General Discussion Area > Corvette Related Chat
HELP....my so called performance slug
daniel42au:
Realising the forumula for converting hp to kw and visa versa is:
Horse power (hp) ---> Kilowatts (kW): hp x 0.7457 = kW
Kilowatts (kW) ---> Horse power (hp): kW x 1.341 = hp
According to your dyno tuner, your car is puting out 182 hp at the rear wheels...
Chevrolet say your car was worth 240 hp at the flywheel when it left the factory 18 years ago... and this is probably without accessories....
The pundits say ya lose about 25% of power from engine to rear wheels.... due to gears, differential, accessories and such....
25% off 240 gives you 60hp... which leaves you with 180 hp.... hmmm....
Also, realise that your local dyno is an experiment of ONE... it may or may not be totally accurate.... it is like the set of scales ya weigh yourself with every morning... if ya want to know if your losing weight use the same scales every morning....it may not be accurate but it gives you a reference point.... but if ya want to lose weight without effort find a set of scales which weigh 5 lbs under .... :) but dont go back to it again. What I am saying is that no one goes around calibrating dyno's against a known output so who knows how accurate each one is....they are only reference points.
If you really wanna know where ya stand....my suggestion to you is don't be shy.... take it to the strip and have some FUN... cos the proof is in the seat of your pants... as others here have said if it aint pulling low 14's THEN ya know ya got a problem.
regards,
daniel42au
http://members.ozemail.com.au/~daniel42au/
daniel42au:
Point taken... but the point I draw between the lights and the strip is that at the street lights I am not behaving like a hoon with high revs.... when the lights change I just put the foot down from idle and let the slush box and the V8 do my torquing.... by the time 60-80kph comes around then I dont wanna play anymore.... because there is no law against nice accelleration. :-)
--- Quote ---Originally posted by 87Z51
which is more useable Torque or Horsepower?
and where?
at the traffic lights... where 95% of us drive?
or the drag strip ... where 5% of us drive?
Same situation either place.The torque is what gets you moving.
A L98 will out run a LT1 to 60mph on torque alone then
two things happen ;
the L98 with it's TPI intake runs out of breath and the LT1 with it's top end manifold comes on line.
Stock for stock a LT1 will run a faster time than a L98 but the L98 will probably run a better 60Ft.
Inherent problem for L98 cars is the torque is so big low down that traction becomes a problem especially in manual cars.
One of the few situations where it is benefical to bleed off some bottom torque so as not to spin up.
--- End quote ---
BOSCHVETTE:
the problem that i have racing off the lights is that with high tyre pressure,cold tyres and the usual build up of oil and crap at the lights i just fry the back tyres into a cloud of smoke, so i tend to wait till the mid of 1st gear before i start to feed the power in.
87Z51:
"I am not behaving like a hoon with high revs.... when the lights change I just put the foot down from idle"
No advantage with a L98 loading up the revs on the line.
At the strip I use the same launch technique I use on the street ;
off idle and nail it = 1.7 60fts
The only difference is how long I keep my foot into it.
nifty:
havnt read all posts,but i think gear ratio also has a lot to do with it.years ago i had a (dont laugh) a suzuki sierra 4wd,fitted with the big block 970cc 4 stroke,now this thing had 4:11 gears,and blew most things off at the light.hehe even a compresser mercedes....much to his disgust...hey it happens.but top speed was a killer 110kph.flat out.now if anyone has ever driven one of these thing off road,they will be amazed,low weight,killer low ratio and the abillity to out perform some serious off roaders..think patrols,landcruisers etc..... so how much DOES hp have to do with anything?.... im thinking gear ratios and torque....hp is great for top end stuff, but imagine 500 hp on the street? be real...i would rather be able to pull a wheelstand than run a 200+kph car.
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