This may stir things up but isn't meant to! Please read this whole thing
before you fire/flame another e-mail. It's meant to provoke thought, not
ire.
You may have caught on to the fact I like CarTest, the software simulation
program. It gives pretty good data. Here are some output files I have
posted, all under http://www.vectorbd.com/users/jpl/xxxx.pdf where,
xxxx = Performance the simulated performance of a stock N9TEA 5-sp
xxxx = 260perf above with 260 HP
xxxx = s4perf an 2000 Audi S4
If you can believe CT, a 300 HP N9TEA would only go 148 mph @ 5890 rpm. If
you went to 320 HP you'd only get to 151 mph and redline at 6000 RPM.
Simple math will give you that answer too I guess. The RevLimiter surely
goes above 6000 though, and flirting with that limit (how brutal can you
get with your wide-open motor), you "might" see 165+, but it'd take more
ponies.
I am also have a copy of TurboCalc from Ray Hall Turbos in Australia. I
have not proven this one as well as CT but I will report its results. I
entered the specs of an N9TEA and played with VE and other efficiencies
until it gave me about 180 HP and pretty matched other HP curves and specs
I have. I then simply up'd the boost to 20 psi. It gave me 270 HP. The
limit was a very high intake temp, over 300F. If enlarged the I/C so I
could get a more real intake temp, still in the high 200's but now the
power went up and if I set the RPM to 6000, I got just over 300 HP.
Lastly, I read (my wife says too much). I own books like the famous little
"Bosch Bible" and a few College Physics books. Here's a meaningful
summary of a section from the Bosch book.
The typical 3-box sedan has a Cd (drag) of 0.4-0.6 (505 is .41) and at 100
mph is takes 58KW (80HP) to overcome the drag. To go 150 mph requires 190
HP just to overcome the drag alone! Then's there's motor/drivetrain
frictional losses etc.!
SO WHAT DOES ALL THIS MEAN
==========================
- theory, simulation, anecdotal reports are never the same
- everybody wants to be right, nobody, I mean NOBODY is 100% right
- even simple math can be applied to verify many things
- you cannot repeal the laws of physics
- read as much as you drive, compare the 2, you'll be even smarter and get
to both places faster.
This archive was generated by hypermail 2b29 : Mon 08 Jan 2001 - 20:59:22 UTC