924Board.org

[Kenodog]

Holy friggin crap man that is clean. I've been looking under 924 hoods for over 20 years now and that still took me a few minutes to sort out stock vs. non stock parts.

Well done !!




Me
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[morghen]

I hope you dont mind i used your picture on the website

https://www.the924.com/?page2

[Legitimate Salvage]

I’m getting dangerously close to ordering one of these kits. I’m going to get my K-Jet in good fettle first.

My primary question is what (if any) modifications need to be made to the K-jet? Can it keep up with the supercharger air-flow? Are any adjustments to fueling necessary?

If these questions have been answered, just point me to it.

Thx!

[morghen]

The k-jet can just about keep up.
But i also developed a bolt on EFI kit for the 924SC and now developing it for the 931.
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https://www.the924.com

[Kenodog]

Yeah you are....and if you'd hurry the hell up we'd appreciate that ( :
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[morghen]

As much as i can brother. I’m excited and happy to do this but things have been busy and stressful around here for a bit.

I’m near to starting that 931, tried to crank it yesterday but seems the starter wiring is dead, so i need to have a look there next.
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https://www.the924.com

[Riggard]

Just came back from a 2000km trip to Germany, last time I went car was not supercharged, this time it was.

What a difference it makes! Especially in hilly areas (which we don't have in The Netherlands ) the supercharger provides a really nice push in the back. Also on the autobahn when you go like 140km/h the SC provides a very nice push/boost allowing easy acceleration and overtaking. Enjoyed driving this trip much more than the last time because of it. The power is very 'practical'.

No real issues with the kit, except that I blew of a hose in the ardennes, going 150km/h up a very long and steep hill, but that could well be because I hadn't re-tightened the hose. 1 minute with a screwdriver and it was fixed again; stayed put after that.

wrt. the question about the K-Jet, the only modification I did was to slightly lower the fuel pressure (using WUR) to make sure it's fuelled a bit richer. That's like a 10 minute adjustment (push out the center of the WUR a bit). But this also depends on your starting point, mine probably was already a bit lean to start.

[morghen]

Hey, you’re back from the trip!
Amazing!
Lets see some pictures or videos.
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https://www.the924.com

[Legitimate Salvage]

As tempting as the EFI upgrade is (and believe me, I'm tempted), My mantra for this car is "don't build it into something that it isn't." In short, I want to keep it as stock as possible with only few upgrades that enhance the enjoyment factor. That plan is covers going fore to aft on a search/destroy/replace every bit of rubber I can find, putting Billstein B6 on all four corners, wheel bearings on all 4 corners, getting the K-Jet dialed in, and finally installing the supercharger.

As a wise man once sang, "It's not a freeway bullet or a bug with monster wheels..."

[safe]

[Legitimate Salvage]

Only issues I’m having with my k-jet are hard starts (both cold and warm). It runs well otherwise.

My primary issue is financial. I can afford either the SC or the EFI… not both.

[barnwerks]

I agree with safe that the EFI should be done first.
If I understand your "mantra", a power adder like a supercharger really doesn't fit within the design parameters anyway.
Just think how much less embarrassing it will be at the cruise night / car show / whatever gathering, with all those people standing around your Porsche when it starts on a bump with EFI vs crankaty, crankaty, crankaty with CIS.

[safe]

[morghen]

I ran two cars with k-jet and supercharged for a good while, doing various tests with both of them, including high altitude tests, winter, hot summer..etc.
They both ran ok for my needs and for what i knew a 924 should be like, the 81 suffered from hot start issues and generally needed to run rich to avoid detonation and work fine, my 85 was almost perfect every time, not even having hard starts..but thats not everything.

When i switched to EFI i felt like the car runs cleaner and more consistent in all conditions and situations...allow me to explain.

For example, you go into a tight right hand corner, shift down into second gear and you plan to come out blazing, possibly sideways.
K-jet will sometimes hesitate a bit, sometimes even buckle down...depending on your tune and other factors.
There are other conditions/situations where you can really tell a difference.
Generally the EFI is more firm, more consistent and a bit faster if you take advantage of those differences.

If you can live with the k-jet and yours works as it should to keep the engine fed properly...you dont really need the EFI...but EFI is nicer in every way.
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https://www.the924.com

[safe]

Have you run a 924 NA with EFI?
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe