A few months back I had my 2006 9-3 2.0T SS dyno tuned. (I will post graphs soon). The car was run stock, then with a BSR Optiflow intake plus ECU remap, then with a 3" catless DP.
On the first pull the car made power up to 5000Rpm then the HP started to dip at 200hp @wheels and not make any more power.
The second set of pulls with intake and dynotune did the same except this time the dip in power moved back to 4500RPM and 210hp . So we did some trial and error that included re-installing stock airbox, changing the Platnium Bosch plugs that were in it when I bought the car to a cheap copper core autolite. checking fuel pressure, installing manual boost controller with guage to see if boost was cutting. All runs had the same dip in power.
Thinking the exhaust might be plugged or restricted at the Cats and muffler, I installed a 3" catless downpipe then did another run.... Same results except an increase in torque. The last possible option was to remove the muffler. That run made the same power give/take a few Trq/Hp. Power still is dipping at 4500RPM.
That being said. I trouble shot every know option until recently learning Saabs are picky about their spark plugs. I installed the factory spec'd plugs (NGK PFRT..??) . I have not taken the car back to the dyno since the correct plugs were installed. This may have fixed the issue. Before I make more pulls and find this wasnt the problem, are there any suggestions to what could cause this from experience?
so summed up, this is what was checked
Boost: 19psi and held steady
Fuel pressure : held steady
Air intake: Stock and CAI both checked
Plugs: incorrect Bosch platinums and incorrect Autolites ran on all pulls.
Exhaust: Catless, bigger DP, muffler on, muffler off.
please let me know if there is anything you experts can suggest.
On the first pull the car made power up to 5000Rpm then the HP started to dip at 200hp @wheels and not make any more power.
The second set of pulls with intake and dynotune did the same except this time the dip in power moved back to 4500RPM and 210hp . So we did some trial and error that included re-installing stock airbox, changing the Platnium Bosch plugs that were in it when I bought the car to a cheap copper core autolite. checking fuel pressure, installing manual boost controller with guage to see if boost was cutting. All runs had the same dip in power.
Thinking the exhaust might be plugged or restricted at the Cats and muffler, I installed a 3" catless downpipe then did another run.... Same results except an increase in torque. The last possible option was to remove the muffler. That run made the same power give/take a few Trq/Hp. Power still is dipping at 4500RPM.
That being said. I trouble shot every know option until recently learning Saabs are picky about their spark plugs. I installed the factory spec'd plugs (NGK PFRT..??) . I have not taken the car back to the dyno since the correct plugs were installed. This may have fixed the issue. Before I make more pulls and find this wasnt the problem, are there any suggestions to what could cause this from experience?
so summed up, this is what was checked
Boost: 19psi and held steady
Fuel pressure : held steady
Air intake: Stock and CAI both checked
Plugs: incorrect Bosch platinums and incorrect Autolites ran on all pulls.
Exhaust: Catless, bigger DP, muffler on, muffler off.
please let me know if there is anything you experts can suggest.
