924Board.org

[Bumblebee77]

Yo all, this may sound a little dumb but aside from a fresh new air filter would you have any recommendations for getting my car to breathe better? Its a stock 77 NA 924. Perhaps a bigger exhaust as well...?

The air filter/intake system doesn't seem to be the most efficient set up.

[Lizard]

Alot of people have thought about it.

Noone has really done anything about it. ESP not for a bone stock car.

If you are going to do anything with the intake, then you convert to EFI, then you add a custom turbo/SC setup, and make some real power.

but most see the price of MSII efi brain and give up as it is over $50.
No offence to anyone but that is the reality.
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3 928s,

[Rasta Monsta]

Good results have been had grafting on a 944 exhaust system. . .bigger pipe.
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Bumblebee77]

Hmm... yeah, i think the 944 system idea might be the way to go for me. Probably a bit more straightforward and cost effective than turbo or super charging. I definitely don't have the kind of cash to do anything like that.

In terms of the system's inefficiency, more specifically, i meant that the intake pipe doesn't even really seem to be drawing air from anywhere in particular... just a general space in the lower, front-left portion of the bay and a smallish, downward facing hole underneath the intake.
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77 NA 924
Hopefully one day a little sleeper... although at this point i'll settle for the bloody thing to start...

[Rich H]

Bear in mind that the air filter is the least of the engines problems.
There are other places to look but none will make much differnece in isolation.

There is no simple way of making big power from this lump, it was allegedly designed by Porsche specifically to resist simple tuning.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Bumblebee77]

I'm not looking for big power in one fell swoop... just looking to improve on little bits and pieces and checking on the engine the other day was just struck by the strangeness of the intake system.
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77 NA 924
Hopefully one day a little sleeper... although at this point i'll settle for the bloody thing to start...

[Rich H]

Its all to do with the K-jetronic fuel injection system.
State of the art in 1975

I would be looking at making sure all the suspension is in top form before looking at the engine. A decent set of shocks and bushes makes a hell of a difference!

There are alot of guys on here with alot of experience that are worth listening too, they have been there and done that in most cases and, in my experience will help out even when you have done something stupid...
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Bumblebee77]

I appreciate it and totally agree... however i think you're missing where i'm coming from in this particular query. I'm not asking specifically about how to get more performance from my car just through the air intake system. In another post after a talk with ideola i've come up with a design plan for my car and how to hopefully achieve my goals with it. In this particular instance i was simply asking if there's something that can be done to improve the car's 'breathing' as the air intake system - that is, the pipe leading into the air filter and on from there - doesn't seem all that efficient to me. The intake path for the pipe is hiding pretty much directly behind the pop up headlight housing and the only real path for air into it aside from ambient air sucked up from underneath the engine bay, appears to be nought but a fairly smallish hole underneath and back from the headlight housing.
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77 NA 924
Hopefully one day a little sleeper... although at this point i'll settle for the bloody thing to start...

[Rich H]

Fair enough

I would think that the air intake, while not as free flowing as it could be, is adequate for the car as is. The Air flow meter provides much more of a choke point than the intake.

I don't think there is a particular problem with the inlet location, its pretty drafty (Well it is on my car!!) but there is no reason you could not make a cold air intake up to draw air from outside the car. Maybe from infront of the rad? Would provide clean cold air while remaining high enough not to suck up water and protected from sucking up rubbish/wasps/leaves/etc.

My intake needs something like this as it draws hot air from the engine bay, it gets up to about 20C over ambient...
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Vince Ponz]

Try a free flow filter like a KN.

Try to route the incoming air away from heat. Insulate where needed.

MY 79 turbo has the air filter over the rad. I will remove soon and relocate it to a cooler place.

Keep the car tuned.

Exhaust to a free type or a 944.

remove excess weight in the car.

Clean fuel filter or change. I have carbs so I can see the silt in the glass.

I also have a cam gear adjuster. [dam getting old can't remember the name of it.]

Inflate tires to proper lbs. I usually go about 2 lbs higher.

A gallon of water weighs about 8 lbs. So you guys with the large windshield washer remove some of the water in there.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

[ideola]

If you haven't already, you need to read this entire article:
http://www.geocities.com/the_924_site/Heavy1.html

It might cause you to rethink the time and effort you want to invest in this venture.
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erstwhile owner of just about every 924 variant ever made