Venting w/g externally

[cat007]

Hey all

I currently have my external venting to the atmosphere as I LOVE the sound of it, mainly because its not some pokey 4 pot

But anyway, I’m going to be getting a cert for the car, AGAIN, and of course venting externally isn’t ‘legal’.

Other than running a piece of pipe all the way to the rear of the can so I can still have that sound – what other solutions have I got? I only have a 2.5” exhaust – so unsure if plumbing it back in will work for the power output the engine will be making (+400hp)?

How far back would the pipe have to run for it to be legal? Last opening door, or window isn’t it? So the boot doesn’t count? So in theory it could go back to just in front of the rear wheels?

And please don’t give me shit about having it venting externally. I like having 2 different exhausts tones depending on how much I’m leaning on the engine…

Cheers

Hunt

[gasman]

plumb it back in but make it removable so that after cert and wof time u can bolt your screemer back on. at least thats what i did.

try and plumb it back down the exhaust as far as possible away from the turbo.

on my car there is a noticable difference in power with it plumbed back vs vented.

[tsoob]

plumb it back in but make it removable so that after cert and wof time u can bolt your screemer back on. at least thats what i did.

try and plumb it back down the exhaust as far as possible away from the turbo.

on my car there is a noticable difference in power with it plumbed back vs vented.

what he said!!

yeah youll find the cert/wof guys are pretty clued up on this type of setup now and even some of the police 2 so be carefull.

oh and just for fun chuck a screamer on it eoh

[cat007]

plumb it back in but make it removable so that after cert and wof time u can bolt your screemer back on. at least thats what i did.

try and plumb it back down the exhaust as far as possible away from the turbo.

on my car there is a noticable difference in power with it plumbed back vs vented.

what he said!!

yeah youll find the cert/wof guys are pretty clued up on this type of setup now and even some of the pigs 2 so be carefull.

oh and just for fun chuck a screamer on it eoh

I thought a "screamer" was just the fact that the wastegate vented externally?


Would there be any restriction/performance issues with having the external plumbed all the way back (following the main exhaust) and venting after the last opening....?

[bluemaumau]

plumb it back in but make it removable so that after cert and wof time u can bolt your screemer back on. at least thats what i did.

try and plumb it back down the exhaust as far as possible away from the turbo.

on my car there is a noticable difference in power with it plumbed back vs vented.

what he said!!

yeah youll find the cert/wof guys are pretty clued up on this type of setup now and even some of the pigs 2 so be carefull.

oh and just for fun chuck a screamer on it eoh

surely if you have it plumbed in tho it doesnt matter

they cant fail you becuase theres a few flanges on the wastegate pipe

[cat007]

surely if you have it plumbed in tho it doesnt matter

they cant fail you becuase theres a few flanges on the wastegate pipe

Yeah you might be onto something - I guess I'll have it plumbed in and then maybe make up some sort of bypass system for later....

[mjrstar]

My car made 245kw with the external plumbed back in on the 2.5'' crush bent pipe.. sure it made 15kw more the rear section of the exhaust unbolted, but that's another story..

As for venting to atmo personally i do not like the idea unless you have a dedicated drag car... but my mates evo 5 had a decent setup which basically meant he could have it either plumbed back or atmo by inserting a blanking plate and removing a connecting pipe. it was about 8'' long and flanged at both ends and ran from the w/g bak to the exhaust.. was about 15min to remove/refit.

when i got my evo4 it has a certified exhaust (under 95db) and it had a external venting w/g with a blanking plate.. this is not ideal as the car basically has the ability to freeboost.

[cat007]

My car made 245kw with the external plumbed back in on the 2.5'' crush bent pipe.. sure it made 15kw more the rear section of the exhaust unbolted, but that's another story..

As for venting to atmo personally i do not like the idea unless you have a dedicated drag car... but my mates evo 5 had a decent setup which basically meant he could have it either plumbed back or atmo by inserting a blanking plate and removing a connecting pipe. it was about 8'' long and flanged at both ends and ran from the w/g bak to the exhaust.. was about 15min to remove/refit.

when i got my evo4 it has a certified exhaust (under 95db) and it had a external venting w/g with a blanking plate.. this is not ideal as the car basically has the ability to freeboost.

Surely thought just having the w/g blanked off the LVVT guys would know what's what and would say something about it?

[mjrstar]

i would have thought so too, but i have the paperwork.. i guess with it blocked off it is 'legal' but as soon as you take the blanking plate off you no-longer comply with the paperwork. it states 'blanking plate on external w/gate' i'm pretty sure.

[cat007]

i would have thought so too, but i have the paperwork.. i guess with it blocked off it is 'legal' but as soon as you take the blanking plate off you no-longer comply with the paperwork. it states 'blanking plate on external w/gate' i'm pretty sure.

Well I'll get it plumbed in for now - then have a chat with the LVVT guys and see what's what.

I really need a new exhaust anyway - well at least a new rear muffler as mines pretty old and I would imagine restrictive lol

[deaf_rattle]

vented sounds like ass.
just plumb it in.

[Boosted_162]

I have my external with a screamer, then i have a bolt in section to join into the exhaust. Definately the best idea IMO. And if they ask about the flanges, just say they are required as for installation. If mine was welded in, it would be impossible to remove unless the whole motor comes out.

[iOnic]

Nothing illegal about having an atmo venting WG on an MR2 - it exits behind the rearmost opening door

Having a flange in it isn't legal but most WOF guys won't pick up on it. You're not allowed to have any removable components that alter your exhaust noise (bolt in silencers etc)

[fangsport]

Cat 007, i suspect you do a wee bit of trackwork, therefore, build the highest performance plumb-back or separate WG exhaust. it would be a rude feeling, knowing you were fastest on the day, only to be excluded for a non-compliant car , aye.
Cert guys/ cops etc may not notice, but MSNZ tech guys are usually on the case

[drftdr]

Im venting my wastegate to just in front of the passengers rear tyre.
On a 180sx, with no rear seats due to half cage.
As said above you could have a blanked of flange so can vent or flow back into the exhaust.
This is on a Rb25det by the way

[cat007]

Cat 007, i suspect you do a wee bit of trackwork, therefore, build the highest performance plumb-back or separate WG exhaust. it would be a rude feeling, knowing you were fastest on the day, only to be excluded for a non-compliant car , aye.
Cert guys/ cops etc may not notice, but MSNZ tech guys are usually on the case

Yeah - I totally see where you're coming from, and you're right. Its not worth the risk really....

When you say a seperate exhaust - would it need to be silenced/muffled?

I would like to run a seperate 1-1.5" pipe from the wastegate right to the back, and next to the main muffler - like on the Ferrari F40

But I guess I'll talk to the LVVT guys and see what they say.

Cheers

[tsoob]

I have my external with a screamer, then i have a bolt in section to join into the exhaust. Definately the best idea IMO. And if they ask about the flanges, just say they are required as for installation. If mine was welded in, it would be impossible to remove unless the whole motor comes out.

i hear that a pretty mean set up 2

[Boosted_162]

I have my external with a screamer, then i have a bolt in section to join into the exhaust. Definately the best idea IMO. And if they ask about the flanges, just say they are required as for installation. If mine was welded in, it would be impossible to remove unless the whole motor comes out.

i hear that a pretty mean set up 2

Got a mean downpipe too

Just need a new motor now

[IH8TEC]

just plumb it in, i didn't think i'd like mine at first, but the car sounds soooooo much crisper with the external plumbed in. i think it reflects the sound of a racecar better.

it took me a while to get used to because if i heard the screamer i knew the boost controller was working haha. now i just trust it. i had to get it plumbed in for my cert also.

[slammed_integral]

sounds awesome and if you dont think so your too pc