Belize Off Road Team

I was browsing the net for a Prado 90 Series snorkel for my 3.4L.
and on PradoPoint.com some people have dyno'd their 3.4L petrol prados!

and the numbers are shockingly low! What would cause such low low numbers on a 5VZ-FE???


Quote Grande:
Hi everyone,

Today I decided to have my Prado run through a dyno just to see what stats it pumps out

I plan on doing a few mods to the engine over the next 12 months or so. A base figure to start from will make for interesting info later on to see what mods make any real difference.

I also hope to put to bed any backyard arguments about what mod does what best, when I run further dynos and see for myself.

The Truck:
1999 VX Grande Prado, auto, 3400cc V6 petrol 5VZ-FE engine, stock standard with 125,000kms and all services since new. Recent service changed all oils and filters (stock standard parts). Spark plugs are due soon. Bridgestone Dueller 694 AT tyres at 40psi. Truck would be described as in excellent condition. I have owned it for 18 months and I'm its second owner. No accesories except for a GME UHF radio...no bar work or lift kits etc....all stock.

The Dyno Set Up:
In all wheel drive (what you use everyday). In auto 3rd gear with overdrive turned of and auto 2nd gear (only when the tranny decided to kick down from 3rd to 2nd on some of the runs. So the engineer slotted it in 2nd). Three 'runs' from stationary (0 rpm) to redline (5,500rpm).

Results:
Max power 71kw, somewhere over 4,000rpm (95 horsie's) at rear wheels (I wanted to see over 100 horsie's)
Max torque 260 nm (around 3,000rpm) at rear wheels
Air:Fuel Ratio approx 11.5:1 (very rich). No wonder I chew petrol.

Summary:
Well, I'm a bit disappointed, but amazed that so few kw and nm can still get the truck around town and in the bush so well.....also, the figures in the books you read are not real!

Having read the figures such as 132kw and 303nm for the 5VZ-FE, I didn't think 'real life' figures would be so far of. Obviously new engines tested at the factory are not hooked up to the rest of the car, hence the great looking figures. The rich mixture is because of the Toyota factory settings designed to always keep the engine from running too lean and reducing reliability. It's a 'safe' figure for a massed produced car (yep...white goods on wheels!).

TexanTaco

That does seem awfully low, but I haven't seen other 5vz dynos to compare that to. So the AWD mode is just the 'normal' driving mode correct? (not 4x4). I wonder if a 2wd truck would put down more power to the wheels? (less drivetrain loss??)

Belize Off Road Team

i don't know, maybe the kw is really more HP just in australlia it is different measurment??? Cause my 3.0 puts out 125HP at the wheels!

gilby4runner

Why does he drive in all wheel drive all the time? If thats the case then the numbers will be lower. (correct me if i am wrong)

Mason Dixon

anyway to get a leaner mix?

mt_goat

Those rpms seem pretty low for a dyno test.

mastacox

Well his numbers don't jive that's for sure. If he's making 260 N-m at 3000 rpm, that means he's making 81 kW (110 hp) there. Running in AWD could be one reason his numbers were so low...

Most dynos I've seen show around 130-140hp to the wheels, like this one:
http://www.f5air.com/images/dyno/04%20tacoma%20v6.GIF

He doesn't seem to have any experience with dynos either because:

1) You run it in second or third gear all the way, don't let it down shift.
2) Of course the numbers for a chassis dyno are lower than an engine dyno, its called drivetrain losses.
3) The engine gets peak horsepower at full throttle around 12.0:1 AFR, that's why its running rich.
4) "Stationary" is not 0 rpm, its idle. And when you floor it in an auto the troque converter is unlocked, so I would guess he was at about 2000rpm.

Ron Helmuth

You ever driven one of those Runners with the All Wheel Drive all the time?

They are dog slow, yes TexanTaco has it right, that is drivetrain loss.

Take a dyno test at the crank-likely the engine is right there with all the other 3.4s.

Belize Off Road Team

See that's what i thought, cause those are really low numbers for the 3.4L

Cause if the 3.4L only puts out 10 more HP than my 3.0 right now, why bother.

apalmer1

yeah even with a rwd m/t model toyota still has horrible suspension for controlling drivetrain loss and axlewrap. ive seen trucks with 5VZ's in town here that gained loads of whp just from doing frame reinforcements and much bigger leaf packs to keep the rear axle from wobbling around. I know when i added my frame reinforcements and switched to the allpro leafs i immediately noticed a huge difference in acceleration and controll.

mastacox

Prados are coil/link suspension like a 4Runner.

Belize Off Road Team

That's why i am looking for a snorkel from a Prado, cause they are a modified 4Runner like the FJC is also a modified 4Runner/Prado. They are similar but different. What i like is that the petrol motors are still used rather than diesel only. Gives me a good way to have a unique snorkel on a 2nd gen 4Runner.

Texas_Ace

I see a few reasons why the numbers are so low.

1: the runs were done is AWD, that right there will take it down by 20% - 30%

2: the runs were done in 2nd gear, and apperantly it was switching gears during the run. That will totally screw up the readings. the runs need to be done in 3rd gear and NEVER change gears during the run.

3: as said above the numbers don't match up, my guess is that is due to the wrong gear being used or the dyno was messed up.

From what i have seen, 130 - 150hp at the rear wheels is normal for a good running 5vz with stock tires. bigger tires will also lower the numbers.

Belize Off Road Team

if the 5VZ-FE only gets around 150hp, how much does it achieve at the wheels with a S/C???

mastacox

Supercharged 5VZ-FE's with the URD fuel upgrade kit and 2.2" pulley generally put down about 240 whp.

mt_goat

TRDOLDMAN over on TTORA got his Taco slightly over 300 RWHP. He was running a URD 2.0" pulley with a TRD 7th injector, Aquamist water/meth injecton, and headers with no cats.