Fuel injection or Carberation

[Eat-um-up]

Well I am kind of torn. As I have mentiond before my dells on my 914 have gone bad. I put a 2.0l in my 914 from a 79 bus. I am trying to determin just how much it would cost me to put an FI back on this thing. or else im just going to spend the 600 for new dells. I was thinking of putting the Fi that was on the engine (I have it all right down to the computer) but I noticed little things like Where am i going to put the throttle? it mounts the opposite way on a bus. The guy i take my car to be worked on says that the bus would have had a L-jetronic Fi that does not quite fit on a 914. How do i tell what kind of FI system I have? are there just a couple of parts i can buy to make it work? or would i be better off buying a whole FI setup? I have no idea how well the FI works. I have never tried to run the system i have. I have the system here and I would like to use it (or trade for another in alright shape + some $$ if needed) I just dont want to spend all that much for carbs if i can do the FI for less or about that cost.

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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[JP Noonan]

well, the 79 bus motor only has about 67-70 hp new. The L-jet that comes on it is tuned for the hydro cam and small valved heads it has. I don't think duel carbs will help much if any. I single carb that is tuned right will most likely be just as good. The pistons are also lower compression than the 914's so the only way to make that motor work really well is to put on 914 pistons and cylinders, 1.8L or 914 2.0L heads and ideally a proper cam.

See if you can simply turn the intake pleumn 180 degree to make it work.

[Eat-um-up]

I plan on rebuilding my old 1.7 to a 2055cc or somewhere arround a 2.8L. I have not yet decided. I will probly end up with a 2055 though. the bus thing was a temp. had no money, only 200 bucks, extreamly strong fresh rebuilt.... and a dead 1.7. You know how it goes

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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Jake Raby]

Without a doubt, build a 2270 beast, it is the best engine for a street driven 914, in all aspects of the desire..

[Dave at Pelican Parts]

The D-jet system uses a Manifold Pressure Sensor (MPS) as its primary indication of engine load. The MPS is a silvery hand-grenade-looking thing with a single vacuum hose fitting and a four-wire electrical connection.

The L-jet system uses an Air Flow Meter (AFM) as the primary indication of engine load. The AFM is a piece which bolts onto the air filter box, and has a single five-wire (I think) electrical connector on it. The AFM has a quarter-circle "bump-out" on one side.

For more info on the D-jet system than you ever wanted to know, check http://www.914fan.net/djet.html

I'm not sure of a similar site with L-jet info.

The 79 bus did originally come with L-jet.

--DD

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Pelican Parts 914 Tech Support

A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling

[Jim Smolka]

Since you are going to increase the displacement of your motor, the stock FI will have trouble working correctly. I recommend looking @ an aftermarket FI system.

[bowlsby]

Jake, can the DJet Fi be ajusted to work on the 2270? I'm drooling, but I like the Djet.

[pbanders]

Originally posted by bowlsby:
Jake, can the DJet Fi be ajusted to work on the 2270? I'm drooling, but I like the Djet.

I'll be interested in hearing Jack's answer, but if the stock cam is retained, 2270 should be possible with D-Jet. We have a guy here, Andy Joslin, who runs a 2.2 D-Jet in Auto-X. The only modification required was to readjust the MPS for proper part-load mixture.

Brad Anders

[pbanders]

Originally posted by Jim Smolka:
Since you are going to increase the displacement of your motor, the stock FI will have trouble working correctly. I recommend looking @ an aftermarket FI system.

Maybe yes, maybe no. The D-Jet system is adjustable for a fairly wide range of idle, part-load, and full-load mixture. Small increases in displacement are within the range of the system, even without resorting to kludges like jacking up the fuel pressure or adding ballast resistance to the CHT. The only aftermarket system I would recommend is one where the seller has already done the dyno time to develop the system parameter table for your specific engine configuration. Otherwise, the development of this table is a fairly sophisticated process that is generally difficult for the average garage mechanic.

D-Jet is probably the only FI system that was ever made that allows adjustment of the mixture at idle, part-load, and full-load with little more than a screwdriver and an A/F meter. The best way to do it is on a dyno, but it also can be done on the road.

Brad Anders

[Eat-um-up]

Originally posted by Jake Raby:
Without a doubt, build a 2270 beast, it is the best engine for a street driven 914, in all aspects of the desire..

Jake I have the original 1.7L long block still. is it possible to get you to build me a 2270 with my old engine?? I would realy like to keep the original #'s in the car



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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Eat-um-up]

Well Obviously i know Jack about FI. I took a couple of pictures of my Fi system and the two components i think you were talking about Dave. the air cleaner has a 7 pin connector and the little silver thing has a two pin connector on it. Im still lost. thanks for the help.



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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Dave at Pelican Parts]

The two components you have arrowed are the air flow meter ("one prong"), and the auxiliary air regulator ("two prong").

You have L-jet FI, there--just what a late Bus would have had.

--DD

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Pelican Parts 914 Tech Support

A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling

[Eat-um-up]

Thanks dave, now i just need to find a way to see if its any good and if it will work on a 2270cc. Are there any parts i need to toss and get diffrent to put this on my 914?

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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Eat-um-up]

does the relay board in the corner of the drivers side have to work for Fi?? Mine is mostly bypasses and ugly. I would die of shock if its any good



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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[pbanders]

Originally posted by Eat-um-up:
does the relay board in the corner of the drivers side have to work for Fi?? Mine is mostly bypasses and ugly. I would die of shock if its any good

Yes, the relay board manages the ECU and fuel pump power, as well as the heater blower and signal/power routing for a number of components.

Brad Anders

[Eat-um-up]

too bad it manages the ecu. I am using a differnt fuel pump.. its looking like i might as well buy those carberators



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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Dave at Pelican Parts]

Actually, it doesn't do those jobs on an L-jet car. The "double relay" that hangs off of the battery tray (on a 914) does them.

The L-jet FI connects to the relay board in two places: It plus into one prong of the four-pole connector on the left-rear, which tells it when the starter motor is cranking. And it also plugs into the 12-pole connector at the right-rear, which sends the power to the fuel pump.

--DD

[pbanders]

Whoops, sorry. I've got D-Jet myopia these days . Dave's right, L-Jet and D-Jet relay board functions are different.

Brad Anders

[Eat-um-up]

So lets see if I have got this right. Since my control Bord is shot... and I am useing a aftermarket fuel pump (witch i would rather leave connected the way it is...allways on) I sould still be able to function with the FI. the only other computer like thing i have is the silver box i ripped out of the bus whe i got the FI.


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Sweet Blue 72' 914
Check it out at
http://www.geocities.com/eat_um_up/914.html

[Joe Bob]

Ummm, the fuel pump for the carbs prolly runs at 4-5 psi. Not nearly enough for FI.