So when I ordered the undertray I also decided to finally finish off the power setup on the car--this is the mil.spec 64mm throttle body. Everything stock has been replaced or ported now!
Stock TB is 60mm, this one measures just a hair under 64mm on my calipers on the IM side:
Only problem is, the inlet on my MAP Rev3 manifold was 61.5mm
After talking to a few people at MAP it seems as though you need to specify what size inlet you'd like when ordering...I picked up this manifold second hand so I'm stuck with what it had on it. Sure it's not *that* far off but heck, if you're going to do something, do it right eh? Off came the IM again, and out came the porting bits...
After a quick boost leak test and she was back on the road. Idle is the same. Low-speed driveability is the same. Light boost and part throttle the car seems a little more snappy, which is really just what I wanted! WOT...um, WOW. The car is now another notch towards retarded...or redonk...or whatever. All I know is the difference is insane.
How can this much difference be had with just a TB swap? I am seriously in awe, this must have unlocked some of the potential of the fancy-dancy Rev3 IM and let the rest of the engine flow more. I was hoping to see some good basic improvement but yea....this mod is WAY worth it and I'm WAY happy.
Car is definitely going to need more fuel pump here soon.
Also, something not so happy I discovered with the IM off....gunk all over the backside of the intake valves:
Time for some MCCC, prolly next oil change.
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