ty_ty13

iTrader: (42)

I have been wondering this for a while...
what good is low end torque ie. 0-3xxx rpms?
if you have gears you should very rarely see these kinda rpms so what is the big "hoopla" about the low end torque?

M6's launch over 3000 rpms
A4's have converters....

i just dont understand ... can some one please inform me.

TIA



Tyler

yak

iTrader: (15)

well some people drive their car daily like myself. I like to be thrown into the seat regaurdless of what rpm my engine is at.

rufretic

iTrader: (37)

I agree, who cares about torque below 3000rpms? I know I don't. The only thing I can think of is for just regular driving. It doesn't really make sense though because if I want to go faster I give it more gas, if I don't want to go fast it doesn't matter what my torque is.

P Mack

iTrader: (6)

I care about torque below 3000 rpm because 95% of my driving is there. If I really want to haul *** I'll downshift but when i'm just cruising i like some grunt at 2000 rpm in 6th.

SouthFL.02.SS

Low end tq is fun, plain and simple. I remember my buddy punching it in his brand new '89 5.7L IROC-Z. The thing would kick you back in your seat right away. Didn't matter that the engine couldn't breathe past 4500rpm, it felt fast getting there.

DaddySS

For mostly daily or pleasure driven cars, low end torque is critical to SOP fun!!!!

soundengineer

iTrader: (16)

low end torque is required for being able to break the tires loose in 5th gear on the highway as the ricer decides to show off next to you...
so you leave it in 5th and just put your foot down and show him what a real engine can do....

2.0 liters...LOL.... I drink more beer than that on saturday night

equandt

iTrader: (2)

I rarely leave from a stop light at 3000 rpm. I usually leave from the stop light around 1100 rpm. Off idle to 3000 rpm torque is where it's at on the street.

Mash the gas, smoke the tires (no shifting) requires torque.

Torque is king on the street. HP rules at the track.

PREDATOR-Z

Well, I dunno. How you use your Trq & HP is how you design it (combo).
Personaly I like a high trq motor, problem is "hooking" on the street. Most challenges are from a roll, so I would say to favor more hp for the street and more trq at the track.

Vertigo

iTrader: (1)

As the old addigy goes Horsepower sells cars, Torque wins races. As for myself, Im guilty of wanting low-end torque. The main reason I ask about this many times is because lately I've been thinking about getting my car cammed. And from what I understand the bigger the cam is that you get...you will loose low-end torque by the masses and gain it back and then some after 3,500rpm. This is why the 01` and 02` went to the vortec cam to improve low-end. In the end all I want is a cam that will peak torque around 2500-3000rpm and maintain it all the way to 5500rpm with the HP maxing out around 5500-6000rpm. If i can find a bigger cam with about 75hp/tq - 100hp/tq gains with the above stats, I would be in love
Suggestions welcome.....

99ZEOD

iTrader: (5)

Take a look at this. Believe me, it's got power down low. Mods in sig.

rufretic

iTrader: (37)

Looks to me like the low end torque is more for the M6 guys. That makes more sense because for me high rpms are just a pedal away no matter what gear I'm in or what speed I'm going. Man I love my torque converter.

Tranzor

low end torque is good if you want to pull a boat... but in that case, a diesel truck will serve you better than an LS1 f-body. A nice torque curve is more important than the actual low end numbers.

When I race, I'm dumping the clutch at over 5k rpms anyways... so I don't give a crap about torque from 0 rpms to 3k rpms. And if I ever go for a pull on the street, it's from a roll... because with my gears and power, 1st gear is pretty much useless at anything past half throttle anyhow.

soundengineer

iTrader: (16)

technically the saying that torque gets you off the line and horsepower wins the race is wrong.....

Horsepower is a direct math function of torque and rpm.... so technically torque wins the race...

HP = (TQ x RPM)/5252 (also the reason why all TQ/HP curves cross at 5252)

so its always torque that you want....and higher torque at higher rpms = more HP by the math

on the street the flatter the torque curve...the more fun the car is usually...which means you need more low end torque....

Vertigo

iTrader: (1)

Exactly what i said above...

87GN&98VET

Think of the C5Rs. Those cars beat everyone out of a turn because of the low end torque the big 7.0L produces. They don't rev to high but they sure win a lot of races.

Another_User

Low-end torque is more fun. Thats why I have a hotcam. Low-end torque can be bad if it causes you to fry the tires...there is always a comfortable in-between though.

Tranzor

I would be shocked if those guys came out of a turn at less than 3k rpms, which is what people here are considering "low end torque".

Cal

iTrader: (1)

The fact is, the way LSx engines are designed, they produce very good power through the entire rpm range, even at the lower rpms. Most of the cams that are available don't reduce low rpm torque or power enough to worry about. But the midrange and high rpm gains can be quite significant.

I believe the exceptional low rpm power of these engines is a product of their long-runner intake manifold, smaller bore and longer stroke, and longer connecting rods. All of this is relative to the old SBC design of same displacement.

The short answer is, with a cam duration in the 230's, you're not going to loose enough low rpm response to worry about, but you stand to gain a lot on the high end.

TheBowtieboy

iTrader: (6)

Interesting responses......

Lower end torque is utilized in both autocross and road racing.

In these sports, your goal is to be smooth to keep from upsetting the balance of the car. To help this, low end torque helps sustain speeds in corners while allowing one to "squirt" out of a corner quicker without "rowing" the transmission.

Another aspect related to these two sports is that you're not always in the upper RPM range, this is to help the longevity and heat soaking of the engine.

.....these sports are more of an art then one might first think.

Now as stated by quite a few above - 1/4 mile is more about the higher RPM range.