Join Date: Jul 2009
Location: Brisvegas Australia
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Csteingraber, if you want to change over to the SP2 throttle bodies, you will need the Throttle bodies themselves, the rubber boots that go between the throttle bodies and the motor, the clamps for the boots, and the velocity stacks.
All cables are interchangeable, and the unit will just plug into your existing wiring harness, providing that what you pick up is complete. I don’t know about the airbox though, as I installed one of Turn One’s at the time. Thinking back, the bottom of the airbox box sat on top of the throttle bodies, so there will more than likely be a difference; SP1 TB’s are 54mm and the SP2 TB’s are 62mm. there are differences with the injectors as well… SP1’s had 4 holes per injector, and the SP2’s had 12; I don’t think you can change them around without too much mucking around.
Once installed, you will need to run a power commander, and have the bike mapped. That’s all there is to do.
Now for the good bits; if you are going to do this, consider running a bigger airbox, and possibly a snorkel. I ended up doing the whole lot in one hit… SP2 TB”s, Turn One CF airbox and snorkel. When I had mine Mapped, I was pushing 133 RWHP, but I know that is dependent on the dyno. The seat Dyno liked what happened; the bike was a lot smoother, fuel use was around the same, but the bike sounded like it was breathing better, and wanted to go harder.
As Mark says, there is proof that the SP1 TB’s will make more mid-range horsepower than the SP2’s, but the trade-off is that it will take away a lot of the jerkiness associated with the SP1. The call is yours; I am sure you could pick up both types of throttle bodies if you look hard enough and didn’t want to go through setting up the SP2 TB’s