05 Lower Plenum Installed and Dynoed!

[jason@performan]

05 LOWER INTAKE PLENUM!

It is FINALLY In my hands! Goin on my car tomorrow!

It is Beautiful let me tell ya. The excitement I felt ripping open the box. I didnt even stop to pop any of the bubble wrap I was so excited!

And what do I see? Much larger volume of air in the lower intake manifold which means...

What the new Upper Plenums was doing, Nissan did it but to have even more volume in the intake plenum using the factory 05 Rev-UP Engine Lower Intake Plenum!

This will fit on 350Z Coupe / Roadster / G35 Sedan / COupe / FX35... With no modifications... Using the same bolts and gaskets... (I recomend replacing the lower and upper intake plenum gaskets with this...)

Enough babbling... here are the pix!


















So it was installed first thing this morning...




Innitial reaction = Gained up top where I figured it would. Felt some low end torque get taken away... Above 6000 RPM it really pushed me back into the seat...

I guessed it was about an 8RWHP Gain with little torque loss...

Drove down to the same dyno place... Same tank of gas... Drove the car the same 35 miles to the place at about the same speed / rpm...

Put it on the dyno and what did come of it?



The best pull from Yesturday (our baseline) was:

256.3RWHP / 238.2TQ


The best pull from today was:

263.6RWHP / 227.1TQ


BUT. The most important part was where the motor is now making its horse power...

Before the Peak HP was @ 6250 RPM. The Peak horse power is now moved up to 6700 RPM where my fuel cut off is. My next step is to raise up my rev limiter and tune it... I am running about half a point leaner with this new plenum install...

Keep in mind I have my stock cats on and DC SPort Headers. I took a big step back in TORQUE from installing those headers and putting my stock cats back on...

If I were to re-install my test pipes / high flow cats... I would more then re-gain the lost torque from this isntall plus gain more HP...



About half a year ago HFM put together a dyno day and tested his car before and after a crawford plenum. He was only able to get about 3-4 RWHP out of it. I dont remember what torque did...

But this gave a solid gain of 7.3RWHP without tuning ON a MODIFIED car...

Need to tune then do another dyno now

[Zivman]

Originally Posted by jason@performan

05 LOWER INTAKE PLENUM!

It is FINALLY In my hands! Goin on my car tomorrow!

It is Beautiful let me tell ya. The excitement I felt ripping open the box. I didnt even stop to pop any of the bubble wrap I was so excited!

And what do I see? Much larger volume of air in the lower intake manifold which means...

What the new Upper Plenums was doing, Nissan did it but to have even more volume in the intake plenum using the factory 05 Rev-UP Engine Lower Intake Plenum!

This will fit on 350Z Coupe / Roadster / G35 Sedan / COupe / FX35... With no modifications... Using the same bolts and gaskets... (I recomend replacing the lower and upper intake plenum gaskets with this...)

those numbers look good. What are your thoughts on pairing this with the crawford plenum?

Also, what's the expected ETA on the preorders?

[jason@performan]

should be about 2 weeks max at this point...

[Zivman]

Originally Posted by jason@performan

should be about 2 weeks max at this point...

Any thoughts on pairing this with the a replacement upper plenum - crawford or kinetix?

[DonaldxR]

Geez Ziv, u didn't have to quote Jason's post with all the pics. HAHA.


Geez, it's only $222?! That's pretty cheap. That's next on my list. Do u think this would be compatible with the Motordyne spacer?

[Zivman]

Originally Posted by DonaldxR

Geez Ziv, u didn't have to quote Jason's post with all the pics. HAHA.


Geez, it's only $222?! That's pretty cheap. That's next on my list. Do u think this would be compatible with the Motordyne spacer?

fixed

[jason@performan]

It will work with any upper plenum as long as it works with the stock lower plenum...

With the way some of the spacers are they raise the front more then the rear... same with the plenums... this will Fix what the plenums fix... so fixing it twice will actually make the front even more higher then the rear...

It may throw off the performance of this product...


My whole issue with the aftermarket plenums was making the front of the plenum have too much free space for are to become turbulant and loose direction... This does NOT make a huge amount of space on top of the runner so the air actually can move in a more defined path making for more of a power gain...

So here is what Im thinking...

If you want an engine with a Higher REDLINE to make more power up top then go with this lower intake plenum... That means those of youwith Reflashes with Higher RPM limiters...

For those who do not want to re-flash their ecu for a higher redline this product will make power... but half of the power that this can make will be useless since the power that will be made is at and above 6250RPM...

[gq350z]

This is very interesting. Do you have an aftermarket upper plenum? The price on this thing is so damn attractive, I don't think I can resist. I hope someone purchases soon and shows the dyno with like say the new cast Crawford plenum.

Regarding the use of this in conjunction with an aftermarket upper:

Isn't more air better? I would assume to a certain degree that both of these pieces will generate even more hp?

Thanks.

[Ralphus]

Will this help with the reported 5&6 cylinder lean condition in an FI application? I can't tell from the pics, but it seems they will still get more incoming air...

[jason@performan]

Originally Posted by gq350z

This is very interesting. Do you have an aftermarket upper plenum? The price on this thing is so damn attractive, I don't think I can resist. I hope someone purchases soon and shows the dyno with like say the new cast Crawford plenum.

Regarding the use of this in conjunction with an aftermarket upper:

Isn't more air better? I would assume to a certain degree that both of these pieces will generate even more hp?

Thanks.

No Aftermarket Plenum...

Mods at time of Baseline:

JWT Pop Charger
UR Crank PUlley
TILTON Full STreet
DC SPorts Ceramic Headers
STOCK CATS
NISMO Exhaust

256.3RWHP / 238.2TQ


Mods at time of Lower Plenum install (24 hours apart)

JWT Pop Charger
UR Crank PUlley
TILTON Full Street
DC SPorts Ceramic Headers
STOCK CATS
NISMO Exhaust
05 TRACK LOWER INTAKE PLENUM

263.6RWHP / 227.1

[jason@performan]

Originally Posted by Ralphus

Will this help with the reported 5&6 cylinder lean condition in an FI application? I can't tell from the pics, but it seems they will still get more incoming air...

This will help get more air to the front of the cylinders in the same way that aftermarket plenums do...

But this will also change where the peak HP is made...

My Peak HP used to be at 6250... Now it is at 6700

[Zivman]

Originally Posted by jason@performan

It will work with any upper plenum as long as it works with the stock lower plenum...

With the way some of the spacers are they raise the front more then the rear... same with the plenums... this will Fix what the plenums fix... so fixing it twice will actually make the front even more higher then the rear...

It may throw off the performance of this product...


My whole issue with the aftermarket plenums was making the front of the plenum have too much free space for are to become turbulant and loose direction... This does NOT make a huge amount of space on top of the runner so the air actually can move in a more defined path making for more of a power gain...

So here is what Im thinking...

If you want an engine with a Higher REDLINE to make more power up top then go with this lower intake plenum... That means those of youwith Reflashes with Higher RPM limiters...

For those who do not want to re-flash their ecu for a higher redline this product will make power... but half of the power that this can make will be useless since the power that will be made is at and above 6250RPM...

do the side chambers taper downword with the slope of the stock plenum upper plenum (get deaper as they move towards the front)? Can you measure how tall the runners are vs the original plenum? If the runners on the orignal plenum are limiting flow with a replacement plenum in place, which I would think they are, then this would be a beneficial match. Though, I know that too much flow isn't a good thing.

[Bird_Dog0347]

looks to me like the small loss of both power and torque through the entire RPM range only to gain a small amout of peak HP on the top end would not make this the best plenum for the average street Z. Unless I have recently gone colorblind and seem to be reading that graph wrong, that plenum LOSES HP AND TQ all the way through the band untill the last 750 RPM. Am I reading that wrong?

[Zivman]

This new lower plenum looks like it opens up the runners to all the cylinders, not just the front, so you still might be limited by the upper plenum.

[jason@performan]

Originally Posted by Zivman

do the side chambers taper downword with the slope of the stock plenum upper plenum (get deaper as they move towards the front)? Can you measure how tall the runners are vs the original plenum? If the runners on the orignal plenum are limiting flow with a replacement plenum in place, which I would think they are, then this would be a beneficial match. Though, I know that too much flow isn't a good thing.

The runners on the Non-REV-UP motor are longer... There for making more TQ but less HP up top...

The runners on the REV-UP motor are shorter... There for making less TQ but more HP Power at higher RPM's...

There is a more direct path into the lower intake manifold below the Lower Plenum... The height of the opening of the runners is taller by about 1/2 an inch...

The air flow is more direct... FOr a high RPM motor this is a beautiful mod... Especially for drag racing / road racing.. the free way driver will not expereince the same pull at lower rpms (3000-4750RPM) as they did before with this plenum since the HP and TORQUE curve is moved to the HIgher RPMs...

[Zivman]

Originally Posted by Bird_Dog0347

looks to me like the small loss of both power and torque through the entire RPM range only to gain a small amout of peak HP on the top end would not make this the best plenum for the average street Z. Unless I have recently gone colorblind and seem to be reading that graph wrong, that plenum LOSES HP AND TQ all the way through the band untill the last 750 RPM. Am I reading that wrong?

That's true; as Jason stated:

"This will help get more air to the front of the cylinders in the same way that aftermarket plenums do...

But this will also change where the peak HP is made...

My Peak HP used to be at 6250... Now it is at 6700"

it just seems that the replacement plenums might be better at getting more air to the fron than this revised lower plenum. This makes me think that they might be a good match for each other

[DonaldxR]

Originally Posted by Bird_Dog0347

looks to me like the small loss of both power and torque through the entire RPM range only to gain a small amout of peak HP on the top end would not make this the best plenum for the average street Z. Unless I have recently gone colorblind and seem to be reading that graph wrong, that plenum LOSES HP AND TQ all the way through the band untill the last 750 RPM. Am I reading that wrong?

I think ur right about the HP but for the torque, it seems like the opposite. Lower peak torque, but good torque gains through out the powerband.

[jason@performan]

Originally Posted by Zivman

This new lower plenum looks like it opens up the runners to all the cylinders, not just the front, so you still might be limited by the upper plenum.

Not necessarly...

Do you put a 4" exhaust on a 2.5L NA motor? You end up loosing power with an exhaust that has too little back pressure...

If you have too much volume ABOVE the runners in the plenum there is free space for the air to loose direction and velocity... So if you have a taller plenum above the lower plenum, the runners are sucking air from a larger area...

Take a straw, put it inside of a large plastic bag... It is harder to suck the air out of the larger plastic bag and takes more work then out of a smaller bag where the straw has a more direct path to the air inside the bag...

It works the same way inside of the plenum...

There might be some gain... maybe a horse power or two... I dont see it making a signifigant gain to what this part has added...

Oh by the way... Did I say that this thing adds a really cool deep roar to the engine bay too

[Zivman]

Originally Posted by jason@performan

The runners on the Non-REV-UP motor are longer... There for making more TQ but less HP up top...

The runners on the REV-UP motor are shorter... There for making less TQ but more HP Power at higher RPM's...

There is a more direct path into the lower intake manifold below the Lower Plenum... The height of the opening of the runners is taller by about 1/2 an inch...

The air flow is more direct... FOr a high RPM motor this is a beautiful mod... Especially for drag racing / road racing.. the free way driver will not expereince the same pull at lower rpms (3000-4750RPM) as they did before with this plenum since the HP and TORQUE curve is moved to the HIgher RPMs...

you'd think that the increased, direct, flow would be benefited by full exhaust - headers, TPs, and catback - matching intake flow with exhaust flow. You stated you had stock cats on. I bet you would have seen more power with the testpipes; obviously having done the baseline with test pipes.

With forced induction, this would have to be a great power adder with the crawford upper plenum.

[jason@performan]

Originally Posted by Bird_Dog0347

looks to me like the small loss of both power and torque through the entire RPM range only to gain a small amout of peak HP on the top end would not make this the best plenum for the average street Z. Unless I have recently gone colorblind and seem to be reading that graph wrong, that plenum LOSES HP AND TQ all the way through the band untill the last 750 RPM. Am I reading that wrong?

You read correctly...

I am going to technosquare my car (finally) to get a higher RPM out of the motor and fix my AF which is a little lean... I think that will make up for some of the lost HP and TQ...

This mod as I stated above is best for a HIGH RPM Motor...