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10-12-2005, 09:39 AM | #1 | ||
Smile
Join Date: Dec 2004
Location: Merrylands Sydney
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Well ive been thinking about it an think a 4 inch exhaust may be my next move.
If 5 litre enigines run with 2 2.5 inch units well the area of piping is 5 inches. So we are essentially running each 4 cylinders off 2.5 inch pipes. I might give this a go.1 inch per litre
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10-12-2005, 09:46 AM | #2 | ||
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HAve fun with that.....Id love to hear that :>:>.. Is there even room to run a pipe that size.
Just dont go pulling the house drain pipe of the gutters of youre house... Last edited by INJECTED_250; 10-12-2005 at 09:51 AM. |
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10-12-2005, 09:49 AM | #3 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
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Go for it Stav.. will be "interesting"
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Older, wiser, poorer. Now in Euro-Trash. VW Coupe V6 4motion.
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10-12-2005, 11:41 AM | #4 | |||
Silhouette AU1 TS50.
Join Date: Dec 2004
Location: Radiator Springs, Victoria.
Posts: 2,135
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Quote:
You meanie! But after reading some of your posts of late useless, I say go for it too.. build that rocket wagon! Why stop at 4"?
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10-12-2005, 09:51 AM | #5 | ||
Moderator
Join Date: Feb 2005
Location: Kenthurst
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I don't think it works quite like that though.
high-boost applications use 4" exhaust systems. For N/A systems to work properly they need the right size for the exhaust pulses to scavenge the gases out of the system. It works on vacuum to suck the exhaust out ... each pulse has a vacuum behind it to suck the next wave of gas out. Going too large in diameter will not allow enough vacuum ... which in turn doesn't allow to gass to get out quickly enough ... resulting in a loss power and torque. Turbocharged vehicles are different ... needed as large as possible an exhaust (high boost applications) ... as the turbine wheel causes turbulence ... totally different to an N/A setup. There's some excellent tutorials out there on the web about this that explains it better than I can. The V8s use 2.5" for each side ... which is a decent size ... but it allows for exhaust pulsing to work efficiently ... going up in size too much can adversely affect this. What are you currently running now on the 6??? With your power outputs .... you should be able to go up to 3" in diameter ... and gaining some ... but jumping up to 4" I think you will find you will lose power ... and definitely lose torque as well.
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10-12-2005, 09:53 AM | #6 | |||
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10-12-2005, 09:57 AM | #7 | ||
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Here is somthing i find interesting.. I actually went from 103-104 to constant 107's gained 3-4 mph by dropping the exhasut at the colector on my 250 cortina .. THe system is 2.5 inch with only one semi/of set muffler. There for by fitting a 4 inch system wouldnt this just be kinda the same. There for no loss should be experianced. IT would depend on the CAM i was running a pretty hot 260@050 cam which i gues would like a very free flowing exhaust... ON an AU with a mildish cam (which they are in the world of cam shafts) i could see a power loss occuring but hey u never know. Mabie run it on a dyno with the exhaust of then on???
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10-12-2005, 01:48 PM | #8 | |||
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Quote:
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10-12-2005, 02:05 PM | #9 | ||
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Firstly cars without exhausts do pick up power but its at the expense of the low end. Secondly twin 2.5" isn't the same as a 5" exhaust, its far less than that, some simple maths will show you that. Thirdly, V8's with twin 2.5" or even single 3" systems do suffer from low end power loss compared with smaller pipes.
A 4" system on a NA 6cyl running 15's is an absolute joke, but I guess it will give all those genIII's you keep beating something to look at as you pull away from them. |
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10-12-2005, 02:06 PM | #10 | ||
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What do gen3s have to do with anything.
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10-12-2005, 02:10 PM | #11 | ||
Diabolus
Join Date: Oct 2005
Location: Brisbane
Posts: 155
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i say get a single 2 1/2 or 3'' and put a 4" tip on the end, or why not a 5" :P
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10-12-2005, 02:11 PM | #12 | |||
TL40 Wagon?
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11-12-2005, 01:05 PM | #13 | ||||
AU DIE HARD
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somthing 2 be heard (usually up 2 5 miles away yes I am old) complete with triple carbys + one muther of a cam shaft...... 6 defects in 6 months could"nt all be wrong could they...... xw long since gone to Ford heaven but motor still lurking in corner of shed just waiting.............. So I reckon if you car"nt fit it under chuck it down the side + Go 4 it lol Whoosha.
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11-12-2005, 01:09 PM | #14 | |||
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11-12-2005, 01:19 PM | #15 | ||||
AU DIE HARD
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its no good Ive got go to the shed and start plotting a new life for it she who rules not gunna be happy...............................lol
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........Age and treachery will ALWAYS overcome youth and skill....... CORTINA 250 2V POWER soon to be AUXR8 Windsor pwrd .............WINDSOR WARLORD WHO CARRIES THE CLEVO MAFIA AND BROKEN BOSSES... .................................................. Quote:
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10-12-2005, 11:10 AM | #16 | ||
Ute Forum Moderator
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Sorry Casper but now that reality has intruded... It is not the diameter, it is the area of the exhaust that matters - 2 x 2.5" pipes do not have the same area as a 5", quite a lot less in fact.
I have a flaw in the theory though, I have a <1L car with a 2" exhaust... perhaps you should go 2" per litre and have an 8" exhaust lol |
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10-12-2005, 11:12 AM | #17 | |||
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10-12-2005, 11:16 AM | #18 | |||
Boss power
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10-12-2005, 12:49 PM | #19 | |||
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10-12-2005, 12:25 PM | #20 | ||
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LOL 4in is too big... i wont say anymore..
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10-12-2005, 01:11 PM | #21 | ||
TL40 Wagon?
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A good twin 2.5' system could be worth while but I doubt it. A 4" single system just won't fit and really has no hope as it will be too hard to run properly on a street car.
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10-12-2005, 01:37 PM | #22 | ||
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Location: Merrylands Sydney
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Ok then why do cars with no exhaust gain big power?
For all the smart guys.
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10-12-2005, 01:41 PM | #23 | |||
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Not all cars do. My bike is slow as walking with a dropped exhaust.
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10-12-2005, 01:43 PM | #24 | ||
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If the air fuel ratios are corrected it should run good
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Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again |
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10-12-2005, 12:34 PM | #25 | ||
T3/Sprint8
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Stav I love your mental battles to get more power !
Ever thought up there about buying a faster car ?
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10-12-2005, 01:44 PM | #26 | |||
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Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again |
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10-12-2005, 12:38 PM | #27 | ||
Miami Pilot
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Does he mean 4" long, or 4" diameter. 4" long may work, but not diameter.
To get the same area as dual 2.5" on a 5L for your 4L, 3.1" is the optimum size, so 3" is the size you could go.
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10-12-2005, 12:41 PM | #28 | ||
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ive got 3inch on my car, and i think thats boarderline, feels a little gutless under 2500rpm, but having a manual im not overly fussed...
but for an auto, i think it would make it slower off the line.. |
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10-12-2005, 12:49 PM | #29 | ||
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OMG. I can't wait to see the result on the track...... Stav were does your knowledge come from. Have you been talking to 18 year old kids with there mother's auto Hyundai's and big exhaust.
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10-12-2005, 01:55 PM | #30 | |||
FF.Com.Au Hardcore
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Id LOVE to see the look on the faces at the exhaust shop when you ask them to fit the 4" pipe. |
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