Lambda sensor placement for MS

[jamesc]

Hi chaps,

Slowing working on my 325 getting all the MS bits together... one of the main problems I have is not having a lambda sensor fitting on my exhaust. Its a fritz 6 branch (I believe, one of the original 1st ever 6 branch group buys), which is basically 2 seperate systems, so not sure where to put the sensor? Do I need to try and join the pipes?

Cheers,
James

[stonesie]

Is there a crossover under the car? or would that be too far back?

Im wanting to know too for when i convert mine to LPG soon, hopefully this month.

[Brianmoooore]

Fitting it in one pipe only should be good enough. Whatever is happening in three cylinders should be happening in the other three as well.

[e30_Turbo]

Try get into number 6 runner, purley as it's the hottest and the first to blow, I can prove this about 5 times over

While your there fit a boss for a EGT gauge into number 6 too, that's all you will need to really fine tune it.....

EGT's are one toy I'll add over the winter when the new manifold is eventually welded up.

HTH, Mark.

[FlappySocks]

Did mine last weekend.


This was my old Sport. (lots of splatter!)

[e30_Turbo]

Don't fit them at any less than 9 or 3 o'clock, manual says something like 10 to 2!

[jamesc]

So basically somewhere in the upper half of the pipe is ok?

[hoshy]

What's the benefit of EGT? Allow you to get better spark tuning?

[FlappySocks]

As fozzymonster says. 10 to 2 is best. Not below 9 or 3. Its so that the sensor tip is not submerged in water left by condensation. Bit tricky to get it 10 to 2 on a standard exhaust.

[Gunni]

What's the benefit of EGT? Allow you to get better spark tuning?

It allows you to monitor the condition of the engine at the current state.
When something might fail you´ll see different EGT but might see same boost and same AFR. So it´s to help you notice problems.

EGT sensors are SLOW so they can´t be used in sweeping action only steady state tuning and even then it´s dangerous to keep a hard boosted engine at full chat at one rpm.

[hoshy]

What's the benefit of EGT? Allow you to get better spark tuning?

It allows you to monitor the condition of the engine at the current state.
When something might fail you´ll see different EGT but might see same boost and same AFR. So it´s to help you notice problems.

EGT sensors are SLOW so they can´t be used in sweeping action only steady state tuning and even then it´s dangerous to keep a hard boosted engine at full chat at one rpm.

Interesting - cheers Gunni.

Sorry for the thread spam