Evening all,

So I am just about to change my exhaust on my Saph which is a 4x4 with 2wd conversion. The current system is a 2wd with a lambda boss welded on the down pipe.

The system which will replace it is a mongoose 4wd full system which I noticed tonight has no lambda boss. Not a big deal - will get one fitted prior to going on...in fact was going to install a second for AFR metering
....... but got me thinking:

1. Suprised being a 4x4 system that the Mongoose doesnt have the lambda boss installed
2. Pretty sure my car had a lambda installed from factory being a 1992??
3. With my car having a lambda, does this mean I have closed loop? How would I otherwise tell if I have this feature??
4. Back to my original plan - installing the additional boss, where is best to have this done??

Cheers
Huw

 

Originally on the 4x4 Greentop engines, the lambda boss was integrated into the turbo housing.

Best place to install it now would be around 2" to 3" back from the flange where the downpipe meets the turbo as it will be in direct exhaust gas flow there and not catch on the heat shield if you still have it.

 

Brill - thats exactly where it is on the system thats being removed

Any ideas on the other questions?
Cheers
Huw

 

2. Yes.
3. Yes, if you have the factory chip. With 3rd parties all bets are off, and keep in mind that closed-loop with on/off sensors only works at idle and when cruising. The ECU runs in open loop at high load.