update on exhaust issues... can anyone help? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

CJ_Boxster · 04-30-2008, 01:44 PM

Quote:

Originally Posted by tholyoak

There are actually a few 'ROW' programs, but I assume the one you are interested in, is the one that doesn't use post cat sensors. This obviously only use pre-cat sensors to control the mixture, ignores the need to depress the clutch to start the car, doesn't use the air pump for cold starts. Also it is virtually impossible to get a CEL as the tolerances are much greater on the ROW program. Those are the differences off the top of my head.

In earlier Porsches, the engines were higher compression and used higher octane in europe and thus used a more aggressive map (timing) than the USA/Canada program. Therefore a performance advantage was gained. This is no longer true, at least on the Boxster.

-Todd

I see, thanks for the info Todd!

CJ_Boxster · 04-30-2008, 02:04 PM

I found a guy that can do the flash here in So cal. PM me if you want contact info.

mn box s · 05-01-2008, 04:38 AM

Well I found that GIAC won't delete the cats but I have tracked down someone from Motronic that said they can set the car up with a race program that does delete the 02s and will give some performance gains at least to accommodate my upgrades and program set up for nitrous. He will probably getting back to me today. Ill update you on what he has to say.

blue2000s · 05-01-2008, 06:02 AM

Quote:

Originally Posted by mn box s

Well I found that GIAC won't delete the cats but I have tracked down someone from Motronic that said they can set the car up with a race program that does delete the 02s and will give some performance gains at least to accommodate my upgrades and program set up for nitrous. He will probably getting back to me today. Ill update you on what he has to say.

I'm going to predict that it will be cheaper just to put the cats back on than that ECU reflash.

mn box s · 05-01-2008, 04:38 PM

Ok enough already! I'm not a quitter nor am I a stand by and watch my mechanic kind of guy. I'm on this forum to get advise/ help with the 3.2L Boxster as I've only owned one so far and haven't even had to take the motor out yet. There are however many on this site that have. YES it WOULD be easier to put the cats back on YES it would be CHEAPER too. I don't give a poop about that. I am interested in making more power out of what little room we all have to play with. If I have to be the pioneer that figures things out so be it. Where the hell would you be with out people like me anyway? If you don't want to help a fellow Box owner figure out a different way, fine, but don't post the obvious just to get in your .02. To the rest of you that are actually helping thank you very much!

Topless · 05-01-2008, 07:27 PM

Quote:

Originally Posted by mn box s

Ok enough already! I'm not a quitter nor am I a stand by and watch my mechanic kind of guy. I'm on this forum to get advise/ help with the 3.2L Boxster as I've only owned one so far and haven't even had to take the motor out yet. There are however many on this site that have. YES it WOULD be easier to put the cats back on YES it would be CHEAPER too. I don't give a poop about that. I am interested in making more power out of what little room we all have to play with. If I have to be the pioneer that figures things out so be it. Where the hell would you be with out people like me anyway? If you don't want to help a fellow Box owner figure out a different way, fine, but don't post the obvious just to get in your .02. To the rest of you that are actually helping thank you very much!

Then you will need o2 sensors in place and working or your ECU won't know what to do. Without o2 sensors your car will go into limp mode and run lousy. Throw away the cheaters and ask edevelin how he resolved this issue. I think it took several months of trial and error but he did get it resolved. Good luck.

No reason to get hostile here. Everyone has a right to have an opinion even if it is different than yours. Others will surely read this thread and find interest in both views. Maybe we can all learn something about these cars.

edevlin · 05-02-2008, 05:24 AM

"Throw away the cheaters and ask edevelin how he resolved this issue. I think it took several months of trial and error but he did get it resolved. Good luck."

Try six months or so. I started out with a stock 2.7L Boxster and first put in a cold air intake and an Autothority chip and and the car was running great, no cel's. I decided to add headers and 100-cell cats and 4 new factory oxygen sensors to the car, and that is when the CEL's started up.

We played with extending the cables to the rear oxygen sensors, moved the sensors deeper into and out of the exhasut stream, moved sensor bungs along the exhaust stream, and more.

Ended up replacing 3 of the new oxygen sensors, both cats and as a final measure slightly reprogramming the threshold for triggering the oxygen sensor CEL in the ECU. The whole time the car was running great, it just kept giving CEL's. Even after all the hassle and expense, I still marvel at these engines, my little 2.7L just humms and last week it put out 210 hp to the wheels with 100-octane fuel, great fun

Ed

:dance:

blue2000s · 05-02-2008, 05:44 AM

Quote:

Originally Posted by mn box s

Ok enough already! I'm not a quitter nor am I a stand by and watch my mechanic kind of guy. I'm on this forum to get advise/ help with the 3.2L Boxster as I've only owned one so far and haven't even had to take the motor out yet. There are however many on this site that have. YES it WOULD be easier to put the cats back on YES it would be CHEAPER too. I don't give a poop about that. I am interested in making more power out of what little room we all have to play with. If I have to be the pioneer that figures things out so be it. Where the hell would you be with out people like me anyway? If you don't want to help a fellow Box owner figure out a different way, fine, but don't post the obvious just to get in your .02. To the rest of you that are actually helping thank you very much!

Pioneer, good one. Maybe you should calm down a little.

mn box s · 05-02-2008, 06:29 AM

calm here, not trying to be a dick, another .02 I see blue2000s...

Any way thanks edevlin I also tried extending my 02s and putting them farther down the pipes. So you are saying put the 02s back in the stream up front? Edevlin did you have a wandering idle?

I would also like to add to the people who don't seem to understand why so much work to stay this way. I have absolutely NO resonance at ANY rpm! also can barley here the exhaust with the windows up unless really on it.(hard top) From out side though it is a beast, plain and simple. One last thing it makes whopping power over having cats. I have not dynoed yet but by seat of pants and runs against a testing car gave me 4 car lengths 60-100 mph. I will say I'd bet I might have lost a little bottom end before 4k rpm.

Testing car 03' M3 with exhaust. Before the exhaust and intake he dissapeared into the horizon. After intake, and exhaust (M3 was in sight!) headers (8 car lenthes!) test pipes and no cats ( 3-4 car lengths back and locked up!) I'm hoping after re-programming that I'm even. Who here can take an M3 with exhaust? What have you done? Sorry about the long post.