What do you think of this combo? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-28-2003, 11:01 PM   #1
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Default What do you think of this combo?

I am really tight on cash so I am thinking of going with the K&N installation kit from PFYC.com an the K&N RX-4750 filter, for a total of $80. Sound good? Does anyone have the RX-4750 filter? Can you tell a gain in HP at all?
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Old 09-28-2003, 11:28 PM   #2
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I have that filter, so does Will and Mach. It'* hard to "feel" the difference between this and the previous filter on the ADTR, but it is a much better and bigger filter, with a real velocity stack. The airflow is higher for sure, but it'* hard to say how much hp this adds compared to the other cone (Will or Mach, can you add your experience here)

But in your case, you will feel a very nice gain with this filter compared to stock. Enjoy it.
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Old 09-29-2003, 12:28 PM   #3
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One problem with what you plan......your filter is going to be right in the 'heat'. You need an intake pipe to get that filter to the headlight area so that it can pull cool air, not hot.

The filter probably means alot more on a forced induction car, but it'* the best fit for the money for the space between the dual washer tank and rad for us. The most filter area money can buy, and a velocity stack for good measure. The airflow is better, as I've noticed my idle 'calm down' with this filter. The velocity stack really seems to be doing it'* job.

That'* the filter in my sig below.
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Old 09-29-2003, 09:08 PM   #4
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Do you think its possible to make my own pipe somehow? I figured I could use the stock hose and a piece of pipe and connect the filter at the end to save money. How would I go about connecting the sensor to this setup if I could pull it off, just drill a hole? Also I have only the direct replacement K&N Filter now so this cone filter should do alot better job than this one right?
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Old 09-29-2003, 09:14 PM   #5
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Yes you can make your own pipe, i.e. have one bent for you. Smellbird had one done for $18. And yes, the K&N you have now does little for performance compared to this cone.

You will probably like to have all smooth piping for the intake as the stock tube creates some turbulence. You'll want the smoothest/straightest path possible for the air.
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Old 09-29-2003, 09:38 PM   #6
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The filter we're talking about has a hole for the IAT sensor.

Don't keep anything resembling the stock 'accordian tube'. It'* self-deveating.
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Old 09-29-2003, 09:42 PM   #7
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Quote:
Don't keep anything resembling the stock 'accordian tube'. It'* self-deveating.
Ooops...maybe we should get that off of the GTP then. I thought that might be hurting the airflow.
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Old 09-29-2003, 09:47 PM   #8
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Shawn, I can gaurantee it'* killing you. One of the main benefits of the cone filter setups is high velocity, laminar flow. That accordian tube messes it up right before it enters the TB. Smooth wall, no joints, preferable mandrel bent or cast in one piece.
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Old 09-29-2003, 09:58 PM   #9
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The problem is it has to be something flexible. With the intercooler it is more than a 2" drop to be flush with the filter in the airbox. So it would need to be something smooth but flexible so it could go from the air filter up to the throttle body, or it would have to be custom made to fit. That is the main problem we have been having with it. The accordian tube that came with the Thrasher Airbox is the only thing we can get to fit. If you can recommend something that is smooth but flexible enough to make the 2+" drop please do, because it would be nice to get that replaced.

Thanks.

Shawn

I don't know if you can see what I am talking about in this pic, but it is the only one I have of the engine bay, and you can kind of see it, so maybe you can tell.

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Old 09-29-2003, 10:04 PM   #10
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The black silicon reducer on my TB in the pic below may suit you. I don't know if it allows 2" of flex, but it'* smooth. I know it does flex some with engine torque, but I've never had the luxury of being under the hood under load!

I can tell you I can LIFT my CAI about 2", and it settles right back into place.
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