Jump to content
SAU Community

Recommended Posts

Recently we have checked a few stock turbo's as well as one after market turbo and noticed the flange of the turbo is smaller than the flange of the

exhaust manifold both stock and bling staino ones. So the gases rushing out fo the engine through the manifold hit a big edge of the turbo flange. Not good. Might we worth checking and grinding out and match porting if you are changing turbo's or having it off for any work.

See the pics as we found 2 to 3 mm gap. We found this by simply doing a test not suspecting anything and actually suprised to see how bad the overlap was. We found this problem by carefully tracing out the turbo flange and cutting out of card board and laid it over the exhaust manifold and it became very obvious. With this edge jutting out if would make a difference to flow as would create a lot of turbulence especially at high revs.

To fix this all you need to do is remove the turbo exhaust housing and mark out and match port to suit. FREE POWER.

Will check GTR turbo's asap.

Link to comment
https://www.sau.com.au/forums/topic/81792-turbo-flange-over-lap/
Share on other sites

I should ask James from Abrasive Flow as he match ports to head and turbo and extrude hones the GTR exhaust manifolds and mathces to turbo. I know he opens up the exhaust manifolds a bit going into the turbo.

It is Pete. The manifold has a lip that turns the flow and finishes in a sharp edge. Not a good situation for flow but they maust have had some reason. Anyway it's probably just for stock boost, and would be an impediment at greater boost levels/exhaust velocities.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Purchased a NC MX5 a while ago Basic suspension mods done, BC coils and Whiteline sway bars  New DBA calipers, discs and pads Added some 17 x 8 Konig Decagrams with PS5's Added some typical NA bolt on's, i.e. full exhaust and intake  Added 0.5ltrs with a MZR2.5 swap, nice bump in torques  Found a detachable hard top which is locked in for a colour match with my local paint shop in Feb 25 The little thing is awesome, I drive it everywhere, it handles like a dream whether I'm up it or just cruising  But now,  because I'm a idiot, I keep looking at turbo kits....... did I mention I'm a idiot Why is dose so appealing 
    • I would not be surprised if you are the only person on earth that has the interest/desire to do that lol.  The Haltech base map is a really good starting point, the car will fire easily and drive very well, even on mild boost levels. To me, following your advice sounds like some sort of ancient Chinese water torcher lol (this is not an insult Josh, never change <3)
    • Those car show concepts from the 2000's and 2010's like the Floria and IDx were brilliant and should've gone ahead, at least one of them. But neither Honda nor Nissan are thinking about affordable performance any more, which is truly sad.  Even if Toyota's liquid hydrogen ICE development reaches the point where it's commercially viable and the infrastructure to support it, Honda/Nissan would have to wait until Toyota allow fee access to their patents to offer it with any smaller performance models they released to take advantage of it.  
    • A sporty manual RWD coupe with a IL4 Honda engine would only be a good thing I assume we won't see anything released for a few years though, unless informal talks and designs have been going on for a few years,  and due to the current, and future, emmisions and safety requirements, I assume anything "sporty" they would do would be at least some hybrid thingie And hopefully anything they are thinking of has nice lines, without lots of plastic and fake bits hanging off it like that horrendous FK8 that looked like it was designed by a 13 year old The other issue of course in the current market is cost, currently the type R is around $70k, a twin is around $50k Meh, I'm old and grumpy and would rather buy a older model car and waste my coin on that than buying anything currently available new  
    • Nissan needs to forget about building SUVs in every size possible and bring back the damn Silvia/200sx duo to compete with the 86/brz. Maybe with the Honda type r motor pointing the right way
×
×
  • Create New...