I went to RT Tuning with the following mods.

TD exhaust
AAM test pipes
K&N filter
**Kinetix Velocity Manifold**

Vince had a car with the same mods, different brand (aside from the MD spacer,) in his logs and he compared my dyno with his. Both Z's were 04 5AT.

Here's the dyno results. Kinetix Z is in red:


As you can see the spacer DOES make more peak horsepower but that top end greatly benefits from the Kinetix. It helps the DE motor not fall flat on its face after 6000 RPMs. The kinetix actually makes more torque up until 4200 RPMs as well.

For my purposes, I like the Kinetix powerband better and think the Kinetix car will beat the spacer car through the 1320.

 

So the dyno runs were not done on the same day?

 

No but all variables aside it is a fact that with a spacer the power still falls rapidly after 6200 RPM, not so with the kinetix.

 

Wouldn't combine plenum spacer with mrev be very similar and less cost?

 

Power still falls with MREV2.

https://my350z.com/forum/intake-exha...5-touring.html

 

Lol, so it's not a controlled experiment. You're comparing 2 different cars dynoed on 2 different days so your interpretation of results may not be valid. Plus, you're only looking at what you want to see and then claiming it as fact while throwing everything else out. It is still interesting to see the power curve comparison, though.

 

This is more about the curve than peak power wars.

 

I realize the main point of this thread is about the shape of the curve, but you did mention power/torque differences in your first post.

Also, did your tuner make any speculations as to why those mods give those curve shapes?

 

its still cool what you did , I wish there were more this vs that dynos around. Im assuming these graphs are from after the cars were tuned?

 

We determined the Kinetix Manifold does a better job of keeping the power up past redline.

Both cars were after tuning.

 

I really wonder how it would do with the 75mm throttle body. I believe the curved neck of the OEM manifold is what kills power over 6k , and the bend in the Kenitic manifold is a better flowing design. I wish i can the cash flow to do a lot of testing.

 

I second the above opinion. If the redline was 7500 or higher you give up 10hp from 5000-6300 but gain 20-30 from 6300 to redline

 

Another thing I wanted to note. The engine bay is noticeably cooler with the Kinetix Manifold.

MREV2 and 5/16th spacer per MD's site is 720... Only a little less than the Velocity Manifold.

 

How does the kinetix v+ plenum compare to these?

 

the md would be faster, shifting right over 6k. you have an overall higher power output.

 

Should be similar , maybe a little less fall off after 6k but really close to stock with spacer.

I was going to swap my V+ for a spacer and Motordyne told me to save my money.

 

How would the MD car be faster, even with stock redline? He has to shift before me, and if his redline is raised he's going to make less horsepower than me past the stock redline.

 

thats the deal...neither of you should be shifting at redline. neither of you are making power at redline.

the md's best shift point would be 6,200rpm

yours would be 6,400rpm.

the md makes more overall power in power band.

i can go on, but just line up against it and see for you self.

 

Please go on I want to see how deep this well of knowledge goes.

 

So..... you're suggesting that people should upshift just as they pass their peak hp..?