Millers

[david7m]

Have being using the octane booster for a few tanks now, and the non chipped mode has noticably improved, especially pre turbo !

I was told by a few people the ecu would have to get used to the increased octane (optimax and millers)and adjust accordingly over time.

My car also has switchable apr chip. Will this confuse the ecu swicthing between modes? And every time I change mode will the ecu have to 're-educate' itself?

[Andiroo]

Hi David [img]images/graemlins/wink.gif[/img]

I think you will find the learning curve applies to all chipped/non-chipped ECU, especially utilising Motronic with a 1.55BAr MAF. With the APR setup I take it you will dial in more timing and/or boost which will instantly require more octane, which you have. As me on certain timing/boost settings you will notice that if you leave it on a certain performance setting it does seem to improve performance with time.

Please also bear in mind also that some performance improvements this month won't be anything to do with a learning curve - they may well be the cooler weather......

Andiroo

[david7m]

I think the chipped mode increases the boost from 7 psi to 1.2 bar, not sure about timing though.

If I leave on the higher boost mode, will this drastically reduce the life of the engine? I keep changing it back to low boost mode when in trafiic for work etc. thinking that it will help maintain the engines life, is this correct?

[Andiroo]

Seems the logical thing to do David [img]images/graemlins/wink.gif[/img]

Andiroo

[Dippy]

I think the chipped mode increases the boost from 7 psi to 1.2 bar, not sure about timing though.

If I leave on the higher boost mode, will this drastically reduce the life of the engine? I keep changing it back to low boost mode when in trafiic for work etc. thinking that it will help maintain the engines life, is this correct?

Alternatively you could get a boost guage and adopt some sort of self-control! Just because you can produce 1.2 bar, it doesn't mean you have to!

Reliability is a fickle thing, so I suggest that you don't worry about it too much. A stock car might fail quicker than yours - there is (bad) luck involved.

I would say that how often and how long you maintain high boost (and at what revs) has more affect on long-term reliability than absolute boost. And then again, your cool-down and more imortantly warm-up regimes are probably more significant than your driving habits!

1.2 bar is not particularly stressful for an S3 engine.

[david7m]

Don't think the boost is variable on the APR chip, I thought it was either standard or 1.2 bar?!?!?!?!?! Is this right?

That was my next question, warming up/down times!

I normally drive very steady for 15/20 mins from cold, then gradually built up to high revs and hard acceleration. On the way home I normally turn chip off and try to drive below 3,000 rpm for about 10 mins, then leave on drive running for approx 2 mins. Are these times long enough after the engine has being working hard???

[Riz_RS4]

I usually let the temp get to the nominal 90c before give any rev`s above 3000rpms.

I dont think leaving the car running for 2mins stood still is a good idea.... as it state`s in the manual that do not leave the car sitting still idling for long periods of time.

Riz [img]images/graemlins/s3addict.gif[/img]

[david7m]

I thought this would let the turbo wind down so the lack of oil pressure (when engine is turned off), doesn't grind the turbo to a halt after spinning so fast???

[Riz_RS4]

If you listen after you switch your engine off you should hear a pump sound..... this iirc is the oil pump for the turbo which stays on for about 3-5mins approx so really theres nothing to worry about.

Avoid quickly parking and switching the engine straight off... wait about 5-10seconds after the rev needle has idled..... then turn off.

That`s how i do it anyway.

Riz [img]images/graemlins/s3addict.gif[/img]

[Paul-RS]

If you listen after you switch your engine off you should hear a pump sound..... this iirc is the oil pump for the turbo which stays on for about 3-5mins approx so really theres nothing to worry about.

Avoid quickly parking and switching the engine straight off... wait about 5-10seconds after the rev needle has idled..... then turn off.

That`s how i do it anyway.

Riz [img]images/graemlins/s3addict.gif[/img]

its a water pump. oil just stops, when engine is turned off im afraid.

It pumps coolant around the turbo jacket

[Riz_RS4]

It pumps coolant around the turbo jacket

knew it pumped something to keep it good [img]images/graemlins/thumbs.gif[/img]

Riz [img]images/graemlins/29428-red4.gif[/img]

[Dippy]

Don't think the boost is variable on the APR chip, I thought it was either standard or 1.2 bar?!?!?!?!?! Is this right?

That was my next question, warming up/down times!

I normally drive very steady for 15/20 mins from cold, then gradually built up to high revs and hard acceleration. On the way home I normally turn chip off and try to drive below 3,000 rpm for about 10 mins, then leave on drive running for approx 2 mins. Are these times long enough after the engine has being working hard???

What I mean is that you don't have to be on full boost all the time. This is controlled by...the accelerator pedal! When you have a boost gauge you can see how much boost is being produced and can drive accordingly. This also helps during warm-up (where high boost at high revs is what you want to avoid).

As for your WUCD procedure - very good.

[Dippy]

If you listen after you switch your engine off you should hear a pump sound..... this iirc is the oil pump for the turbo which stays on for about 3-5mins approx so really theres nothing to worry about.

Audi must have done the S3 a bit better then, cos it only turns on in the S4 when the water is really hot, which is why I override it with my turbo timer.

Anyway, cool down is not so important for the S3 than the S4. The S4 has a history of K03 turbo failure whereas I've not heard any reports about S3 K04 turbo failure.

[david7m]

This is controlled by...the accelerator pedal!

At last, something simple, even I can understand that !!!

[img]images/graemlins/roflmao.gif[/img]