Thanks for running the simulation.
The figures you calculated seem plausible for my car. As I mentioned before I haven't really done any all out runs as I don't trust the engagement point on my clutch (erratic). I also don't really have any equipment to make an accurate measurement either.
Comparing to a Porsche 911 (997) Carrera S which I have experience with and can do a 3.9 sec 0-60, the Lotus is not as fast but certainly is not slow. In my impromptu stop light drags (with myself) the seat of the pants feeling is something like 5 secs for the Elan. Not a lot of wheel spin as the tires are quite sticky. The car just hooks up and goes. The pickup in various gears from 3000-7000 rpm is also a blast of acceleration and aural sensation as the twink winds out. Very cool and impressive for a 50 year old car.
I think a 4.5 to 5 sec 0-60 time would have taken my breath away at one time. But, having driven the Porsche and more recently having had the opportunity to drive a Ferrari 488 Spyder (2.9secs 0-60, 6.4 secs 0-100, 10.6secs 1/4 mile @135), one tends to normalize a new baseline of expectation and fear. For example, a friend's 289 AC Cobra which seemed impossibly fast to me in my youth would now still be exciting but would not blow one away. However, the 488 does blow you away.
I also realize, that I am quite content with the Elan's performance neatly packaged in an historically significant vintage car. The 488 gathers a crowd but the Elan also attracts curious attention as well. In certain urban venues (New York, Miami, Los Angeles, Monte Carlo, London?) the Elan is probably more rare as some display their latest toys like the 488 (not meant as a criticism).
Further I have concluded that there are modern cars out there that are perhaps best left to younger folks with better reflexes and perhaps a callow sense of invulnerability with no fear. But, admittedly, out and out performance can be addictive.
Now back to my very fast "old" Elan.