| discuss: split downpipes for turbocharged cars? - Click HERE for Original Thread |
| SaabKraft |
i've come across a few of these, it's a downpipe where the exhaust gas and wastegate blow-off enter the pipe at two separate ports, and merge a ways down the pipe, so a slender one beside a fatter one, with an eventual 'Y' junction.
i'd assume it'd only be of benefit in the higher RPM range, when there's a higher volume of higher temperature gas flowing from the turbine; the flow needs to be as smooth as possible near the blades, without undue turbulence due to wastegate discharge.
would this benefit a smaller turbocharger more than a larger one, because of temperature differences? |
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| crazyrx7 |
Its called a "divorsed wastegate" downpipe. The theory is that the 2 flows (exhaust and wastegate) don't merge until later on to reduce the exhaust turbulance from the 2 allowing better flow. To me it won't make a difference unless your in the very high hp range. There has been dyno tests on this and they haven't got anymore horsepower from the divorsed type and a normal dp.
As for temperature it will stay the same because both have exhaust flowing through there.
R.K. |
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| BlueTurboEGG |
I've always been a firm believer in the seperate wastegate dump tube...
If you don't plumb the wastegate dump back into the exhaust there is literally no interruption of the flow :D |
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| notaturbotalon |
| Dump the wastegate to the atmosphere, it's what all the cool kids are doing. Sounds good too.:) |
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| Kris |
| People mainly do it to reduce noise. If it is dumped back into the exhaust it just goes out the muffler. But if it is dumper to the atmosphere then it can be noisy. |
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| ManHunter |
Of course, venting it out bypasses the cat converter... which doesn't sit well with the law. :D
MH |
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| BlueTurboEGG |
A few things about External dump wastegate
1- It's only noisy when you hit max boost (something you shouldn't be doing too often anyways :P )
2- There are no emission controls as of yet in Alberta.
3- There is pretty much no disturbance in exhaust flow with an external dump, but until this can be compared to side by side on the same vehicle, this advantage/idsadvantage I suppose would be moot.
4- It made a rather noticable difference on my car ;) |
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| Ron@Revolution |
| I know there is power to be made by external dump many v8 guys have proven this. |
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| Pro Drag |
quote:
Originally posted by Ron@Revolution
I know there is power to be made by external dump many v8 guys have proven this.
Links? Average % increase in power seen? |
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| ManHunter |
The FMax turbo kit for integras claims 40hp more with external dump.
MH |
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| Ron@Revolution |
quote:
Originally posted by Pro Drag
Links? Average % increase in power seen?
No links just conversations with a friend, and his 7 second twin turbo Regal!:bthumbup: |
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| Ron@Revolution |
| To talk averages is stupid! Every configuration is differrent and every motor, turbo, angles, and size of exhaust changes so would the power gains. :dunno: |
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| notaturbotalon |
quote:
Originally posted by BlueTurboEGG
A few things about External dump wastegate
1- It's only noisy when you hit max boost (something you shouldn't be doing too often anyways :P )
If you try it with a crappy wastegate or an internal wategate that doesn't close completely your car will sound like a beater when you idle.
Depending on your dump tube, it may fill your engine with soot.
With mine I have absolutely no boost creep or spiking issues, my turbo's design and O2 housing probably also help this though.
It's not as noisy as people think, I can't even hear when mine opens from inside my car. |
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| Praylewd powr |
| You have to remember it will depend on the configuration like Ron says. If you run a big turbo at 8psi on the street, your WG is going to be dumping a huge amount of pressure=loud but not unbearable. |
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| notaturbotalon |
| I thought my turbo was pretty big. |
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