scubagai
Observer
Hello all. Been a while since I've been on here. I live in Northern California and have a 1992 Fuso FG439 with the 4D34T3 motor. The US spec one is turboed, and comes with a Zexel MD(Bosch inline prestroke control injection pump), and has an exhaust brake. We are all aware that these are torquey machines, detuned, and mated with stout running gear to let these trucks run for a million miles. Mine has 100,000 easy miles on it. I have no intention of driving it 900,000 more miles. I would like to drive another 150k to 200k on a slightly peppier motor. I am not looking for massive black smoke churning horse power/torque gains, however, I would like to get out of my own way going up grade, and be able to pass other "slower" vehicles on grade. I am not looking to do anything that would hugely effect engine longevity or fuel economy, but do realize that these are tradeoffs with making more power. I am ok with top speed of 62, i just want something left when passing.
Currently, I have 285/75/16 Hankook Mud terrains on 16" Marsh racing singles. These seem to help keep rpms down once at highway speed. I have a s280 communications shelter mounted on the back, which sticks above the cab about 18". So, I have a brick that i would like to throw more fuel at. I am not looking to be talked out of power mods. I would appreciate only positive responses from those that have information about producing more power out of these motors. I drive a 12 valve cummins(turboed/intercooled) on a daily basis, and a wrx, neither of which is hopped up too much. Fuel screw turned on cummins and cobb running stage 1 map on wrx. I am not throttle masher either. I have researched this subject via all types of forums, but most are inadequate at explaining it(plus most seem to be for swaps into landcruisers).
Ok, so the questions: How do I get more power out of this motor?
(The following are my current thoughts)
Air and fuel
I am planning on a 3" exhaust with a high flow muffler. However, I would like to remove the stock exhaust brake and find a 3" one to replace it. Any ideas where to source that?
I am planning on modifying the air intake...how, I don't know, but I would like less restricitve flow.
I am willing to purchase a turbo upgrade, if needed.
I am willing to have the pump tuned, if this is effective.(I have heard there is a shop in Redding, CA that does good pump tuning).
All of your positive comments and assistance are much appreciated.....you people from Oz probably have the most experience with this.
Currently, I have 285/75/16 Hankook Mud terrains on 16" Marsh racing singles. These seem to help keep rpms down once at highway speed. I have a s280 communications shelter mounted on the back, which sticks above the cab about 18". So, I have a brick that i would like to throw more fuel at. I am not looking to be talked out of power mods. I would appreciate only positive responses from those that have information about producing more power out of these motors. I drive a 12 valve cummins(turboed/intercooled) on a daily basis, and a wrx, neither of which is hopped up too much. Fuel screw turned on cummins and cobb running stage 1 map on wrx. I am not throttle masher either. I have researched this subject via all types of forums, but most are inadequate at explaining it(plus most seem to be for swaps into landcruisers).
Ok, so the questions: How do I get more power out of this motor?
(The following are my current thoughts)
Air and fuel
I am planning on a 3" exhaust with a high flow muffler. However, I would like to remove the stock exhaust brake and find a 3" one to replace it. Any ideas where to source that?
I am planning on modifying the air intake...how, I don't know, but I would like less restricitve flow.
I am willing to purchase a turbo upgrade, if needed.
I am willing to have the pump tuned, if this is effective.(I have heard there is a shop in Redding, CA that does good pump tuning).
All of your positive comments and assistance are much appreciated.....you people from Oz probably have the most experience with this.
Last edited: