Agent_D

iTrader: (2)

Well I remember there being threads on this but my searches turned up none of the info I wanted.

Right now I have an S5 motor in my car with S5 intake.

What my question is, is there anyone who has a dyno sheet of a before and after of a S4 n/a intake to S5 n/a intake swap? I honestly feel having used both, that the S4 intake is actually better. I also think I would pick up some low end and mid range power since my S5 manifold has the VDI wired open.

Opinions, facts, and dyno sheets welcome

Shainiac

iTrader: (7)

If the VDI isnt working properly, the S4 would definately feel beefier in the mid range. The only problem is, if you're running the S5 ECU, the S4 manifold runs out of breath by the time you get to the 8000rpm redline.

Agent_D

iTrader: (2)

This is how the car pulls with the current setup.

1st through 3rd run at 6500 feet elevation and going slightly uphill.

Yes its dirty, it's been sitting for about 6 months and I'm getting things done before it gets cleaned ;p

Edit: guess I should post the link to the video. http://www.youtube.com/watch?v=qFzKg5PLW_I

rotarygod

iTrader: (1)

Red line is S4 manifold. Blue line is S5 manifold. Not my car but he is a forum member. I have an S5 manifold on my GSL-SE and it used to have an S4. Hopefully that says something.

http://www.globalvicinity.com/images....9577_2807.jpg

Shainiac

iTrader: (7)

^ That's with the VDI and 6PI functioning properly, correct?

If the OP is referring to the 86 Base in his sig, he would have take the proper measures to get the VDI working properly. With the VDI wired open, my S4 manifold felt stronger everywhere except up high. I ended up putting my S4 manifold back on simply because it was more pleasant to drive on the street and I didnt have the internal modifications or ECU to really take advantage of the shifted power curve.
Imho, the S4 manifold is more useful than a non-functional S5 manifold.

rotarygod

iTrader: (1)

I agree with that last sentence. The whole point of an S5 manifold is to extend your powerband without losing anything. If you wire the VDI open full time, you effectively are using shorter runners from a tuning standpoint so you'll be down on power below about 5K or so. This would definitely feel more sluggish on the street. Keeping the aux ports open full time too would only serve to make this worse. Everything needs to be kept hooked up to get the most out of it. VDI isn't that hard to make work.

Agent_D

iTrader: (2)

Yea, the 5/6 port system is removed on my car, and the VDI wired open. I have no problem with driving on the street even at low rpm's, I cruise the 45mph zones in 5th gear at 1500rpm and can accelerate from there. I may look into finding a way to make the VDI functional with a small air pump or something with an RPM switch.

Oh, also my S5 intake is ported quite largely on the outter runners where it mates up at the upper/lower section and the dynamic chamber area was ported some as well.

Thanks for the dyno sheet RG

Agent_D

iTrader: (2)

I just found the writeup on electrical 5/6 port actuation on Kevin's page. I'll just do that for the VDI and see how it goes.

The only thing that worries me is how long one of those electric 12v air compressor motors will last on a track where its always on for extended periods of time, or if it would overheat.

rotarygod

iTrader: (1)

If you have any electronics skill and want a little project, try this:

http://howto.globalvicinity.com/gv_w...i=46&co=1&vi=1

Agent_D

iTrader: (2)

Wow looks fun, I might give it a try.

tony13pr

Does this really work?

fidelity101

iTrader: (11)

if there is an S5 NA run on an S4 electronics would you keep with the existing s4 redline or s5 redline?

drewski86

Depends on what RPM power peaks.

fidelity101

iTrader: (11)

What?