*Sonic*

Anyone ever fitted these?

Im looking at fitting them to my MY00, along with VF24 Turbo

wondering what sort of gains I can expect (with the correct remap of course)

Steve

marcevo1

equal headers (exmanifolds) do not work that well on turbocharged cars (trust me i have done alot of research on this)

Tuned length works great with normally aspirated cars where the exhaust pulse is 'tuned' - turbos mix the pulse up and defeats the object.

tubular headers increase the power out put and depending on diameter dictates ultimate bhp or where the torque comes in.

better to save the money imo

Fatman

If they didn't work well, why would Subaru fit them to their new high-end Imprezas (Spec-C)? Also, why would WRC teams use them? I think Steve's question was whether anyone had used Syms headers (versus any other brand) -- rather than whether or not he should use equal/unequal length headers.

Sorry, Steve, I've not heard of that brand.

chrome

bttt for the hedgehog

greasemonkey

Oh really? You'd better tell Subaru that as they seem to be missing something...

Subaru and Prodrive have also likely done a bit of research, and they reckon equal length is better. I'm prepared to accept that view.

Equal length headers even out the time intervals with which exhaust gas pulses hit the turbine blades, allowing the gas to impart more energy to the turbine, and also reducing back pressure. Can't you see the value in that?

*Sonic*

my thoughts exactly, if SWRT use them , and the big power boys on here. they must be better for something

I know these have smaller Primaries than the likes of Gruppe-S and similar, but really looking to see what sort of difference they would make (apart from looking better
and not corroding like my OE ones are (at least the heat shields are) the up-pipe is also part of the headers too (on the Syms ones)

Steve

chrome

ah good- I can have my OE up pipe back


one OE upipe and OE headers FOR SALE !!!!

/hijack :P

*Sonic*

PMSL

I havent got the headers yet mate

You seen my thread Chrome in Gen Tech ? on smelly brakes ?

harvey

iTrader: (48)

I don't know anybody using Syms equal length on a road car successfully.
What is good for a WRC car is not necessarily the best option on a road car which has a completely different power band and no restrictor.
There may be better performance options and more cost effective turbos than the VF24. TD05 F.E. or 05-06 20G depending on what you want to achieve.
Gruppe 'S' and the like are unequal length, tubular headers. Put them on a TD04 equiped car and it will loose performance but on an 06 or similar big air mover the gains can be very rewarding.

*Sonic*

Cheers Harvey

the Headers are currently on a 95 WRX Auto , and the Turbo came off an '02 Bugeye (Cypriot Import)

Ive been offered them at a good price, I already have full decat, STi Intercooler, Green Cotton Filter, and AE 800 ECU

My Current Headers & Up-pipe either need replacing, or at the very least the heat shields need replacing (if possible) as the up-pipe weld joints on the heat shield have snapped, and the headers heat shield are corroded

Steve

NM

No idea on the headers but I have a VF24 turbo fitted to my UK MY98.

Along with

440cc injectors
Full decat
fuel pump and regulator
uprated spark plugs
AP clutch and lightened flywheel
PE Phase 2 remap

311BHP and 290LBF on PE rollers

Cheers

Neal

Crusty

I have Sym's headers on my STi 3 powered MY93 RA. These are the second set I have tried and are definatly biased for high RPM work, the first set were unequal length with much smaller pipe work and had incredible mid range power. With the Sym's I noticed a drop in torque with the standard VF23 but I'm planning to fit a TD-05/06-20G to compensate !
I have a few pix taken on the day they were fitted..

http://groups.msn.com/IMPREZAWRXPhot...to&PhotoID=390

Cheers, Mark.

sonu

I've got Gruppe-S headers and a TD04 on a UK '99, mapped with link:

280BHP, 305lb ft at PE

Thanks

Sonu

Bob Rawle

Depending on which design and which head's are on the car will determine how they perform, for example the SYMS or Maxim equal length work very well on a Eurospec car due to head/cam combination however they do not work on an STi for the same reason, non-equal length seem to work well on almost anything but best on an STi again due to head/cam combination, header primary diameter has a big effect and so does the up pipe(s) design.

Subaru have done virtualy no work on the normal aftermarket type ... the design of the latest spec system on the 03 JDM cars is not the same at all. That could mean, I suppose, that they did the work and discarded the result but you can't read across anything from the latest Subaru designs to the historic aftermarket designs, they are chalk and cheese.

Its fair to say that I am not a fan of equal length pipes, non equal length work better under virtually all circumstances imho however the latest stuff is better even than that.

You could do worse than fit a set of those to a GC8 with an up pipe modified to accept a non twin scroll turbo, for example. However, again, head/cam combination ... especially the VVT plays a big part.

bob

greasemonkey

Are you considering having a 2:1 up-pipe made to adapt the new Subaru headers to another turbo for the next phase of your STi9 project Bob? Would be interesting to see how those headers work with a single scroll turbo of known performance.

dowser

I run the Maxim equal length headers (didn't realise they were the same as the Syms). I prefer the iON design for outright power, I'm having to work things much harder to get the same level with the Maxim on a TD05, but they're still a big improvement over stock (IMHO ).

They seem to work better with a VF23, and are also good with a TD04. I just think they're ultimately limited in flow - small diameter pipework compared to iON.

iON's will go back on with EJ25.

Richard

PS: Bob - I'm doing a GC8 tonight with the headers, up-pipe, sump and turbo from a twin scroll. Any advice

*Sonic*

Thanks all the info

My car is a GC8 MY00 EU Spec Turbo (read UK td04 etc)

From what I can gather the Syms has the up-pipe built in

vulnax999

iTrader: (7)

So how did it go Steve ?

Or did you change your mind ?

Neil

carlos_hiraoka

Please let us know what were the results like, as we will be mapping a GC8 (MY98) also with the whole twinscroll setup but with one of PE twin scroll turbos (think it is a PE 1825 .....)

Carlos

carlos_hiraoka

BTW I remember that one of the new JDM Legacy's with a twinscroll setup was going to come with a TD05 turbo instead of a IHI unit, anyone knows the specs of such unit ?

*Sonic*

I didnt get them in the end, as my garage roof needed replacing, so came on the onset of insufficient funding

Oh, and my garage got robbed, and all my tools & tool chest nicked