Porting The Stock Manifold ?

[Phoon508]

Piks or it didn't happen

[Kroozin]

Haha yeh!

Removed a fair bit so far, thinking of knife edging that webbing there too.

Sanded back everywhere I could get my lanky fingers at as well. Could not believe how rough they are from factory fmd it's bad.

Pretty happy with how it went, now everything is smooth as

The exh. comp. housing is the same just didn't get a pic of it b4 dropping it back to joes.

Here's a couple of pics of the exh. Ports (not my handy wk)

[Kroozin]

[matsfgxr6turbo]

Looks good mate put it on a dyno so we can see the gains

[ms700]

still waiting on mother in law piks

[Kroozin]

  On 24/02/2014 at 8:54 AM, matsfgxr6turbo said:

Looks good mate put it on a dyno so we can see the gains

Unfortunately it's going to be a little while still b4 I can really test it all out.

I'm still running a opt. 3 clutch so I think either that'll let slip or I'm going to need some stupidly sh*thouse tyres.

[Kroozin]

[Kroozin]

Before and after.

[Ralph Wiggum]

It will be interesting to see how the thin edge on the divider copes with the heat in the manifold.

[juggernaut]

The divider will probably crack - I've seen them crack in sr20 manifolds without being modified.

I've also see part of the divider in a Garret twin scroll T3 .78 exhaust housing crack and come away.

The points of the greatest restriction (collector on manifold and ex housing) cause the greatest heat and therefore most prone to failure or cracking.

Out of interest I had 6 boost sr20 manifold extrude honed and flow bench tested. The flow gains were nominal. Stock manifold could be a different story though.

I also had the same place do the s15 sr20 intake manifold and the flow gains were quite substantial and each runner was flow matched. In the end I put on a Hypertune intake manifold which has cracked twice on me. Should have fitted the flowed stock intake.