Location: Carlisle Fairgrounds, Carlisle, Pennsylvania, USA
Elevation: ~450 ft
Dyno: Axcelerated Motorsports Dynojet 248H High Inertia Chassis Dynamometer
Vehicle: 2004 Grand Prix GTP Competition Group, 93 Octane Gas
Modifications:

• ZZP 3" Stainless Catted Downpipe
  
• ZZP Stainless Powerlog
  
• 9" Oiled Intake Cone Filter
  
• 3.4" Supercharger Pulley
  
• 180* Thermostat
  
• Autolite 104 Spark Plugs
  
• 10.4mm Taylor 409 Pro Race Spiro-Wound Spark Plug Wires
  
• Overkill Tune

Test #1:

• Thrasher "Cold Air Intake" Box
  
• 2 "Runs"
  
• 10:04 AM
  
• 83.56* F
  
• 29.66 inHg
  
• 25% Humidity
  
• HP: 222.50 @ 5,000 rpm
  
• Max HP: 223.81
  
• Torque: 260.60 @ 3,400 rpm
  
• Max Torque: 261.18

Test #2:

• "Open Cone" / "Hot Air Intake" (Box Removed)
  
• 2 "Runs"
  
• 2:23 PM
  
• 92.48* F
  
• 29.61 inHg
  
• 9% Humidity
  
• HP: 223.98 @ 4,900 rpm
  
• Max HP: 224.66
  
• Torque: 263.44 @ 3,500 rpm
  
• Max Torque: 264.46

Side-By-Side Comparison:


Close-up of HP/Tq Intersection:


This was by no means a perfect test, mostly given the changes in ambient air temperature (a difference of 8.92* F), but it's better than nothing. I am led to believe that given the same ambient air temperature, the difference in power would have been slightly greater, as the open cone test was run under hotter ambient temperature. I think it is also worth pointing out that the open cone also allowed more supercharger "whine" to escape and seemed to draw the attention of more fairgoers.

Food for thought....nice thread. I'm running open cone because I haven't had time to complete my FWI. Hmmmm....I will probably just leave it open coned.

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Yeah, I'd be happy to try a fenderwell intake if someone was willing to lend us one for an afternoon, since this doesn't in any way disprove the function of those.

well ive been planning on some kind of cai set up after my car is payed off. i know how to do the fender well one but are there any guides on how to do just an open cone?

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All sho no go...

I'd be happy to lend ya my FWI if you guys weren't 5 1/2 hours away from me lol

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GPDIY - For All Your DIY Needs
VS CAM|3.4|HEADERS|FWI|42.5#|HPT|6000k LOWS|8000k FOGS|

Here's a quick tutorial:
1. Purchase a 9" cone intake for $45.
2. Remove intake box.
3. Attach cone to mass air flow sensor
4. Profit

...it's particularly cheap and easy. That $150 "cold air" box is now just a paperweight.
Also, I doubt a cone intake would void your warranty... but others should know better than me.

-- Wed Jun 30, 2010 2:36 pm --



Hey, come on out for a car show!

...did I remember reading before that you get insane gas mileage?

Was contemplating intake setups. Was already thinking about going FWI until I could afford a Thrasher "box". But now I think I'm just going to do a FWI and call it good. Granted, I'm NA and that's different...

Thanks for posting the DynoJet. So mad I missed GM Nat's this year. Living in Kentucky is really messing with me getting to go to any Carlisle shows. (Since it's like 10 hours away now instead of 2.... argh.)

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2008 Dark Slate Metallic Grand Prix SE
Mods: Engine Bay Dress Up, DR DoorlockKnobs, PWNTIAC plate, Aux Input, HIDs, Liz's tinted tails, 4th B.L., audio stuff, tint, Interior LEDs, HV3, 180* stat
Next to Install: GXP Spoiler, Special Edition Fascias, Exhaust, HUD

Interesting.
Were the tests done with the hood up and a fan blowing throught the radiator?

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2005 GT owner [Non S/C] with a "big DIC".
Two years later and I still love the car.
Thanks Pontiac...Bleen is keen!

a very cool test. but i wonder how one could mock the ram air affect (of having a box vs not) as in higher speeds or racing.?

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Yes, hood was up. Next time we get the chance, we'll test with a fully heat-soaked engine bay, open cone, and the hood down.

-- Thu Jul 01, 2010 1:32 pm --



Wind tunnel.

-- Thu Jul 01, 2010 1:36 pm --




GM was a pretty weak show... otherwise I probably couldn't have gotten on the dyno twice.

Wish I could test a FWI. Frankly, the added fabrication time and maintenance time... and debatable, unproven gains are enough to steer me clear of one. Nothing in the world simpler than open cone. Though, I suppose I should have put the Thrasher box up for sale before I posted this... so much for thinking ahead.

What I would do is install the open cone and do a WOT test on the road,engine warmed up.
Record the max MAF at say 3,500 & 5,000 rpm.
Install the cold air kit immediately and redo the test.
That should give you a pretty good idea.

_________________
2005 GT owner [Non S/C] with a "big DIC".
Two years later and I still love the car.
Thanks Pontiac...Bleen is keen!