Installing AFR gauge on AUM (wideband/ME7.5)

[VAG-Slag]

As I'm getting in the final few pieces for my hybrid build my attention is drawn to monitoring, so I'm thinking oil pressure, AFR and possibly EGT gauges are in order...

On an AUM engine (which I understand is wideband?) do I need a second lambda in the down pipe for AFR or can I just tap into the original one?

If so what's the best way of doing this, at the ECU?

 

[<tuffty/>]

You will need a separate sensor

<tuffty/>

 

[VAG-Slag]

Not the answer I was hoping for, but thanks none the less! . .

I suppose I don't need EGT and AFR, one or the other will do... Can do AFR's on the liquid gauge anyway

 

[<tuffty/>]

EGT and AFR are not the same... both are preferable on a turbo car and having good AFR doesn't mean you have good EGTs...

I'd have both tbh

<tuffty/>

 

[VAG-Slag]

I know they're not the same... As I said though, can do AFR on liquid if I have to so maybe look into EGT

I'm sure you would tuffty, but the last thing I need right now is more things to spend money on sh!t is getting outa control over here! lol

 

[<tuffty/>]

The EGT gauge Prawn has works well and is reasonably priced... alternatively you could look at the VEMs as they do a gauge with AFR and EGT in one

<tuffty/>

 

[VAG-Slag]

Yea, BBT Dan does a reasonably priced EGT gauge... Only thing is I'm running a ported stock mani so will be difficult to weld anything onto. Was wondering if I'd get away with drilling and tapping into the top (bit bodge obvs!)

Just had a quick look at those VEMs dual gauges- Doesnt seem much cheaper and the gauge it's self looks hideous!

 

[<tuffty/>]

Or weld a boss to the DP... or onto the hotside of the turbo

<tuffty/>

 

[VAG-Slag]

Oh ok, always thought it had to be in the mani or turbo... Will have a go at sticking it on the DP, I assume as close to the turbo as possible is best?

 

[<tuffty/>]

<tuffty/>

 

[VAG-Slag]

Nice work... I think for the moment I'll just look into EGT and perhaps do something about AFR further down the line.

As always, thanks for your input mr tufft!

 

[badger5]

i would weld onto the k03 manifold as opposed tap as the manifolds less likely to crack from the differential expansions on welded than tapped into the manifold

or in downpipe and allow for its temp to be lower reading than if in collector/turbo area

 

[VAG-Slag]

Isn't welding solidly to cast a bit of a job in it's self? . . How much lower would you expect readings to be from the manifold compared to where tuffty's is?

This is the one I was talking about Dan does, not a bad price at all...
http://beachbuggyturbo.co.uk/egt-gauge-and-probe-168-p.asp

 

[badger5]

i've seen a temp gradient of 150+deg

 

[VAG-Slag]

i've seen a temp gradient of 150+deg

That is a notable difference. . .

If you were putting the probe in a k300 hybrid, were would you put it? . . Do you think it'll be ok in the elbow on the k03, about where this red dot is?

 

[badger5]

in inlet to turbo same as k04 has

 

[VAG-Slag]

oh right, think I'll try get in in the mani then... Mainly cos I don't fancy drilling/welding the turbo though!

Thanks!

 

[Mr Overboooost]

best place in my opinion for the EGT is in the manifold .
had one in my last car and it worked really well as always a good idea to keep an eye on the egt's

 

[superkarl]

The best place is the place the mapper knows about

 

[VAG-Slag]

I see what you're saying Karl but I'm not doing this for the mapper... I'm doing for me when I'm out on track and want to accurately monitor EGTs