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| Grechie |
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just wondering, if its possible to add a 3 inch cat back zorst without losing back pressure n power to a N/A i6...i know turbos usually have 3 inch turbo backs, but i herd a mate in a VS V6 commo tried a 3 inch cat back n it had no go, but maybe its different for the i6's perhaps? anyone tried it, i also know a friend who has a N/ skyline wagon, n it has a 3 inch cat back, but i dont know of its performance yet..
- Grechie
_________________ Ford Falcon EA Naturally Aspirated 4.0L i6 |
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| Mitch_ |
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Posts: 6168 Joined: 5th Nov 2004 |
why would u want 3inch? you would be better off spending the money elsewhere
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| data_mine |
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no need for bigger than a 2.5" on a I6 unless you've gone insane mods.
_________________ 1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
it not the back pressure that is the problem, it's the speed of the gas that is.
best advice don't do it. you loose to much air speed. back pressure is a resistance to flow and more flow is what you are trying to achieve. but you can't sacrifice air speed for for less back pressure. it's all a big balancing act. for a stock(ish) 4L 6cyl 2.5inch gives the best ballance between the two. |
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| bogan393 |
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Ive got a 3inch cat back on my ea atm awaiting a turbo. i didnt loose any power although im pretty sure i didnt gain any either, its has a nice sound but does tend to back fire under compression braking. For the extra $200 or so it really isnt worth it unless forced induction is planned.
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| fordfreak ef |
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anything larger than a 2.5 is over kill for a na i6...
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| data_mine |
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Both pacemaker and JMM extractors, terminate in a 2.5" flange - no point gettnig anything bigger.
_________________ 1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow |
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| Grechie |
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orite thanx guys
_________________ Ford Falcon EA Naturally Aspirated 4.0L i6 |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
bogan393 wrote: Ive got a 3inch cat back on my ea atm awaiting a turbo. i didnt loose any power although im pretty sure i didnt gain any either, its has a nice sound but does tend to back fire under compression braking. For the extra $200 or so it really isnt worth it unless forced induction is planned.
what do you mean extra $200 ??? there should be no difference in cost for a 3 inch over 2.5 |
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| USELESS |
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I think a 3 inch wil help.Less backpressure is always good.The reason why some cars run crap after is because of altered air fuel ratios.
_________________ 14.77 @92.71mph July 06 14.52@95.68mph July 07 14.241 96.7 MPH in a shoebox/taxi au ford wagon!!Bwahahah still cant believe it!!! |
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| Big Kev |
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Yeah for N/A the 2.5" would be fine....its only if your wanting the extra noise...although you will probably only get more droning.
To I know aaron (pyroay) had legality issues with his 3" setup - low cars with 3" setups the mufflers are very close to the ground.....
_________________ For Sale: 25 Farad Rockford Fosgate Competition Series Carbon Cap, more to come - pm me if interested |
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| Grechie |
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i was just wondering if getting a 3 inch cat back would hurt performance, im not after perofrmance gain from a 2.5, i was hoping that a 3 inch would have the same gain as a 2.5 but just havethat extra loud bang to it, but since it could possibly hurt perfomance being to big then ill forget bout it
_________________ Ford Falcon EA Naturally Aspirated 4.0L i6 |
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| XRCIST |
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JMM do a 3inch cat back in the BA dev2a kit. They claim it gives an extra 4rwkw over the 2.5''. That gain seems abit excessive on a six with just extractors and intake but the possibility of a gain is there.
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| data_mine |
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Keep in mind the 4 valve BA head flows alot better, so can make use of the bigger exhaust.
_________________ 1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow |
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