Lambda probes. How close can they be to the exhaust port ??

mgbv8 · Post by **mgbv8** » Fri Nov 15, 2013 9:29 pm

As per the title. How close can i fit my probes to the exhaust ports??

I'm going to relocate my two probes while testing the zoomies and I have the choice of fitting them between 5" and 20" from the exhaust ports.

The blurb on the probes says operating temp 930C and max temp 1030C.

I've never measured EGTs on the Rover engine when racing. And I dont want to knack anything. EGT on nitrous should not really increase much. But I'm running nitrous on top of boost as well.

stevieturbo · Post by **stevieturbo** » Fri Nov 15, 2013 10:53 pm

generally you dont want to heat the sensor more than around 750degC

So if you insist on putting them close to the ports...be prepared for the sensor not lasting long, and possibly less accurate.

It would be easier to leave the lambda sensor further out, and monitor EGT's on all cylinders for fine tuning.
One lambda per bank, and 8 x EGT's

mgbv8 · Post by **mgbv8** » Sat Nov 16, 2013 8:24 pm

Sorry Stevie
I didnt make myself clear.

I'm not looking to log EGT's at the moment. I'm just wanting to re fit the lambda's where they will work but not get fried.

If I can keep them within say 6" of the exhaust ports they will still be under the bonnet when the zoomies are fitted.

Perry

stevieturbo · Post by **stevieturbo** » Sat Nov 16, 2013 8:28 pm

http://www.gb-ent.com/cars/index.php/el ... ender.html

DaveEFI · Post by **DaveEFI** » Sat Nov 16, 2013 11:31 pm

mgbv8 wrote:Sorry Stevie
I didnt make myself clear.

I'm not looking to log EGT's at the moment. I'm just wanting to re fit the lambda's where they will work but not get fried.

If I can keep them within say 6" of the exhaust ports they will still be under the bonnet when the zoomies are fitted.

Perry

Are you talking narrow or wideband?

mgbv8 · Post by **mgbv8** » Sun Nov 17, 2013 7:22 pm

DaveEFI wrote:
mgbv8 wrote:Sorry Stevie
I didnt make myself clear.

I'm not looking to log EGT's at the moment. I'm just wanting to re fit the lambda's where they will work but not get fried.

If I can keep them within say 6" of the exhaust ports they will still be under the bonnet when the zoomies are fitted.

Perry
Are you talking narrow or wideband?

Wideband Dave. I think they are Bosch probes on my Zeitronix systems

DaveEFI · Post by **DaveEFI** » Sun Nov 17, 2013 11:23 pm

ISTR wideband types are less tolerant of high temps than narrowband. Although that might have changed since I fitted mine.