i see alot of Built/high power TT Z's w/o using plenums.... do plenums not give u a good bang for buck as they do for N/A?

 

I use the APS Tallboy Plenum with 2005 Rev-up engine intake runners on my setup.

 

i am torn between which one to get or make one myself.

 

I think part of the problem is that they have not sorted out the fuel system for high HP yet. You don't need a plenum to reach the limit of the current fuel systems. Therefore that plenum would make no use. Unless you were able to make more power running less boost. For ex.

If your fuel system is good for 12psi max. Then i guess the following would happen and maybe it would make sense to get a plenum after engine build-up.

12psi + 9:1CR = 600rwhp These numbers are hypothetically speaking
12psi + 9:1CR + Plenum = 640rwhp

12psi + 9:1CR + Plenum = 640rwhp - 350z MT = Headache (j/k)

In that case your right.

 

because it's all bull$hit

 

i heard there is a really well engineered full plenum (not just upper half) coming out soon. i hear that THIS one not ONLY blings, but it also blangs. Wonder when more of this thing will be seen.. hmmm.

 

Charles, whats that picture of in your avatar?

 

I am guessing that it is a factory lower plenum modified with airhorns to be used with a new upper "box" plenum. Very trick....and I am sure will be available very soon.

I am just gathering from the above post

[QUOTE]i heard there is a really well engineered full plenum (not just upper half) coming out soon. i hear that THIS one not ONLY blings, but it also blangs. Wonder when more of this thing will be seen.. hmmm.[QUOTE]

 

I got 23 WHP just by adding the APS plenum to my set up, no tunning, nothing..Built motor APS TT kit..

 

 

that is really good hp from just an upper plenum! i dont doubt your gains at all, but are you sure some of it didnt come from leaning out a little? your HP already exceeds the stock MAF, and the unichip MAP sensor will not see the additional airflow of the greater volumetric efficiency created with the APS plenum. This means that if the APS plenum was doing anything to make power (which im sure it is), it would also lean out the engine a little bit... in effect making even more power if the car was tuned conservatively rich... in other words, changing the intake manifold on a car that runs a MAP sensor IS TUNING in itself, because it will cause a change in the A/F.

I think that a major benefit to a plenum such as the APS, is not only that it makes a little power (or a lot for your dollar)... but its greater volume should really even out the airflow distribution into your engine. I dont think there is an airflow problem with the stock setup at lower power levels, but you will see inadequacies of an intake manifold appear as you up the HP... and I think that with the 400-450hp+ thing, the stocker should probably GTFO.

In a couple weeks when I am setup in my new place and everything, I will show you guys the intake manifold we have here. Its intended more for guys looking to make huge power... such as 600-1000 in FI. The plenum upgrades such as the APS are awesome and really stretch your dollar... but I want to show you guys how much there is to gain with a full replacement "tuned", if you will, intake manifold. We also have a customers 292rwhp NA car on standby for dyno testing of this manifold, just for a little research.

 

I wil scan my Dyno's and post later. We realized a gain all throughout the power band and a slight leaning of A/F but only .02 of a difference..Ill show and tell later, I left my Dyno at the shop.

 

good stuff! i wouldnt mean seeing that dyno graph just for the hell of it... but i definatly believe you anyway. its a nice product they have there.

 

Actually here is my Before and after A/F.I am really running pretty rich and need to retune, however I was left the headroom for when I upgrade the actuators.Keep in mind Im oly producing 10 psi of boost on a lower compression motor.Ill get the HP Dyno later from my shop.

 

thanks for the graph. as I expected, the car is running quite a bit leaner and i bet a bit of your HP came from there. HOWEVER that is not a bad thing... because after all it does prove that the APS plenum has greatly increased your airflow... this means its working well at its job, making HP, and leveling out the airflow for greater HP potential.

 

Yea the aps plenum is badd ***... I had 445 rwhp and added the plenum same tune I went up to 470rwhp.....it's a really good plenum ment for turbos...

 

One thing it does prove is that the product does perform as described and it leans the A/F Throughout the RPM range as the graph indicated.It MUST be flowing more air, like you said..It definitely works the was it is engineered to work.

 

Ah...now I know who you are...sneaky little devil.


I am running the Crawford cast. Most of the built motor cars I have seen, tuned, or read about.....all had upgraded plenums.

 

By adding the Crawford Plenum I ended up gaining 20 horses on my APS TT...not build motor but nonetheless FI...it does work

 

I want the most power possible with as little boost as possible, that's why I had my heads ported and polished and added the plenum, and is why I'm upgrading to a bigger exhaust asap.