I already did the ignition, intake, exhaust and vx cam and want more power after all that without opening up the engine. I added a larger throttle body on another one of my cars and I did notice a diffrence in power. Is there antoher car that has a throttle body that is bigger that will work in a 240 b23 or can I just bore mine out?

The governing factor to flow is going to be a combination of air filter pressure drop and the orifice size of the tubing, TB, and AMM.
Obviously the thing that can't be increased without a lot of difficulty is the size of the AMM, so no TB increase can get you anywhere, unless you've got the early smaller size. IIRC the later (> '88) B23F/FT has the largest size possible along with the AMM.
I would just pull out the resrictions in the airbox and get a K&N if you already haven't done so.
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'89 245 Sportwagon, '04 V70 2.5T Sportwagon

Waste of money on a redblock, all a larger TB does is give you more of an opening faster, you can get the same effect by fabricating a smaller pulley for the throttle cable or just pushing down on the pedal a bit more.

Bill Watson did a test a while back using a manometer, the total pressure drop at 10psi and 5500 rpm across the TB was less than 1 inch of water column. To bring things into perspective 28 inches is one psi. If the drop is that small on a turbo you can bet we don't need a larger TB on our NA cars.



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Dave Shannon
Spring Valley, California
'84-245T 190K+
'88-240 190K+
'65 1800S ????K
'73 1800ES 117K
'92 745Ti 150K
Jeep Wrangler Sahara 10K
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