[ba] Re: [s-cars] 80tq Update: 516 wheel hp, 450 wheel TQ
JShadzi at aol.com
JShadzi at aol.com
Thu Mar 3 02:15:51 EST 2005
I do believe this to be an accurate measurement of Torque and HP, granted
there is the whole "dyno accuracy to flywheel extrapolation" issue, but that
withstanding, this is an accurate measurement of TQ to HP.
The reality is that there is just no way to force this much air through a
2.3l motor at low RPM. There are realities that dictate what the power band
will look like, realistically this motor needs solid lifters, cams and a
redline of 9krpm.
This isn't an attempt to build a real streetable, torquey motor, this is an
experiment in pushing limits. If and when the time comes that I get really
serious about "driving" this car, I will put back in the 034EFI HO hybrid and
make this power curve: _http://www.80tq.com/images/20vt/80tq_455whp.jpg_
Also, don't be deceived by how much power this motor is really making, 300
HP and TQ at 5100rpm, the power increases dramatically and makes the rest of
the curve look small, but calculate the sheer amount of power under this curve,
and its easy to understand how blisteringly fast this car is, even with a
low redline of 7500rpm. A shift out of 500 wheel HP puts you back into 300+
wheel HP, even with the stock gearing.
Regardless, I want to emphasize that this isn't a project for TQ and low rpm
street driving, I hope to continue to push the limits of how much air can be
forced through this motor.
In a message dated 3/2/2005 10:52:51 P.M. Pacific Standard Time,
calvinlc at earthlink.net writes:
Well this is definitely pretty impressive but I am wondering if that graph
really depicts reality, i.e. 2 times as much torque at 5600 rpm vs. 4700 rpm
and a "redline" of 7500 then you would need a tight ratio tranny to take
advantage of all of it and you would be doing alot of shifting. This looks
like the perfect engine to mate to a CVT. Cruise at 3300 rpm on the highway
and when the throttle gets mashed spin to 5600 rpm and just hold it there
while the tranny adjusts the gearing. That would be pretty exciting!
Also, I am wondering if you have done any comparisons with the other high HP
cars around here that aren't quite as "peaky" but also don't put out as much
peak power power, is the area under the curve approximately the same from
3500 rpm on?
Definitely the highest numbers I have seen from an I-5 without factory
backing, as far as peaks go.
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