Hi,
The key to the HF build up is car weight. HFs have the lightest weight of any CRX at 1916 lbs. Now if you do the math, a GS-R on the street is around 2760 lbs (ignoring driver in both cases). Most stock GS-Rs (94-96 cars) dyno at around 142, 152-160 with the usual bolt-ons.
Let's do some math:
HP = Vehicle Weight * (Trap speed/234)^3
or
Trap Speed = 234 * (HP/weight)^1/3
For the cars to have equal trap speeds set the two equations equal to one another for the CRX and GS-R, with x being the hp the CRX needs to match the GS-R:
234 * (142/2760)^1/3 = 234 * (x /1916)^1/3 --- divide both sides by 234
(142/2760)^1/3 = (x/1916)^1/3 --- cube both sides
(142/2760)=(x/1916) --- now it is simply a function of power to weight
x = 98.6 hp!
Now as someone pointed out the the gearing of the HF sucks which is not reflected above. The HF build-up in the articles section is not meant to give you a car that will beat a prepped Civic Si, GS-R or Type-R. Is is meant to be a quick and cheap way of getting a inexpensive car (~$1500) to be reasonably quick for a little wrenching and a few bucks ($500). I think it is a great starting point for anyone just getting into Hondas and doing their own motor work, as the cost-benefit and cost-screw up ratios are not that much. If you make a mistake you're out a few hundred bucks, try that starting off with a B-series motor in the aforementioned cars and you see why this is meant to be "fun", not to give you a 13-second car.
I say do it...have fun, then use this quick little miser to go the the parts store for a nice B-series project...
Cheers,
Michael