advice on building 95 4runner v6 3.0L
- Thread starter Bubz28
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
You heard incorrectly.
Most Harley exhausts do more damage to the usable power band than good.
As much as Harleys have anything that could be called a power band.
Most Harley exhausts do more damage to the usable power band than good.
As much as Harleys have anything that could be called a power band.
Bogo
FOOF
Ive heard thats a myth on gassers....
It isn't. Calling it back pressure really isn't right. What is needed is the proper sizing of the exhaust pipe so exhaust gas flow speed is maintained. With high enough exhaust gas flow speeds in the manifold, a small amount of vacuum is generated behind the previous exhaust puff from the cylinder. This all comes from conservation of momentum, a fundamental law of nature. That small vacuum helps pull out the next exhaust puff. Make the exhaust pipe to large and the exhaust gas flow speed is not there to generate the vacuum so the exhaust gas flow stalls and performance suffers because the next puff of exhaust has to push the previous one out of the way. The energy in the exhaust gases varies by the square of its speed, so keeping it moving faster allows for greater vacuum to be generated. Of course this is all exhaust gas volume dependent which is dependent on RPM. An exhaust system that provides optimal low RPM power is usually to small for optimal high RPM power because it starts to provide to much resistance, "back pressure", at greater flow volumes. Engnbldr didn't mention it, but I bet adding 1/4" pipe diameter after the catalytic converter and 1/2" after the muffler would likely free up a couple ponies, but that is it. It would only be worth it when the exhaust system needs replacement. Is it worth the extra cost? I'd have to have somebody custom bend the pipes. On the other hand I can order stock parts, have them shipped to the farm, and do the exhaust system repair myself.
It isn't. Calling it back pressure really isn't right. What is needed is the proper sizing of the exhaust pipe so exhaust gas flow speed is maintained. With high enough exhaust gas flow speeds in the manifold, a small amount of vacuum is generated behind the previous exhaust puff from the cylinder. This all comes from conservation of momentum, a fundamental law of nature. That small vacuum helps pull out the next exhaust puff. Make the exhaust pipe to large and the exhaust gas flow speed is not there to generate the vacuum so the exhaust gas flow stalls and performance suffers because the next puff of exhaust has to push the previous one out of the way. The energy in the exhaust gases varies by the square of its speed, so keeping it moving faster allows for greater vacuum to be generated. Of course this is all exhaust gas volume dependent which is dependent on RPM. An exhaust system that provides optimal low RPM power is usually to small for optimal high RPM power because it starts to provide to much resistance, "back pressure", at greater flow volumes. Engnbldr didn't mention it, but I bet adding 1/4" pipe diameter after the catalytic converter and 1/2" after the muffler would likely free up a couple ponies, but that is it. It would only be worth it when the exhaust system needs replacement. Is it worth the extra cost? I'd have to have somebody custom bend the pipes. On the other hand I can order stock parts, have them shipped to the farm, and do the exhaust system repair myself.
hmm...that makes sense.
Jeez, you will anything to segue to an anti harley rant....nicely done.
ROFLMFAO!!!
well said.
x2 on what combat chuck said.
drive the crap out of the 3.slow till it blows up(which it will)
then put a 3.4 v6 or 7mge in it, of course you will need a sas for the 7mge swap.
Not enough can be said about gears lockers and armor.
so unless your gonna do a sas dont waste any money on the suspension. bare minimul, ball joint spacers up front, fj80 coils in the rearwill perform the best and be the easiest on the wallet.
then you can have plenty of funds left for the important stuff, armor gears and lockers.
Remember if you wheel hard your gonna go through idler arms and alignments like crazy.
by the time the 3.slow craps out you will be ready for a sas and a supra motor.
Last edited:
