift the engine up to fit them, there isnt alot of clearance between the guards and the heads
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Posted: Sat Dec 27, 2008 9:35 pm 
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Get underdrives before you do anything else.
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Posted: Sun Dec 28, 2008 12:16 am 
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Pacemakers 4-1s are a easy to fit and good stuff as well. I fitted mine while the car was on the driveway. Easier to fit than pacies on a Holden 5.0L.

 

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Posted: Sun Dec 28, 2008 12:59 am 
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VILLN wrote:
Thanks guys for the advice.
I looked a little further into it - Pacemakers & magnaflow cats seem to be the go.
Any suggestions??
are headers really such a big job as most are saying?!


Get DiFillipo headers and cats , they are THE best when it comes to the BOSS.

And yes doing headers is a big PITA, takes at least 4 hours if you know what you're doing and have a hoist.

230RWKW from a BF XR8 should be easy, so will 250 with the above.


(also as already suggested, the BPR aka BluePower airbox is the way to go).

 

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Posted: Sun Dec 28, 2008 1:02 am 
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Another real good mod if you want to go faster, is get a shorter diff ratio.

You didn't mention if it was a manual or auto. But...

Manual, go for 4.11:1 ratio
Auto, go for 3.46:1 ratio.

What is does is help the BOSS get into and stay in the peak revs more. Some of the best money to be spent right there.

 

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Posted: Tue Dec 30, 2008 11:44 am 
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is the 3v any different with regards to requiring the billet oil pump gears like the BOSS?

would you be able to achieve 230+ at the treads with the defilli's, 2x2.5 pipe, bpr box, underdrives and tune?

is the 3v that much different to the boss other than the head/cam?

 

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Posted: Tue Dec 30, 2008 12:36 pm 
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Bottom end is exactly the same (FPV BOSSes get better parts used and balancing)

If you're going for underdrives and more revs, then definately get the oil pump done too (when getting the underdrives saves on labour that way).

 

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Posted: Tue Dec 30, 2008 1:39 pm 
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You'll easily achieve over 230kw with those mods.
The 3V has a higher volume oil pump already because it needs extra oil to drive the VCT.
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Posted: Sat Jan 10, 2009 11:37 pm 
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thanks for all the help guys.
So far - full system - headders, hi-flo cats & 2 1/2.
SS inductions Growler cold air & vortex T/B ad. I am about to get a custom tune but thought i would ask the question about underdrive pullys.

Has anyone had a set fitted to a six speed auto? Will it make much of a difference?
Thanks
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