Dyno 97 GTS w cat-back, tubes, filters, VEC

[Jay Lopez]

Here are the dyno results of my 1997 GTS, 30,000 miles, Roe Racing VEC (+8, -8 settings), Borla Catback, Smooth Tubes, K&N filters.

Location: Dallas, TX
Date: 1-20-01

Max Power at rear wheels: 421.0
Max Torque at rear wheels: 463.3

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[Supercharged Vipermad]

Did you by any chance try doing a run on the same day with the VEC set to 0/0 to get a before/after comparison?

 

[Jay Lopez]

I did not try 0,0 with the VEC.

 

[Bill/APEX Motorsports]

Jay, did you monitor the air/fuel ratio with the VEC installed? I ask because we ran dead lean on a '97 GTS. So lean that we removed the VEC to prevent damage to the engine. The supplied AFR gauge said it was running just about a perfect AFR, but the wide-band AFR on our dyno said otherwise.
Sean said he hadn't seen that before, but I talked to a couple people who had experienced the same thing. I think there are a lot more VECs out there working properly than not, but it's worth it to check the AFR using a wide-band unit to make sure everything's hunky dory in there!