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P924 · Joined: 14 May 2006 Posts: 57 Location: Belgium

Can anybody tell me what the specs of injectors of a 924 NA are?
I'm looking for bigger injectors, which will fit? (part number or something like that?)

Does it has any effect when you have a fuel pump of a 911 on your 924 ? Mine has one, in combination with bigger injectors it should gain some power, or not?
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924 1981
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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

as far as i know the 911,924,944,931 pumps are identical.

i have no ideea if bigger injectors can give you more power...but i think a new pump...new injectors and AT spec CIS can restore some of the 125 HP your car had when it was new. i'm doing the same with mine...i got new injectors....and i'm getting a new pump.

Anyway...if you want bigger injectors...try the 931 ones...they flow more.
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P924 · Joined: 14 May 2006 Posts: 57 Location: Belgium

Smoothie · Posted: Mon Oct 09, 2006 1:03 am Post subject:

New injectors can help (if the spray pattern on the old ones is bad), but a change to higher capacity injectors alone won't make a difference. You'd need to start with increasing the engines' breathing with supercharging, turbocharging, head with bigger valves, whatever.. Once you have a need for higher capacity injectors because of another upgrade - that's when you go for them.

Personally, I like the idea of air shrouded injectors, but I don't think anyone here's tried them. They improve atomization by introducing some intake air right at the tip of the injectors - benefits are increased power, smoother running and lower emissions. They were introduced just a couple years after the 924 (sometime around '84-'85 I think). I know some Audi's got them. The head would have to come off for some machining though because the tip of the injectors is wider.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

One interesting thing I read... I think it is in the indian red article... The stock fuel system was kept but they "increased the fuel pressure". So how does one go about doing this?

Oh and the 931 injectors are not a simple drop in replacement for the NA 924s. I have a set of the 931 injectors I never used. Add those to the list of parts I have for sale or trade. Also have a 931 intake manifold.

Anyway... does anyone know how to boost the fuel pressure? My 1982 has a new fuel pump and next are the injectors... if I ever get any money.

Thanks
Eric
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1992 968
2003 C4S
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Smoothie · Posted: Wed Oct 11, 2006 1:35 am Post subject:

Yeah the 924NA injectors are push-in while the 931's are screw-in. -So you'd have to also replace the injector holders.

Fuel pressure is regulated by the fuel pressure regulator that's built into the fuel distributor, so I'd imagine they changed the shimming and/or springage there to increase fp.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Tigger937 · Posted: Wed Oct 11, 2006 2:12 pm Post subject:

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Well I recently tested them all and none of them are leaking. One has a slightly irregular spray pattern and this is why I decided to just replace them all when I can get some money together.

But good advice thanks

Eric
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
Drive Fast!