Dyno data?? DDP reroute vs. Std. 3" DP

[prsrcokr]

Is there any dyno data comparing a rerouted DDP and open DDP to a standard 3" DP?

I'm wondering if the downstream merge of the two flows (turbine and WG flows) will cause more turbulence than a standard 3" DP which merges the flows at the opening. Just looking for comparison numbers on these.

Thanks,
Brian

 

[JustAnotherVictim]

The whole point of the ddp is to eliminate that turbulence.
You'd probably have to ask Randy (BecauseIcan) if he has anything on dyno sheets.

 

[prsrcokr]

Anytime you're merging flows you're introducing turbulence, I'm just wondering if there is less than with a "wide mouth" standard 3" pipe?

Thinking that the flow may have smoothed some in a DDP and then the WG line is introduced, creating turbulence again. If the WG line were to atmosphere, yes there'd be no turbulence from merging.

 

[JustAnotherVictim]

You basically looking for info on the rerouted ddp instead of the open.

The flows never merge in an open ddp. The rerouted ddp is supposed to smooth the flow since the point and which they merge is more of a straight line area.
So yes there will be a bit of turbulence but not as much as a standard dp.

 

[Bigdough666]

I thought the entire point of the DDP is to reduce turbulence at the back of the turbo, since it seperates the exhaust wheel and the wastegate area.

 

[JustAnotherVictim]

It is.
You will still have some turbulence when the flows reconvene later on in the piping. It just won't be as much disturbance as before.

 

[Bigdough666]

It is.
You will still have some turbulence when the flows reconvene later on in the piping. It just won't be as much disturbance as before.

Yea.

I dont think it will affect anything at all. By the time they reconvene, the exhaust is moving plenty fast, fast enough to jus FLOW.

BTW - I run a DDP, re-routed. I ran it without the reroute for a couple months but didnt like the noise. I re-routed it myself. I didnt notice a difference in power.

 

[becauseican]

I have not had a chance to dyno test the rerouted ddp yet, but I dont think that there will be a big difference in power. By reintroducing the wastegate exhaust farther down the down pipe and at a 45 degree angle is definatly more benifical than even a wide mouth style downpipe. Its the turbulance immediatly behind the turbine outlet that you want to avoid.

 

[prsrcokr]

I have not had a chance to dyno test the rerouted ddp yet, but I dont think that there will be a big difference in power. By reintroducing the wastegate exhaust farther down the down pipe and at a 45 degree angle is definatly more benifical than even a wide mouth style downpipe. Its the turbulance immediatly behind the turbine outlet that you want to avoid.

Thanks Randy, that's what I was hoping to hear. The 45 deg. entry is the preferred reroute to maximize smooth flow merging, at least according to my readings.
Brian