Overboost after porting wastegate

[steve matthews]

steve - you got it

[ccb056]

Steve's got a point.
If the downpipe throws off the balance between core - and wastegate flow... There's no use in porting over say, 21mm.
In my treat i allready suggested that piper needs to add a deflector for the wastegate flow, just like the original lump . I'll go have a talk with my welder first...

The pre car eliminator keeps the flow directly after the turbo intact since it uses the original downpipe. So everything points to this, hence the clever but expensive design of the Knox pipe!

Don't worry, we'll solve this together, but perhaps it is wise to keep everything in one treat ?

I'd be interested in any pictures of the deflector after your welder works on the downpipe.

[HJ2]

So am I !

When the time is there, i'll post a few pictures, as usual!

[whippit]

Sorry i think my post came across as a little blunt,
i'm clueless on the math's of all this, i'm just looking at my setup, with just the 2'5 fitted i had overboost, but a big increase in power,
my car is the same as your's , i only fitted the eliminator because i thought the flow from the original would cause some turbulence ,
it did help the overboost , but didnt get rid off it totally, i do agree looking at it logically it must be the down pipe,

in lay man's terms is overboost restrictive flow in the downpipe or the opposite ?

[ccb056]

overboost is caused by not enough flow through the waste gate

[steve matthews]

overboost is caused by not enough flow through the waste gate