APR stage II chip

**Jayco88** · 06-20-2008 06:59 PM

i searched! ok!? but i cant get a solid answer.

I got the 'APR stage I' flash a few months back, and the APR dealer that installed it said that whenever I decide to go stage II with a cat back exhaust he would upgrade/flash my ecu for free to the APR stage II software. Now my question is, what exactly does the APR stage II flash consist of?

I read that it disables the secondary O2 sensors (for piggies). what else does it do?

thanks in advance

**Jurjen** · 06-20-2008 07:40 PM

Im sure someone will correct me if Im wrong, but I pretty sure disabling the CEL from coming on is all that it does.

**AudiSportB5S4** · 06-20-2008 09:19 PM

it doesnt "disable the CEL" it just doesnt read the rear o2's. if you were to fully disable this cars CEL it would be like driving down the road with a bag over your head, i bet they used long life bulbs in that bitch!

**Jayco88** · 06-20-2008 10:00 PM

Originally Posted by AudiSportB5S4

it doesnt "disable the CEL" it just doesnt read the rear o2's. if you were to fully disable this cars CEL it would be like driving down the road with a bag over your head, i bet they used long life bulbs in that bitch!

Tell me about it.. I drove the car for 6 months without a working CEL light. didn't realize it wasn't working until recently. So I opened the cluster the other day and found a rubber plug covering the CEL light. I got so mad. Damn that previous owner, he was a russian mechanic and seemed pretty honest about the car.

So i vag'd the car, and the only DTC was for a faulty MAF, cleaned the shit out of it and cleared the code. CEL's gone

.....anyone else knows what the APR stage II software flash does? I'm only doing a catback for now, would I see any benefit?

**mholme** · 06-20-2008 10:12 PM

Originally Posted by Jurjen

Im sure someone will correct me if Im wrong, but I pretty sure disabling the CEL from coming on is all that it does.

That's stage II + code, for the downpipes/testpipes. It ignores the secondary O2 readings.

**obijohn22** · 06-21-2008 08:22 AM

Originally Posted by mholme

That's stage II + code, for the downpipes/testpipes. It ignores the secondary O2 readings.

+1

If you are not doing anything with your downpipes at this time. I see no benefit whatsoever.

**S4 John** · 06-21-2008 08:44 AM

Originally Posted by Jayco88

Tell me about it.. I drove the car for 6 months without a working CEL light. didn't realize it wasn't working until recently. So I opened the cluster the other day and found a rubber plug covering the CEL light. I got so mad. Damn that previous owner, he was a russian mechanic and seemed pretty honest about the car.

So i vag'd the car, and the only DTC was for a faulty MAF, cleaned the shit out of it and cleared the code. CEL's gone

.....anyone else knows what the APR stage II software flash does? I'm only doing a catback for now, would I see any benefit?

thats mad shaddy man.

**2kblacks4** · 06-21-2008 02:59 PM

I have the stg 2+ software and as stated above it just does not read the cel. There is no gains to be had by the chip.

Also apr will flash it on there for free, or they did for me.

**ThirdStrike** · 06-21-2008 04:41 PM

yes the 2+ file is for deleted cats. you must also delete your primaries with the 2+ file or it will over stress the turbos. i went from 2 to 2+ without deleting my primary cats and popped a perfectly good driverside k03

**Jayco88** · 06-21-2008 07:53 PM

Originally Posted by ThirdStrike

yes the 2+ file is for deleted cats. you must also delete your primaries with the 2+ file or it will over stress the turbos. i went from 2 to 2+ without deleting my primary cats and popped a perfectly good driverside k03

good to know. So I must first install downpipes/piggies then get stage 2+ software that ignores the rear oxygen sensors.. thanks guys, I have been enlightened.

**mholme** · 06-21-2008 08:20 PM

Originally Posted by ThirdStrike

yes the 2+ file is for deleted cats. you must also delete your primaries with the 2+ file or it will over stress the turbos. i went from 2 to 2+ without deleting my primary cats and popped a perfectly good driverside k03

How did it over stress the turbos? I would think if anything would over stress the turbos it would be the pre-cats since they sit like an inch away from the exhaust end of the turbos. I'm just curious as to how a software code that ignores secondary readings from O2 sensors could cause any more stress than just a "normal" chip. I'm running APR 93 with piggies and exhaust, so like I said, just curious about your experience