nt

If you go under the hood when you turn the key to on after installing the ECU you'll hear the throttle body doing it's thing...so I think turning the key to on is probably the appropriate thing to do.

Regards,
James R.

99 1.8TMS (Brembo Rotors, Mintex Red Box, Bilstein Shocks, Neuspeed Sport Springs and Front Anti Sway Bar, APR 1.0 Bar ECU, K&N Filter, Remus Exhaust, Ronal R-28's 17" x 8.5", Euro Corners + Markers...tint all the way around and probably some other stuff I've missed.)

This is in the factory manual as well. Throttle adaptation will not be correct if this procedure is not used when using a new ECU. Adaptation may take an excessively long time or not ever adapt at all if you just let the engine run.

Brett
APR

Hi,

Don't get too worried.

There is a little bit of everything involved in adaptation as people are posting.

Yes, the car does SOME of its adaptation with Key On Engine Off (specifically throttle body adaptation- part of setting basic settings), but another part of adaptation is done during idle.

Most current Bosch Motronic management, in this case M5.9.2, use 2 types of memory for adaptation, volatile memory (like RAM on a PC), and non-volatile memory (AKA Flash - EEPROM, plus other minor memories, like a harddrive on a PC). The volatile memory loses its data when it loses power (eg: unplug the ECU from car). The non-volatile memory does not lose its data if it loses power. This is part of the ODBII standard. The feds. want it to remember emissions related issues, and in some cases warranty issues- like overrev.

Now back to adaptation. Turn the key on and it will write to some addresses. Until idle, the ECU will not write to other blocks in volatile memory, then to flash.

This is not VW/Audi information. This is Bosch information.

We are very familiar with these issues. For full race cars we 100% disable this for allowance of extreme parameters, so it will not try to adapt to safe limits or "clean emissions" settings. This requies knowing very well the addressing of the ECU databus. Racing has more of an emphasis on power than emissions or safety!

Hope this helps clarify this issue.

Bottom line make sure you never press the accelerator pedal when starting the car and you will be fine. Even an adapted ECU can have errors that require resetting the flash memory with a VAG to realign the t-body to ECU.

Garrett Lim
jglim@fast.net

The 180HP 1.8T has a slightly Larger Throttle Body and Air Mass Sensor,
Does This mean you can install one of these Throttle bodies on a 150HP motor/ECU and ECU will recalibrate at ignition on automatically, or does the ECU need to be reprogrammed?
Does the Same follow for a Larger Air Mass sensor?

HI Lucas,

you *should* be able to bolt it right up. All of our 1.8T chips all have the T-body fix in them by default (to prevent a nasty DTC). Our first chips were never street driven so we had this in there.. It has been left in the code.

If the signals are similar, both t-body and Mass air- no worries. odds are that it is a simple bolt on and rewire the harnesses. I have done this on many BMWs- they like them. But sorry they did not make ANY dyno power on the normally asirated cars, now turbo may be another thing. T-body does get full throttle faster. (here is where year 2000 Drive-by-wire is hot, we are speeding them up, really feels nice- no hardware needed.)

One can recalibrate the mass air if needed. if the signal is different. But this requires knowing a lot about the mass air and TPS (throttle position sensor) and how they communicate in the code. This not normally done by tuners on normal street chips. Most of the time this requires the car be local for custom calibration, even the Bosch teams send in the "specialists" to do cars in person. Theory is all nice but until it is tested it does not mean anything.

But i would still try it on your car, it is quite modified.

Garrett Lim
jglim@fast.net<ul><li><a href="www.giacusa.com">www.giacusa.com</a</li></ul>

So when are you going to come to Australia for a Visit?