The Honda guys have a bunch more options when it comes to performance. The Supra can be made faster but man does it ever cost!
Breathing is the key here. Headers and a less restrictive exhaust wywtem for starters. I just don't understand why the camshafts are so expensive for these cars, but you really need to upgrade them to get major improvements. I don't know of any engine builder that doesn't go that route. You can adjust the stock cams to change when the power comes in, but I don't think you can feel it.
The head is the next area. At least match port the exhaust holes. They are very small compared to the gasket and I still don't understand why they didn't make it the same type port as the intake side, but I guess the smaller holes make better low end torque.
You can go larger on the valves, 1 to 2 mm for each. The combustion chambers seem to be pretty good, but there is always room for a little more improvement. The next item is compression. I wish I knew what you could mill off the head to get maximum compression and still have a good head. I know on my old 22R engine that I raced with, it was 180 thou off the head!
It looks like a lot of meat on the heads so I would think 60 to 80 should be safe, and I think you can get that adjustment out of the cam belt. You can also deck the block to get a little more, but include the timing cover. These are non interference heads so if the cam belt breaks the valve won't touch anything. If you do mill the heads a lot the valve to piston clearance may become an issue, but I think you have a lot to work with.
Timing and fuel can help too. You can really advance the timing, but you have to use better fuel, premium to make the most. The engine is just an air pump, get more in and out and it will go faster, that is why the turbo is so nice. I think the previous reply about 700 hp engine for stock cams is really only for the turbo model because of the air being pushed into the engine. You need help on an N/A engine.
Lightening the pig, I mean Supra would help out considerably too. The car weighs almost 2 tons! Shave that down to 3K and you can have a really fast and nimble Supra.
Good luck and let us know how it goes.
Russ
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