Sh0velMan's Track Car Build

Megan370z

Knowing you got the FI Exhaust and PPE header, your next step from what I have seen is the intake side.

I dont know what is the diameter of those Nismo Intake but you might want to look into a bigger TB and intake tubbing if they are too small.

If you remember, I mentionned all of this in my thread and at both occasion where I tested back to back , there was gain of 7-9whp with a bigger TB & CAI & Maf Tube.

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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.

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synolimit

Any knock? The AFR was rising till that dip point then it fell along with the power and TQ

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13 370z-

Sh0velMan

I wasn't looking @ knock counts, but timing wasn't pulled, so I can pretty safely assume that there wasn't excessive knock.

There's a dynamic around that area that I don't understand, and I honestly don't know if any of the tuners really understand it either, because I'm pretty sure it all revolves around VVEL.

I didn't log VVEL position (You always think of these things afterwards, not while you're sitting in the car sweating) so I can't try and correlate any of it to that.

Maybe a pro tuner can help me figure it out... It may be as simple as a plumbing issue though. Definitely looks like there is a specific flow limit it reaches and from there on, it's down hill. It happens later in the rev range on the old exhaust/tune than it does now, but it's the same limit.

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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.

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Sh0velMan

Groovy.

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

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Megan370z

don't lose your time with the OEM MAP sensor on the 370z.

it will be better with an actual gauge that can read vacuum properly.

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Megan Journal *Click Me* ....................One Man Team Motorsport *Click Me*