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

prsrcokr

Motörhead
Apr 3, 2005
349
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Richmond
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
 

prsrcokr

Motörhead
Apr 3, 2005
349
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104
Richmond
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

Supramania Contributor
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

Picture Me Rollin
Apr 4, 2005
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Corpus Christi, TX
JustAnotherVictim said:
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

Supramania Contributor
Mar 31, 2005
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Vancouver
www.bicperformance.com
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

Motörhead
Apr 3, 2005
349
0
0
104
Richmond
becauseican said:
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