If it is a fact that the HP output is different, my guess is GM is using a
different cam to better match the HP to the torque to provide a better
performance curve for the heaver convertible. Higher HP at higher RPMs is
common with Japanese cars but that is why they lose a lot of the much more
desirable torque, at the proper RPM
Not saying you should. I just figure the more you spend the more you are
concerned about certain things and less about others. I just bought a
sub-$30,000 car, I had no idea how much HP it had until a few days after I
bought it, but I knew lots about the fuel mileage, safety and reliability.
If I was going for a $100k+ vehicle, I would be more concerned about things
like paint quality, HP, tires, brakes, etc.
Punished? There may be a very logical reason once we find out. . I would
think the Pontiac dealer should be able to find out though. It does seem
strange that they would make a change in cam, compression, or most anything
for 13 hp. I also have to wonder if the web page has wrong information where
something was not updated. Could be the convertible needs a different
exhaust/header layout and causes a power loss. Different timing from the
computer for some reason?
Note that the SV6 has different ratings on the two models for the 3.5Lengine
also. 196 vs. 201 Seems like Pontiac uses a lot of different engines in its
line they have at least five displacements and sometimes two versions of
each. The Impala uses a 3.5Lwith a 211 hp rating with variable valve timing,
yet the Malibu is 201.
With all that said, how important is the hp rating? It is not the power, it
is what you do with it. So many other factors come into play like wheel
size, tire size, gear ratios, etc.
Sometimes I wonder if the stated ratings aren't just purposefully
understated for some models for marketing reasons. No one ever gets
in trouble for understating a bit. For example, when the base model
Vette and the V8 Fbodies both used the same LS1 engine, the Fbodies
were stated as having about 30 less HP or so. Yet gear heads that
don't work for GM seem to find that in fact they produce about the
same as the Vette (not the Z06).
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.