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post #1 of 13 (permalink) Old 08-03-04, 02:46 AM Thread Starter
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exhausts: xf v el

prior to owning my el I owned an xf (4.1) with 2.25 inch zorst and extractors and it went very hard for a 350,000km engine eg sideways on take off and spinning into second gear. My question is, why is a slightly smaller engine 4l (el) need a bigger zorst (2.5in) for optimum performance?

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post #2 of 13 (permalink) Old 08-03-04, 06:49 AM
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Re: exhausts: xf v el

Probably because its a more efficient engine and as such will pump more exhaust, despite being about 80cc smaller
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post #3 of 13 (permalink) Old 08-03-04, 08:25 AM Thread Starter
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Re: exhausts: xf v el

Thats a good point

Does anyone on here have 2.25inch zorst on there ea-au 6's, if so how does it perform.
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post #4 of 13 (permalink) Old 08-03-04, 05:18 PM
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Re: exhausts: xf v el

Quote:
Originally Posted by xfspacsix
Thats a good point

Does anyone on here have 2.25inch zorst on there ea-au 6's, if so how does it perform.
I went from the standard 2.25" to a 2 1/2" exhaust on my old EA, apart from the note difference, i felt like it was breathing much better, felt much better to drive to. Keep in mind the new exhaust is mandrel bent, and probably sounding tough just made it feel better :)

Cheers.

Nath

Proud owner of a Ford Falcon 96' EFII XR6, 5 Speed, 2 1/2" exhaust, AUII XR8 air intake snorkel, BMC Panel Filter --> extractors are soon on the list of things to do.
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post #5 of 13 (permalink) Old 08-04-04, 05:54 AM
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Re: exhausts: xf v el

My car gained and extra 15rwkw with my zorst, before any other mods were done.

EB S-Pak,4L auto, ,Stage 2 Crow Cam & springs,Vernier gear,Port/polish,Pacemaker headers and 2 1/2 zorst,Chiptorque chip,slotted rotors,3.08 lsd.
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post #6 of 13 (permalink) Old 08-04-04, 06:03 AM
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Re: exhausts: xf v el

Quote:
Originally Posted by rau
My car gained and extra 15rwkw with my zorst, before any other mods were done.
proven or is this one of those shop claims? if so, which one you get? Brand, size, 1muffler+1resinator, built in shop or factory made?

ALex
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post #7 of 13 (permalink) Old 08-04-04, 06:07 AM
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Re: exhausts: xf v el

Pacemaker extractors, 3" hi-flow cat, 2.5 straight thru zorst and super cat muffler

EB S-Pak,4L auto, ,Stage 2 Crow Cam & springs,Vernier gear,Port/polish,Pacemaker headers and 2 1/2 zorst,Chiptorque chip,slotted rotors,3.08 lsd.
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post #8 of 13 (permalink) Old 08-04-04, 10:50 AM Thread Starter
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Re: exhausts: xf v el

put on redback zorst (2.5in) yesterday and genie extractors, heaps of people think there no good but I have found them to be alright, and everything for only 660 fitted.
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post #9 of 13 (permalink) Old 08-07-04, 07:08 AM
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Re: exhausts: xf v el

So what would give me more power from my 4.1 XF, a 2.25" or a 2.5"?
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post #10 of 13 (permalink) Old 08-07-04, 07:18 AM
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Re: exhausts: xf v el

Be best to go for a 2.25" so you don't loose power in the lower parts of the rev range...
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