Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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which is better?
4-2-1
or
4-1
for a 1.6 16v that will be used on the odd track day.
and does it matter weather it it is mild steel or stanless
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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stainless or mild wont matter for performance, its the design that counts. i have always had 4-2-1 manifolds. how much do you want to spend, money could be spent in other areas
a vsport or btb 4-2-1 manifold will be the best bet
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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i will be using a std cat, and have used janspeed in the past, but they dont do one that doesn.t have the sai hole in
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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get rid of the cat and the sai. why do you want to keep them?
IMO pointless doing much, if any exhaust mods if your keeping the std cat
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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i have a c16xe so no sai thats why i want a manifold without it.
i need a cat for mot reasons and to keep the car legal
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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janspeed one is a good cheap option that seems to give good results, not massive gains to be had from them tho, id spend the money on a new inlet and a remap. just swap the cat over for mot
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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thats good, but the janspeed one has sai hole and groove cut into it, ive phoned them and they wont do one without the grooves and hole. which will cause uneven exhaust pressure between the cylinders wont it?
even if i block up the hole
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Superlite Ltd.
Member
Registered: 9th Jan 07
User status: Offline
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quote:
Originally posted by Adam-D
i have a c16xe so no sai thats why i want a manifold without it.
i need a cat for mot reasons and to keep the car legal
I had a c16xe with a sportex 4-1 manifold and i was dissapointed with the loss of low rpm torque. I had to rev the thing to 4k before it started to pick up 
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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so 4-2-1 is the way to go,
ive got a randon thought about getting the janspeed one, welding up the grooves and skimming the face of the manifold and doing that
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rossgamble
Member
Registered: 31st Jan 08
Location: Donemana, N.Ireland
User status: Offline
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4-2-1 is searched and searched for one for my suszuki g13b engine could find one so had to compermise for a 4-1, Supposedly the 4-2-1 helps with Torque and low down revs!!
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rossgamble
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Registered: 31st Jan 08
Location: Donemana, N.Ireland
User status: Offline
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Didnt see your post superlite two great minds think allike lmao
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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I have tested plenty of 4-1 and 4-2-1 manifolds on this engine, made a lot of them as well. unless you are going for a major engine spec I find that theres not much difference between the 2 designs in reality.
did back to back tests on them on the dyno and posted the results on here, do a search.
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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http://www.corsasport.co.uk/board/viewthread.php?tid=388563
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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the other thing that worries me about the 4-1 manifold, the lambda probe only reads one tube, where as i think there supposed to get a reading of all four so its more accurate and can adjust the fueling accordingly.
reading from one tube cant be as good as all 4
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chrex
Member
Registered: 26th Aug 07
Location: Brawdy/Wirral
User status: Offline
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I had a c16xe with a sportex 4-1 manifold and i was dissapointed with the loss of low rpm torque. I had to rev the thing to 4k before it started to pick up
Well you know the problems of a 4-1 Ad from my car...i cant get any power low down. I have to get to 3 before iv got any torque or pull from the engine at all.
you're gonna have to find a 4-2-1 really.
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Li-SRi
Member
Registered: 25th Oct 05
Location: Wirral
User status: Offline
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is that on your 1400 chris?
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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quote:
Originally posted by Adam-D
the other thing that worries me about the 4-1 manifold, the lambda probe only reads one tube, where as i think there supposed to get a reading of all four so its more accurate and can adjust the fueling accordingly.
reading from one tube cant be as good as all 4
just ask the company that you get the manifold from to put the lambda boss after the collector. 
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RCS
Member
Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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The type of cams you're running will determine how well the manifold performs.
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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std or fast road in the future, nothing major
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