Early EURO 930 SMOG System?

[991gts6s]

I have a 1977 ROW 930 that was officially imported and got the whole USA treatment done in the 80's ... But is the smog system installed for the USA import or did it come with the ROW models as well?

bringing it back to euro spec restore.

[ChrisD87]

My 76 had no thermal reactors but it did have the air pump

[lee88]

I have a '77 ROW (German delivered) 930, indeed no thermal reactors.

My understanding from the Snodgrass 3.0 Turbo book is that there were three components to the system to comply with North America (possibly also Japan) emissions regs: the exhaust gas recirculation (EGR) system, the secondary air injection pump, and then the thermal reactors. I believe the first two were fitted to all cars and in fact after they designed the system Porsche engineers discovered the secondary air pump actually improved boost pressure and torque slightly <3K RPM. The thermal reactors were fitted for US cars but not ROW.

So would make sense for the SAI pump and EGR to be in place but the thermal reactors definitely wouldn't be. Also as you probably know the exhaust routing is slightly different in the ROW cars because of the lack of thermal reactors. The heat exchangers are different since there's no outlet for thermal reactors and there's a cross pipe that routes exhaust to the wastegate & turbo.

[RarlyL8]

What is the engine type number? 930/??

[991gts6s]

thanks Guys.. It is a 930/52 677xxxx engine..
it does have the Euro exhaust with no thermal rectors .. just the normal J pipe muffler wastegate.