What is the difference in the APR programing on stage1 and stage2+ software?

[dubbed_monk]

Thanks

[StillclaimngDP]

Thanks

Good question. After having an 01 and 01.5 B5 S4 both with GIAC chips, I just got my first APR with EMCS on my latest car, a 2001.5 S4 Avant. I just picked up the car Saturday and Marc had the ECU to my by Monday at a smoking price (his email is [email protected]) ...I like being able to switch programs with gas prices where they are I know that much ;) I would be interested to know more about the program changes, apparently the main difference between stock and 91/93 performance maps other than the obvious boost increase is just timing adjustment.

[ThirdStrike]

more boost, slightly more timing, 2+ is made for cars with gutted primary cats.

[KryptoniK01]

more boost, slightly more timing

Is there more boost and timing for sure? That would be great if that's the case. I was under the impression the only difference was the coding out of the rear o2's.

[ThirdStrike]

2+ is for deleted/gutted cats so yes it negates the secondary o2's so you dont get cels.
its an overall more aggressive tune for cars with less back pressure on the turbos, so yes im sure. more boost, more timing.

[dubbed_monk]

I'm currently debating if it's worth the drive to Waterfest to have the car upgraded from my stage1 to stage2+. Since i would have to cancel my orginal engagement.
If the only difference is a rewrite to rid the CEL due to no cats, then it might not be worth the time. I've solved the cel light issue with a extended o2 bung.

My car is a 01.5 s4 with upgraded ic, labree downpipe & test pipe mated to a uuc vm3 exhaust. I was hoping the tuning for the stage2+ programing was a little more aggresive to take advantage of these mods.

[ThirdStrike]

My car is a 01.5 s4 with upgraded ic, labree downpipe & test pipe mated to a uuc vm3 exhaust. I was hoping the tuning for the stage2+ programing was a little more aggresive to take advantage of these mods.

it will be more aggressive, and being that it should be free its worth it. u can lemiwinks your timing and fueling but you cant increase boost without v-tune. and afaik apr doesnt have v-tune for our cars.

[1997gtx]

As far as I knew, the APR Stage 2+ only 'removed the CEL.' And, for that matter, it doesn't even 'remove' the cell, it just programs the chip to not look for that sensor.

The basic APR programming is enough for the computer to learn the mods you have.

Meaning if you are running 17psi before the Stage 2 tune, you're still going to run the same amount of boost and power.

The ECU is smart enough to note the changes and give you the power.

If you have removed the CEL yourself, then you should be fine.

At least that's what i've been told.
--Adam

[2ndEngineS4]

^^ding ding. we have a winner. 2+ codes out the primary O2's. Nothing more. It's also called "Stage I with downpipe program" by APR.

[jasonsrt4]

I think you mean codes out the secondary O2's.

[Jayco88]

I just got the APR stage II software a couple of weeks ago. And I was told that the only thing it does is tells the secondary o2 sensors to expect a greater flow. So you wont get a cel when running the car with no precats.

[dubbed_monk]

Just a follow-up for those interested.
I decided to run to waterfest for the software update to stage2+.
My orginal stage1 programs was done about 6yrs ago, so i'm not sure if APR has done any improvements to the tune since then.
I'm sure they must have done a little fine tuning here and there to the software from 6yrs ago.
Anyways, after the update to stage2+ i did notice they the overall power delivery/boost came on smoother than before. Other than that not sure if it's a more agressive tune or not, since i don't have a before and after dyno.
I asked the guys at the apr booth if they knew what the difference was between the 2 tunes, but no one at the time could tell me.
Well all and all it was worth the trip to the show, just to have everything done on the spot, also picked up the 100oct program.
Now i need to find a local spot for some 100oct, that hasn't been sitting there for a longtime.

If anyone know of any good stations that have fresh 100oct in the tri-state area let me know.
Thanks.

[1997gtx]

^ Easiest way to 100octane is with W/M =)

[s4quattro187]

Just a follow-up for those interested.
I decided to run to waterfest for the software update to stage2+.
My orginal stage1 programs was done about 6yrs ago, so i'm not sure if APR has done any improvements to the tune since then.
I'm sure they must have done a little fine tuning here and there to the software from 6yrs ago.
Anyways, after the update to stage2+ i did notice they the overall power delivery/boost came on smoother than before. Other than that not sure if it's a more agressive tune or not, since i don't have a before and after dyno.
I asked the guys at the apr booth if they knew what the difference was between the 2 tunes, but no one at the time could tell me.
Well all and all it was worth the trip to the show, just to have everything done on the spot, also picked up the 100oct program.
Now i need to find a local spot for some 100oct, that hasn't been sitting there for a longtime.

If anyone know of any good stations that have fresh 100oct in the tri-state area let me know.
Thanks.

sunday I dyno'd 272.9 hp 367 tq with stage 1 APR 93 oct program stage 2++. Today tuesday I took the car to get the stage 2+ update, I noticed alot quicker psi spike and its boosting a pound or 2 higher. I also changed my coolant sensor because it was going bad, going from normal temp to Cold while driving. I herd faulty coolant sensors cause Lean/Rich A/F In my case on the dyno it was running really rich at 5,500 RPM. Now I just need to take out my o2 sensor foulers. Plan to dyno the car again and if im not getting different numbers i'll look into new EGT's and N75.