question about HP and tq??

[GstRacer]

now this may be another stupid question on my part but ive been in the game for a few years and never found the answer. my question is how do some of you guys have matching HP and tq?? with 2.0 motors. ive never had anything close. right now im running fp3065 and i have 376hp and 291 tq. with every mod you can really do other then meth. and i have a GST so how are some of you getting matching tq. thanks again.

 

[CanadianTSi]

Generally a Smaller Turbo that spools quickly will make good torque compared to HP.

It also just depends on your setup and how well your parts work together.

 

[GstRacer]

well if i give you my setup will you let me know what diff from yours? or why mybe i have low tq

 

[GstRacer]

well i looked at your setup and i noticed you dynoed with race gas, and my numbers are on pump. so thats a little diff. and i seemed to have a few more things done to my car then you do so i stil dont understand why. i think that your turbo might even be bigger then a 3065. it's tunned using dsmlink and its a pretty good tune not boarderline lean at all 24 psi on 93

 

[Xit40]

CanadianTSi is correct. To understand why you need to know how horsepower and torque are calculated. Horsepower is calculated from Torque. The formula is:

Horsepower = Torque(RPM)/5252​

Horsepower and torque are related measurements of engine output. In practical terms, an engines horsepower rating (hp) is most relevant to how well the engine performs at high speed, while it’s torque rating (expressed in pound-feet, or lb.-ft.) is most relevant to low-speed rock-crawling and trailer towing from a standing start. That's why people that have smaller turbines usually have a more equalized ratio. Also just as a side note that 5252 in the bottom f the formula is where the Horsepower and Torque figure cross on a dyno graph or in other terms are equal. Check it out the next time you see a dyno graph

 

[CanadianTSi]

My Dyno was done with my Old 50 trim. Haven't Dyno'd the new Turbo yet, but looking at my logs I lost a good bit of torque down low from the increase in Lag.

 

[GstRacer]

ok well that make me feel like my setyp is ok, does anyone eles have any ideas thoughts on this??

 

[Mr Peepers]

To put the two into perspective:
Horsepower is a function of torque and rpm. Torque is the quickest you can accelerate in a given gear, and is what you feel. The acceleration you feel through the rpm band will follow the torque curve exactly. While horsepower is the quickest you can accelerate at a given speed(mph). To run the best 1/4 mile time possible, you want to shift "straddling" the horsepower curve, not the torque curve.

If you look at a dyno graph, the ratio between HP and tq generally depends on where the torque is made. If it's made down low, the peak torque will be larger compared to the peak HP than if it were made high up in the rpm band. With a fp3065 you won't be fully spooled until much later in the rpm band than a 16g for example, and you'll be making all you torque higher in the rpm band. Horsepower rises with rpm, and even if you're making the same torque at lets say 6000 rpm as a 16g car makes at 3000 rpm, your horsepower(at that rpm) will be twice that of the 16g car. Even though a 16g car can make the same peak torque numbers, that torque will never be made as high up in the rpm band as your fp3065 can. This means you can take advantage of gearing and convert all that HP into torque at the wheels, which is the deciding factor in acceleration. Think of it as leverage, with a long handle you can use much more force, but not turn it very quickly. With a short handle you can turn something very quickly but without as much force. What you have is an impact wrench

Here is a very good article to understand this better:
http://www.seight.com/torque.html

Long story short, you have nothing wrong with your setup. It is normal for an engine with the same displacement to have less peak torque than HP as the peak HP rises.