So when i read the specs on the Blazers i see that it makes about 260 foot LBS at 2,800 Rpm so does that mean as the RPM increases so does the torque or is that the maximum torque it produces???

Also how does a new gear ratio give you more torque such as people say they cant peel out with 3.42 gears put with 4.10 Gears they can easily do it i dont get it please explain



Thanks


Jared.

 

Engines have a power band. The power band is the RPM range in which the engine produces the most power/hp...whatever youre going for. The engines are tuned to give you a peak at some point. The reason these trucks are so nice is that all their torque is available so low. The best graphs I could find to show you are from Magnaflow. The darker line is stock, the higher line is supposedly with the magnaflow exhaust..



The bottom two lines show you how torque is at peak before 3000 rpm (the graph only shows the high end because thats when the exhaust helps the most). Then torque and power dramatically drop off. The max torque on these engines is right at 2200-2800 rpm.

Compare this to the old blazer engine, the 2.2L 4-banger

See how as the engine RPM continues increasing, torque/power continue as well. The peak on this engine is about 5000 rpm. This is what most people assume all engines are, but most trucks and SUVs have their power down low to help with towing and hauling and other truck-ly things

Make sense?

Edits: 1) the first graph is chopped so low to make the magnaflow system look much better. You can see the max of 260 torque isnt even on the graph...apparently the exhaust system just lets you maintain peak torque longer, so the graph looks like a HUGE gain...but its not and 2) wow the 2.2s are ridiculously weak..

 

As for gears..you can peel out with 4.10s much easier than 3.42s, because thats what gears are for! A 4.10 gear ratio means that 4.10 revolution of the drive shaft gives you 1 revolution of the wheel. So the high numbered gears (which are read LOWER gear ratios) give you more power to the wheels at any given speed.

The problem comes in that 4.10 gears make you have much higher RPMs at higher speeds. Based on your tire size, you'll have an optimal gear ratio to give you the most power while stayin in the power band of the engine

 

that's because they're not v6's, there 4 cylinders. Cavalier block with a different top end.

 

ahhhh youre right. I was thinking the 2.8l v6s the 1st gens came with..not the 4-banger s10s! Thanks for the correction, edited in the post

 

Ok awesome thanks it makes perfect sense.

Hmmm i wish the 5.3L engines had there torque this low they are a very powerful engine but they dont make peak power until about 4500 RPM nobody drives at that rpm. And we defenitly couldnt launch at that RPM we would have No traction and kiss the tranny goodbye. Lol.