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Old 02-23-2004, 00:21   #1 (permalink)
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Pacemaker PH4480-- Just Cant Decide

OK Guys

I know that the exhaust subject has been done to death, but for an auto equipped 4 lt tickford mill has anybody noticed the diffrence between the tuned length and normal paceys.

I hear that the tuned length are better for high rpm and normal for low end power

I am also sceptic to the 4480's because to me they dont look tuned length because there is some 10 cm diffrence between port 2 -3 if i remember correctly.

All i need is some dyno sheets or opinions from those who run an auto and have had both sets

I can source either set brand new for bugger all and just cant decide which to get
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Old 02-23-2004, 01:40   #2 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

What mods have u done to your car and what are your plans?

For street performance go the 4480's

These dyno results put up on the web here http://www.profixauto.com.au/xr6_ute.htm

look pretty good to me
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Old 02-23-2004, 05:32   #3 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

Yep, I'm in the same boat. I couldn't decide whether to go the 4480s or the 4499s. I even rang 2 different exhaust shops and guess what? They each chose a different one, but for the same reasons. Both said the one they chose gives better low down torque - go figure!

After looking around for a while, I will get the 4480s in the next few weeks or so, as they are the ones that give the low down torque benefit (supposedly). Price I got was $440 fitted.

redGhia - how cheap can you get them, and are you willing to get them at "your" price for FF members. I'm happy to pay freight to get them to ACT.
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Old 02-25-2004, 00:26   #4 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

The car is reasonably standard with only the tickford snorkel, and cat back exhaust etc., Down the track i would like to add a vortech blower but not for quite a while

I havent priced them up yet but when i do ill let you all know
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Old 02-25-2004, 01:42   #5 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

Hmmm thats tricky. I can say for certain that the 4480's are better for a road car with stock ecu. With an aftermarket ecu and a cam or a blower you may be better off with 4499's. Bigger is better with a blower! But untill you get the blower? well its not worth it.
My AU went from 106rwkw peak to 116rwkw with 4480's and a 2.5" exhaust.
The nice part was low end was improved too with 2nd gear rwkw at 60kmh going from 59 to 68kw.
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Old 02-25-2004, 05:11   #6 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

ok call me stupid but which number is for which set of extractors? im very bad at rembering numbers, and i have never seen a set with the number beside them anyway :S

are the 4480s the "new" "competition" pacemakers that look like a mangled bowl of spaghetti, and the 4499s are the same design that has been around for a while? 6>2>1 as opposed to the "competition" which are 6>3>1?

UNR8D just got a set of the competition ones for his fairlane, and it seems to have made a difference (though i havent actually been in the car, just driven beside him) i have the 'old' style JMM ones, and im not keen on forking out about $800 for a set of their new ones, but im not sure the normal JMM ones will be the best for my intended application (6000rpm with full aftermarket engine management and pretty damn big cam) i want ones that tear-ass in the top end - so what should i get?
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Old 02-25-2004, 05:31   #7 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

Help! If Rollin is asking questions, we are all in trouble.

The only answers i can give are that the 4499s are the 6->2->1 and the 4480s are the others.
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Old 02-26-2004, 00:46   #8 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

thanks for everyones replys ,whats the deal with cats. I know what i would pick, but can other put their thoughts forward as well

The factory cat is 2.5 in inlet and 2.25 in outlet. i have a berklee bolt 2.5 in cat back system which gives the car a bit of a note -- When i do extractors should i put on a normal 2.5 in 2.5 out cat or a "High Flow 2.5 in cat. with the "High flow cat being about $60 more i think it is wank factor

I am also thinking of unbolting the 10x4 s/through dogleg muffler at the front of the system and replacing it with a flanged in straght section of pipe with a 8x4 14 in.long 2.5in diameter O\Center F.G.P. straight through design so i can can change between aggresive and quieter system as needed with it only being a 5 minute job to swap over

So it seems that the 4480s (tuned length) will do the job quite well for what im after
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Old 02-26-2004, 02:26   #9 (permalink)
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Re: Pacemaker PH4480-- Just Cant Decide

a 'normal' cat should be sufficient.

if you can, have a look at them side by side - look into the holes at each end. the 'high flow' one should have bigger spaces between the honeycomb of the catalyst, or should have a wider 'cross-sectional' area if looked at from the front or back.

if you think there is $60 worth of difference and flow capacity between the sizes then go the big one...
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