Loss Of Power With External Gate

[RIP85]

Just out of curiosity who has run a external gate off there exhaust housing on a gtx35/82 and lost power compared to the internal gate been told this is a common issue

[ScatterBrain]

It depends where the gate is plumbed into the housing, The further around the housing the worse it gets. I've seen a loss of 30kw on a car just from the gate position.

[RIP85]

<br />Yeah exactly my car is down 30 rwkw <br />

[senna_T]

Yeah, that's why... Where the flange has been placed is no good for exhaust flow, that is asking the exhaust to build up in the rear housing and then do a 90 degree turn back against itself to get out to the gate.

It really needs to be flowing in the same direction as the exhaust gases so when the gate opens there is a smooth gas flow back in to the exhaust

[RIP85]

30rwkw down on 6 psi more boost I'll just get tuner to smash more boost very expensive exercise to make less power

[RIP85]

Yeah, that's why... Where the flange has been placed is no good for exhaust flow, that is asking the exhaust to build up in the rear housing and then do a 90 degree turn back against itself to get out to the gate. <br /> <br />It really needs to be flowing in the same direction as the exhaust gases so when the gate opens there is a smooth gas flow back in to the exhaust

<br />It is on a low mount 6 boost manifold so turbo is mounted upside down

[senna_T]

Yeah but imagine the way the exhaust gas flows, to have the flange at a right angle like that means that it's going to come from the manifold and start following the rear housing around to the turbine but before it gets there it is running in to a wall half way around. I'll try to find a photo of what I think it should be.

[RIP85]

Yeah I understand what your saying in the years of modding cars I just have had them off the manifold and never had a problem thanks for your help just bit pissed I went on some wrong advise

[senna_T]

This is kind of what I'm talking about, see how the pipe has been cut to flow the gas straight from the flange at the merge collector?

[senna_T]

Pain in the ass I know, but if you can get a new rear housing and have this done I think you would see the benefits of holding solid boost curves with the external gate