First: That is an amazing turnaround Hoist, bet you don’t sleep tonight thinking about that whole warranty issue, just kidding man, if you run into problems good things usually happen to good people and chit usually happens to assholes.
Second: I was not aware of this tuning issue, what would prevent the TM/AT from working with the stock head pipe?
Thanks
Gregg
The problem with the stock headpipe is that at low throttle settings fresh air gets sucked UP the left pipe and discharged out the right pipe. When this fresh air goes past the O2 sensor, the sensor thinks it's running lean and the AT will try to put extra fuel in to compensate.
Is this really a problem? I don't really think so. If you're at 0% throttle and 3,000 RPM, you're coasting down, and the what's the worst that can happen, some popping? I don't think its that big of an issue because the engine isn't really doing anything except spinning from the wheel turning it.
I have foud this out first hand in trying to tune my PC with the Daytona Sensors Twin Scan, which uses wideband sensors just like the TM/AT. I can only get reliable AFR readings for the rear jug at low speed when I stuff a rag in the left pipe, and run it as a 2-1.
For those of you that feel air coming IN the left pipe is not possible, this past Saturday I left my house with an old bath hand towel tightly packed into the left pipe to seal it off. My intention was to map out AFR readings for low throttle riding and then remove it for the faster stuff. When I got to my buddy's house, the towel was gone. I figured it got popped out on the way over. NOT!!
The towel had been sucked into the pipe chamber, and didn't come out until later when I was doing some 4th gear WOT runs. I was in front, and my buddy was riding behind as this was happening.
After one pull where I first exceeded the century mark, when he caught up, he was laughing so hard, I thought he was going to fall of his bike. He said when I pulled away from him, all of a sudden, he saw the towel starting to emerge from the left pipe, and then finally get shot out of the pipe onto the road. This means that in the 8 miles I rode to his place, even though I was staying below 20% throttle, and avoiding hard decels, there is enough suction on the left pipe to suck that towel up into the pipe.
Sowhat does this mean? The stock crossover pipe makes true O2 sensor tuning very difficult. True duals would make it all a whole lot easier.
Chief