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Its not a bad engine, the 22 degree angle is considered to be optimal for torque, and is the same angle used in formula 1 cars. its the same angle as the s2000 motor putting out 100HP / liter.
If you get rid of the restrictive stock air flow filter, throw on a huge cone filter you gain a considerable amount of HP,
Also, if you were to enlarge the throttle body, and file down the TB bar, you can gain a considerable amount of flow,
The runners could use some enlarging, and the area behind the TB needs to be ported as well.
porting the heads will net you tons more power as the valve seats are very bad, and the intake valves and exhaust valves are tiny, and there is alot of overlap that doesnt need to be there, sharpen the port divider as well.
and finally lose some weight on your car, and you will really feel a huge difference from stock. Ive lost about 200 pounds from stock, and the revs climb much faster.
It really comes down to increasing flow in and out of the engine. This engines actually quite good, but it really needs a full port job to recognize the potential.
PORT the Throttle body, runners, head and exhaust, increase the manifold runners diameter, and get a larger cat and exhaust all around and you will have a really strong engine.
The engine in my rolla has 280,000 miles and runs stronger than when it was new. Tho im building a 7age now, i have to merit that the 4afe is strong but leaves me wanting more.
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