"Horsepower & Torque Rating"

Hey Everybody out there in Tacoma World,

How is everybody doing this morning? On the Toyota 5VZ-FE 3.4, does anybody know where on the truck or the engine that Toyota rated the engine for horsepower and torque? I know the manual says the engine has 190 horsepower and 220 foot pounds of torque, but it does not say where Toyota got these numbers from.

Thank you,
Paul

 

That would just be the estimate from Factory after break in period I believe. I think after about 10 years you lose a few ponies and TQ numbers. Here is a good article from Car and Driver back in 2006 https://www.caranddriver.com/columns/larry-webster-horsepower-confusion-and-resolution-column

 

It's at the wheel. Unless you're looking at a stand alone engine all specs have to be taken with all the parasitic losses in place. And the number is basically an average and not a guarantee.

 

I don't remember who but I heard it was 190 HP at the crank, and you actually wind up with around 140 HP at the wheels.

 

That would depend on whether it was an automatic or manual and what rear gears you have as well as tire size all of which are subject to change. But I do believe 190 at the crank is correct

 

True. The tire size on our trucks matters as parasitic no? And not to mention trucks at least like my double cab are close to 17' long and that makes for a longer driveshaft. I figure one could safely apply the 20-25% parasitic loss to these trucks.

 

Measured at the crank

 

Advertised numbers are always at the crank unless it's specified 'at the wheels'.

1) it gives the highest number possible.

2) it removes other variables (driveline) from the end result

3) as long as compression is still high and equal-ish and the engine is still in good tune, there should be no significant loss over new

 

I can tell you with 100% confidence, that my truck's performance got better than when it was brand-new at around 40,000 miles and stayed that way since. It has around 137,000 miles now. Who knows, it could be how our beloved 3.4s are built to tight tolerances and start "loosening up" late. But I clearly recall this.

 

Hey Everybody,

Thanks to all of you that responded. If any of you were here at the bar I am at right now, I would buy you all of you a couple round of drinks. The only catch is that one of you would have to write a note to my ball and chain explaining to her why I am going to be home late tonight.

Okay, this is what I learned today from all of you and from the research I have done. Before 1972, manufacturers rated the horsepower of their engines from the crank without any auxiliary devices like alternators, power steering pumps or air-conditioning compressors installed as well as without any exhaust installed. This method of rating horsepower is commonly referred to as Gross Horsepower, and this was done by hooking up the engine to a machine. After 1972, horsepower was still measured at the crank, but this time, however, everything was installed except for the transmission. This method of rating horsepower is called Net Horsepower, and it is how manufacturers today rate the horsepower of their engines.

Of course, today things are a way more accurate than they were back then especially with the advent of computer technology. For those or you out there that are horsepower purists, there is always a dynometer to tell you exactly how much horsepower is being transferred to the rear wheels of your Tacomas.

Take it easy,
Paul

 

If your looking at hp numbers, the supercharger is the way to go. Once you get it tuned correctly It will last you the life of the engine and longer with regular rebuilds every 150,000 miles with dependable power.
You lose plus or minus 20-25 percent hp from your engine to the rear wheel. The stock 3.4 as mentioned here puts out around 140hp and probably 170 torque at the rear wheel, Superchargered you can get 240-250hp and 270-280 torque at the rear wheel. So keep that as an option if you want more power and the feeling of a completely different truck. My supercharger has 550,000 miles on it as a daily driver and still running strong with its scheduled 150,000 mile supercharger rebuilt.

EDIT 2020 Oct.

Running a smaller pulley 1.9” headers, dual exhaust, ported supercharger
= 13 pounds of boost at 4800 feet = 300 rear wheel hp, torque 320,

 

Something like that, it's the difference between hp rating of the vehicle and the hp rating of the engine. The number at the wheels have gotten a lot better over the years as transmissions have improved but its still quiteaching a bit. 15% is the general rule of thumb but it's usually a bit higher. Figure 160ish for a 2.7 bUT ymmv.

 

Yes correct, depending on each truck setup, I looked up the rear stock dyno runs for a stock 3.4
and found them on the low end at 122hp rear wheel hp to 142hp rear wheel, a 25 percent loss or more. Of course age, miles, etc will vary.

This guy got 142hp with a flowmaster exhaust, deck plate mod and Amsoil filter
And this other post shows 122hp on astock 3.4, if you turbo the 3.4 you can get
350hp at the rear wheel but that's a complicated process as there are no true bolt in turbo kits at 3.4

 

Amount of horsepower and torque not as important, to me at least, as where in the revs it is produced.

 

That mortgage rate tho

 

This

 

I had 190 on my head for the 2.7, guess it was the 3.4. I'd expect better numbers. I knew the 2.7 was anemic but geezer

 

well that's depressing. My bike only puts out 35 less horsepower than that. Like going from a Lada to a Ferrari.

 

Haha, but what type torque does that bike have?

 

51 ft-lbs






something something something something torque to weight ratio something something something