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fordfreak ef
Cruise Moderator
Age:25
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 Posted: Fri May 16, 2008 11:43 am Post subject: |
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| ^^ very interesting!.. i will check it out! |
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edfairmont4.0
Fordmods - Getting Side Ways
Age:22
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Location: newcastle NSW, Australia
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| Posted: Fri May 16, 2008 12:30 pm Post subject: |
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| Get a 3" exhaust. I dont care what ppl say its proven superior on "WORKED" 4L's |
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fordfreak ef
Cruise Moderator
Age:25
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| Posted: Fri May 16, 2008 12:32 pm Post subject: |
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| edfairmont4.0 wrote: | | Get a 3" exhaust. I dont care what ppl say its proven superior on "WORKED" 4L's |
someones "opened up a can of worms" in one hand and "opened up pandoras box" in the other.. |
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nicco
Fordmods - Getting Side Ways
Age:21
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| Posted: Fri May 16, 2008 1:04 pm Post subject: |
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| with that butterfly mod that was done ^^^, did you dyno/take it to the strip before and after? or going by the seat-of-the-pants-o-meter? |
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tetgreg888
Fordmods Newbie
Posts: 16
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Location: Aldinga Beach S.A. SA, Australia
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| Posted: Fri May 16, 2008 5:34 pm Post subject: |
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| edfairmont4.0 wrote: | | Get a 3" exhaust. I dont care what ppl say its proven superior on "WORKED" 4L's |
Full 3inch system from the CAT back . I know a place that does a 3inch system then once its over the Diff change it to 2.5inch apparently it stops any droning. |
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edfairmont4.0
Fordmods - Getting Side Ways
Age:22
Posts: 406
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Location: newcastle NSW, Australia
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| Posted: Sat May 17, 2008 11:07 am Post subject: |
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| im running a 3" from the extractors all the way till the end, doesnt droan... but it did with a stock standard motor. |
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skidder
Fordmods - Getting Side Ways
Age:19
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Location: Brisbane QLD, Australia
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| Posted: Sun May 18, 2008 11:04 am Post subject: |
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| tetgreg888 wrote: | | edfairmont4.0 wrote: | | Get a 3" exhaust. I dont care what ppl say its proven superior on "WORKED" 4L's |
Full 3inch system from the CAT back . I know a place that does a 3inch system then once its over the Diff change it to 2.5inch apparently it stops any droning. |
you would be better off running either a 2.5in system the whole way or a 3in the whole way with resonator if you find it drones.
the whole reason most people run 2.5in over 3in is because the exhaust gas velocity is kept higher, meaning the exhaust is hotter going through mufflers/resi's (hotter gas is lighter, easier for the engine to push....its true that it also occupies more volume when hotter, but the mass difference between hot and cold gas outweighs this difference).
I haven't figured out optimal flow rates between 2.5 and 3in for an i6 engine, but its a safe bet to say you will gain up top with a 3in but lose a little down low. In saying this, quality of mufflers will most likely have more of an impact lol.....
ohh..but with going from a 3in back to a 2.5in 2/3 of the way along...i think you would be better going with a 2.5in the whole way and a 3in muffler if you were so concerned about the flow (otherwise when you go back to 2.5in you are forcing slower (and cooler/heavier) gasses to accelerate requiring more energy) |
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tetgreg888
Fordmods Newbie
Posts: 16
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| Posted: Sun May 18, 2008 12:07 pm Post subject: |
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| skidder wrote: | | tetgreg888 wrote: | | edfairmont4.0 wrote: | | Get a 3" exhaust. I dont care what ppl say its proven superior on "WORKED" 4L's |
Full 3inch system from the CAT back . I know a place that does a 3inch system then once its over the Diff change it to 2.5inch apparently it stops any droning. |
you would be better off running either a 2.5in system the whole way or a 3in the whole way with resonator if you find it drones.
the whole reason most people run 2.5in over 3in is because the exhaust gas velocity is kept higher, meaning the exhaust is hotter going through mufflers/resi's (hotter gas is lighter, easier for the engine to push....its true that it also occupies more volume when hotter, but the mass difference between hot and cold gas outweighs this difference).
I haven't figured out optimal flow rates between 2.5 and 3in for an i6 engine, but its a safe bet to say you will gain up top with a 3in but lose a little down low. In saying this, quality of mufflers will most likely have more of an impact lol.....
ohh..but with going from a 3in back to a 2.5in 2/3 of the way along...i think you would be better going with a 2.5in the whole way and a 3in muffler if you were so concerned about the flow (otherwise when you go back to 2.5in you are forcing slower (and cooler/heavier) gasses to accelerate requiring more energy) |
Thanks for that I might do the 3inch system and try it out. Hopefully changing diff to 3.7 should help any bottom end problems. Get the power to the ground a bit quicker than the stock diff I have now, Also might look more into Stall Converters but I have heard can cause problems sometimes with the ECU |
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dazzler351
Fordmods Newbie
Age:38
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Location: gold coast QLD, Australia
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| Posted: Sun May 18, 2008 6:28 pm Post subject: |
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Put a GT system on yours mate , with no other changes but my airbox i went from 14.6 with 2 1/2 " to 14 flat with the 3.15"total surface area twin system.
You know where to find my videos so make up your own mind , if i run quicker next month with NO zorst i will be very surprised HAPPY but surprised ...cheers .  |
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fordfreak ef
Cruise Moderator
Age:25
Posts: 8228
Joined: 17 Apr 2005
Location: ya mums bed! lol NSW, Australia
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| Posted: Sun May 18, 2008 6:46 pm Post subject: |
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| perhaps to get this thread back on topic to intakes.. another thread can be created.. as in.. pros-cons of 2.5 inch vs 3 inch exhaust?? as there seems plenty of people here willing to debate it.. |
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skidder
Fordmods - Getting Side Ways
Age:19
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Location: Brisbane QLD, Australia
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| Posted: Sun May 18, 2008 7:03 pm Post subject: |
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| fordfreak ef wrote: | | perhaps to get this thread back on topic to intakes.. another thread can be created.. as in.. pros-cons of 2.5 inch vs 3 inch exhaust?? as there seems plenty of people here willing to debate it.. |
those threads always make me laugh lol, turn into the biggest s**t
its all to application and i was only replying to the thread starters application (ie DOHC 4.0L trying to get over 200rwkw, rev range for power). As soon as you make a thread about 2.5in to 3in exhausts everyone has their own opinion as to how the 2kw they picked up made their car feel like a track hero |
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tetgreg888
Fordmods Newbie
Posts: 16
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Location: Aldinga Beach S.A. SA, Australia
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| Posted: Sun May 18, 2008 8:11 pm Post subject: |
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| fordfreak ef wrote: | | perhaps to get this thread back on topic to intakes.. another thread can be created.. as in.. pros-cons of 2.5 inch vs 3 inch exhaust?? as there seems plenty of people here willing to debate it.. |
Fair call like you said before "a can of worms" |
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