The operation of a TDI

[prj]

3l

Now I know how you saved money for your Boxster!

[4WheelDrifter]

3l

Now I know how you saved money for your Boxster!

It's called offsetting. The Boxster is cheap to run after an S8. I can do <7L on a (boring) trip.

My brother's 1Z 80 is cheap to run too, when veg oil is 80p/litre. But with Mihnea's 130PS map, it eats front tyres.

It's a shame the 3L is PD in some ways. I haven't really got the space for making biodiesel.

Hang on a minute... Are we talking diesels on s2forum?

[prj]

Hang on a minute... Are we talking diesels on s2forum?

I've been driving a diesel for the past two weeks, since the RS4 is having some surgery, so yeah, what else can I do to keep myself entertained?

[4WheelDrifter]

I've been driving a diesel for the past two weeks, since the RS4 is having some surgery, so yeah, what else can I do to keep myself entertained?

(R)S car feel slow? Drive a diesel for a while then reassess.

[Sir Buff]

A really good read that laid down in easy to understand terms

Your content just gets better my friend

Can you do the same for the map in my t4 transporter?

cheers

rich

I can give you a file for a T4 with the AJT Motor if you want. But you have to do immo and checksum cause i don't know how ;-)
(perhaps prj can do it)

[prj]

Immo is an invasive procedure, soldering is needed.
Also, if you mean a tuned file - read the conclusion, better to check what is inside before writing it.

Actually once you learn and understand how things work, tuned files almost completely lose their value to you.

[Sir Buff]

Yes, it's a tuned file. You can look at it if you want. I use it in my T4 TDI for at least 60'000 km. It don't destroys motors ;-)
But it's from the bay, so i don't know if it's correctly tuned. I sent the original file and then received the tuned one from the "tuner".
No soldering was needed.

[prj]

Depends if ECU is pre-socketed or not.
Some are, others aren't. Don't know about the T4.

Files from eBay are not really credible though

[Sir Buff]

The ECU (EDC15) can be flashed over OBD.
Files from well known tuners are also not credible in some cases (unfortunately). :-(
So, it's difficult to proof the quality for final customers with no knowledge of chiptuning.

[prj]

Ah, if it's an EDC15, then yea, that can be flashed.

[javispa]

I read it before finding this thread here. It is very interesting, thanks for sharing it Dmitri
Cheers.

[prj]

Hehe, you are welcome. And thanks for your hospitality!

[quattro84]

I enjoyed reading it as well. Nice and easy in those days, far more complex nowadays (smoke fuel limiter <-> transient response <-> altitude)
Haven't you found any max fuel enrichment parameters? (most likely in mg/ms) Or is the MAF signal steady enough by itself as a control input?

[prj]

I enjoyed reading it as well. Nice and easy in those days, far more complex nowadays (smoke fuel limiter <-> transient response <-> altitude)
Haven't you found any max fuel enrichment parameters? (most likely in mg/ms) Or is the MAF signal steady enough by itself as a control input?

It only uses 3 maps basically.
Drivers wish -> Torque limiter -> Smoke limiter -> Engine.

Whichever contains the lowest value is used. It's crazy simple
(well plus warmup enrichment and some compensations of course)

Nowadays ECU's have torque management as well, for a smoother driving experience, but largely it is the same.

[quattro84]

Indeed, it uses multiple (~10 different) control modes which are switching based on presets and boundaries based on temp/pres/eff.
It uses an fuel quantity demand pased on pedal position and rpm. That fuel quantity is used as an scalar for the rest of the maps to have a similar power output between mappings at the same fuel quantity demanded (like you say, power output should never deviate between control modes. crictical for drivebility and fuel consumption. margins are very small between competitors) This is achieved by a so called Torque to fuel scaler for alignment.
This is only the basics fuel-based for steady state conditions...

Edit: It uses a fuel state govenor as well to dictate what the max fuel value may be. More variables and limiters, same operation as your Opel.