I've got an 04' AT 350Z and wanting advice worth 2,000 bucks to give me some horsepower.... looking at intake, plenum spacer,.... and few other things.. no Nitrous. But i would like some input on hp gains with a low cost budget that will equip to an AT. Anything will be appreciated! thanks

 

I would go for an exhaust, anything other then that is waste for a NA car.
Go FI or go home.

 

Exhaust first, the gain is thru-out the whole rpm range, then plenum.

 

so... why exhaust first? would the plenum spacer and intake not be as efficient?

 

Intake doesnt do ****. Plenum, what you might get 1 hp.

 

Well for one thing you'll appreciate the sound a lot more.

 

please show me your dyno slip with 1hp from your plenum spacer. The plenum spacers have TIME and TIME again proven to be one of the best NA mods to produce HP. Very few exhausts will come close to the gains that a spacer will give for a faction of the cost.

I recommend the Motordyne 5/16 space

 

i would also like to see your results even on air intake... its got to do more than 1 hp gain... sounds to me like someone is anti-anything different from what they have under their hood

 

https://my350z.com/forum/showthread....ht=plenum+dyno

not worth it.

 

save up for FI. Best bang for the buck.

 

You obviously need to read that post again.

MRev2 and a plenum spacer are DIFFERENT!

 

what the hell... Hooked on phonics broseph

 

or you could always go to the sport Z Magazine plenum shootout and see the results.

 

I would do plenum spacer, strup header and 3.9 rear gear.. thats what i was going to do.

 

Plenum spacer, possibly the Mrev2, and some form of short ram intake. Also theres very few exhausts out there that show significant gains throughout the rpm range. Most of them if not all of them alter the rpm range up or down favoring higher hp in the upper rpm range or low end torque. The two mods that gives a high hp/$ ratio would be test pipes and the MD's 5/16th spacer, but again alter the rpm/hp range. The spacer gives large area in the midrange but loses at redline, where as the test pipes will drop low end torque but gain it by redline.

Edit: No amount of n/a mods will show any real gains until a tune is done. I'm going to have to agree with all the previous posts, go f/i. Nitrous is always an option.

 

There are two things you must get first for NA:

Plenum Spacer and High Flow Cats/Test Pipes

After these two mods, I would then get a new y-pipe, popcharger, lightweight pulley, and some headers.

Lastly, you'll want to get an ECU reflash after you finish modding. The reflash will be around $500.

IMO, an exhaust is a major waste of money if your main intent is to gain power.

 

+1

 

I suggest you make the poll on all these mods, since the advice is confusing enough

 

Tell you what, give me the $2k, and I'll tell you what's the best mods

 

I dyno'd 5.5whp after my JWT Popcharger install for $85. The MREV2 is NOT designed for top-end power, especially on the Rev-Ups. Its designed to gain power mostly from about 3000-6000, which is definitely does; gains easily of 15-20wtq and whp have been shown.

In the past, straight plenum spacer installs have shown to gain 8-10whp.


To the OP, you have a lot of options, but if your going to eventually go some sort of Forced Induction (I'd say within 6 months to a year) the general recommendation is to stay limited with the N/A mods. However, for $2k, you can do a good bit of N/A stuff. Popcharger, MREV2/Plenum Spacer, test pipes, and exhaust can probably be done for close to $2000 and should net you around 15-20whp, more when tuned. It will also sound better and give you more power throughout the powerband, bottom to top.