slipstream808
15+ Year Contributor
- 773
- 6
- Mar 2, 2005
-
State College,
Pennsylvania
Well as I see it, it's like this:
With the primary runners you get better velocity but there will be a point where you are making less power due to the lack of overall airflow.
The secondary runners give you more power up top but there will be a point where you make less power due to the smaller amount of air entering at a lower velocity.
Only thing you can do is take it to the dyno and see what happens. You have to adjust for when it opens through trial and error. It'll vary from setup to setup because of the different characteristics of spoolup on different turbos and at what RPM that occurs, cams... all that volumetric BS (not BS but you know what I mean). There might be a point where there is a drop off in airflow due to the disturbance. I dunno. It probably wouldn't be all that bad. Nothing worse than hitting V-TEC!!
IF you had an intrepid SOB, and they wanted too, they could put the manifold on their car (I'm guessing you'd need above a 50 trim to show the benefits of this experiment up top end RPM's as a 16g would fall off in power) and optimize the opening of the butterflies. Then take off the manifold and port it and see what happens to a dyno run. Then go back and adjust butterfly opening time as needed. Then take the manifold off, port it, and so on and so forth.
DSMLink guys have a good advantage IMO. They can adjust the opening with the nitrous controls. They include RPM AND throttle position. That's very important in a turbo car because you can be cruising along well into the turbo's spoolup RPM but being light on the throttle (50%) and not have spoolup so who needs the secondary runners to be open when there isn't enough airflow? Then mash the gas and they open quick and the turbo spools and you just take the hell off. Oh well... ideas, ideas. First I need one, though.
With the primary runners you get better velocity but there will be a point where you are making less power due to the lack of overall airflow.
The secondary runners give you more power up top but there will be a point where you make less power due to the smaller amount of air entering at a lower velocity.
Only thing you can do is take it to the dyno and see what happens. You have to adjust for when it opens through trial and error. It'll vary from setup to setup because of the different characteristics of spoolup on different turbos and at what RPM that occurs, cams... all that volumetric BS (not BS but you know what I mean). There might be a point where there is a drop off in airflow due to the disturbance. I dunno. It probably wouldn't be all that bad. Nothing worse than hitting V-TEC!!
IF you had an intrepid SOB, and they wanted too, they could put the manifold on their car (I'm guessing you'd need above a 50 trim to show the benefits of this experiment up top end RPM's as a 16g would fall off in power) and optimize the opening of the butterflies. Then take off the manifold and port it and see what happens to a dyno run. Then go back and adjust butterfly opening time as needed. Then take the manifold off, port it, and so on and so forth.
DSMLink guys have a good advantage IMO. They can adjust the opening with the nitrous controls. They include RPM AND throttle position. That's very important in a turbo car because you can be cruising along well into the turbo's spoolup RPM but being light on the throttle (50%) and not have spoolup so who needs the secondary runners to be open when there isn't enough airflow? Then mash the gas and they open quick and the turbo spools and you just take the hell off. Oh well... ideas, ideas. First I need one, though.
cant wait.
anything above 300whp on a fwd is somewhat useless wheel spin get really ugly
i have a comparison of the cyclone that i ported it works great with dsmlink. i have the secondaries opening at 4200rpm. boost was set at the same as before 23psi and let me tell you the cyclone was indeed better down low and about the same up top maybe a little better because i ported it! this dyno was done with no tuning and i registered 0 knock! we can finally put to rest it the cyclone is worth it or not
if you look at the dates you will see that it took almost a year to get a cyclone manifold, dsmlink to control it and finally to strap it down to the dyno. so IMO the cyclone if you can get it to work properly is not a bad upgrade
