'98 project car - Page 3 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Lemming · 03-03-2021, 10:23 AM

Quote:

Originally Posted by itsnotanova

Don't forget to grab and use the complete S coolant tubes from the front to the back. It's my opinion that the tubes are more important than the third radiator. The 996 doesn't come with a third radiator but it does have the larger tubes. Porsche started using the larger tubes for the base 2003+ tiptronic boxsters too. I've seen a few racers regret not converting over when they had a chance

Didn't see you at COTA this weekend?

Great suggestion, I did not realize that there was a difference in tube size. The center radiator was damaged in the crash, so am looking for a good used one for the transplant.

I really wanted to go to COTA this year, but was hoping that they would have an open track day on Thursday prior to the event. Guess the cost is prohibitive. I'll get there one of these days. Next PCA races for me are Road Atlanta and NOLA.

Lemming · 03-16-2021, 01:22 PM

If anyone is looking for parts from a 2001 S, let me know. Keeping engine, trans, head/tail lights, and body panels. Interior and other parts will be sold. If you need something let me know.

itsnotanova · 03-30-2021, 04:37 AM

Quote:

Originally Posted by Lemming

I really wanted to go to COTA this year, but was hoping that they would have an open track day on Thursday prior to the event. Guess the cost is prohibitive. I'll get there one of these days. Next PCA races for me are Road Atlanta and NOLA.

It was the lowest turnout I've ever seen at COTA. Only 18 in spb! Usually it's double that. Have you heard there's a new racing series for SPB at ECR and MSR in Cresson? It's bringing some excitement back to the Texas SPB racing scene. I got to finally go see ECR in person and ride along with a friend in his Spec 996. What a wonderful track!

Lemming · 11-07-2022, 02:55 PM

Getting the car flashed was a PITA, all those that said they could do it, couldn't. I finally took the ECU with me to ECR last month and John G did it in a flash (so to speak). Car is running and it is strong. Headed to the dyno on Wed, will post results when I get them.

Lemming · 12-15-2022, 10:44 AM

Two dynos are shown below.

Blue line was with 2.5 headers and midpipes (with cats) and 3.2L muffler.
Red line was with 3.2 catless headers, catless midpipe, and 3.2 muffler.

Max HP increase was just less than 10 HP and 12 lb ft of TQ, but usable power throughout the range is much better, at times 20 lb ft of torque as well as HP.

Still a bit fat on the air/fuel.

ike84 · 12-16-2022, 11:41 AM

Nicely done!

I'm curious, do you have pics of the specific headers you tested? I'm curious to know if there's much of a difference in piping diameter or if the only real difference is the lack of cats.

Also, did you make any intake adjustments between the test? Maybe I missed it, but what intake setup did you use?

Also, for your AFRs, it looks like you're running around 11ish? That's standard programming for our ECU to run at WOT (or at least that's what my 996 tune does). It will be quite tricky to tune that out without altering the maps.

Sent from my SM-N976V using Tapatalk

Lemming · 12-19-2022, 05:42 AM

Headers are from Electrodyne, they had a black Friday sale that came in handy (35% off), midpipe catless headers are from Circuit Werks (non resonator version).

For the intake I have a 987 Cayman S airbox, custom intake piping and a 996 mechanical throttle body. Nothing on the intake side was changed between dynos.

Most of the A/F is 11.75-11.5, the only time it's near 11 is at 6K rpms. In contrast, my SPB (2.5L stock intake system and exhaust headers) runs from 11-10.5 throughout the RMP range.