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Hi
Well I'll get started with... I have a 2.3 slant 4 engine in my car and it's been playing my mind for a while now about a dual exhAust... now it already has a single pipe to a Y piece, but i'm on about 2 separate pipes altogether? The factory down pipe is twin pipes into 1, but what would be the likelyNess of power loss If I was to do two pipes straight off the Down pipes straight out the back? The size of the tubes on the down pipes is 2", so would I want to stick at 2" or go to bigger like 2.5"?
Cheers
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I'm guessing you would loose back pressure as the pipes would be far to big for the engine size . It would be very sort of ' boomy' noise as well . So I'm thinking you would be down on power . Also your manifold is a 4-2-1 which is better for general use and torque. The different pipes help create a vacuum , drawing gas from the other cylinders away increasing efficiency . Its difficult to tell what will happen messing with that but it could give you flat spots .
I did make exhausts for all sorts of cars for quite a few years so thats my experience .
WRC cars used 3" tube and i think Touring cars had 3" as well so 2 2"or 2.5" is way to big .
Its up to you though . If you have either the money to spend or facilities to do it your self ,have a go , it might be ok .
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Apr 12, 2017 10:13:47 GMT
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how much power is it making? I doubt you need anything bigger than 2", 1"7/8 most likely.
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Apr 12, 2017 10:58:15 GMT
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the pipes must join as stated before if you don't join them it wont run well at all, 4-2-1 is good for road/fast road use but the standard cast manifold is very restricting on these, it all depends what other mods you have and if its pretty standard don't go bigger than 2inch I would even say 1 3/4 inch is plenty, I run a 2.5 inch system but am making about 190hp on the rollers with twin 48s, tubular exhaust manifold and loads of other mods
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Apr 12, 2017 11:39:32 GMT
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2.25" with 240 bhp here...
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Apr 12, 2017 12:18:01 GMT
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don't everyone laugh all at once... but it's a standard engine! i didn't know modification parts for these engines even existed anymore?? are these 4-2-1 made from a chalk board and a poke around or are they some sort of blydenstein attraction?
my original thought was to have the original manifold so it would be 4 into 2 and thats it, so 2 cylinders receive a tube each if you under stand what i mean? someone done this with a pinto and i tell you what.... i love the sound! it's got that v8 ish sound
link here
I wouldn't mind more power though! it's a VX490 2.3 in a viva gt, but when i took it for a spin, it fealt a bit similar in power to what my 2.0 pinto powered capri fealt like in performance. i know i have a 4 speed with over drive which i believe is the getrag?
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Apr 12, 2017 14:24:14 GMT
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they were only 110-116bhp @ 5000rpm in twin Stromberg form but they have good torque, the 2300 are a lazy engine so probably wont feel as revvy as the pinto but there is loads you can do to spice them up a bit, the 2000 that would have been in your GT was a much happier engine to rev as the bore to stroke ratio wasn't so over square as the 2300, try and find some good fuel they like that!
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Apr 12, 2017 14:34:17 GMT
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2" will be fine, I wouldn't separate the manifold into two branches, you'd be better off running a 1>2 silencer straight after the downpipe if you want twin pipes, the 4>2>1 of the manifold is to aid port scavenging and keep the engine free flowing.
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