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Old 03-27-2010, 07:29 PM   #1
gabe3d
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Default Review: Cosworth Intake Manifold vs Motordyne

Even though many users have previously posted about the Cosworth Intake Plenum not performing well on non-FI car, no one has really done a good before and after test. So a few months back I took the plunge and shelled out the premium to get one to hopefully gain some power over my Motordyne 5/16th and MREV2.

As expected from cosworth and any premium items, Build quality, packaging, and looks were top notch.

Click the image to open in full size.

Click the image to open in full size.

Installation of the unit was straight forward, other than three things.
1. My box didn't come with manual so I had to get one faxed from the vendor.
2. Installing the gasket for the carbon cap is really a pain in the butt and would appear to be very susceptible to leaks.
3. The bracket on the passenger side carbon cap is not meant to last. It broke off right after I started the engine. Luckily it's not vital for the operation of the plenum.

Click the image to open in full size.

After installation, the manifold definitely looks a lot nicer than the stock setup and clears the strut bar much better. Please ignore the dirty engine bay.

Click the image to open in full size.

Aesthetics aside, how did it perform? Driving the car around a noticeable power loss can be felt down in the lower and mid range. I was quite disappointed to say the least but I never trust my butt dyno so off to the dyno it went. Below is a series of two different test comparing the Cosworth on a fully NA engine.

Click the image to open in full size.

Click the image to open in full size.

Based on these tests, it is apparent that the Cosworth is not suited at all for my application so back to the Motordyne setup it is. But I must say that the one performance advantage the Cosworth has over the MD is the ability to sustain power pass 6500rpm... to be continued.
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Old 03-27-2010, 08:53 PM   #2
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It seems just about every NA application that used the Cossie intake, wasnt too thrilled about their results.. Built or not, tuned or bolted on, there has been significant losses attributed with the Cossie intake.

Im not knocking Cosworth, they make high quality products, even after your build Gabe, it proves yet again its dominance shows in FI only applications.

I love how you put everything together, and step-by-step. That is how a true enthusiast should do it (given financial stability). Either way, KUDOS to you for stepping out and going all out

ENJOY!!!
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Old 03-27-2010, 09:06 PM   #3
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so... when those the cosi go on sale?
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Old 03-28-2010, 11:53 AM   #4
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Quote:
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so... when those the cosi go on sale?
Quote:
Originally Posted by Jay'Z View Post
Yea, cosi ready to go?
Hehe, it will be ready to sale soon. I can send you two guys a PM first and let you know before I post it up if you guys are interested.
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Old 03-28-2010, 03:57 PM   #5
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Very interesting info, thanks for taking the time doing the dyno test on a NA setup!

Is your G tuned for the spacer and MREV2?
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Old 03-28-2010, 03:59 PM   #6
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First test was tuned for the MD but the second one was tuned for the Cosworth.
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Old 03-28-2010, 10:15 PM   #7
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Quote:
Originally Posted by gabe3d View Post
Click the image to open in full size.
Excellent testing and analysis Gabe.

On a side note for your picture above... I recommend getting a heat shield for your intake. Without a heat shield your engine is ingesting ~150'F air from behind the radiator.

You can pick up a substantial amount of power just by going back to your stock intake with a clean filter.

See the plot below.
It was a test of air intake temperature Vs HP. The only variable changing in this test series was air intake temperature. 50'F to 120'F in ~20'F intervals.

Click the image to open in full size.
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Old 03-29-2010, 08:45 AM   #8
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I remember u emailing me that dyno Tony. However i cant find a 06 intake. sum1 wants to make money make a stock 06 type filter and heat shield or just a better looking one
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Old 03-29-2010, 08:58 AM   #9
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Good Info Man.

Glad I went with M/D!
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Old 03-29-2010, 01:57 PM   #10
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Quote:
Originally Posted by Hydrazine View Post
Excellent testing and analysis Gabe.

On a side note for your picture above... I recommend getting a heat shield for your intake. Without a heat shield your engine is ingesting ~150'F air from behind the radiator.

You can pick up a substantial amount of power just by going back to your stock intake with a clean filter.

See the plot below.
It was a test of air intake temperature Vs HP. The only variable changing in this test series was air intake temperature. 50'F to 120'F in ~20'F intervals.

Click the image to open in full size.
i thought allot of the heat soak issues were disapated once the car starts moving??
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Old 03-29-2010, 02:08 PM   #11
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^^ Same here. Ive looked at IAT's while moving and they fall rapidly.
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Old 03-29-2010, 03:38 PM   #12
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Quote:
Originally Posted by Hydrazine View Post
Excellent testing and analysis Gabe.

On a side note for your picture above... I recommend getting a heat shield for your intake. Without a heat shield your engine is ingesting ~150'F air from behind the radiator.

You can pick up a substantial amount of power just by going back to your stock intake with a clean filter.

See the plot below.
It was a test of air intake temperature Vs HP. The only variable changing in this test series was air intake temperature. 50'F to 120'F in ~20'F intervals.
Yeah, the reason I don't have it there is because of the aftermarket 350z radiator setup not allowing the JWT heatshield and OE Air Duct to fit correctly, but that is fixed now with some modification on those parts.

Click the image to open in full size.

I fully agree and understand that power loss will happen but after monitoring my car under operation, the intake temps drops really quick once you start moving. However there is a slight difference with and without the heat shield even while moving, especially if the AC is on (5-10F difference is what I see).


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Good Info Man.

Glad I went with M/D!
Glad you liked the info.
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Old 03-29-2010, 05:57 PM   #13
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MD has a great product...the cosworth wins in the sexitime dept though
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Old 03-29-2010, 06:23 PM   #14
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Quote:
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i thought allot of the heat soak issues were disapated once the car starts moving??
That's when you have a popcharger WITH its heat shield.

Without a heat shield its sucking in 150'F air all the time. And that's on a 70'F day. On a hot day the intake temperature will go even higher. ~180'F

EDIT: With the heat shield, the temperature will drop but it takes about 5-10 seconds before the ECU reads the temperature drop. And this means ~20HP is lost inside the first 5-10 seconds of launching.
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Old 03-29-2010, 10:55 PM   #15
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^^^ Yep, this is true. I've done some monitoring and logging when my JWT with head shield was on and idling in 50-degree weather for 1 minute raised AIT to 130-degrees, before I started moving again.

The bottom line is that the 06 OEM airbox from a VQ35DE is the absolute best intake for our motors.

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Old 03-30-2010, 07:07 AM   #16
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Good job OP! Thanks for the information...
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Old 03-30-2010, 07:21 AM   #17
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Quote:
Originally Posted by Hydrazine View Post
That's when you have a popcharger WITH its heat shield.

Without a heat shield its sucking in 150'F air all the time. And that's on a 70'F day. On a hot day the intake temperature will go even higher. ~180'F

EDIT: With the heat shield, the temperature will drop but it takes about 5-10 seconds before the ECU reads the temperature drop. And this means ~20HP is lost inside the first 5-10 seconds of launching.
Well assuming the intake is cool after those initial 5-10 seconds, the intake would then be beneficial no?

I'm questioning for track use(not 1/4 mile, twisties)
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Old 03-30-2010, 08:00 AM   #18
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In the dyno testing I've done the stock box is good as long as you change out to good clean filters on a regular basis. The stock paper filter is good as long as its clean.

The paper filter clogs faster than a aftermarket filter but it does a good job of cleaning the air flowing through it.
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Old 03-30-2010, 09:45 AM   #19
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Tony - I've never monitored the Z or G with the stock intake at a stand still, have you done so and how hot does it get relative to the outside temperature? With the JWT stuff, the temp creeps up real fast.
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Old 03-30-2010, 10:22 AM   #20
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The temperatures dont rise nearly as much on the stock box. It will go up some due to the plastic getting heat soaked from the back side, but more importantly, it does not ingest hot engine compartment air. All the air going in through the filter is ambient temperature air.

I use the stock box on my Z and G. Changing out the paper filter on a regular basis is all it needs. And it will keep your engine internals a lot cleaner too.

I've found the after market intakes let in a lot of dirt. I've opened up countless plenums to do spacer and MREV installations. And I've made some clear observations:

All the clean plenums I've opened up used the stock intake.
All the dirty plenums (caked up with thick oily mud inside of them) had some kind of aftermarket intake being used.

Based on my experience, on the VQ engine, aftermarket intakes lose power and let in a lot of dirt. That's why I don't use them.
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Old 03-30-2010, 10:22 AM
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