View Full Version : Exhaust system diam
Whats the best diam for a full race / rally system ?
entirely depends on the car/engine setup really, but for n/a i think 2 1/4" is favourable
entirely depends on the car/engine setup really, but for n/a i think 2 1/4" is favourable
230bhp ITB engine, what where the group a rally cars ? 2.5" ?
well a 2.5" system is all i'll ever need on the turbo i believe, should flow no problem upto 400bhp
no idea on rally cars am afraid mate
cliokongen
19-03-2010, 00:53
2,5"
I gained 20bhp from changing my previous system from 2" to 2,5" - and of course a remap. (before the ITB's)
Michael
cliokongen
19-03-2010, 00:54
2,5"
I gained 20bhp from changing my previous system from 2" to 2,5" - and of course a remap. (before the ITB's)
Michael
2,5"
I gained 20bhp from changing my previous system from 2" to 2,5" - and of course a remap. (before the ITB's)
Michael
WOW..! mine is 2" now and 230bhp mmm 250bhp here we come..!!!! LOL
Was going to get this:-
http://www.oreca-store.com/ligne-gr-a-renault-clio-williams-diam-egrave-tre-63mm-acier.html
zmaster2k
19-03-2010, 08:20
i sooo badly want an ocrea exhaust!!!
cliokongen
19-03-2010, 10:53
2,5"
I gained 20bhp from changing my previous system from 2" to 2,5" - and of course a remap. (before the ITB's)
Michael
WOW..! mine is 2" now and 230bhp mmm 250bhp here we come..!!!! LOL
Was going to get this:-
http://www.oreca-store.com/ligne-gr-a-renault-clio-williams-diam-egrave-tre-63mm-acier.html
You will see gains! - when mapping they can alter the ignition timing (advance it i guess).. Thats what they did on mine. He said the engine was struggeling to get rid of the gasses because of the small diameter exhaust. Torque was greatly improved as well in the entire range. Unffortunately i have no print out but it went from 178bhp to 198bhp.
Michael
sk84life
19-03-2010, 13:22
Does anybody have any experience with an Oreca system? Looks like quite a good buy for the rally car.
Dan
http://www.oreca-store.com/media/catalog/product/cache/6/image/9df78eab33525d08d6e5fb8d27136e95/g/r/gra_acier.jpg
Does look nice :D
looks like a scorpion someones painter gloss black :lol:
sk84life
19-03-2010, 15:12
Back box on scorpion is huge compared to the above!
Scorpion also has centre silencer, well mine does anyway...
Hmm, may buy one of these right now actually. Looks like a nice fit and with the design on the decat would mean less chance of blowing exhaust.
looks like my cup car system - cherry bomb silencer :lol:
sk84life
19-03-2010, 16:09
Hmm, may buy one of these right now actually. Looks like a nice fit and with the design on the decat would mean less chance of blowing exhaust.
Fancy organising another group buy? :wink:
i like the look of that too 8)
www.tonylawexhausts.co.uk
Has anyone tried this company,He custom makes "SYSTEMS" not just exhausts,ie Manifold the full Monty :wink: :wink: .
My mate runs a Toyota 1600 16v engine in his Datsun,he bought a custom manifold etc etc and the engine gave excellent power.Tony Law advised that the primaries etc etc were to small,and set about making a system,result more power ~~ I do not hink he his cheap ~ but as ever the best rarely is.
Most of the Rally people I know,buy from him
I hope it helps.
Rod
1000 for a fully system the above (albeit without manifold) is 235 quid.!!
Spoke to the today for mine but 4 week wait..still going to get one though my current system is 2" :oops:
sk84life
20-03-2010, 00:47
Nice one Evogone, you'll have to let us know how you get on with it, am very interested in getting one of these in the future.
1000 for a fully system the above (albeit without manifold) is 235 quid.!!
Spoke to the today for mine but 4 week wait..still going to get one though my current system is 2" :oops:
4 week wait for the Ocrea? Damn! I am having mapping done soon so I cant wait that long :(
1000 for a fully system the above (albeit without manifold) is 235 quid.!!
Spoke to the today for mine but 4 week wait..still going to get one though my current system is 2" :oops:
4 week wait for the Ocrea? Damn! I am having mapping done soon so I cant wait that long :(
If its give you 20bhp then i would wait 4 weeks lol..!
Whens you car going on the rollers..wheres the pics of the new engine..
1000 for a fully system the above (albeit without manifold) is 235 quid.!!
Spoke to the today for mine but 4 week wait..still going to get one though my current system is 2" :oops:
4 week wait for the Ocrea? Damn! I am having mapping done soon so I cant wait that long :(
If its give you 20bhp then i would wait 4 weeks lol..!
Whens you car going on the rollers..wheres the pics of the new engine..
All to be revealed soon enough :D
I may try one of the exhausts anyway and fit it later.
I know someone who has made a custom 3'' system for use on a h22 vtec build he has made good gains over a 2.5'' system .. different engines i know but similar power circa 220 hp atw now with cams and mapping.
I know someone who has made a custom 3'' system for use on a h22 vtec build he has made good gains over a 2.5'' system .. different engines i know but similar power circa 220 hp atw now with cams and mapping.
If i had a custome manifold mad up i would concider this but even the Maxi / Group A stuff was 2.5" and they made a lot more bhp than mine
Only problem with the Ocrea setup is when it's MOT time and decat needs to go back on...
Only problem with the Ocrea setup is when it's MOT time and decat needs to go back on...
Not if your car is on a H plate.. :wink:
Only problem with the Ocrea setup is when it's MOT time and decat needs to go back on...
Mine always passes its MOT ;)
Its arrived..!!!
3 weeks early, looks the dogs knowing my luck will fit it and will fail noise..!
Its arrived..!!!
3 weeks early, looks the dogs knowing my luck will fit it and will fail noise..!
DAMN I would have ordered it if I had known it was so quick and be in time for my mapping :(
Well I have sent them a message requesting if whether they can get this item to me or Stan by the end of next week... doubt it though :(
Steve, I had a 2" system on mine when I got it and going from that to a 2.5" system made a HUGE difference! That was a normal ITB setup, so with rods and pistons you'll deffo notice it mate!
Jon, did you notice the difference just swapping it over without mapping? If so I can manage with that for now :)
I'll probably order one of these in a few weeks. They just told me they wont have any in for 3 weeks now :(
cliokongen
26-03-2010, 13:14
Steve, I had a 2" system on mine when I got it and going from that to a 2.5" system made a HUGE difference! That was a normal ITB setup, so with rods and pistons you'll deffo notice it mate!
Jon, did you notice the difference just swapping it over without mapping? If so I can manage with that for now :)
I'll probably order one of these in a few weeks. They just told me they wont have any in for 3 weeks now :(
Just changing the exhaust is not enough
I could not feel the 20bhp difference at all before the remap.
Was quite gutted about that.
After the remap - what a difference! :shock:
Steve, I had a 2" system on mine when I got it and going from that to a 2.5" system made a HUGE difference! That was a normal ITB setup, so with rods and pistons you'll deffo notice it mate!
Jon, did you notice the difference just swapping it over without mapping? If so I can manage with that for now :)
I'll probably order one of these in a few weeks. They just told me they wont have any in for 3 weeks now :(
Just changing the exhaust is not enough
I could not feel the 20bhp difference at all before the remap.
Was quite gutted about that.
After the remap - what a difference! :shock:
You have quite a similar setup to mine, though yours is more bonkers. I wont be having a remap for some time so maybe I wont bother just yet :(
How are the ITB's!? Got any good vids yet? Hows the LSD?
Dont know wether to fit mine now as i may be out at Oulton on Wednesday or wait till i can get it on the rollers again...? :?
Steve, I had a 2" system on mine when I got it and going from that to a 2.5" system made a HUGE difference! That was a normal ITB setup, so with rods and pistons you'll deffo notice it mate!
Jon, did you notice the difference just swapping it over without mapping? If so I can manage with that for now :)
I'll probably order one of these in a few weeks. They just told me they wont have any in for 3 weeks now :(
Certainly did mate, the 2" system strangled it, so just changing it and no mapping it made big difference! I'd hold out on the mapping until you can get one tbh... or failing that, get your ar$e up North and I'll take you to see Wayne. Guarantee you'll be amazed with his ability, just a shame you couldn't have driven mine on the old map to see the difference really!
Well may get the exhaust next month, plop it on. Stan's going to do mine for now after he installs my cams, meggy head ITB's etc etc. which I am sure will be good enough even if I change exhaust. I probably wouldn't bother doing another mapping session unless I got a few more mods like manifold and exhaust at the same time really, or madder cams...or all of the above :)
Dont know wether to fit mine now as i may be out at Oulton on Wednesday or wait till i can get it on the rollers again...? :?
If you dont fit it, send it over to APD for me next week and my mapping session and I'll order you another from France :D
sk84life
30-03-2010, 18:08
Whats the verdict?
Whats the verdict?
Had to cancell getting fitted first thing in the morning then may pop to Oulton for a noise test..
Anyone know where I can get one of these Grp.A 63mm diameter exhausts from fast?
I can find Oreca 50mm ones but wanna go bigger.
mongoose are 63mm or its customs..though i believe bigger systems struggle over the rear beam...
100mm side exit..lol..
cliokongen
31-03-2010, 07:48
Anyone know where I can get one of these Grp.A 63mm diameter exhausts from fast?
I can find Oreca 50mm ones but wanna go bigger.
Why not have a custom system built to your spec.
In my experience the fit is often much better and you choose the quality of the material used to build it.
I might be a little more expensive but imo it is worth it.
Michael
A few snaps of my 2,5" system:
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning1.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning2.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning3.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning4.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning5.jpg
And downpipe :D
Thanks. I may not rush it then and just think about my options for now, settle for my 2" system.
I can take it to Prospeed in Cardiff and have a custom 2.5" system made in 304 stainless for about £350,,,,
Now fitted, its very snap crackle and POP....!
Performance difference yes but its wet so can not give a proper impression.
I can take it to Prospeed in Cardiff and have a custom 2.5" system made in 304 stainless for about £350,,,,
I'll give you a call later mate then and talk about my options seeing as we have a little more time to play with now Gripper are upgrading my diff.
If the exhaust is 2.5" but the mani and d/p remain the same will it still give decent gains? I was thinking of having a d/p made like clioking up there...or maybe the 4-2-1 Megane mani option would be better. Hmm! Questions questions :D
Ok lads, looks like I'm having a 2.5" full system made up by Pro-Speed now before the Williams gets mapped. We are looking at manifold and d/p options as well. I'm having it bypass the CAT completely.
Must be worth another couple of BHP, surely?
cliokongen
31-03-2010, 14:29
Great!!! :D
Justin..
31-03-2010, 16:53
man thats gunna be LOUD
man thats gunna be LOUD
Well, my current one is fookin loud as well. I don't want them to make it loud, but if it is loud then so be it.
I checked out other French exhausts and there is another Oreca exhaust in steel (inox) for Grp N, and another for Grp A (2"). There were some alternative manifolds as well but at about £450 they are too expensive.
Mines LOUD but not stupid, very happy with it.!
Makes some very loud bangs at 4k off and on the throttle....... :twisted:
Mines LOUD but not stupid, very happy with it.!
Makes some very loud bangs at 4k off and on the throttle....... :twisted:
Excellent, I want 4k pops and bangs as then I dont need to rag the shit out of it to scare pedestrians and people with their windows down on the motorway (love doing that).
Right. GOT A MEGANE MENIFOLD NOW AS WELL :D
It will do.
So: Manifold - bespoke d/p - Grp N 2.5" exhaust with no CAT.
I want: not too much noise at low revs for pootling about, flames, and pops etc at mid and high revs and d/p as far away from driveshaft gaiter as poss...probably worth heat wrapping it tbh.
This should solve any gas flow restriction I have in time for my mapping session?
Fit the exhaust before mapping as mine has a slight flat spot at 3-3.5k...
dont forget u will need a cat on come mot time
Friendly mot tester of love.
dont forget u will need a cat on come mot time
Not for mine being on a H... :wink:
im talking to wobba evo :winkey:
1 August 1992 u need a cat
Ok lads, looks like I'm having a 2.5" full system made up by Pro-Speed now before the Williams gets mapped. We are looking at manifold and d/p options as well. I'm having it bypass the CAT completely.
Must be worth another couple of BHP, surely?
good choice .
charlie @ prospeed fitted the s/s system on my 9 .
he is a top bloke and surely knows what he is doing 8)
Why not have a custom system built to your spec.
In my experience the fit is often much better and you choose the quality of the material used to build it.
I might be a little more expensive but imo it is worth it.
Michael
A few snaps of my 2,5" system:
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/25udstdning.jpg
like that downpipe :P
whats the diameter of it ? whats the advantage of it being
a single pipe opposed to twin on standard valvers ?
Yes Northy thanks for the advice. I am aware of the implications with the CAT. I'll replace the whole system each year if I have to.
Pro-Speed, aye, heard very good reports all round.
It's early stages but the plan is to get the car to cardiff on the back of Stans loader, and have Charlie fabricate a decent downpipe from the Meggy manifold and create a new 2.5" bore 304 steel exhaust. This way there will be minimal restriction of exhaust gasses. Hoping it wont drop too much low down torque, but I am sure with ITB's and all the other stuff any losses can be mapped out...doubt I'l be short on ponies tbh.
I'd like to wrap the d/p and manifold as midge has had an issue with it setting fire to the CV boot with Meggy manifold on (using a valver d/p I think).
Looking at Clioking's backbox. Nice. I am probably going to request a bit of a motorsport/slag look pipe exit...not the slanted downward style as I want people to get barbecued by my flames so I'll ask for the same base metal type finish as above but cut straight like most exhausts and bare metal rather than gay polished metal.
Yes Northy thanks for the advice. I am aware of the implications with the CAT. I'll replace the whole system each year if I have to.
tell u something i couldnt be bothered with that lol.
Yes Northy thanks for the advice. I am aware of the implications with the CAT. I'll replace the whole system each year if I have to.
tell u something i couldnt be bothered with that lol.
Northy lol u wimp. I thought you were hardcore!
Also mate, have you got a close-up pic of the end of your exhaust? Is it a Devil exhaust? Just weighing up my options for the look of my backbox.
tbh i love the look of the downswept one.
But do you fancy a round tailpipe squashed into a oval slash cut ?
what on my cup racer ?
yes
tbh i love the look of the downswept one.
But do you fancy a round tailpipe squashed into a oval slash cut ?
The downswept look is used on some motorsport clio's and other cars, I know, but I dont want that.
I want a round normal exit pipe but free of the rounded off end and just straight cut. Like Cliokongens, but cut vertically. Undecided if I want the outside poliched or not really....hmm...slag or not to slag?
cliokongen
01-04-2010, 22:14
Why not have a custom system built to your spec.
In my experience the fit is often much better and you choose the quality of the material used to build it.
I might be a little more expensive but imo it is worth it.
Michael
like that downpipe :P
whats the diameter of it ? whats the advantage of it being
a single pipe opposed to twin on standard valvers ?
It's 2,5" - now 4-1 configuration.
It fits my Devil Manifold which I have always thought of being restrictive when looking at the design. Sort of like - 4-1-2-1.... Strange - and with bad welds..
I have a Megane Cup manifold which is 4-1 and this gave a very nice/wide powerband on a Megane. Primaries seem a little bit bigger on the Megane Manifold compared to the Supersprint next to it. Supersprint is similar to the Devil. Inspired by the Magane manifold i decided to change the downpipe on the Devil.
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/EliaSupersprintogRenaultSportman-1.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/EliaSupersprintogRenaultSportmaninf.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr06.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr07.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr09.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/IMAGE_449.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/IMAGE_447.jpg
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/IMAGE_526.jpg
what car is this downpipe from ?? any ideas on diameter ?
will it mate with the valver log manifold ?
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr07.jpg
cliokongen
07-04-2010, 20:33
what car is this downpipe from ?? any ideas on diameter ?
will it mate with the valver log manifold ?
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr07.jpg
It's a stainless (dirty) Devil downpipe...
Will not fit the Valver manifold.
Diamater is a little less than 2,25".
Michael
what car is this downpipe from ?? any ideas on diameter ?
will it mate with the valver log manifold ?
http://i50.photobucket.com/albums/f312/Cliokongen/Getting%20ready%20for%202010/Forrr07.jpg
It's a stainless (dirty) Devil downpipe...
Will not fit the Valver manifold.
Diamater is a little less than 2,25".
Michael
do you know of any downpipe that will fit the valver manifold
and is a bit less restrictive ?
cliokongen
08-04-2010, 08:14
I don't think there is anything available.
You will have have a custom downpipe made if you would like to keep the valver manifold.
Michael
you can run a williams manifold on a valver down pipe
cliokongen
08-04-2010, 11:27
But does it flow any better?
you can run a williams manifold on a valver down pipe
so it works the other way around as well ?
can i use a williams downpipe on valver log manifold ?
TALK TO ME BOSS !!!!
Ok, due to time and not wanting Stan to take any longer with my build, I've cancelled the hand made exhaust and downpipe with Pro-Speed and have today ordered anotehr exhaust to use in the meantime, which is the Ocrea one Evogone has on his rally car, previously photographed.
Evo says it knocks about on the rear beam sometimes so I've also invested in some polybush exhaust mounts which are much stiffer (and a bitch to get on lol) than normal and down expire after a few weeks like the normal shite.
He also says it pops and bangs loads, like my 2" already, but I like that :)
When I decide to do the downpipe I may have a full system and manifold made as well, bought a megane one the other day but I doubt I will use it now :(
Still, should be fun and will let me have a 2.5" system on for when Stan does his mapping, which is promised to be done the week after next.
Assuming car is ready I am then going on holiday to see my family in the Willy...think they are going to love me parked ion their drive shooting flames lol.
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