Stock Yaris as fast as stock 1982 Z28 Camaro/Trans Am!!

[eric81]

THIS is good stuff. People doing REAL research, and then sharing that information and intelligence with everyone else, and NOT being jerks or idiots about it. I left this website awhile ago because it seemed to be going down the hole, with everyone being grumpy, stuck up, and somehow no one really knew what they were talking about. Thanks to everyone who has taken the time to do real research and not use any name calling or rudeness to make their points.

Also, their is a very large difference in the power curves of a lot of these cars. I noticed I seem to have no power until over 3,000 RPM's, then at about 5,000 (maybe a little higher than that, but not much) until 6,500 where it peaks, the power seems to die off a tad. I mean, it still accelerates, just not as quick as the mid to mid-high range. Maybe it's the CAI, header, and muffler messing with that part, but that is what I noticed. I also drove an '07 WRX STi, and it had PLENTY of power all the way through, with very little loss of power on the bottom end. The SRT4 on the other hand, had no power until well over 3,500 rpm's, then almost too much power to handle the car properly, especially while turning, cornering, or changing lanes. My step dad's '03 Z-28 had lots of power throughout, and was RWD, but not overly so (mostly because of illegal tires on it to keep it stuck to the road) and it was just a tad heavy in corners. Still, I am a fan of the lightness and pure power of the 4 cylinder world. Hence, I have the infamously undersized 1.5L 1nz-fe engine, and it still produces as much power (close to, anyways) as the older 2.0L engines, and even some of the larger older 4 cylinder engines.

[427chev]

Originally Posted by eric81

THIS is good stuff. People doing REAL research, and then sharing that information and intelligence with everyone else, and NOT being jerks or idiots about it. I left this website awhile ago because it seemed to be going down the hole, with everyone being grumpy, stuck up, and somehow no one really knew what they were talking about. Thanks to everyone who has taken the time to do real research and not use any name calling or rudeness to make their points.

Also, their is a very large difference in the power curves of a lot of these cars. I noticed I seem to have no power until over 3,000 RPM's, then at about 5,000 (maybe a little higher than that, but not much) until 6,500 where it peaks, the power seems to die off a tad. I mean, it still accelerates, just not as quick as the mid to mid-high range. Maybe it's the CAI, header, and muffler messing with that part, but that is what I noticed. I also drove an '07 WRX STi, and it had PLENTY of power all the way through, with very little loss of power on the bottom end. The SRT4 on the other hand, had no power until well over 3,500 rpm's, then almost too much power to handle the car properly, especially while turning, cornering, or changing lanes. My step dad's '03 Z-28 had lots of power throughout, and was RWD, but not overly so (mostly because of illegal tires on it to keep it stuck to the road) and it was just a tad heavy in corners. Still, I am a fan of the lightness and pure power of the 4 cylinder world. Hence, I have the infamously undersized 1.5L 1nz-fe engine, and it still produces as much power (close to, anyways) as the older 2.0L engines, and even some of the larger older 4 cylinder engines.

The "amazing" thing about Hale's formula is that is doesn't care about the shape of the power curve, gearing or anything else.

Peak Flywheel HP ~ = (Trap Speed in the quarter mile/234)^3 * Race Weight

I've had a lot of TRULY fast cars and bought this Yaris as a commuter.

I really like the little car.

The stock suspension wasn't for me, so I went with the full dealer-installed TRD suspension. I am VERY impressed with the resulting ride/handing trade-off.

I paid a good upholsterer $125 to (dramatically) improve the stock driver's seat, installed the leather TRD shift knob, a decent stereo with four Infiniti Kappas and called it a day.

I average 35 MPH in mixed driving, stay ahead of anyone who isn't making a dedicated effort to beat me and save $$$ for savings/investing.

You wouldn't believe how BAD some of the hyped cars are. My '07 Acura TL Type S was WAY too soft (springs and dampers) in the front and the hyped Brembo brakes couldn't hold a candle to my Yaris's brakes. The TRD Yaris's suspension represents a vastly superior compromise.

There is beauty in simplicity and headaches in complexity. I know because I've owned lots of both.

My TRD Yaris is the best car I've owned since my '99 1LE Z28 Camaro.

[Yaris Hilton]

Hale's formula doesn't take into account the shape of the power curve. It works well when comparing similar cars, which should have similarly shaped power curves, but average horsepower over the distance is what produces the top end speed. That's a result of average acceleration over the distance.

[427chev]

Originally Posted by Yaris Hilton

Hale's formula doesn't take into account the shape of the power curve. It works well when comparing similar cars, which should have similarly shaped power curves, but average horsepower over the distance is what produces the top end speed. That's a result of average acceleration over the distance.

As illustrated below, the formula works quite well when actual trap speed results are compared against published peak SAE NET peak power figures (preferably Certified SAE NET) - regardless of engine type. If it doesn't then the power rating itself is suspicious [e.g. BMW 335i, which produces more than the claimed (but not SAE certified] 300 HP.

Example 1: Few modern performance passenger car engines are as peaky (and produce less torque) than the Honda S2000's 2.2 liter DOHC 4 cylinder:

http://www.caranddriver.com/reviews/...cs+page-2.html

Curb weight (car with a full tank of gas) is 2,792 pounds, so we'll figure an even 3,000 pounds with a driver and test equipment added. Trap speed was 99 MPH.

Peak Engine HP = (99/234)^3 * 3,000 pounds = 227 HP. Honda rates it at 237 SAE Certified SAE NET HP


Example 2: This new Corvette features a 6.2 liter V8 that offers a very differently shaped power curve (and far more torque) than the Honda S2000's high revving 4 cylinder. Curb weight is 3,299 pounds, so we'll figure an even 3,500 pounds with driver and test equipment. Trap speed was 116 MPH.

http://www.caranddriver.com/content/..._z51_08_ss.pdf

Peak Engine HP = (116/234)^3 * 3,500 pounds = 426 HP. Chevrolet rates it as 436 SAE Certified SAE NET HP.


That phenomenon is attributable to the affect that gearing has on drivewheel torque, relative to vehicle speed. Your point would be more valid if cars didn't use transmissions, but they do. Note: The formula doesn't work as well for large trucks (due to big tires and lots of aero drag) nor was it intended to.