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Author Exhaust Spec's
P1CK4D
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Registered: 19th Jun 06
Location: Around Essex Somewhere
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15th Mar 07 at 13:22   View User's Profile U2U Member Reply With Quote
Is there a certain bore size your supposed to have depending on what bhp your running etc? Im wanting a new exhaust and was wondering if it matters what size I get etc.. Thanks.
gianluigi
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Registered: 9th Mar 05
Location: Ipswich, Suffolk
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15th Mar 07 at 13:47   View User's Profile U2U Member Reply With Quote
might be BS but some guy who came to a meet one night mentioned something about for C20LET the best bore size is 3". so im guessing if its an 20xe or whatever, smaller than 3" should suffice.

P1CK4D
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15th Mar 07 at 13:49   View User's Profile U2U Member Reply With Quote
Oh right ok, but i was thinking, a C20LET could be running standard or could be running over 300bhp, that mean 3" bore is going to be the best for what ever power its making? Same for XE's..?
Robin
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Registered: 7th Jan 04
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15th Mar 07 at 13:57   View Garage View User's Profile U2U Member Reply With Quote
It does depend on power, yes.

As a rule of thumb, 2.25" is good for a standard XE, 3" is good for a 300bhp LET, so .25" per 50bhp
P1CK4D
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15th Mar 07 at 13:59   View User's Profile U2U Member Reply With Quote
Good thinking Robin, cheers for that. Does help alot actually, anyone else have any ideas?
P1CK4D
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15th Mar 07 at 14:01   View User's Profile U2U Member Reply With Quote
Actually are you sure? A 300bhp LET would need a 1.25" exhaust?
Scotty C
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Location: Kidderminster Drives: 1.6 16v Sport
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15th Mar 07 at 14:06   View User's Profile U2U Member Reply With Quote
I have 2.25" on my X16XE

But it's getting tuned so it's all good
Scotty C
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15th Mar 07 at 14:08   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by P1CK4D
Actually are you sure? A 300bhp LET would need a 1.25" exhaust?


He means, 2.25" on a standard XE, idealy 2.50" for a 200bhp XE or standard LET, a 2.75" for a 250bhp LET, or a 3" for a 300bhp LET, get it?
P1CK4D
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15th Mar 07 at 14:09   View User's Profile U2U Member Reply With Quote
Got it.. Thanks!
Robin
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15th Mar 07 at 14:09   View Garage View User's Profile U2U Member Reply With Quote
Yeah, I didn't word it very well did I?

What I mean is

150 = 2.25"
175 = 2.5"
200 = 2.75"
250 = 3"

Which doesn't work either

There's an article in PPC mag explaining better than me, I'll go and find it
P1CK4D
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15th Mar 07 at 14:10   View User's Profile U2U Member Reply With Quote
Ok, Cool, when you do, try and word it right.
Robin
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15th Mar 07 at 14:15   View Garage View User's Profile U2U Member Reply With Quote
Ok, PPC says

100bhp = 1.5"
200bhp = 2.75"
300bhp = 3.5"
400bhp = 4.25"

They seem a bit large to me though
Robin
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15th Mar 07 at 14:18   View Garage View User's Profile U2U Member Reply With Quote
It depends on the size of the exhaust ports too, the system should be 1.5-2 times the size of the primaries on the manifold, which should match the port sizes
P1CK4D
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15th Mar 07 at 14:26   View User's Profile U2U Member Reply With Quote
Thats fooking massive! lol. We'll see if any replies with what they are running bhp wise and exhaust bore size.
Scotty C
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15th Mar 07 at 14:41   View User's Profile U2U Member Reply With Quote
Broster & Dave are running near to 200bhp and i'm sure they're running 2.25"?
P1CK4D
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15th Mar 07 at 14:43   View User's Profile U2U Member Reply With Quote
Would the engine being either N/A or Turbo also affect this though?
Robin
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15th Mar 07 at 14:47   View Garage View User's Profile U2U Member Reply With Quote
Yeah, Turbo exhausts generally flow better as they have less silencers in them, so they don't need to be quite as big as an N/A engine of the same power, if that makes sense?

It's really really complicated
Vaux Lad
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Registered: 15th Dec 04
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15th Mar 07 at 14:49   View User's Profile U2U Member Reply With Quote
Turbo engines dont really on backpressure as much as NA, so yeah it does effect it.

Which is why turbo's are best with a larger bore system.
Dave A
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Registered: 10th Dec 03
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15th Mar 07 at 17:03   View User's Profile U2U Member Reply With Quote
theres no such thing as back pressure

 
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