Actually from 89-90 the usdm 240sx got the SOHC ka24e and 91-98 usdm all have the DOHC ka24de. I wouldn't say the KA24de has less potential than the SR. Yes, it revs lower--but it also has .4L of extra displacement to give more low end grunt. Properly turbocharge the KA and you can get over 280rwhp with stock internals. With strengthened internals you can see figures much higher. Or you can go with an SR which drops right in and will safely produce around the mid to high 300s on stock internals...either way, a formidable engine and a very fun car to dr(ift)ive. =)
Not sure about how to fab an SR...it would be hard to make the skyline's rb26 engine look like an SR because you'd have to fabricate new manifolds, change the valve cover (and writing on the valve cover from 24v to 16v
)...change the placement of a few fluid reservoirs, etc etc...a lot of work to get it accurate...I say just drop the rb26 into the model's chassis as is...a small minority of owners have done this (or an rb25 swap) on their real life cars, although it requires a lot of labor and usually equates to driveline soup.
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Originally posted by Ranger_X
I believe the S14 Qs has an SR20DE and the Ks has an SR20DET. I'm not too sure, we got shafted in North america. All we had here was the 180sx (called the 240sx h/b here) and the S13 coupe (240sx coupe & conv) both had the KA24DE engine in them (which is more powerful than the SR20DE but doesn't have near the potential) and we also got the S14. I believe it came with the SR20DE as base and the KA24DE as an upgrade, but no SR20DET for us 
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