i have it

and i have to say it's awesome. the claims they have are right up there in terms of the motordyne spacers.

IIRC it's about 11rwhp for the 3/8 powerlabs and
14-16 bhp on the motordyne. ( please don't quote me on this )


the install was a breeze with the gaskets already on the spacer, and the hardware was good as well. there was only one down side, it doesn't really explain how to use the extra bolts and washers for the strut bar, but w/e it didn't affect me

i really loved the price point too.
nice growl after the install. and a noticeable power gain.
when i shift hard from 1st to 2nd before, it was a nice chirp,
after the install, i spin quite a bit. going into second. with a bit of fish tailing.

i would recommend getting a spacer for any VQ owner, as long as it fits.

 

So what would be the best to get for a 2005 infiniti g35x? I was looking for power and i'm reading mixed reactions between 5/16 and 1/2. I don't even know how to install them Maybe my mechanic might???? Most mechnics should be able to right? Where is the best place and cheapest to buy plenum? I know Motordyne is a good name for spacers.

 

I have the MD 5/16 plenum spacer and it SURE did add more power....I also had my car tuned (uprev'd) at Church's auto tune and have the proof of the power....in terms of install, by all means, I'm no mechanic but I was able to install the spacer easily and correctly. MD provides all the necessary hardware (longer bolts) you just need a tq wrench....you may want to invest in a z tube as well...good combo.

 

Where does a z tube go? Also I know this is a exhaust thread but I have a question about exhaust. So i was planning to get the

-5/16 iso copper plenum space
-A magnaflow 14815 muffler ( should fit my car)
-Megan racing test pipes

What Im i looking at for HP gains to that?

Also i have a 2005 infiniti g35x so hopefully all those should fit. Can anybody give me a approx on how much gain it will be?

 

Z tube goes from the throttle body to your air filter... Butt dyno gains are skewed a bit by the increased sounds... it is a much deeper, more aggressive note but the actual gain is negligable. There is a good thread on dynoing out the myth on intake mods without a tune- HERE

Worth a read. Short story is that the increased air "tricks" the ECU into dumping a disproportionately high amount of fuel which can actually dampen HP / TQ.

But any better sound you might gain from the Ztube and the spacer will be eradicated by the test pipes... And it goes without saying that if you're doing both the intakes and the exhaust that you're doing more harm than good without a tune.


To stick with the original question- I also have run the 5/16ths MD spacer with the copper iso thermal feature... I've always liked MD equipment and the instructions that come with it are easy enough to follow that I could follow it and I'm a bigger car noob than most. Pay particular attention to the way they suggest tightening the plenum down... and there's even a link to a great youtube video on it. I've read that the stock plenum will fit under most front braces with up to a 5/8ths spacer... but that may depend on the brace.


Careful investing too much confidence in Church's dyno. It's a matter of significant discussion over in the FI / Tune section as to how inflated those numbers are. Undoubtedly with a tune and the mod you gained some power... it goes without saying. But judging from what I'm reading over there you could probably safely subtract about 30HP from whatever you pulled there. Just sayin.

 

Test pipes are the worst mod you can do to your car, but you have asked the same questions over and over again and been told the same answers......so enjoy the test pipes

 

^^ +1, why you no risten??

 

Why is that? So i should just stick with the Magnaflow and plenum spacer and Ztube? I don't mind the sound of my sedan right now but I would like it louder!! So after I get all this or even before i should get it tuned? Right now I dont have any air intakes on my G because i heard that a Short air ram intake won't have any affects for my car unless I get the ones that run down to the front wheel there. I appreciate all the insight!! I found a 5/16 plenum spacer on ebay for about 260 shipped is that a good price?

 

Go back to the first or second thread you asked all of the same questions and I wrote you a novel about what I would do. The difference between any air take and a drop in filter is likely minimal aside from noise. From the best to the worst there may be a 3whp difference. I haven't needed CAI in about 5years now so I could be wrong but they don't show big gains if I recall and test pipes will drone/rasp and make your ears hurt while cruising not to mention the fuel smell that will linger in your car and on your clothing. If you need test pipes get resonated ones they won't drone or at least they didn't for me but I was already twin turbo when I added them.

 

High flow cats would probably be a better option than TPs overall... Louder and deep is one thing- louder like you've got a wasp trapped in a megaphone is quite another- which is exactly what you'll get with TPs- even resonated- at least that's the impression I'm getting from what I read. You could save some money on resonated TPs but you'll likely need to get resonators of some description put in and that will gobble up anything you saved. Ceramic coated HFCs (Berk) sound like they eliminate rasp- and that was the direction I was heading before I went TT.

If that spacer is used then I wouldn't say that's very good at all. Brand new (with iso thermal) before shipping they're 260... And believe me in our climate you are MUCH better off with the iso thermal upgrade.

If you're talking about used ones on ebay- assuming it comes with everything generally guys will ask a bit more than half that cost plus shipping. US ends up being a bit of a pain because of the additional cost, the dollar and customs / taxes. 260 shipped to your door and with the iso-thermal upgrade... Sounds hefty but I know sometimes I've paid more just because it saved me from having to dork around and look all over the place.

 

thanks for the heads up...why would their dyno's be so much more 'inflated'? what is the best dyno thats out there?? I'm sure everywhere there's a dyno, there will be differences...I don't mind going elsewhere to get another run....the biggest fun is knowing I'm getting a lot more than the stock output

 

There is some discussion about Church's happy Dynapack here

Yeah I hear ya. I'm in the opposite boat right now. The dyno I'm on (Racing Greed's near Vancouver) apparently runs a safely assumed 15% lower than a dynojet dyno. I'm running a built block and 700bb JWT and put up 383 / 400 at 18psi? AYFKM?!

Dynojet seems to be a pretty good standard to measure against but like you said... whatever the number is, and whatever dyno you use performance on the street and driver satisfaction is the key factor! To be honest I don't know that it would be worth any more pulls just to rack in numbers unless that's your thing. Just know that some folks in here who know what they're talking about don't consider the Dynapack numbers at wholesale. You can see some of that discussion in the link above.

 

^ cool, thanks...I will read up on that thread.

I will get another dyno and tune once I finish installing the next few items on my list:

MRev 2
possibly HFC's

BTW, is your car for track or daily driver?? I'd love to have a forced induction Infiniti -- possibly on a G35 (I'm shopping around for one) and keep my M garaged...

thanks again...

 

So Test pipes are a NO go, What is the best brand for high flow cats and what i'm i looking to spend? So would a spacer like this work?
http://www.ebay.ca/itm/MOTORDYNE-5-1...s_Accessories&
hash=item53e8f8609a
I'm still looking for a magnaflow but no to luck I just might try to find a local shop in my area for them instead of online.

 

test pipes are the best mod you can do! Go back to the drawing board.

I am so confused!?!?!???

here is my stock exhaust w resonated test pipes and k&n drop in w z tube

cant hear it on the highway at all, smell is only w windows down at a stop light