997Current model of the 911 C2, C2s, C4, C4S, Targa and Cabriolet Discussion. Sponsored ByHRE Wheels
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And it is a fact that the hoses on an X-51 and the standard 997s are different sizes in Dia, length, and shape.
+1
I have X51, but cant install it(( TB is less that X51 dia. Has anuone idia how to install it withouy major modifications?
Maybe someone find aftermarket hose to fit X51 airbox with standart TB?
After much study I jumped in and did the X-51 airbox.
Cutting the hole was a major PITA. A couple of pointers get the X-51 upgrade TSB. Take off the painted portion of the Spoiler, it is only 4 screws and very easy to do. The cutout pattern in the TSB is a little small even if you print it with no margins. I enlarged it 102% and it worked fine.
Installing the Oil Fill pipe is also a major PITA. In addition to removing the ALternator which is difficult as previousily discussed I also removed the plenum which gave me more room to work. Removing and reinstalling this is easy as I had done before with the RSS Plenum.
As far as Adapters I bought the following from BoostController.com and after cutting it length with an exacto blade it worked perfectly;
Silicone Straight Hose, SHORT - 2 inch length #ASCSHS2-X
Size - 3.25 inch ID (add 5.00)
Color - Black
The dealer who sold me the parts also recommended the following; Hoover Vacuum belt for the Self Propelled WindTunnel is a perfect fit (part number 38528-035).
I also had to trim a little bit off the edge of the x-51 Boot to get it to fit correctly on the TB. I also had to push the clamp on in that same area with a screw driver.
It was a very challenging project but I am glad I did not only for the looks but the performance gains mentioned earlier.
RSS also has a modified TB which I added at the same time. They basically improved the aerodynamics by machining the entrance to more of a point for a venturi effect and machining the Shaft so air flows around it better.
Thanks guys, if you do just the cold air kit upgrade which is the hose and block off, you will see approximately a 4-5 HP gain without the BMC filter. The BMC filter makes a big difference because they complement each other when done together and you see the full potential of hp gain.
Thanks,
+1 this setup... my car is stock except for a Fabspeed CAI and a BMC Filter. Once I put this combo in my car immediately felt different. I thought my S felt sluggish, the CAI makes a AWESOME sound someone thought I had a exhaust system on my car the other day and the BMC makes some Hp. So its a sweet combo for the price. I strongly recommend it
__________________
2005 C2S CAB AS > Blk Full Leather
NAV...K40 Radar...TOOKI BT
After much study I jumped in and did the X-51 airbox.
Cutting the hole was a major PITA. A couple of pointers get the X-51 upgrade TSB. Take off the painted portion of the Spoiler, it is only 4 screws and very easy to do. The cutout pattern in the TSB is a little small even if you print it with no margins. I enlarged it 102% and it worked fine.
Installing the Oil Fill pipe is also a major PITA. In addition to removing the ALternator which is difficult as previousily discussed I also removed the plenum which gave me more room to work. Removing and reinstalling this is easy as I had done before with the RSS Plenum.
As far as Adapters I bought the following from BoostController.com and after cutting it length with an exacto blade it worked perfectly;
Silicone Straight Hose, SHORT - 2 inch length #ASCSHS2-X
Size - 3.25 inch ID (add 5.00)
Color - Black
The dealer who sold me the parts also recommended the following; Hoover Vacuum belt for the Self Propelled WindTunnel is a perfect fit (part number 38528-035).
I also had to trim a little bit off the edge of the x-51 Boot to get it to fit correctly on the TB. I also had to push the clamp on in that same area with a screw driver.
It was a very challenging project but I am glad I did not only for the looks but the performance gains mentioned earlier.
RSS also has a modified TB which I added at the same time. They basically improved the aerodynamics by machining the entrance to more of a point for a venturi effect and machining the Shaft so air flows around it better.
Thnx!
Do you have photos of parts and setup install?
I recently put the Fabspeed CAI on my 2008 997 Carrera - cap and hose. I also did a little refresher on cavity resonance design, from my old acoustics courses. I think that cavity is designed to damp out some lower frequencies when you're on the throttle and getting a good airflow thru there. Also, the smooth hose reduces pressure losses and will get you a slightly higher static pressure at throttle body inlet. Other observations:
1. the engine basically sounds the same at idle as stock.
2. I have noticed better throttle response on throttle blips and the intake/exhaust sound has more low frequency content, resulting in a bit louder sound, probably at least 3dBA since that's what the human ear can really recognize anyway.
3. I have noticed the car is a bit more quick (maybe 0.1-0.2 sec quicker to 60).
3. I wanted something inexpensive, and really for $225 it does 3 things: better sound, better throttle, and I've also noticed a little bit better fuel economy, probably due to a little higher pressure at engine inlet.
It's a simple fix but I'm all for it. The sound is good enough that I'm sticking w/ stock exhaust, for now.
I recently put the Fabspeed CAI on my 2008 997 Carrera - cap and hose. I also did a little refresher on cavity resonance design, from my old acoustics courses. I think that cavity is designed to damp out some lower frequencies when you're on the throttle and getting a good airflow thru there. Also, the smooth hose reduces pressure losses and will get you a slightly higher static pressure at throttle body inlet. Other observations:
1. the engine basically sounds the same at idle as stock.
2. I have noticed better throttle response on throttle blips and the intake/exhaust sound has more low frequency content, resulting in a bit louder sound, probably at least 3dBA since that's what the human ear can really recognize anyway.
3. I have noticed the car is a bit more quick (maybe 0.1-0.2 sec quicker to 60).
3. I wanted something inexpensive, and really for $225 it does 3 things: better sound, better throttle, and I've also noticed a little bit better fuel economy, probably due to a little higher pressure at engine inlet.
It's a simple fix but I'm all for it. The sound is good enough that I'm sticking w/ stock exhaust, for now.
I just kept the stock air filter. I'll replace it when it's coming due, probably next summer. My car has 14k miles. From what I hear the BMC gives better airflow. With that, the sound may improve just a tad more.
None of the improvements (fuel econ, throttle response, and sound) from the perf intake were huge, but all were noticeable and an improvement to the driving experience. Note that I don't think it's a true "cold" air intake, because nothing is really re-located, but I'll call it a performance intake, and for the price the improvements are quite good. Hope this helps.
____________
2008 C2, Black/black, 6-spd, Nav-TV, PCM w/ Nav, XM, Pwr seat pkg, Xenon, Fabspeed CAI, 'S' silver trim, CF trim
Last edited by chance6; 11-10-2009 at 08:23 AM.
Reason: addition
I dont think anything needs to be changed to make it a cold air intake. The snorkel is drawing in fresh air from outside the engine bay, so I would consider that cold air....vs. drawing in hot air from inside the engine bay.
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