Throttle Body Issue
I have a young customer with a manual BA XR8. I decided to play some R and D games with him.
I had him drop his car into my shop everynight this week. I would make a mod, then send him home. The next day, i would change it back. All the while, telling him to thrash the car and tell me what he thinks according to the "Bum-o-meter".
Monday night, he called in. He sat in my waiting room. ( at no time has he seen what i have done to his car, he is mechanically illiterate ) and i pretended to change something.
He went out and thrashed his car all night, and called me a few hours after making the "mod" and told me that it didn't feel any better. Since i hadn't actually made a change, i was happy with his honesty.
I had him return the next day, and he instructed me to put the car back to standard. so, again whilst in the waiting room, i made a change.
I removed his standard TB and 75 helix, and fitted an 80mm TB and helix. Being a BPT throttle body, he was unable to visually determine a change.
As far as he was concerned, i had put his car back to "standard", and drove off in his car.
Later that night, he called me on my mobile, and laughed and said that in standard form the car felt stonger everywhere, and he wouldn't waste his time with the change i had proposed.
He didn't know it, but he solved a problem for all of us.
The car had at the start a Battens CAI with a BMC, and a BPT 75mm helix. Without being emotionally "coloured" by a pre concieved idea of what the mods should deliver, his opinion was that the car did in fact benefit from the 80mm setup. He didn't even know it was on, he was giving me his heartfelt opinion.
This car has no further mods.
I revealed my trick to him last night, and he didn't believe me. So i showed him. he smiled, and told me i wasn't getting the 80mm gear back!!
His invoice is in the mail.
The motto of the story is whilst changing parts is the only way to find out, you can have your own mind "tainted" by an expectation or idea.
I have seen guys with bazooka sized exhausts that sound like a banshee, and the owner swears the car is faster.
it may sound faster, but thats not always the case.
Dont be coloured. Be educated. Dyno, or track. that is the ONLY way to learn.