external wastegate

[avinesh]

just wana know if the externals pipe goes all the way to the back together with the exhaust pipe will it still be illegal??? Any performance advantages???

[escortman]

for the amount of work to make another full exhaust why dont u just plumb it back in?

[Dell'Orto]

It'll still be illegal if its noisy.

[l1ttle_d3vil]

It'll still be illegal if its noisy.

but don't externals need to be plumbed back in because they vent exhaust gases infront of the drivers cabin?

so technically it would be legal if it was vented at the rare of the car, and externals can't be any noisier than most BOV's.

[Dell'Orto]

and externals can't be any noisier than most BOV's.

Are you serious???

[xsspeed]

They dont call them screamers for nothing.

TBH it would be a waste, if you cut cost and use small diameter pipe you are going to get too much pressure build up. If you use a big pipe you might as well put it into the larger exhaust pipe anyway, plus that way it will be muffled and legal

[avinesh]

They dont call them screamers for nothing.

TBH it would be a waste, if you cut cost and use small diameter pipe you are going to get too much pressure build up. If you use a big pipe you might as well put it into the larger exhaust pipe anyway, plus that way it will be muffled and legal

thing is the guys who are doing my single turbo set up said they can run it all the way to the back for no extra cost......the external is 46mm an the pipe diameter is bigger then that will that cause back pressure????

[xsspeed]

I've never personally seen a system like that, so not sure of the legalities, I guess its just like having a dual exhaust system in that sense.

I would have thought plumbing it back nito the main exhaust would be cheaper.

I can't see any benefits of having a dedicated pipe going all the way back, other than to be able to say "thats my screamer pipe, and yes it is legal Mr. Officer"

As for the pressure created I don't know what the key values are for a rule of thumb for external wastegates, only the principle.

The more turns you have th ehigher static pressure you have to overcome to push air/gas out, the higher the flowrate out of your wastegate and the smaller the diameter of pipe, the higher the velocity, and so velocity pressure will also increase.
These will work against the desired effect of the external gate venting to release pressure, or the gate will need to open further.

How much it will effect I am not sure.

If it was me I would plumb it back in, the cost of a section and welding in the exhaust is pretty minimal compared to failing wof/cert/green sticker etc etc IMO

[IH8TEC]

lets put it this way, since i plumbed mine back into the dumppipe, i got told by my tuner that if i wanted more response that i should upgrade to a 3inch dp from 2.5"

i have seen them run right to the back, it's not as common but has been done, normally not just for the cost factor.

[method]

dont be a try hard, plumb it in.

If it is run to the back it will need to be muffled, like all exhaust systems. After all that is exactly what it is, nothing more nothing less. No losses or gain, it is after all it is waste exhaust gas... duh. And in IH8TECs case, if your exhaust is restrictive it will need to be upgraded anyway, nothing to do with plumbing it in.

[touge rolla]

I've never personally seen a system like that

Really, they're becoming increasingly common down here, see them everywhere. If it's not too loud it will be fine, no advantages though other than noise (which is also a disadvantage). Save weight just plumb it back in.

[xsspeed]

I've never personally seen a system like that

Really, they're becoming increasingly common down here, see them everywhere. If it's not too loud it will be fine, no advantages though other than noise (which is also a disadvantage).

Can't say that I have been looking specifically but no hadn't seen a system like this, obviously seen the illegal screamers poking through the bumper or what have you

Save weight just plumb it back in.

Was thinking this also forgot to add it, esp if as method says you add yet another muffler etc.

As method also says, you are not producing any more exhaust gas magically cos you have an external gate, the gate still just vents it pre turbo, controlling spool and boost, so if it goes back to the exhaust pipe it should be sweet cos the exhaust should be sized for it anyway

[Lloyd]

What method said

[avinesh]

k went an saw the car today asked the guys doing the work an they told me thay asked a certifier if its legal an they were told yes as long as it exits properly an wont enter back into the car

[Lloyd]

And isn't loud and has a form of muffler in the system

[rollaholic]

its a stupid idea, theres no reason not to plumb it back in.

sounds like you are already sold on it tho, so why bother asking us

[avinesh]

And isn't loud and has a form of muffler in the system

yea i asked then to plumb it in but their confident its legal i told them i dont want a pink sticker on my car

[groupagt4]

just run it the way you want man. i got mine plumbed in to save weight and keep the rear of the car clean. have seen it run to the rear in a pretty serious sti track car and it wasnt loud at all so noise shouldnt be an issue

[avinesh]

just run it the way you want man. i got mine plumbed in to save weight and keep the rear of the car clean. have seen it run to the rear in a pretty serious sti track car and it wasnt loud at all so noise shouldnt be an issue

yea i think it coming all the way back will reduce noise

[Dell'Orto]

Pipe doesnt really reduce noise that much, it'll be marginally quieter as the exhaust gas wont be so turbulent but it'll still be rowdy.