1983 Audi Quattro

[AndreyB]

That's a LH-Jetronic is it? What do we know about EFI conversions of these engines - are there any kids to make the conversion simpler?

https://github.com/rusefi/rusefi/wiki/Jetronic-Conversion

[mck1117]

No, that's K-Jetronic. LH-Jetronic = airmass hotwire. K-jetronic = mechanical MAF (!) that actuates valves directly that control fuel flow.

[SmartInCar]

Привет!
Парни, у меня есть наработки по таким машинам.

[AndreyB]

So https://kjetkillers.pl/en_US/p/Injection-set-piggyback-EFI-Audi-80-2.3-/73

[mck1117]

So https://kjetkillers.pl/en_US/p/Injection-set-piggyback-EFI-Audi-80-2.3-/73

Yeah.

[AndreyB]

This fancy vehicle has one or two 035905381a in stock form.

Stock injectors are like this http://www.sjmautotechnik.com/trouble_shooting/injector.html

image.png

Original constant flow injectors seems to be larger than modern injectors so the injector seat seems to have less material comparing with the custom replacement. 034133555A

image.png

[bill]

SAABs had the same mechanical bosch fuel injection setup... in the late 70's early 80's

[AndreyB]

@abricosvw has shared https://forums.quattroworld.com/s4s6/msgs/20986.phtml

image.png

[AndreyB]

Some pics "before" condition

[puff]

this might be too subjective, but I had driven three audi with atmosperic 5-cyl engines, which were basically similar: one was 2.0 (44) with k-jet, and the other two were 2.3 ex-ke-III-jet (c4) converted to electronic injection. no turbo. from my experience I would say, 2.0 had performed better: it was revving faster, it provided same power under load (despite smaller volume), and probably had better fuel efficiency. this could be attributed to poor tunes of the later two cars. but more likely, these were the benefits of continuos fuel injection with all the regulation done by fuel pressure.

PS during my years at the university we had a course of physics (just genereal overview of how research in physics affected computer science). Besides electronics and photonics, the same logics can be implemented with pneumatics. There I learned about the Russian jet fighter that was stolen by the test pilot who decided to escape to Japan. Japanese engineers obviosly were perplexed to find no electronic parts at all, with all the aircraft units being driven mechanically by compressed air.