This is The Bomb ... with Turbo!
Moderators: plenzen, Nissan_Ranger
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- Posts: 4
- Joined: 12 years ago
- Location: Cent. Cal.
I haven't studied the throttle body very much yet. I've just owned my 720 for a couple of weeks.
But from what I know it isn't much of a restriction. There is a vaccum amplifier that works the fuel pump. I think there is a very slight vaccum from the throttle body that operates the diaphram in the pump via the amplifier. I think the engine see's very little vaccum. That's why there is a vaccum pump on the alternator.
The 720 diesel performs pretty well all considered.
It is too bad the pistons are prone to cracking because I'm sure you could have some fun with turbocharging and intercooling.
I got lots of power out of a SD33T with turbo mods and intercooling - but I don't consider it nearly as reliable as the mighty Cummins 3.9 or 5.9.
I replaced the SD33T in my scout with a 5.9 Cummins and it has more power than is safe.
Now I'm back to driving a slow reliable fuel efficient 30+ year old stock truck.......
The 25mpg I get in my Scout just isn't good enough anymore.
But from what I know it isn't much of a restriction. There is a vaccum amplifier that works the fuel pump. I think there is a very slight vaccum from the throttle body that operates the diaphram in the pump via the amplifier. I think the engine see's very little vaccum. That's why there is a vaccum pump on the alternator.
The 720 diesel performs pretty well all considered.
It is too bad the pistons are prone to cracking because I'm sure you could have some fun with turbocharging and intercooling.
I got lots of power out of a SD33T with turbo mods and intercooling - but I don't consider it nearly as reliable as the mighty Cummins 3.9 or 5.9.
I replaced the SD33T in my scout with a 5.9 Cummins and it has more power than is safe.
Now I'm back to driving a slow reliable fuel efficient 30+ year old stock truck.......
The 25mpg I get in my Scout just isn't good enough anymore.
82 720 Diesel
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- Posts: 19
- Joined: 12 years ago
Only 35mpg hwy? I dont know what mine got hwy, but in town I had no problem getting 45mpg, and that was with the (previous owner set up) IP well into the "huge clouds of black smoke" territory and a lead foot.
Compared to a gas engine, it's true the sd22 produces little vacuum, not near enough for power brakes. But the TB is still causing SOME vacuum, and I just feel like a diesel shouldnt have a throttle!
Anyone here volunteer to measure their manifold vacuum under actual load conditions? I'd do it, if my 720 had a working transmission in it...
If that throttle blade is even partially closed at part load, it's a restriction, and combustion would proceed more efficiently with more air I would think. Others on this forum have claimed decreases in EGT by removing the TB.
Personally, I find the way the engine responds to the pedal to be annoying. It's almost like driving with a speed governor, if you push the pedal 1/3 of the way down, the engine blasts off at full fuel until it hits roughly 1/3 max rpm, then it slams into a wall. Driving without a smoke screen involves gradually pushing the pedal further as it accelerates, and it's impossible to do at night when you cant look for the smoke screen in the mirror! I just want a torque demand pedal dangit! My 83 chevette diesel doesnt use a throttle or crazy vacuum diaphragm system, and it drives just like a gas car (except VERY frikken slow.... 0-60 over 25 seconds...)
Compared to a gas engine, it's true the sd22 produces little vacuum, not near enough for power brakes. But the TB is still causing SOME vacuum, and I just feel like a diesel shouldnt have a throttle!
Anyone here volunteer to measure their manifold vacuum under actual load conditions? I'd do it, if my 720 had a working transmission in it...
If that throttle blade is even partially closed at part load, it's a restriction, and combustion would proceed more efficiently with more air I would think. Others on this forum have claimed decreases in EGT by removing the TB.
Personally, I find the way the engine responds to the pedal to be annoying. It's almost like driving with a speed governor, if you push the pedal 1/3 of the way down, the engine blasts off at full fuel until it hits roughly 1/3 max rpm, then it slams into a wall. Driving without a smoke screen involves gradually pushing the pedal further as it accelerates, and it's impossible to do at night when you cant look for the smoke screen in the mirror! I just want a torque demand pedal dangit! My 83 chevette diesel doesnt use a throttle or crazy vacuum diaphragm system, and it drives just like a gas car (except VERY frikken slow.... 0-60 over 25 seconds...)
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- Posts: 271
- Joined: 17 years ago
- Location: Canada
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- Posts: 19
- Joined: 12 years ago
Sorry yes, imperial. To be fair, I was utilizing some mild hypermiling techniques, namely pulse and glide (coasting), to boost my mileage. Speeds were 30-50mph. But i wasnt too kind to it when I was accelerating, other than keeping revs fairly low. Was mostly night driving, couldnt see the smokometer.
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- Posts: 59
- Joined: 12 years ago
- Location: Portugal
Sd22 with turbo and Power?! with inline pump? is here
See the +2Bar boost!
http://youtu.be/1uT5UFzC1bc
See the +2Bar boost!
http://youtu.be/1uT5UFzC1bc
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- Posts: 59
- Joined: 12 years ago
- Location: Portugal
I dont understand what you say, please say with another words
specs http://nissandiesel.dyndns.org/viewtopic.php?t=2968
specs http://nissandiesel.dyndns.org/viewtopic.php?t=2968
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- Posts: 271
- Joined: 17 years ago
- Location: Canada
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- Posts: 59
- Joined: 12 years ago
- Location: Portugal
I buy a reforced headgasket, i can show you... have 2.20mm
http://sphotos-e.ak.fbcdn.net/hphotos-a ... 2219_n.jpg
And in this sunday, 4NOV, the truck rooled all day, with no problems, just 3 laps and stop to put some water in radiator's, a go again... the temp, arround 90º/110º, with 2 bar boost...
You can see it in this movies:
http://youtu.be/kfEchaVm704
http://youtu.be/8SfaHaDGB7M
http://sphotos-e.ak.fbcdn.net/hphotos-a ... 2219_n.jpg
And in this sunday, 4NOV, the truck rooled all day, with no problems, just 3 laps and stop to put some water in radiator's, a go again... the temp, arround 90º/110º, with 2 bar boost...
You can see it in this movies:
http://youtu.be/kfEchaVm704
http://youtu.be/8SfaHaDGB7M
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