Is there enough info out there to take a stab (guess) at any potential gains that could be seen in the 1/4 mile with and extrude honed stock US intake manifold versus just the stock US Manifold ? Is asking a .1 off 1/4 mile times dreaming or about right for this mod ?

Im planning on having my throttle body ported and the IM extrude honed, since i dont know much about any of this in regards to performance, really have another question.

I guess its called port matching. Should in take manifold be port matched to the throttle body or is this not neccessary ?

thanks c

 

There is a nice thread about MEVI, VI, and extrude honed IMs in the general forum. Here it is: http://forums.maxima.org/showthread.php?t=356359

As for porting the TB, you will see some gains from that. I can't say anything on extrude honed IMs b/c I don't know. But as for porting my upper and lower intake manifold runners, I didn't see ANYTHING from that in the 1/4 mile. I got a slight loss in low end and a slight gain in top end.

With my ported TB, I saw gains from that. I believe I shaved around .08 from porting my TB and matching the intake manifold. And of course you have to match the manifold to your newly ported TB or there will be a nice lip in the airflow. With any port work, you want to make sure the transistion between two components is as smooth as possible. Any lip or dip in the airflow can really hurt performance by causing swirls and turbulence.

http://www.littlebabywebs.com/maxima/tbpage.htm

http://www.littlebabywebs.com/maxima/intakeport.html

These links might help you. That is what I did to my car. The tbpage.htm has a nice write up on what you need to get and how to port your own TB.

But I recommend getting it bored or upgrading to a bigger TB, or both. www.maxbore.com seems to do good work. You might want to check them out. I am thinking about getting my stock TB bored since I'm sure I will see a little more airflow at the upper rpm range.

 

http://www.maxbore.com/

 

I guess you didn't read my post.