Thread: 4-1 Headers talk!!

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2012-09-13 18:20:58

#41

Payu

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Originally Posted by nismo94tuner

Is the megaphone outlet 2.5" or the choke?

The outlet!!!

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2012-09-13 18:25:04

#42

nismo94tuner Online/offline status of nismo94tuner is unknown

-marsh tuned-

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Interesting. How about peak power? I would imagine it shifting upwards. Hopefully he tests it out at the track and see if makes a difference. I wish you guys could send us one of the header's you guys made so we could try some testing out!

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-Bes
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2012-09-13 18:25:59

#43

Payu

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Originally Posted by nismo94tuner

Tested!!! 12.2 @ 112.2

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2012-09-13 18:30:59

#44

nismo94tuner Online/offline status of nismo94tuner is unknown

-marsh tuned-

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Good shitttt. Hopefully we can see more cars diving into the 11's!

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-Bes
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2012-09-14 12:37:25

#45

happyharrysco1 Online/offline status of happyharrysco1 is unknown

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Originally Posted by SR20GTi-R

Grab some info on the early BTCC 54C's then let's have a discussion.

Grab the cam data, bore/stroke, header length and intake length.

They we're very long on that given motor for a reason.

jfip the late btcc prims (97 on, or to be precise the winning ones) used a tri-y, quoting graham dale-jones of ies "with an rpm limit of 8500 rpm you cant exploit a 4-1 to it's best"

Last edited by happyharrysco1 on 2012-09-14 at 12-38-05.

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2012-09-14 13:20:57

#46

Doctor G

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Originally Posted by happyharrysco1

Originally Posted by SR20GTi-R
Grab some info on the early BTCC 54C's then let's have a discussion.

Grab the cam data, bore/stroke, header length and intake length.

They we're very long on that given motor for a reason.

jfip the late btcc prims (97 on, or to be precise the winning ones) used a tri-y, quoting graham dale-jones of ies "with an rpm limit of 8500 rpm you cant exploit a 4-1 to it's best"

Did he give you the 4-2-1 specs?

I have some touring car tri-y specs - would like to compare.

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2012-09-14 15:19:02

#47

b12sr20ve

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I have a dethachable megaphone that i have made for the track. Just experimenting. 2.5 inlet transition to 3 around 15 inch long with reverse choke of 2.75 2inch lenght. The stock cam ve revv crazy spining my tires. Never dynod yet.wil test wid my n1 and nemu

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2012-09-14 18:16:17

#48

TheSam

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Last edited by TheSam on 2012-09-14 at 18-17-14.

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2012-09-14 20:24:05

#49

niZmo

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^ those are custom valve covers?

peace

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2012-09-14 21:07:08

#50

happyharrysco1 Online/offline status of happyharrysco1 is unknown

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no not custom, just that those are way early engines/covers, it was when ies came to the party (and nissan started winning in btcc) that 4-2-1 exhausts were used

the quote from graham jones of ies is from this article about the first of the ies btcc prim engines>> http://www.marklamond.co.uk/misc/scans/CCC_1999_Feb_Touring_Car_Engines.pdf

Last edited by happyharrysco1 on 2012-09-14 at 21-07-59.

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