49 State 1983 911SC?

[porschedude996]

In 1983 was there 49 state and California cars? I see in a porsche factory parts catalog in the model descriptio they only list 1978 and 1979 as having (CAL). The 1980 thru 1983 don’t have a (CAL) version, only a
(USA) listing. My smog sticker on the Smog / Line Diagram says EPA. The Tag on the “B” pillar also has no mention of California version, only USEPA.

[FloydPink]

78 and 79 model years had California-specific versions with extra smog equipment (smog pump) and different engine codes. I believe that, starting in 1980, all 911s were sold with the same smog equipment across the country - no more CA-specific version.

[Coastr]

…said smog equipment was lambda box and catalytic converter for 80-83, right?

[garagejdm]

My 83 has option code 027 which is "Version for California"..

I believe the CA cars have different Lamda control boxes (per PET)
911-617-103-00 shows 1981>>
911-617-103-01 1981>>> CAL

Also the engine has a different designation... 93016 is CA specific. If you look in PET by engine designation you will see some things like the WUR are specific to 93016 engines.

My assumption is the Lamda probe box is designed to probably keep the engine running a bit more "lean" at startup, etc than 49 state cars to compensate and burn more fuel/create a cleaner burn. Guessing the WUR is calibrated to do the same.

[porschedude996]

Good points GarageJDM. I differ with the Lambda thoughts. My Bosch CIS books talk about tuning with the Lambda disconnected and then connecting to operate after tuning. That would make me think the Lamda is influencing after warm-up to trim during operation. There are two components present that are specifically used just for warm-up. One affects fuel pressure value to richen the mixture during warm-up, and the second to add more air during warm-up. Each has a thermo element to warm and change the state of the device.

Your point of the (027) option hits the other nail on head. Thanks!

[porschedude996]

I’ve been looking at emission stickers of any brand for a few hours on the web. I’m even seeing vehicle sticker examples within the US EPA Federal documents that show that “California” is currently acknowledged and may be listed in the motor vehicles manufacturer statements.

Meaning even 2022 stickers currently state if a car is Certified to be possibly sold new in California. My 2022 F150 has listed that it is California Compliant to (ULEV70 LDT). That must be a Released CARB Document.

My understanding now is that most or all vehicles “Cars & Light Trucks” either entering the US or cars made in the States have compliance with CARB and have California present on the Emission Placard. I think it would be foolish for a vehicle manufacturer to produce a 49 State vehicle today.

GarageJDM brings up a very good point above, Porsche had a California destination version list on the options on the Option Sticker under the hood “Frunk” as the California Version. (Option Code 027).

The takeaway from this discussion is that there were 49 state vehicles made by Porsche in 1983, possibly 1980-1983. To be sold new in California it would need to have Option 027.

[AndrewCologne]

Originally Posted by garagejdm

My assumption is the Lamda probe box is designed to probably keep the engine running a bit more "lean" at startup, etc than 49 state cars to compensate and burn more fuel/create a cleaner burn. Guessing the WUR is calibrated to do the same.

Originally Posted by porschedude996

Good points GarageJDM. I differ with the Lambda thoughts. My Bosch CIS books talk about tuning with the Lambda disconnected and then connecting to operate after tuning. That would make me think the Lamda is influencing after warm-up to trim during operation.

The ECU which will be fed by the signal of the OX sensor does not control the mixture at warmup but simply enrichens it a bit to 65%, where 50% would be the middle/normal state. After the temp switch on the right chain housing recognises an oil temp of 15 °C the regulation begins and the lambda control takes over where from then on the mixture will be kept to an optimal stoichometric state bsed on the signal of the OX sensor.
As 90% of driving will be at normal or even low load this is optimal for combustion, temperature, less residues and last but not least a far better mileage.
If you request high load and hit the gas by opening the throttle beyond 35° then also here the control will be passed by and a fixed enrichended mixture for accelerating will be present, ... also here 65% (where 50% would be normal).

Here's all you need to know about your Engine:
https://nineelevenheaven-wordpress-com.translate.goog/der-911-us-sc-3-0-motor-mit-g-kat/?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
(Translated via Google – translation on my side is in progress)

[porschedude996]

Thanks AndrewCologne, a very good read. Just when I thought I was starting to understanding the system, you show me the Clock Valve. Yikes!

[AndrewCologne]

I passed the german page through the google translator, thats why Taktventil (frequency valve) is translated wrong into clock valve.

[porschedude996]

Andrew, no problem. thanks for bringing the Taktventil into focus. In my reading prior to your webpage, I was only looking and seeing components that pertained to cold starting. I will get my head around this. Thanks for your help.

Originally Posted by AndrewCologne

I passed the german page through the google translator, thats why Taktventil (frequency valve) is translated wrong into clock valve.