Originally Posted by Jokestrap

That's right... All have to remember that the rev-up has different cams than the 287. The cam phasing takes away some of this low end tq that you describe, though I will say that it still does start off slow and finish big...

Originally Posted by Z350Lover

I have got an 05 lower intake plenum from Jason too.... and my peak power has already shifted from 6500rpm or so to 7200-7300rpm and if my injectors were not maxed out, it would be kept at the peak all the way to 8000rpm on my car...

So with those shorter runners on the 05 lower intake plenum, you will definitely lose some low end torque and gain high end power... lucky me that I got those lower end torque back from running higher compression pistons and lighter rods..

cheers,

richie

Originally Posted by Jason@Performance

This is a very arguable subject...

It comes down to the driver, the cars configuration etc etc...

When I had this set up on my car, unfortunatly I was not able to get my reflash done to run higher RPM like I was planning to... I had the parts to build my motor up to 7800-8000 RPM and make power up to...

With a motor that makes more power the shift points change to where you need to accelerate up to a certain point and then when you shift have the RPM fall into the optimal point in the power band to being accelerating into that next gear...

This is where we can look at the "M-REV" mod dyno's in reverse...

Below is a dyno of the M-REV dyno we did on a Rev UP motor...

M-REV mod is basicly 287 Lower Plenum on the 300HP rev up motor (Track Model Lower Plenum)...

We know the RevUP plenum makes for more power in the Higher RPM's
We know the M-REV mod changes powerband to make not as much power up top which is where the "Spacer" comes into play (Spacer can be in form of the Motordyne spacer, Crawford Plenum, Skunk2 spacer etc... all essentiaally do the same thing)...

So this is where it gets tricky...

We will use the 7000 RPM redline for example...

7000 RPM in 2nd gear with 3.53FD is 67MPH
4900 RPM in 3rd gear with 3.53FD is 67MPH

Assume that in the time you shift from 2nd to 3rd enertia is still acclerating the car you would fall into gear around 5200 RPM (ish)

Highlighted in Green is the REV-UP plenum modification:
Highlighted in Red is the 287 plenum modification:

Each block is exactly the same size representing the optimal shift points with said modifiaction:

Lets explore the REV-UP shift points...

Starting at 5200 RPM HP rating is just about 225RWHP. It accelerates to peak 266RWHP at 6200RPM and FLATLINES (making constant 266RWHP) until cut off at 7000 RPM. So it takes 1000RPM to get to Peak HP and maintain it. This same HP curve is seen on 287 Motors with JWT cams for example and a higher Rev Limiter. But shift points can be made even higher with the higher revlimiter to benifit the more constant peak HP... That is 750RPM spent in PEAK HP range while accelerating!


Lets explore 287 plenum shift points...

Starting at 4700 RPM HP rating is just about 225RWHP. It accelerates to peak 268RWHP at 6100 RPM and then Dies Off. So it takes 1400RPM to get to Peak HP but it then dies off. Only 400RPM spent making around Peak HP.




In short... The power seen from the 287 plenum is best for the Daily Driver who doesnt spend as much time in rapid acceleration... Yes the car feels more Torque in lower RPM with the 287 plenum but its the HP that pushes you through the corner and takes over in the higher RPM's, once the intial Moment of Enertia is in effect, the HP takes over...

You can look in the Dyno that the TQ is More while the HP is More at the higher RPM's as well...


If you run a HIGHER Rev Limiter with the Rev-Up plenum on a Rev-Up motor you can run to 7500RPM on stock internals safely and make power... You will beable to change your shift points up to 7500RPM and spend even more time making Peak HP while accelerating...

Originally Posted by VQ35deMax

that is very interesting. accoring to the graph then nissan lied about the z having 300 hp then. but how a revup be with a spacer then? would it provide even more gains in the higher rpm range?

Originally Posted by jcarp

thanks man yeah they say i got 300 hp and 260 ftlbs. i dont stay below 2500 anyways so it should do pretty good i'll let ya'll know when they come in and i put them on. gonna go fi shortly.

Originally Posted by jcarp

i talked to motor dyne and they said that it was different than the one on the car. its runners are longer to give it more torque that the motor is lacking and the are ported a little. i have the rev up motor and this intake is made for my car just a different version of factory for the new car. this is what i was told and if its the same peice i got i would be a little ticked.