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Stu2j · Posted: Tue Nov 05, 2002 9:17 am Post subject: Is this a worthwhile upgrade?

This looks interesting...

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1871950428

I would appreciate and thoughts and/or opinions.

Thanks
_________________
-Stu
924 owner since 1988
924S owner since 2002
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Paul · Posted: Tue Nov 05, 2002 11:14 am Post subject:

I'd pass.

The vent hose for the timing belt cover will sometimes suck up pieces of a failing belt. With this setup you'll be sucking them into the motor.

If you ever see pieces of the belt on top of your existing filter, don't start the car until you've replaced the belts.

Lizard · Posted: Tue Nov 05, 2002 2:42 pm Post subject:

yah but if your timing belt goes you are going to have alot more to worry about than just pieces of timing belt

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3 928s,

924RACR · Posted: Wed Nov 06, 2002 12:13 am Post subject:

Nothing like a hot air intake to slow an engine down. Speaking of hot air, I can cut you a good deal on an nice performance air filter, worth 15hp bolt-on!

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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
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nd4spd924S · Joined: 05 Nov 2002 Posts: 14 Location: chester springs pa

this hot air problem can be fixed by putting a vent in the hood above the cone filter you can get it at www.9xauto.com works great at pulling in that nice cold air

Stu2j · Posted: Wed Nov 06, 2002 1:04 am Post subject:

Lizard · Posted: Wed Nov 06, 2002 2:08 am Post subject:

check under general discussions and look for "gotta have this intake"
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3 928s,

Stu2j · Posted: Wed Nov 06, 2002 2:21 am Post subject:

Porschephile · Joined: 04 Nov 2002 Posts: 825 Location: Denver, Colorado

I hear that cone filter thingy is useless on 8 valve motors. like, it's good when the engine is cold, but ya don't wanna run the engine past 3k rpm when it's cold anyway, so what the hell is the point?
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werd B.

Stu2j · Posted: Fri Nov 08, 2002 12:39 am Post subject:

Please continue this discussion as I am very interested in this. If this mod were completed including the GT hood scoop above the filter to bring in the cold air. Is the claim of increased horsepower reasonable?

Or would I just have an expensive hole in my hood

This seems like a fairly inexpensive performance modification if the performance claims are correct.
_________________
-Stu
924 owner since 1988
924S owner since 2002
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Porschephile · Joined: 04 Nov 2002 Posts: 825 Location: Denver, Colorado

I dunno...you'd think the hood scoop would help, but in the end, I'd just think you'd have a hole in your hood and wallet...
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werd B.

jcope · Joined: 05 Nov 2002 Posts: 157 Location: Littleton, CO

I cut and paste the following from the K&N filter discussion. It was posted by dgz942s:

"The main issue is the engine can only take so much air. The engines are designed with the maximum intake abilities stock.. With that, the increased air flow is cooler but the cylinder can only hold so much air, not as much as the K&N will provide. So the benefit is minor at that and the engine is also getting less filtered air so it gets dirtier faster. If you don't keep this filter CLEAN on a regular basis, the engine is going to eat alot more dirt than it should! The best thing you can do is to isolate the stock air filter (extra space in air box)by filling the dead space in the box to "funnel" air to the intake. POWER is achieved by head and cylinder work or go turbo....GL! D"

I think I agree with this. So I don't expect any benefit to making this modification, even if you find a way to get cold air to the filter.

Stu2j · Posted: Fri Nov 08, 2002 6:32 am Post subject:

I tend to agree that simply replacing the filter inside the current intake system would only show negligible improvement.

However, this is replacing the entire intake system. It seems to me that increasing air flow in conjunction with additional air cooling would almost have to provide some improvement.

They claim 10hp. That's a lot of hp for the price of this mod and the reason I am so interested. Even if it were only half their claim, it is still pretty good.

Yes/No?

(Given the repsonses, I guess it is safe to assume that nobody here has actually attempted this mod. Maybe I'll have to be the test pilot on this one).
_________________
-Stu
924 owner since 1988
924S owner since 2002
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jcope · Joined: 05 Nov 2002 Posts: 157 Location: Littleton, CO

The point of that post was that getting more air into the engine is not going to buy you anything, whether you replace the filter or the entire intake. The intake is optimized already. You can replace it with another optimized intake, and you just get the same performance. I'm not an automotive engineer, so I can't say whether this is actually true. If you find replacing the intake gets you more performance, then what you've really found is that the Porsche engineers chose a suboptimal intake for that engine. That seems contradictory to me. I don't know why they would do that.

One thing I haven't seen anyone say on this forum for the entire time I've followed it is that the Porsche engineers screwed something up. As far as I can tell, even minimal horsepower gains seem to cost a hell of a lot. If the intake were really restrictive, there would have been 90 topics on it already and 100 different solutions. Look at how many options are available to modify old Chevy engines. Look how few there are for these cars.

Stu2j · Posted: Fri Nov 08, 2002 8:48 am Post subject: