Building another motor with secondary bridge, here are the exhaust ports. These ports are considered a stage II here in Japan. The stage III ports go up to 112mm and down 67mm.

chuck

 

another pic

 

last one

 

Nicely done Sleeper7!!

 

what are the pro's and con's of the stage 2 comapred to 3?



well im pretty aware of the pros..... so i guess the cons

 

Ported stock SS exhaust sleeve?

Aftermarket exhaust sleeve?



I don't like to run more overlap, and those ports increase overlap significantly.





-Ted

 

Exactly, I seen lots of folks sayin how we here in the US do small exhast. I would think the consensus is becuse we like our low end power. But, I have never seen a dyno on a port that big. Just stating an educated guess on that big of an exhast port.

 

I've got pixs of a "stage 3" as you would call it somewhere and all I can say is



Thanks for the pictures also!

 

very nice looking, and where in japan is yokota?

 

Yokota is 2-3 hour from Tokyo.



Ted, stock turboII sleeves.



The con of big ports is no low end power, from what they say. I think the gain at the top end makes up for it though. My current "stage 1" exhaust port is almost ready to go back to the dyno, about 75-80% tuned now. Looking at 2 weeks to get some more numbers. Every time I turn around here I see huge exhaust ports from the local tuning shops. This is why I am going to give it a try. Stepping out of the box as they may say.

chuck