South East Scoobies

South East Scoobies (http://www.southeastscoobies.co.uk/vbulletinforum/index.php)
-   General Car / Scooby Chat (http://www.southeastscoobies.co.uk/vbulletinforum/forumdisplay.php?f=17)
-   -   Rcm header set up (http://www.southeastscoobies.co.uk/vbulletinforum/showthread.php?t=20994)

scooby doo 10-01-2016 04:06 PM

Rcm header set up
 
On eBay seems good with all oem gaskets , I'd be tempted but can't as got to stay boring stock lol
Item number 252245120112

Scott.T 10-01-2016 05:53 PM

Boring stock work well if ported.
I'm sure a man of your engineering skill could arrange it.

scooby doo 10-01-2016 07:56 PM

The ra won't as then will need map and a lot of money for just ported headers,
Is there any proven gain from this aswell??
The rcm is a great fitment too , but will loose a little rumble from them

Scott.T 10-01-2016 08:09 PM

Quote:

Originally Posted by scooby doo (Post 218410)
The ra won't as then will need map and a lot of money for just ported headers,
Is there any proven gain from this aswell??
The rcm is a great fitment too , but will loose a little rumble from them

A certain funny blue STi ran with ported headers for quite some time before a remap.
I noticed a spool improvement when I did mine and again didn't bother adjusting the map.
It just makes it breath more easily and gets a great volume of air to the turbo quicker..

There are better gains to be had from ported OE then a lot of aftermarket so called performance headers.

scooby doo 10-01-2016 08:37 PM

That's interesting as always have this feeling that your only porting a inch down so your still with a restrictor, it's like having a 3 inch down pipe down to a 2.5 it still isn't free flowing just moving the limit further down ,
But if you say you felt an improvement then blows my theiry out,
Some aftermarket headers and up pipes don't work as to large and flood non large blowers,
I found the rcm worked very well on A vf35
I'm still unsure if I want to do that stuff to my ra as don't want to modify it other than fitting Sti parts
Would love these and the ti cat back that's for sale on here and get a ti down pipe to match

SpecB 11-01-2016 06:41 AM

Main issue with tubular headers is a loss of spool especially on the supplied up-pipe hence the turbo match Harvey Smith versions available from Alyn! Most people say stick with ported up to around 400/450 Bhp it's only above that you will see gains. I was running 440 on ported OE with matched up-pipe and gained 2 Bhp and lost about 100rpm spool when I switched, however the boost was 0.1 bar lower for the same result (And the clutch was slipping!).

http://www.southeastscoobies.co.uk/v...&postcount=184

asperformance 11-01-2016 08:39 AM

as above on a std car then a well ported set of headers and matched "trick" up-pipe will out spool and out perform most aftermarket set-ups.........

whilst the RCM / GT2 spec headers are very good for higher power they still suffer from a lack of response and can be improved again with a Harvey Smith "trick" up-pipe

scooby doo 11-01-2016 09:04 AM

Thanks for updates on this guy's, I've been reading up on the trick up pipe, and confused myself not realizing the trick up pipe is a complete new item not just the stock one ported which i still cant see making any difference as the restriction is still there,
but the 'harvey' up pipe tailor made to your car sounds a good idea.

i ran rcm set up on stock vf35 mapped by jgm and had a gain
powerstation ecutek mapped @ 330hp
same car jgm ecutek mapp with rcm headers and up pipe, swapped out hks to cosworth panel filter 343bhp

Still think to my original post £300 seems good price for the complete set up with gaskets.
and no its not my ad lol :)

scotty 11-01-2016 01:23 PM

Intrestesting topic this as looking at my next purchase ported headers with harvey trick up seems to be a good investment but then again so is rcm headers with harvey trick up pipe alot to decided on what route to take .

SpecB 11-01-2016 03:07 PM

It's a difficult call, I'd still say under 400 stick to ported OE (possibly with Grimmspeed cross over pipe) and a Harvey up-pipe, 400+ consider RCM and a Harvey up-pipe.

scotty 12-01-2016 04:10 AM

Is it expensive to get oem headers ported as ive not seen any for sale for a while now and of course Alyn you can send me a pm if you like for full set up including harvey trick up pipe .

2-jaffacake-tone 12-01-2016 01:20 PM

We ran a test a few years ago on a set of ported headers i did
13bhp 15fbt increase and bringing turbo spool down 400rpm.
well worth doing imo

scotty 12-01-2016 01:53 PM

Quote:

Originally Posted by 2-jaffacake-tone (Post 218477)
We ran a test a few years ago on a set of ported headers i did
13bhp 15fbt increase and bringing turbo spool down 400rpm.
well worth doing imo

Ooo like those figures .


All times are GMT +1. The time now is 01:17 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.