Equal Length Header Question
#1
Equal Length Header Question
I am considering buying a set of Tomei headers for my car (MY06 Spec C), but I have a quick question regarding the size of the primaries.
On the factory headers the primaries are 42.7mm, whereas on the Tomei headers they are 38mm, yet Tomei still claim they develop more power.
How is this and can anyone explain further?
On the factory headers the primaries are 42.7mm, whereas on the Tomei headers they are 38mm, yet Tomei still claim they develop more power.
How is this and can anyone explain further?
Last edited by MrRA; 06 March 2007 at 11:13 PM. Reason: spelling!
#3
Spec C is a JDM only model mate and as such still runs the EJ20 engine, which uses equal length headers.
My question is relating to the design of the Tomei headers and the fact that the primaries are of a reduced diameter to OE headers and was wondering as to how this can be of an advantage as Tomei claim an approximate 15BHP increase when used with their own specific ECU, but I'm sure a remap would do just as fine as using their ECU anwyay.
When used with STD EDU
http://www.tomei-p.co.jp/inf/pdf/48.pdf
My question is relating to the design of the Tomei headers and the fact that the primaries are of a reduced diameter to OE headers and was wondering as to how this can be of an advantage as Tomei claim an approximate 15BHP increase when used with their own specific ECU, but I'm sure a remap would do just as fine as using their ECU anwyay.
When used with STD EDU
http://www.tomei-p.co.jp/inf/pdf/48.pdf
Last edited by MrRA; 06 March 2007 at 11:18 PM.
#5
Scooby Regular
iTrader: (8)
is it worth changing your headers as im sure all the jdm models come with stainless steel equal length manifolds as standard ??? i will know for definate on sunday when i pick mine up as i have changed mine for un equal length ones so i should have a scooby burble for a change
#6
is it worth changing your headers as im sure all the jdm models come with stainless steel equal length manifolds as standard ??? i will know for definate on sunday when i pick mine up as i have changed mine for un equal length ones so i should have a scooby burble for a change
What I am asking is how can the Tomei headers claim to provide more power if the primaries are of a smaller diameter than the OE ones and how will this affect spool up?
I am considering buying them but would like to know if someone with a bit more knowledge and experience than me can elaborate on my question.
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