Hi,

I would like to know how can I calculate values to put inside of smoke map.
The car its a peugeot 406 coupe 2.2 hdi. The AFR that i'm using is 14,5, but peugeot uses 15,1 (for better economy i think). I have already change X axis by calculating MaxIQ * AFR, but I dont know what values to put inside the table.

Can anyone help me? Is there a formule to calculate values of smoke map?

Best Regards,
Filipe

Smoke map is AFR - Air to Fuel Ratio.

You need to decide what AFR you like the engine to run at and then calculate the map.

In your case X (air flow) / Z (fuel in the map) = AFR

I think you may have to recalcualte your AFR values - Peugeot dont use 15:1 at all, that would smoke like a chimney :D Ful power is more likely 17.5:1 or 18:1. If you use 14:1 in your tune, you will have thick black smoke following you.

To work out AFR, convert the smoke map to mg (The map is mm3) and then divide by your airflow - This should give you the AFR ratio.

so can anyone give a example for a good tuned smokemap? like wich AFR you use in different rpm´s

It depends on each induvidual engine really. Most diesels cant really go below about 16.8 - 17:1 without producing smoke, so aim for figures around this if you dont mind some smoke.
If you want a perfectly clean tune, go a bit higher, about 17.5 - 18:1.

See the attached Excel sheet. You put in your values in the yellow section (mm3), it converts it to mg in the next table and the third table shows your AFR.

You'll need to make sure the axis (Airflow and RPM) are the same as your smoke map.

The values in this file are the ones I'musing in my tune, making just over 135bhp from a normal 2.0 HDi 110.

hi, i also made this excell sheet to calculate afr, the question was how the pro tuners chose the afr for different files, like on stock engine with 30% more power we dont need to mess a lot with afr, but if i want to chage the turbo and injectors for a 100% more power, and not to much smoke, i will need to make my own smoke map...btw im talking about TDI engines

Hmm, interesting thread.

In TunerPro, being so great and everything, you can now add per-column and per-row calculations.

I've just added in some variables and referenced the appropriate axis addresses so the smoke map is actually an AFR map.

Makes for interesting viewing seeing the shapes I've been tuning in the past now shown as AFR!


I'm quite low AFR at very low MAF values, say around 11-12, but then as soon as the turbo starts to spool I lean off quite a bit to 17-18:1 or so, and then as the turbo is spinning hard I start to dip again.
It seems counter-intuitive maybe but I guess the balance is getting the rise point just right, then the dip back into richer AFR is all about how much smoke you are happy with 'on boost' as it were.


Hmmm, interesting and cool :D

Dave

Dave, how much fuel are you outting in for 1 bar boost of the 90 HDi's? On my 110 I can get away with almost 70mm3 without seeing anysmoke in the rear view mirror on standard boost (Although I'm sure there is some if I looked properly). A small rise in boost to about 1.1 bar then clean it up to about 73 - 74mm3.

Of course it's not just boost, I've given it a bit of a rail pressure increase in the mid-range too, then when I hit 1350bar around 3k rpm I start to advance the timing.

I'm simply wondering if you see a variance from engine to engine on how much smoke they produce with the same fuelling numbers.

I'm not sure yet to be totally honest.

I try not to think in bars, but get the MAF values I want for the fuel I want to make the torque I want with an AFR that is acceptable hehe...

If the turbo needs to spin harder to then achieve those MAF values while logging on the fly, then you obviously request more boost at that point... or close the wastegate a bit tighter, or whatever you do to increase boost...
If you can't then you trim your acceptable AFR a bit... or trim your torque expectations at that point.

I'm not sure on rail pressure either really. Doesn't adding RP increase advance a bit any way?


Are you really getting 70mm3 on Peugeot Planet diagnostic readout, and it runs clean? What is the MAF value to allow 70mm3 at those rpm on your car? Also do you have your binary (ori) to check because I'm not sure what ECU hw/sw you have.


Dave

Of course I'm getting those fuel values you cheeky git :D ;) 72.5mm3 at 2500rpm then falling to 65mm3 for 4000rpm. Maf values are about 1050 - 1100mg around peak torque, falling to 850 - 900mg at peak power (Depending on weather conditions)

Smoke map calculated to give AFR of about 17.4 at 900mg, leaving standard values at lesser airflows. Essentially I have a standard feeling drive, until you floor it and have a nice hefty increase in power.

Cant complain at a 55mpg average out of a 406 estate ;)

Rail pressure increases advances the end of injection, so yes, almost like an advance in SOI. You can calculate it pretty easily with the duration map and a spreadsheet, I have a spreadhseet which calculates the end of injection and I then tune the rail pressure map and SOI map to get the EOI figures that I want.

Just had a (somewhat random) thought - I've seen quite a few videos on youtube of "badly" tuned 306/206 HDi's puffing out huge clouds of smoke about 3000rpm... I suspect this is because they havent realised the rail pressure map is 2D inverse. If you set the rail pressure map to Two Dimensional, make changes to the high IQ line through the rev range and then set the map to the correct 2D inverse view, you'll see a nice RP increase to about 3000rpm, then a huge drop in pressure...