SnowLizard
New member
I'm more like AZbub, 14 gal's when the light turns on, but using the scan-guage I go till I have about 50 miles left on the tank.
NOTE ME!!! said:The concept behind drone is pretty simple; nearly everything has a resonant frequency...exhaust systems, electronic RLC circuits, even gravitation has resonance. At peak resonance, the amplitude of the wave at the resonant frequency shoots up to many times higher than normal amplitude. With sound resonance, it pops up when a certain frequency emitted from the engine resonates with the exhaust system and muffler to create that nasty in-cab drone. Unfortunately this resonance often has its peak right in the area where you want to cruise, between 55-75mph.
The solution is a 1/4 wave resonator tube. Simply put, it is a small piece of exhaust pipe with a flat capped end welded nearly perpendicular to the exhaust flow post-muffler that serves to take some of the resonant amplitude and shoot it back into the exhaust pipe out of phase with the resonant frequency to bring down the amplitude. If you've ever taken a physics class, this is in the 'standing wave dynamics' chapter. Mufflers are designed to bring down the amplitude or volume of the exhaust note at all RPMs, but they typically can't do anything about resonance. Corsa mufflers have a built-in resonator that works decent, but only with the entire exhaust kit. Sometimes you'll run across a setup that drones at an RPM the Corsa muffler and exhaust wasn't designed to combat, so theres a chance the internal resonator will do little to no good.
Things you need to know to build the resonator:
-RPM that drone occurs at
-Number of cylinders (4runners 6 or 4)
You will also need to know the speed of sound. It varies with temperature, but is generally accepted to be 343m/s.
Say your V6 truck resonates at 1800rpms the loudest. You'll need to find the frequency of the drone. Units here are pulses per second, or Hertz.
f = RPM * pulses/rev * (1/60)
f = 1800 rev/min * 3 pulses/rev * (1/60)
f = 90 pulses/second = 90Hz
At 1800rpms, your V6 fires 3 times per revolution. RPM is in minutes, so divide by 60 to reduce to seconds. Now you need to find the length of the wave at the frequency you just calculated. Wavelength is denoted by lambda (λ), units are meters.
λ = v/f = speed of sound / frequency
λ = (343m/s)/(90Hz)
λ = 3.8111 meters
This gives you the length of a full sound wave. The idea here is to reintroduce a sound wave into the exhaust that is 180° out of phase with your drone frequency. To do this, you build your resonator tube at exactly one-fourth the length of the resonant wave. By the time the sound wave enters the resonator tube, bounces off the end and re-enters the exhaust stream, the amplitude is exactly opposite of the drone frequency and will lower or eliminate the volume of the drone.
Dividing the wavelength by 4 gives you 0.9527m, or about 3.1258 feet (37.51inches). Its long and kind of awkward, but someone who has had to deal with a droning truck on a road trip will likely sacrifice the space to make it fit
The diameter of the tube you'd need is debatable, as I haven't tried different sizes of tubing. When I built mine, I took a shot in the dark and went with 1.75" pipe on my 2.25" exhaust... I assume a larger resonator tube would allow more sound to bounce back and cancel more of the drone noise....
The reason for this is simply the fact that sound waves do not necessarily 'flow' with whatever medium they are travelling in. Sound is a pressure wave, and any obstacle (bends) will return the wave prematurely. To minimize 'obstables' in the resonator tube, the straighter it is, the better it will work. The intent is not to randomly scatter the sound wave as a radius will tend to do, but to send it back to the exhaust precisely when it is needed.
Very interesting; I will have to keep this in mind when I replace my exhaust system.
and if anyone asks....
my trailer hitch with the lift is now 22.5 inches off the ground.
originally 12.75
that's nearly 10 inches (9.75) of a raise... way better departure angle.
now to save for tires and the rest of the armor...
overall, I'm thinking of leaving the lift where it is... with a bumper and armor it will bring the front down and give me that subtle rake that I like... so now all I have to do is go find some trails and test these shocks out!
I was about to ask about this, that's a crazy improvement right there. I never realized how low the stock trailer hitch was without any lift or anything.
The opposite corner is do to the OME 906 springs in the rear. They are side specific springs, on the little paper tag on the spring coil they are labeled. Coil A is a little longer and should be put on the left hand side to compensate for the weight of the gas tank and Coil B is for the rear right.next was the suspension/steering...
so...
all 4 shocks (Bilstein 5100 tundra)
OME rear 906 springs
Toyota OEM inner tie rods
Toyota OEM outer tie rods
sway bar bushings (not links)
Toyota OEM upper ball joints
Toyota OEM lower ball joints (and OEM bolts from dealer it was $10 for all 8, google 'New Twist on Lower Ball Joint failure')
things to know... O'Riely's has the '4wd ball joint adapter set' for rent to press off your ball joint... to press on, use that same set (different adapter) and supply your own flat metal... and google 'upper ball joints the easy way toyota'
make sure to do the rear first if you have adjustable 5100's... I did and I'm glad I did.
don't use the spring compressor that hooks to the sides of the springs.... find the one with a 'horse' shoe design... I think Harbor freight has it... and just buy it.
an air impact on the spring compressor will save you hours of tightening/loosening... I had battery and it died, then used a regular drill... almost died...
HAVE A BUDDY HELP YOU... seriously, work was so much easier and FASTER with a 2nd person...
ok pictures...
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some specs...
before....
Front
driver .... passenger
34.37 ..... 34.5
34.63 ..... 35
rear
after...
front
driver .... passenger
36.37 ..... 36.25
36.25 ..... 36.37
rear
I'm 'level' and what's strange is the 'opposite' corner... but could be tire pressure/angle of tape measure... human error... what ever...
Went camping, slept in the back with the seat down... not bad, it was way more quieter than a tent... until it started to hail/slush/snow on us.
sorry for crappy cell pics... this whole thread is made from my cell phone pics...