I'm still new to the whole Z scene and want to get as much feedback as possible. I was just wondering if there is any one plenum spacer that is better than the others? And has anyone had any problems with underdrive pulley's like with Honda's?

 

Motordyne spacer so i've read.. Ordered mine and it should coming this week i hope! Try searching the forums!

 

Check the Sport Z magazine plenum vs plenum spacer results posted here.

 

Two questions that usually present very differing answers.

First off, the underdrive pulley. Many people will tell you that it will bring a quicker end to your engine, and many others will tell you it is a good way to free up a few horsepower. I'm in the second camp. I've had my Unorthodox Racing crank pulley on for close to a year now with no issues whatsoever.

Now, the plenum spacer. If you check Motordyne's website, they have the Sport Z dyno comparison without names, but it's easy enough to figure out which plenum and spacer is made by which company. The Motordyne 1/2" put out the highest HP #, but the 5/16" spacer has a slightly larger area under the curve, and also fits with the stock strut bar and engine cover. I just installed the 5/16" spacer on my Z and love it, would definitely recommend!

 

I had nice gains with the 5/16 spacer & pulley. Refer to sig.

 

Thanks for the input I just want to get everything right the first time without any possible problems in the future.

 

Thanks for the input I just want to get everything right the first time without any possible problems in the future.

 

You already started on the right track by researching. I suggested reading through:
https://my350z.com/forum/2003-2009-nissan-350z/172411-everything-install.html
https://my350z.com/forum/2003-2009-nissan-350z/174222-gained-17rwhp-and-10rwtq-n-a.html

 

I have the 3/8" MD spacer and love it. Tony at motordyne is great - I had bought mine used and he helped me get all the misc. parts I needed.

I just ordered the UR under-drive pulley set. ($275 for complete set w/ belt and shipping.) PM Primo8998 for details.

 

i installed the 1/2'' spacer and love it although it does hit my hood alittle bit but who cares!
p.s i have the ts seibon cf hood

 

You weren't able to use the stock strut bar either, correct?

 

Got my MREV kit on order. Should have it here and installed by tomorrow.

 

if he is using the 1/2" spacer, then no, the stock strut bar will not fit!

 

Thought so. That why I went with the 5/16th spacer. Stock strut bar and no rubbing issues.