[Z06] Why more hp than tq on Z06's/modded LS1 C5's????
09-08-2002, 09:17 PM
#1
Drifting
Thread Starter
Why more hp than tq on Z06's/modded LS1 C5's????
Most of the dyno numbers i see for Z06's and modded LS1 C5's show more hp than tq. Why is that :confused: I know it is a TOTALLY different motor, but my car is rated(when STOCK) at 275hp and 325tq. Now, it is probably 305-315hp and 335-340tq(at the flywheel). How come LS-1/LS-6's are the opposite :confused: Thanks in advance!! :cheers: :seeya :chevy
09-08-2002, 09:59 PM
#2
Burning Brakes
Re: Why more hp than tq on Z06's/modded LS1 C5's???? (LT1pwrd'94)
Generic HP calc: (TQ x RPMs)/5250
The LS cars (and LT5) make significant TQ above 5250rpms--they breath and have the valvetrain to support higher RPMs than the LT1/4s (for the most part).
The LS cars (and LT5) make significant TQ above 5250rpms--they breath and have the valvetrain to support higher RPMs than the LT1/4s (for the most part).
09-09-2002, 12:48 AM
#3
Drifting
Thread Starter
Re: Why more hp than tq on Z06's/modded LS1 C5's???? (Demps)
Demps,
:confused: Is that explaining why LS1/6's(LT5's) have more hp than tq and i am not not understanding it?? :confused:
09-09-2002, 12:55 AM
#4
Drifting
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Re: Why more hp than tq on Z06's/modded LS1 C5's???? (LT1pwrd'94)
LT, I am sure it has a lot to do with cam profiles.....and possibly even the TQ limit set @ 350, from GM........in the PCM program...........the former I suspect first..... :D
09-09-2002, 02:02 AM
#5
Burning Brakes
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Re: Why more hp than tq on Z06's/modded LS1 C5's???? (ZO6LS6)
Since HP is a calculated number ft-lbs * RPM / 5250 (in other words, 300 ft-lbs of torque at 5250 = 300hp), the ratio of max torque to max hp all depends on the design of the engine. While the stock LS1 has more max torque than HP, the stock LS6 is the reverse because it is a higher reving engine with a power peak at 6000 rpm (mine is actually 6250 according to dynojet runs).
Basically, some characteristics of an engine can promote more lower end torque but those same characteristics usually restrict breathing at high rpm. It is a tradeoff. If you are building a racing engine, like a Winston cup small block, torque is less important than the breathing the engine will be able to accomplish as it revs from 6000 to 9000 rpm (race power band).
If you are building a daily driver, you're better off getting some strong torque in the 2000-4000 rpm range where most daily driving occurs. Since the LS1 is meant to be more well rounded, it gives up some high end power for a BROAD torque curve that makes the cars pull nicely around town. An LS6 on the other hand is all about building an engine for max output so a higher redline/torque peak was better to accomplish that goal. When people mod an LS1, they are usually going after more peak hp which is usually accomplished by tuning the engine to more of a max hp bias.
Hope that helps.
[Modified by Bertrand, 1:02 AM 9/9/2002]
Basically, some characteristics of an engine can promote more lower end torque but those same characteristics usually restrict breathing at high rpm. It is a tradeoff. If you are building a racing engine, like a Winston cup small block, torque is less important than the breathing the engine will be able to accomplish as it revs from 6000 to 9000 rpm (race power band).
If you are building a daily driver, you're better off getting some strong torque in the 2000-4000 rpm range where most daily driving occurs. Since the LS1 is meant to be more well rounded, it gives up some high end power for a BROAD torque curve that makes the cars pull nicely around town. An LS6 on the other hand is all about building an engine for max output so a higher redline/torque peak was better to accomplish that goal. When people mod an LS1, they are usually going after more peak hp which is usually accomplished by tuning the engine to more of a max hp bias.
Hope that helps.
[Modified by Bertrand, 1:02 AM 9/9/2002]
