Tech Year and Fuel Injection

[roflsauruswrecks]

I'm currently attempting to create a BMW M20B25 replica, according to the year 1987 (my BMW's production year). However I noticed that the only fuel injection available is mechanical for that year, and electronic fuel injection does not surface until 1992. If I'm not mistaken my 1987 M20 engine is uses a Bosch Motronic EFI. And after some internet digging it looks like EFI tech arrived in the 50's. Is there a reason for the technology showing up late like that? Or am I mistaken?

(as my first post I gotta add: the game looks fantastic and I'm definitely psyched about official release! Keep up the awesome work!)

[Der Bayer]

Hi,

the year when some technology is available in the engine designer is considered to be the year, where it is common knowledge and available for all manufacturers and totally reliable. In the full game, you can unlock stuff earlier by doing research, the tech will be unreliable at first so it might be an expensive task to make it reliable. The BMW is, if it would appear in the campaign of the game, "ahead of it's time" compared to most of it's competitors. So it is totally ok to set the manufacture year silder to 1992 in this case.

[roflsauruswrecks]

Thanks for the reply and info, that makes sense

[oppositelock]

I understand the dev's logic behind the tech years, and in most instances they seem to have got it more or less right, but not with EFI. How many cars were still using carbs in 1992? None that I can can think of, at least in first world countries. EFI was pretty much ubiquitous by the mid 1980's. It really should be moved back by around a decade, imo.

[oldgreg]

I understand the dev's logic behind the tech years, and in most instances they seem to have got it more or less right, but not with EFI... It really should be moved back by around a decade, imo.

+1

Toyota had multi-point fuel injection on the 18-RE in 1974. Ahead of its time? Sure, but not 18 years ahead of its time. 8 years ahead of it's time sounds a lot more reasonable. SPFI should be ubiquitous tech (and crappy) in 1978, and MPFI should be ubiquitous (but expensive) circa 1982.

EDIT:

Upon further Goggle-ing: Electronic multi-point fuel injection has been available from a third party supplier (Bosch) since 1967. It was an option on the Volkswagen Type 3 beginning in 1968, the Porsche 911 in 1969, the Citroen DS in 1970, the Volvo 164 and Saab 99 in 1972, etc, etc. It was expensive and complicated at the time, but it was available to any automaker who wanted to use it.

[zeussy]

There were carb cars in 1991 still, such as a civic and corolla (end of their model life)

The electronic injection in the 70's is not the equivalent of modern ECU EFI systems. It is more of an analogue electronic equivalent to MFI. I do agree that the years SPFI and MPFI come in are a little late. MPFI should be around 1990 rather than 92, and SPFI around 1982 or similar.

In 1969 NASA was using 60% of all USA microchip production to manufacture the guidance computers for the apollo program, and the first commercial microprocessor came on the market in 1971. Hybrid Digital/Analogue ECU's were still popular in the mid 80's.

[SnipeUout]

A friend of mine once had an Isuzu pickup 1993 I believe, I had a 4 cyl with a 2 barrel carb on it.

I also want to say there were some others, I know of a late 80's jeep that had an electronically controlled carb.

[xABSOLUTIONx]

There were carb cars in 1991 still, such as a civic and corolla (end of their model life)

i can second the Civic, 1992-95 Civic 1.3 (D13B2) had an electronically controlled carb, and the engine is god awful

speaking of tech years, i do believe that you will be able to speed that up with research

[oppositelock]

Eh, I think you guys are missing the point of the carb comment. Whether it was 99% or 100% of cars built with EFI that year doesn't really matter.

[Stoerdienst81]

Hello

What is about mechanical multipoint injection like my 86 golf mk2 16v and a lot of other engines
I think this is a connection between carb and electronic multipoint injection
For further information look at k-jetronic and ke-jetronic

Greets from Germany

[Daffyflyer]

Well we already have mechanical injection

[Stoerdienst81]

In engine designer, I've only seen a mechanical single point injection, but no multipoint.
I think there will be a difference between those 2 mechanical injections.
The point is, that my real 1.8 16v from 1986 has a multipoint injection and over 100kw.

Greets

[pyrlix]

The Mech-Inj. ingame is a multipoint injection



Top is Mechnical Injection, bottom is single point injection.
The choice between single and throttle per cylinder is just the choice of the number of throttles, and not injectors

Greetz
Roland

[Juno8]

can I ask a dumb question what build of game are we on...B199 or B203?

[Stoerdienst81]

Okay

Thank you, my fault. I thought it was a single point injection, sorry.

Greets