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
