We've discussed this many times, Liarboy.
First, I've been getting better as a race driver, AND my first car was
definitely an oddball (meaning there was no information out there about
how to set it up), and it was also about 20 pounds overweight. That's
about 2%, which makes a difference.
The new car was pretty much at the lower limit for weight, and it was a
car that was very successful overall and so there is LOTS of good
information about setting it up.
Is it a better car than the RF89? Well of course it is! Do you think
that 9 years of development by Van Diemen wouldn't result in a better car?
As for the Honda, as I've told you already, the engine was designed to
mimic the power curve of the Kent, and did so to a very fine level of
accuracy. People choose to run the Honda because neither time nor money
are in infinite supply; particularly time on a racing weekend.
The Kent requires far more attention and it is far, far more expensive
to acquire a Kent with competitive power. A new engine from a top engine
builder (there are basically only 3 or 4 in North America) will cost you
north of $10,000USD, and you'll be getting rebuilds on at least the top
end every year.
By contrast, you can buy a Honda L15A7 engine from a 2009-2012 Honda Fit
from a wrecker for less than $1,000, and there is no tweaking needed
(nor really allowed) to be done. Yes: blueprinting is allowed, but
according to the engine builders, it will gain you a maximum of 2hp...
...which is what you'd get simply by running a brand-new engine in.
And the Kent is operating beyond the operating limits for which it was
designed just to be competitive. It is running well beyond the rev limit
it was designed to run in the mid 1960s and a very small over-rev can
lead to the destruction of the engine (as I learned once to my dismay).
The Honda is detuned to run BELOW it's designed limits, and it is a far
better engineered piece to begin with, having been designed in the
mid-2000s with the aid of computer-aided engineering. So...
...nothing goes wrong and you don't need to spend any time taking care
of the engine when there is so much more that needs doing on a race car.
That is why the top teams run Hondas. That is why anyone who is serious
about racing every weekend.
People who know say that the Honda has a small advantage where tracks
have corners that must be taken at below the absolute optimum RPM,
because a modern electronically controlled engine tends not to have a
throttle response issue when the throttle is opened from slightly below
the best operating range, but the Kent has the advantage in absolute
top-end power as well as the fact that there is no rev limiter, so you
are able to choose a slightly shorter top gear and get better
acceleration when running alone, and still be able to take advantage of
the tow from a car running ahead of you.
By contrast, the Honda does have a limiter, so you have to ensure you
choose a gear that is tall enough that the car won't stumble when you
gain those 5mph running in the draft of a car ahead. That means your
acceleration when there isn't a tow will be compromised.
In short, Hondas don't make you faster overall, but they're more
reliable, which makes them a better choice for anyone who wants to
concentrate more on the rest of racing.