whp vs wtq
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whp vs wtq hey. i have a question for you guys, it might be a dumb one but i just dont know the answer. i see these big lift cams making over 400 to the wheels easily, but the torque is no where near the same. take the ms3... most guys w/ manual transmissions are over 400whp but only like 370wtq. why are there no big torque numbers?
in a nutshell more duration will move your power band up higher, guys with huge cams are moving their power band so high that it is affecting their torque numbers.
so, its not really the lift that is hurting their low-end torque, its the duration.
bigger is not always better.
so, its not really the lift that is hurting their low-end torque, its the duration.
bigger is not always better.
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From: NJ
at least your learning the right stuff. TQ is what makes you pull ahead and win races, especially on the street. you want to have a high but flat Tq curve as possible to have a great street car. that way your powerband is from mid to high where you will use it.
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From: England
Originally Posted by LastLT1
hey. i have a question for you guys, it might be a dumb one but i just dont know the answer. i see these big lift cams making over 400 to the wheels easily, but the torque is no where near the same. take the ms3... most guys w/ manual transmissions are over 400whp but only like 370wtq. why are there no big torque numbers?
Firstly is actual setup having a good DCR (dynamic compression ratio) with a well specced cam for the rest of the mods should offer a good low end and PEAK torque numbers.
The other side is HP is derived from torque:
HP = torque x rpm / 5252
So it means if your car makes 350lb ft and you mod the car so it know makes the same amount of torque but 500rpm higher in the rev range then it will produce more power but the torque figure wouldn't have changed.
In most cases the torque figure does actually increase but with "bigger" cams it will certainly move the torque up the rpm range which is what has the most affect.
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The new LSK lobed cams that are in development with various sponsors on this site, are showing higher torque numbers than previous due to better DCR (as mentioned above), tighter LSA, and higher lift (primarily on the intake lobe).
It all depends on where you want to make power, and what your goals are for the car.
I chose a larger proven cam because I do most of my racing at the track, my car is not my daily driver, already had a big converter (tci 4400), and I like the sound of a choppy cam over a medium sized one.
It all depends on where you want to make power, and what your goals are for the car.
I chose a larger proven cam because I do most of my racing at the track, my car is not my daily driver, already had a big converter (tci 4400), and I like the sound of a choppy cam over a medium sized one.
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well im the other way. i go to the track once in a while. most of the racing is on the highway. its not a daily driver either, maybe drive it a handful of times a month. i have a manual too. i do luv the sound of the choppy cams also.
I know this is a subjective point, but when evaluating a cam selection, dyno results are just part of the picture. You really need to factor in the track or driving performance also. Some cars with lower dyno torque numbers for instance may run much quicker on the street than cars with higher torque numbers on their printouts.
Torque is really produced by dynamic compression. It just so happens that smaller cams usually have more dynamic compression because the intake valve closes earlier. Now increasing the duration does not actually lower torque itself. As stated, it raises the torque powerband. The bigger cam may make the same torque, but now its at a higher RPM and therefore makes more HP. If it were really a question of the larger the duration the less torque, then the stock cam would be walking all over the 224, 228, f-13 and torquer 2 in torque numbers.
Originally Posted by GuitsBoy
Torque is really produced by dynamic compression. It just so happens that smaller cams usually have more dynamic compression because the intake valve closes earlier. Now increasing the duration does not actually lower torque itself. As stated, it raises the torque powerband. The bigger cam may make the same torque, but now its at a higher RPM and therefore makes more HP. If it were really a question of the larger the duration the less torque, then the stock cam would be walking all over the 224, 228, f-13 and torquer 2 in torque numbers.
