 Druk or Luft?, Which is the better Jetronic D or L ? |
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| daveyboybadion |
 Mar 19 2007, 09:18 PM
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#1
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Member  Group: Members Posts: 108 Joined: 19-January 06 From: Seattle, WA Member No.: 5,437 Region Association: Pacific Northwest  |
I have a 1.7 D-jet that needs work. I just bought a 1.8 L-jet to drop in for the time being. Is it desirable or even practical to modify the 1.8 to use the D-jet. In the same vein, I have also have a CIS 928 that I bought a 4 cam elctronically injected engine for, just because I will be able to tune it with a laptop. I'm not a big fan of that air meter thang. (IMG:style_emoticons/default/confused24.gif)
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| bd1308 |
Mar 19 2007, 09:40 PM
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#2
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
I like L-Jet, but im goign to Megasquirt. Make VERY VERY sure its for a 1.8 L -jet on a 914.....
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| davep |
Mar 19 2007, 09:44 PM
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#3
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914 Historian Group: Benefactors Posts: 5,151 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
L-jet is supposed to be technically better, and is the newer design. Just be sure the system is healthy.
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| bd1308 |
Mar 19 2007, 10:52 PM
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#4
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
In all reality, D-jet is a very good system for the time. I would prefer a 100% working system over anything else--BUT parts are getting really hard to find and are getting expensive.
That was what made L-Jet attractive. I chose (poorly) to make a 2.0L Bus L-jet system work on my 914 1.7L engine. After its warmed up, the part throttle is great, WOT is good but rich..... Cant lean out WOT far enough and still allow for decent mix at part throttle, although I think I can adjust the wiper position. But Megasquirt is great for its customizability. |
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| Bleyseng |
Mar 20 2007, 08:22 AM
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#5
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Inside the AFM is the large toothed wheel just turn it counterclock wise one notch and see how much it changes the mix.
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| pbanders |
Mar 20 2007, 11:47 AM
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#6
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Senior Member Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
Both the D-Jet and L-Jet systems on the 914 have there plusses and minuses. Regardless, both systems are suffering from an increasing lack of replacement, wearable parts, and ever-increasing expense. Inexpensive aftermarket injection such as Megasquirt is getting more attractive every day.
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| bd1308 |
Mar 20 2007, 01:43 PM
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#7
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
Please PLEASE dont adjust that toothed wheel
there is a screw in the wiper area, adjust that but very slightly. figure about 5-7% more or less per tooth. and around 1-3% with each turn of that idle adjust screw |
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| Brando |
Mar 20 2007, 07:38 PM
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#8
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
Britt, the proper way to adjust the wiper is both methods. The screw is a fine adjustment, the gear teeth is the coarse adjustment. Every AFS is supposed to be calibrated to the engine it is on. When setting proper mixture it's best to have a flexible gas analyzer or LM1 O2 sensor to know what mixture you have attained. The idle screw is just for idle.
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| bd1308 |
Mar 20 2007, 07:43 PM
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#9
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
I just dont encourage anyone to do what I did.
Its good, but not great after several months of tuning |
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| Brando |
Mar 20 2007, 07:48 PM
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#10
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
When you try to get a few AFC 914s and motronic 911s/944s to pass smog sometimes if the car has been 'tweaked' with before, it may be necessary to make coarse and fine adjustments to the air flow sensor to obtain proper mixture...
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