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You could disassembly and have it bored to 70mm. This requires this 70mm replacement plate from Holley, part no 26-130. The shop that did mine also shaved down the rod that holds the plate on one side and cut off the other side. The also tried to use low profile bolts to hold on the plate. This is what they do to their custom Holley 4 barrel carbs, so we both agreed it should help. Also, finally grind the throttle stop for full 90 deg opening.
Now you've seen my pics on my TB after it was bored with this new Holley plate installed. It looks mighty thin in the walls, but it is strong. I am however careful not to tighten the intake hose clamp too hard though.
Lastly someone suggested biasing the throttle position sensor to make the car think the accelerator is pressed down a little more than it acutally is. Supposedly will dump additional fuel. To do this it was suggested to drill the TPS mounting holes into slots so it can be rotated and locked down. I might try this, since I have another sensor anyways.
Oh, one last thing, these plates and the butterfly opening are not completely round. Actually it is slightly oval. I think so that a little air can leak around for idle purposes. BTW, if you don't play with the idle screw, it will idle fine when you put your TB back together. It requires a special torx screwdriver anyways, one with a hole in the center.Sorry so long.
After one week (about 300 miles) of driving on mine, I couldn't be happier. With these tires, road noise is virtually nil and this is a very firm yet smooth riding and stable tire. I'm expecting my gas milage to increase a mile or two per gallon as well since rolling resistance and steering effort also feels lower.
and no I don't work for or sell Bridgestones, just want to pass on my experiences with them so far.
RickThe Consummate 300M Pages
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