924Board.org

speedsta2003 · Joined: 12 Nov 2002 Posts: 302 Location: Lincoln, Nebraska

is the air flow maxed out on the 924S? I definately want more airflow, but Im not sure if it will make a difference if I put in cold air intake or ram air. From looking over previous topics, Ive noticed many people say that the 924S takes as much air as it can, so adding mods wont make a difference. I think putting in ram air will make a difference, but before I spend money on doing this mod, I want other people's educated opinions. The prices from what Ive seen are: $160 cold air system, $50 air filter, and $160 hood scoop. Intake Cost: $370
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Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

if you're concerned about airflow thru the intake on the S (I have no idea if it's good or bad) then check this http://www.autospeed.com/A_0629/page1.html and measure it yourself before you go out and spend money you might not need to.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

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jpab924 · Posted: Mon Dec 02, 2002 12:50 pm Post subject:

I would like to see actual documented results before I vote....

I`ve seen a formula in something I read, on how to determine the net gain of airflow. If I remember right, the formula actually determines the increase of the airflow proportional to vehicle speed.

I believe the biggest gain would be the cooler air, which is more dense. ( In essence, packing in more molecules.)

For the ram air effect, you will have to make sure the piping is of adequate size to overcome the restrictiveness of the air filter.

Not too sure on whats available for your car. Is this something that is made for the 924s`? Or something you are planning on throwing something together?

Either way, if you plan to buy a system that is specifically built for the 924s, look at the spec sheets and look for a difference. (and post them here so I can vote

) If you plan to build your own, you need to know your math.

speedsta2003 · Joined: 12 Nov 2002 Posts: 302 Location: Lincoln, Nebraska

I plan on getting this... http://9xauto.com/944.html
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red240ne · Joined: 23 Nov 2002 Posts: 12

the intake on the 924 is already placed really well and is low, which lower is better. you probably won't need any short ram intake unless you want to free up some space to go turbo in the future. there's not a whole lot of room for IC piping under the hood.
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924RACR · Posted: Mon Dec 02, 2002 11:47 pm Post subject:

Cold air can help, if properly done; must seal out any source of heat from the engine bay, and not create a chance to suck in water and hydrolock the engine (don't laugh, 944's can suffer from this).

Ram Air is a Pontiac marketing gimmick - don't believe the hype!

Cold air is best done by materials sourced from Home Depot. Don't laugh, real racers know you can find the best race parts there. Ricers buy K+N filters online, and slap the stickers on the car. Real racers get their own sheetmetal and weatherstripping from HD. Check out some IT cars sometime for what works, cheap.

I won't even get into K+N's and dirty air. Just don't think you can out-think Porsche so easily. Hondas and Nissans, et al, benefit greatly from air intakes and exhausts because they were designed as economy cars; comfort and economy. Porsche are, always have been, and should've will always be (Chili Pepper excepting) sports cars, and are designed as such - for performance.

Sure, there are ways to make them faster. It's not a cheap air filter and plastic scoop, though. Do some more research first.
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jpab924 · Posted: Tue Dec 03, 2002 3:53 am Post subject:

Heres an article I found on ram air induction on a scout truck complete with the formula.

http://edge.edge.net/~deschamp/ramair.html

speedsta2003 · Joined: 12 Nov 2002 Posts: 302 Location: Lincoln, Nebraska

Or how about this intake
http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=18&t=002400
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Lizard · Posted: Tue Dec 03, 2002 8:26 am Post subject:

if you are looking to get more power out of the engine rebuild w/ some high CR pistons, P&P and get a Wild cam
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81turbo · Joined: 03 Nov 2002 Posts: 1065 Location: Oakland, CA

Or just buy a turbo (951), talk about head flow.

Joes924Racer · Posted: Sat Dec 07, 2002 4:21 pm Post subject:

Porting and polishing a turbo head can yeild 55 percent more air than the stock head. Clearly, by using the stock size valves and flowing more air through them, port velocities had increased radically. Alls left is uppen the compression.
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Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

Joe, where did you get the 55% figure from? Are you saying 55% more than a stock 931 head or a stock 924 head?

Take a look at http://www.pumaracing.co.uk/mainmenu.htm and check the General Tuning Guide under the Tuning Guides heading.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

Joes924Racer · Posted: Sat Dec 07, 2002 7:49 pm Post subject:

the Turbo head flowed an additional 25 percent more air than before the modifications, and a whopping 55 percent more air than the stock head. Clearly, by using the stock size valves and flowing more air through them, port velocities had increased radically. More port velocity and airflow combine to produce several effects; improved low end torque with better drive ability, more efficient cylinder filling and , most importantly, more power.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

speedsta2003 · Joined: 12 Nov 2002 Posts: 302 Location: Lincoln, Nebraska

Where can I get a modified Cam? All I can find for the 924S is oem. Are the valves at maximum heighth, or is there someone I can pick one up for cheap? Thanks
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Carnut 280 · Joined: 28 Dec 2002 Posts: 101 Location: Denver, Colorado

for a performance cam go to www.huntleyracing.com IF it's a 924S, if it's a regular 924na, I dunno where to go. but the 944 high performance cams will fit on your 924S, as it is the same motor. Huntley has 3 different cams, adding up to 20 HP, and it's a core shipment thing. I think it's $360 something for a cam, as long as you send em your old one. sounds like a good deal, and I'll be doing it on the next rebuild...
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