[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

Hey Calvin,
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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