wtf!!!!!!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners

SRQ Boxster · 11-28-2007, 09:23 AM

The CEL's can be eliminated in my application ('02 Boxster S) with a reprogramming of the ECU. Basically, you program it has as a Euro spec. car which is only looking for a signal from the front O2 sensor (on the first cat.) and not both front and rear sensors. This set of headers only has one O2 bung which is good for my application as I don't have to add one or block of an extra one.

Adam · 11-28-2007, 09:38 AM

So do these have the bung holes in them for the 2000+ cars? If they do what do the 97-99 guys do...plug them up? I've never seen a header that claims to fit 97-2004!

SRQ Boxster · 11-28-2007, 10:12 AM

The headers I received only have one O2 bung, it is located at the rear of the header near the collector.

SRQ Boxster · 12-03-2007, 06:19 AM

Performed base dyno runs over the weekend. Just a little background info. on my car. It's an '02 "S" with 17k miles, manual trans. Engine is stock with the exception of an EVO airbox. Dyno runs were performed on a Dynapack 3000. Three pulls were made and peak hp only averaged 180 rwhp @ 7,200rpm. I had expected see closer to 200 rwhp, even at a 20% power train loss. Headers should be installed and on the Dyno again today.....

blinkwatt · 12-03-2007, 07:07 AM

Quote:

Originally Posted by SRQ Boxster

Performed base dyno runs over the weekend. Just a little background info. on my car. It's an '02 "S" with 17k miles, manual trans. Engine is stock with the exception of an EVO airbox. Dyno runs were performed on a Dynapack 3000. Three pulls were made and peak hp only averaged 180 rwhp @ 7,200rpm. I had expected see closer to 200 rwhp, even at a 20% power train loss. Headers should be installed and on the Dyno again today.....

Your numbers seem very low for a S. Are you sure it's being dynoed correctly?

Here is a healthy S dyno chart. Stock & stock w/ evo intake set up.

SRQ Boxster · 12-03-2007, 07:24 AM

I agree, the HP numbers mine generated are low. I don't know why yet. The Dyno and the techs performing the runs do a great job so right now I'm at a loss. They called a few minutes ago to inform me the headers went on this morning without issue and will be on the Dyno again after lunch. I'll post some graphs when I have them.

porsche986spyder · 12-05-2007, 01:46 PM

Quote:

Originally Posted by SRQ Boxster

The headers I received only have one O2 bung, it is located at the rear of the header near the collector.

So where does the other sensor go? Does it just stay unpluged? Does that work? Do you just cut that other one off?

Seems like it should still used both O2 sensors. I ordered these headers and now I'm having second thoughts. They should utilize both sensors. Most other after market headers do.

Adam · 12-05-2007, 02:14 PM

Quote:

Originally Posted by porsche986spyder

So where does the other sensor go? Does it just stay unpluged? Does that work? Do you just cut that other one off?

Seems like it should still used both O2 sensors. I ordered these headers and now I'm having second thoughts. They should utilize both sensors. Most other after market headers do.

Well, the 02 sensors have a wire with a connector at the end so there would be no cutting involved. Maybe just unplug them and reprogram the ECU? SRQ will have to tell us I guess.

porsche986spyder · 12-05-2007, 02:22 PM

What about splicing the 2nd one into the first O2 sensor wires being used? My Volkswagen friend said they do that sometimes. I wonder if that would be better than leaving it completely unplugged.

porsche986spyder · 12-11-2007, 09:48 AM

Is it possible to do this? Since it only has 1 bung hole for the O2 sensor. Or do you just leave on side disconnected? How hard would it be to add the missing bung hole?

JaysPcar · 12-03-2007, 09:59 PM

Quote:

Originally Posted by SRQ Boxster

The CEL's can be eliminated in my application ('02 Boxster S) with a reprogramming of the ECU. Basically, you program it has as a Euro spec. car which is only looking for a signal from the front O2 sensor (on the first cat.) and not both front and rear sensors. This set of headers only has one O2 bung which is good for my application as I don't have to add one or block of an extra one.

I'm confused

. I have a 2002 S as well and I have a fore and aft O2 sensor on the pre-cats.

SRQ, why does your S only have one on each side???

SRQ Boxster · 12-04-2007, 04:11 AM

[QUOTE]SRQ, why does your S only have one on each side???

My car does use four O2 sensors. With this header set I am only going to utilize two of them. Programming the ECU as an ROW car will eliminate the CEL for the missing sensors.

SRQ Boxster · 12-04-2007, 05:51 AM

Picked up my car last night. Headers went on without any fitment issues, ECU was programmed for single use O2 application and Dynos were run. MY max rwhp without these headers was 182.5rwhp. and 199.6rwhp with headers for an increase of 17.1 rwhp. The engine now has a slightly more aggresive exhaust note and it passes the butt dyno test. So far I am quite pleased with these headers. The quality, construction and fitment is on par with any other aftermarket header I have seen and they did have a measurable performance gain. I'll still post some graphs when time permits.

shaman1204 · 12-04-2007, 11:49 AM

I've been following this thread and am considering doing this. SRQ Boxster, who reprogrammed the ECU and what was the cost of installation and reprogramming? If these work out, it sounds like a win/win/win situation. More horsepower, aggressive exhaust note and two less o2 sensors to worry about replacing down the line.

SRQ Boxster · 12-04-2007, 12:07 PM

The work was performed by Renn Haus here in Sarasota. Total for install and ECU programming was $300.00.

shaman1204 · 12-04-2007, 12:22 PM

Thanks, I think I am going to take the plunge. Do you know if there any issues with reprogramming the ECU to the Euro specs? My next step is finding a place in the Chicago area that would be able to that. I'm not sure if there is a Porsche performance shop around here.

blinkwatt · 12-04-2007, 12:24 PM

I don't want to burst your bubble but most CEL are triggered after several hundred miles have been driven.

How did they adjust the ECU to run RoW spec? Are you still able to pass emissions test this way?

Adam · 12-04-2007, 04:01 PM

Quote:

Originally Posted by SRQ Boxster

Picked up my car last night. Headers went on without any fitment issues, ECU was programmed for single use O2 application and Dynos were run. MY max rwhp without these headers was 182.5rwhp. and 199.6rwhp with headers for an increase of 17.1 rwhp.

Are you sure you have an S!? Those are 2.7L #'s there.

12-04-2007, 04:46 PM

Quote:

Originally Posted by Adam

Are you sure you have an S!? Those are 2.7L #'s there.

Lol thats what i was thinking!!! post a pic of your car!!!!

SRQ Boxster · 12-05-2007, 03:42 AM

My car is in fact an S. I don't know why the HP is indicating as low as they are. The car is quite healthy and I know it not actually "missing" the 45-50hp. I auto-X this car several times a year and have never finished out of the top 5. I've always giving more credit to the car as I dont dont consider my self that good of a driver. Here's a PIC from an earlier thread.