CSI euro owners opinions?

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twistinglane

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There is an interesting current discussion of coupe performance on thread below. But mostly about carbureted cars. Would any owners of 3L d-jet cars be willing to share thoughts about performance and general satisfaction with that setup?
http://www.e9coupe.com/forum/showthread.php?t=14997

Asking this as would be E9er, seeing some original CSIs available...
 
CSi vs CS

Assuming identical engines including cam set up at their optimal specs, a fuel injected car will produce more power and use less gas doing it than a carbie. The factory performance numbers in BMW sales literature bears this out. Is this what you are asking?

I took a very well sorted weber downdraft and converted to L Jet and am slowly converting to b35 using a dyno set up at each stage. With no changes to the engine build other than the intake manifold, the EFI produces more power with less fuel at each evolution.

A well sorted L Jet is a relatively simple (not programable) but very reliable EFI that will start well, warm up consistently, idle smoothly, accelerate well to the limit of the engine build and cruise efficiently - what's not to love about that? One thing you will not get is that lovely snarl of the carb intake. I do miss that but not enough to go back.

HOWEVER, given the age of the cars and how many owners they have gone through you need to look at each car as an individual example and determine if it is at or near it's optimal spec. There are great carbed CS out there and really ****ty CSi - depends on how each car was/is maintained so don't assume anything based on badging.

My respectful and humble experience only,

Doug
 
D-jet vs carbed:

I have had and have cars with both setups and the carbed has more torque around 2000 rpm but the D-jet is more crisp and instant in its throttle response. There is nothing faster to react than an analogue/mechanical injection like the D-jet. It's also more powerful above 4.500 rpm but for everyday driving... it doesn't really matter that much - look for the best body structure and enjoy the engine - regardless which one you have.

Cheers
Anders
 
After 40+ years the D-Jet wiring harness gets brittle, a broken wire, weak connections can plague a CSi. Had to re-solder a bunch of connections and clean grounds. D-Jet is finicky, yet when it's sorted it works great.

Right know I love my CSi, it's been well sorted has good throttle response, pulls steady and strong and has become very reliable. It's not going to win many red light drag races, but that's not what a coupe is for.
 
First thing that reflects in my mind due to this question was when I was starting up my purchased csi for the first time. History was this csi had been sitting unused in a garage for the last 28 years. My first fare was when putting 12V into the car (fuses by fuses). The components in the injection unit could/would be bad due to aging. Wow! no short circuits! With the luck on my side I cranked the original but well refurbished M30. Wrooom! The old stove was starting up and directly adjusted to perfect idle rpm. Since that day I got the car to trust on. When important meetings or plane to catch I will always have my csi in the garage to reliable on when my daily driver stop working due to errors in the advanced inbuilt car processor (another brand from Germany :-) )
So as far to my experiences is that the Dinosaur Jet will not let you down :-)
 
Stefan said:
First thing that reflects in my mind due to this question was when I was starting up my purchased csi for the first time. History was this csi had been sitting unused in a garage for the last 28 years. My first fare was when putting 12V into the car (fuses by fuses). The components in the injection unit could/would be bad due to aging. Wow! no short circuits! With the luck on my side I cranked the original but well refurbished M30. Wrooom! The old stove was starting up and directly adjusted to perfect idle rpm. Since that day I got the car to trust on. When important meetings or plane to catch I will always have my csi in the garage to reliable on when my daily driver stop working due to errors in the advanced inbuilt car processor (another brand from Germany :-) )
So as far to my experiences is that the Dinosaur Jet will not let you down :-)
Click to expand...

+1 :-)
 
Keep in mind the djet connectors are available from rock auto and napa.
You will need lots of them......
 
Plus one.
I think there is a lot more variation among the carbed cars in terms of power delivery, since some have Webers, some have Zeniths, etc. My carbed car has more low end power too, compared with the Djet car. I prefer the Djet, but look for the best body you can find.
Scott


DerSchwede said:
D-jet vs carbed:

I have had and have cars with both setups and the carbed has more torque around 2000 rpm but the D-jet is more crisp and instant in its throttle response. There is nothing faster to react than an analogue/mechanical injection like the D-jet. It's also more powerful above 4.500 rpm but for everyday driving... it doesn't really matter that much - look for the best body structure and enjoy the engine - regardless which one you have.

Cheers
Anders
Click to expand...
 
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