John vehemently wanted me to post my results, no matter what they were, so at his request, I will.......
I've identified two unfortunate problems in regards to the legitimacy of my dyno runs. First, I believe my exhaust has clogged cats, since my last two dyno sessions have seen my numbers decrease, despite better products, and what should be improvements due to the break-in period. I believe any of the people that were at the dyno day would agree with me in this regard, since my exhaust doesn't sound quite right compared to other Cobra's that were there with nearly identical systems.
What's more, this unit, to the best of my knowledge, is the first one of it's kind to be tried on an 03 Cobra, and the fitting of it is in need of further R&D. The meter pipe itself is about 2" too long. This resulted in me being forced to call a friend from around the block to come help me install the unit. He had to use both hands and force the entire assembly toards the TB in order for me to even be able to hook the filter to the pipe. Literally, if I needed 1/8" more in order to get the filter on, I wouldn't have been able to. This, obviously, resulted in a test that wouldn't/couldn't produce any reliable evidence. Due to this unfortunate set of circumstances, it's useless to post the numbers, since they are flawed.
The only bits of evidence that I CAN legitimately report are my A/F ratio during the dyno run (though because of the above mentioned circumstances, I would question that also) and the issues with drivability, hesitations, and idle fluctuation.
My A/F was very slightly leaner down low, but richened up as it worked across the power band. With the meter, I don't believe it will further lean out a car. But because I literally had to mash the meter tubing all the way together, it could have easily caused problems. I'm not enough of an expert to form a hypothesis regarding this, but there's the results.
As for drivability, I can tell you that my car has never had as nice an idle as I've had the past couple of days with this unit on the car! When the car was purchased brand new, I was so concerned with the idle that I had one of the better service advisors put the car through a few hours worth of tests. The report that came back was that the rough idle was normal for these new Cobra's. Turns out that it's the truth, since I've seen numerous complaints regarding same. With the original DC on my car, I had some very slight idle roughness. However, with the Univer on the car, my idle was steadier than the day I drove it off the dealership.
My only conclusion is that I can't wait until I can get a better fitted meter, and get my exhaust system figured out, so that I can match the potential of the Univer to my car. For myself, I'd pay the extra money just to get the idle where the Univer put it. That may not be for everyone, but I had issues (obviously) with the rough idle. I also privately wonder if having the filter mashed against the fender well didn't hurt it's air intake.
I can't produce reliable data on this set of runs, but I can tell you that the idle and drivability improvements are there!
We're going to do another dyno day in the next few weeks. John may choose to send a Gen-2 Univer to a different owner, which may not be a bad idea since my exhaust is having some kind of problem, but if he doesn't, I'll try and report more at the next dyno day.
I've identified two unfortunate problems in regards to the legitimacy of my dyno runs. First, I believe my exhaust has clogged cats, since my last two dyno sessions have seen my numbers decrease, despite better products, and what should be improvements due to the break-in period. I believe any of the people that were at the dyno day would agree with me in this regard, since my exhaust doesn't sound quite right compared to other Cobra's that were there with nearly identical systems.
What's more, this unit, to the best of my knowledge, is the first one of it's kind to be tried on an 03 Cobra, and the fitting of it is in need of further R&D. The meter pipe itself is about 2" too long. This resulted in me being forced to call a friend from around the block to come help me install the unit. He had to use both hands and force the entire assembly toards the TB in order for me to even be able to hook the filter to the pipe. Literally, if I needed 1/8" more in order to get the filter on, I wouldn't have been able to. This, obviously, resulted in a test that wouldn't/couldn't produce any reliable evidence. Due to this unfortunate set of circumstances, it's useless to post the numbers, since they are flawed.
The only bits of evidence that I CAN legitimately report are my A/F ratio during the dyno run (though because of the above mentioned circumstances, I would question that also) and the issues with drivability, hesitations, and idle fluctuation.
My A/F was very slightly leaner down low, but richened up as it worked across the power band. With the meter, I don't believe it will further lean out a car. But because I literally had to mash the meter tubing all the way together, it could have easily caused problems. I'm not enough of an expert to form a hypothesis regarding this, but there's the results.
As for drivability, I can tell you that my car has never had as nice an idle as I've had the past couple of days with this unit on the car! When the car was purchased brand new, I was so concerned with the idle that I had one of the better service advisors put the car through a few hours worth of tests. The report that came back was that the rough idle was normal for these new Cobra's. Turns out that it's the truth, since I've seen numerous complaints regarding same. With the original DC on my car, I had some very slight idle roughness. However, with the Univer on the car, my idle was steadier than the day I drove it off the dealership.
My only conclusion is that I can't wait until I can get a better fitted meter, and get my exhaust system figured out, so that I can match the potential of the Univer to my car. For myself, I'd pay the extra money just to get the idle where the Univer put it. That may not be for everyone, but I had issues (obviously) with the rough idle. I also privately wonder if having the filter mashed against the fender well didn't hurt it's air intake.
I can't produce reliable data on this set of runs, but I can tell you that the idle and drivability improvements are there!
We're going to do another dyno day in the next few weeks. John may choose to send a Gen-2 Univer to a different owner, which may not be a bad idea since my exhaust is having some kind of problem, but if he doesn't, I'll try and report more at the next dyno day.
