Great read on separate wastegate pipes and turbocharged engines exhaust theory.

**4WheelDrifter** · 24 January 2005, 19:26

Cheers Mihnea. So a large diameter exhaust won't hurt the stock setup, but will be a big advantage if I ever want big power.
Hmmm..... How much ground clearance have I got? I'm sure I saw some 6" stainless kicking about somewhere!

**Mihnea** · 24 January 2005, 19:39

6", bring it on 4WD

And I thought some people had gone nuts when we started talking about 3.5" or possibly 4"

Mihnea

**4WheelDrifter** · 24 January 2005, 19:44

Uh. On second thoughts...

That might be a bit tricky. **** it! A stack going straight up through the bonnet might be the answer!

**robo** · 24 January 2005, 19:47

Ok I will not be joining wg pipe with dp then, can any one suggest small silencer for wg pipe maybe motorbike one???

_______
Rob

**s2_southwest** · 25 January 2005, 00:30

From what i understand (which is not a lot) of the seperate WG pipe, the idea is to have it as seperate as possible, i.e. does not join to the main exhaust or DP...

And people have been complaining about the noise from seperate pipe, why cant the pipe join in just before the rear silencer, rather than having a sperate silencer for the WG pipe. This way it does not join onto the DP, and should reduce some of the noise...or am i missing the point completely

lol

**martinjs** · 25 January 2005, 05:33

Think that sort of defeats the object a bit lol
The idea is to keep it completely seperate so it doesnt interfere with the flow of gases in the main exhaust.
Im sure a small silencer will be fine, but im gonna try one without first, maybe get it sorted at the garage meet if i get all the required bits.

**Erikb** · 25 January 2005, 12:10

Very interesting article, thanks for sharing Mihnea.

Does someone already know if it will pass the MOT test?, I think it will need a catalytic converter and a silencer to pass.

**robo** · 25 January 2005, 18:13

I think if you have just pipe coming out, then you can say is dump valve?? :mischeif:
It would be bit tricky to explain when with silencer.
______
Rob

**audiman** · 25 January 2005, 18:55

AS long as it doesnt blow, which it wont when MOT testing then it doesnt fail. If an MOT tester tries to fail it, then appeal.

**4WheelDrifter** · 25 January 2005, 20:25

I'm not sure what an MOT tester thinks he's doing, if he gets your WG pipe to make a noise. Have they got a rolling road in the testing bay?

**NoNonsense** · 25 January 2005, 20:38

RPM and boost wouldn't be high enough unless the MOT tester is revving your car like you would

**audiman** · 25 January 2005, 20:49

when you MOT an S2 you have to drive it to test the brakes as its perm. 4wd you shouldnt put it in the brake roller tester. But we arent allowed to drive fast 30mph ish. But then some people will thrash customers car when the come into the garage. Not me, cos i know that if someone did that to my car i would be very very angry.

**S2central.net** · 25 January 2005, 20:57

Originally posted by Mihnea

http://www.tantrumwerks.com/html/Spl...t%20theory.pdf

Hey some nice new thoughts in there for me. The logic seems sound with free-er flowing exhausts improving VE for our turbo engines. Reality seems to agree with that also when power and torque gains can be seen with a bigger exhaust using the same ECU software. The engine flows more air (higher VE) and therefor produces more torque at the same boost levels...

Bet this guy can read turbine maps

Paul

**maRS2** · 25 January 2005, 21:40

I see that you guy 's start to look at the scooby forums!!! lol
This one was one year ago on nasioc forum

Great read on separate wastegate pipes and turbocharged engines exhaust theory.

Great read on separate wastegate pipes and turbocharged engines exhaust theory.

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