So I am thinking of getting the motordyne spacer which size should i get and should i get the thermo.

Or should I get the crawford Plenum

Or can i use both

 

uhhhh does the GF know about this one??

Can't remember..... are you 5AT or 6MT??
If 6MT then there is no benefit, until Motordyne comes out with there NEW unit.

If 5AT; I have the Motordyne with Thermal isolation & am very happy with it.
It seems most are going for the spacer these days.

 

I went with the 5/16 Motordyne spacer so I could put the engine cover back on and keep it stock looking.

For the difference in the amount of HP they both claim, the difference in price and looks, I think the Motordyne is a better buy. JMHO.

 

I like, have always liked the Crawford. The Motordyne, while effective at feeding the front two cylinders, still leaves the mismatch in the air/fuel mixture between the front and rear cylinders. The Crawford equalizes and eliminates the mismatch.

Lou

 

Is that your opinion or do you have information to substantiate??

 

Look at the form factor of the two products installed. The spacer still leaves the plenum cover angled with the large area in the back, and the small area in the front. Thie cover was designed this way, so it would accommodate the strut bar and the angle of the 350Z hood. The Crawford, on the other hand, is level from front to back.

Lou

 

Flow dynamics are much more compilcated than that.

 

He could replace millions of dollars of CFD gear if he could eyeball it.

 

Mr. inTgr8r

The Crawford flat out works. My seat of the pants proves it, as does my dyno. Crawford did a lot of research before they decided on their form factor. One of their prototypes was in fact a spacer, but they decided to go with a complete new cover because of the reasons I stated above.

BTW, I never said a Motordyne wasn't beneficial, because it is. I've been there, and seen a before and after dyno, where the Motordyne added 6hp to an '05 6MT with the new motor.

This thread is for opinions, I stated mine, and my reasons for it. IMO, they are valid. You seem intent on starting an argument, with no facts or opinions. I will have none of that


Lou

 

What are the gains your dyno show? I'm curious to see if Crawford claims are true.

As for the Motordyne spacer, 6hp is about right. Not alot but again the new sound alone makes it worth it for me. I've never heard the Crawford, but I'd love to?

 

Sorry if I missled you Lou;
I don't dispute that the Crawford is an excellent product.
I know they did lots of product R&D.

It just wasn't clear to me, in your earlier statement,
whether that was your personal opinion or not...

What I was trying to getting at is,....
it would be great to see flow test results (at the ports)from these
and other intake products.

Irregardless of dyno results, that's the only way to say if flows are balanced.

 

I have been contemplating this same question. Have read very much on the forum and have come to the conclusion that if I choose to do this mod, I will go with Motordyne and ISO thermal upgrade.

After going through many threads, Motordyne seems to be the only one of the two actually posting DYNOS.

Also after reading through many threads, it sounds like the difference between the to is a couple of hp.

 

I have a 2003 "G" 6MT Coupe.

Mods:
TechnoSquare Crawford Reflash ECU
JWT PopCharger with "Z" Tube
Crawford V4 Plenum
Crawford HiFlow Cats
Crawford Headers
Invidia G200 Dual Exhaust with "H" Pipe
Ground Wires

My Dyno is the blue line. The red line is the aformentioned '05 6MT coupe with the motordyne spacer. Warm summer night in Tuscon. DynoJet Dyno. Before the spacer the '05 dynoed @ 242hp. I have no before readings of my Coupe because my mods were incremental.

Lou

 

So Ian for 6mt coupe which I have there is not point in getting the spacer until the new one comes out.

And no gf does not know as this is coming out of my bonus hehehehe.

 

Lou do you have a comparison with an '03 or '04?

The comparo with the "revup" engine is invalid.
The '05MT has a redesigned intake & internals.

The Crawford would loose "gains" on this engine as well.