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 Post subject: Exhaust sizing
PostPosted: Wed Apr 16, 2008 11:46 am 
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Joined: Wed Apr 09, 2008 11:34 am
Posts: 10
My swift is 1991 gti, with no lambda sensor and catalysator.I have lighten flywheel and underdrive pulley, polished head and everything inside engine is in perfect state....I have also Vela's chip switch....

I have many more things but my english is bad so I can't remember how to pronounce it.I should have about 115HP.
I will put on an K&N CAI kit (CAI by myself).

So, the question is, which sizing to put on? i readed somewhere that 2 inches (outer or inner diameter???) is very good, and 2.25" and 2.5" also..But is this inner or outern diameter?? I readed it here http://www.redlinegti.com/forum/vth.109 ... t+size.htm


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 Post subject: Re: Exhaust sizing
PostPosted: Sun Apr 20, 2008 8:59 am 
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Joined: Sun Jan 26, 2003 5:46 pm
Posts: 783
Location: toronto, ontario
do not go over 2". 2" outer diameter is a perfect size. you can even go 1 7/8" outer diameter...

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14.84 @ 93.89 with No ITB's, No standalone computer, No dog box, Stock MAF, Single TB and Street tires all in a complete mk2. not bad eh!


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 Post subject: Re: Exhaust sizing
PostPosted: Sun Apr 20, 2008 3:15 pm 
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Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
hell if you plan on modding it a bit more go for 2.25, but that would be as big as id go before I start making more power. its an n/a motor so id only suggest 2 or 2.25. 2.25" is an "upgrade" on cars that make 140hp stock

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1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


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 Post subject: Re: Exhaust sizing
PostPosted: Sun Apr 20, 2008 4:10 pm 
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Joined: Sat Jun 03, 2006 11:54 pm
Posts: 673
Location: Illinois
It's all about where you want it to run. 7-9k with compression, cams, headers, and a short runner intake, then 2.25" is good. Stay on the small side. Scavenging is your friend.

David Vizard, Popular Hot Rodding, other mags as well, suggests that 2.2 cfm per horsepower in pipe size is optimal. Google "exhaust, the misunderstood science of hot air, david vizard" for specifics, details, and mathematical formulas.

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If it ain't broke, fix it until it is. LOL.


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 Post subject: Re: Exhaust sizing
PostPosted: Sun Apr 20, 2008 4:55 pm 
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Joined: Wed Apr 09, 2008 11:34 am
Posts: 10
It is big difference bitween 2.25" outer diameter and 2"....

I would like to put 50mm inner diameter...I thing 2.25" outer is way too much....


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 Post subject: Re: Exhaust sizing
PostPosted: Sun Apr 20, 2008 7:04 pm 
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Joined: Sun Jan 26, 2003 5:46 pm
Posts: 783
Location: toronto, ontario
the swift stock exhaust system is 1.5". a 2" exhaust system will put you at a 1/2" bigger than stock which is plenty. if your going with an N/A setup with big cams then a 2" system will be perfect. if your going with a mild N/A setup then go with a 1 3/4" setup or 1 7/8". 2.25 is way to big you will lose too much bottom end...

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14.84 @ 93.89 with No ITB's, No standalone computer, No dog box, Stock MAF, Single TB and Street tires all in a complete mk2. not bad eh!


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 Post subject: Re: Exhaust sizing
PostPosted: Mon Apr 21, 2008 8:55 am 
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Joined: Wed Apr 09, 2008 11:34 am
Posts: 10
I ordered 50mm inner diameter so we will see how it will be....I hope it will be good


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