Why does the Std motor only make 70 Hp, when the DX motor has the same DPFI and 1.5L, but the DX makes 20 more horses ?? I'm fixing to buy a STD. car for $100.00, and I was thinking mini-me, since I'm turboing my current DX.... Thanx..

 

2 things make the big difference between the STD and DX motor

DX=16 valves
STD=8 vavles

DX=9.2 to 1
STD=9.1 to 1

 

also cams prob make a pretty good difference. they make 5 hp between the 88-89 and the 90 91 see our x si's

 

Yep, what he said. However, only 1 thing IMO-- 8 vs 16 valves.

 

i had 16 valves on my std motor

 

yes the std is 16 valves.

 

Yes, standard has 16 valves. I put a dx head on my old 90 std and it picked up a bit. The cam is the only thing I could tell that was different. ECU's, intake, exhaust, and block are the same. The tranny is also a weak point with only 4 gears and no overdrive. My 4-speed std with dx head ran a 10.9 1/8th stripped which is slow but much faster than it would go with 70hp.

 

from what i understand the motors are the same, just some points of the car changed. like pass. side mirror, tach, clock, and little stuff like that