Monday, March 29, 2010

Throttle Bodies

The throttle bodies arrived, and they are incredible. Brand new, out of the box and shiny! From what I've read, I was thinking there was going to be more work than what I can see on these.

So, some basic facts: I bought a set of 1998 Suzuki GSXR 750 throttle bodies. So anyone reading this, that is looking for information on how to do this, keep that in mind.

I think most of the write ups that I have read state that there is a second set of butterfly valves that need removed. And then you have to patch the holes left over. And polish the mess that you left. Not the case in '98. Only one set of butterflies.
All of the examples I have seen have had two sets of arms that need custom spacers made. In 1998, there was one thread rod holding the set together, and one stainless (from what I can tell) steel bracket. So, some custom spacers, and a custom milled aluminum bracket to hold the other side together.
Since they are brand new, they have all the vacuum lines, and injectors. It is going to need very little work on this front.

Unfortunately, and you knew there was going to be one, I am seeing why getting the injectors to fit onto the intake manifold is such a big deal. The ZX2 intake manifold is soooo narrow, that I don't know if there is any chance that I will get the new throttle bodies on there. I am really considering the Raceline intake runners.

I am also thinking that I am going to abandon the IACV. The throttle bodies have a idle air bypass, that is adjustable. So with a little bit of work (HA!) I should be able to tune it at idle, without help from the MegaSquirt system.

More parts, more things to do.

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