Sh0velMan's Track Car Build

Originally Posted by Sh0velMan

Well, the Nismo intakes are 2.75" ID, I somehow doubt that those or the TB's are an actual restrictor, but I suppose it's possible...

The "cut" so to speak, is between 6200 and 6400 RPM. This corresponds with the point at which the MAF flow #'s clip. Basically it hits like 266 G/Sec and stops. (I think it's 266, it's been too long since I looked at it, I need to start logging that stat now I guess)

Problem is, I don't know how that reading possibly affects anything when the MAF Volts continue to climb/index on the table.

I may need to send some data to a pro tuner and see what they think might be happening... if the lump at the end there extended from 6100RPM and then rolled off closer to redline, I think we would see much more impressive top end numbers. It seems aborted, the way it is right now.

Originally Posted by Megan370z

I have seen vacuum building up in the top end, this is why I ended going with an oversized TB which proven gain. Twice

the 266G/sec is the max number on the Uprev table. the way it was explained to me in the beginning was that as long as you can give fuel with the MAF Table the G/sec is kind of useless

this is a copy/paste of one of my concern on this topic with Jared @ Uprev

I don't think I've ever seen the g/sec go down while the V was rising, but I honestly don't usually look at the g/sec since that parameter becomes totally meaningless once you change the K fuel multiplier for a different MAF or injectors.

Originally Posted by Sh0velMan

Groovy.

Yeah I need to start logging manifold pressure, sounds like.