@Workhorse, did you play around with your tune this weekend? Any progress?
The Official 1HD-T/FT Fuel Pump Mod Tuning Thread (14 Viewers)
- Thread starter ForealBoreal
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Hey Rock,
I upped the boost about one revolution on my Turbosmart boost controller so it currently maxes out at about 18.5PSI. It feels a bit more alive and I believe I need to add more fuel. Not a whole lot but I will have to play with it. My EGT's on an on ramp onto an Interstate will NOT go over 950F with the pedal to the floor. The truck almost feels a bit starved for fuel. I might turn up the boost to an even 20PSI but I want to add more fuel before I do that to see if that makes the difference.
The off boost smoke at idle is pretty heavy until it warms up as we have all stated. Even then it stinks pretty bad. By the way, my HDFT is Non-EGR from the Factory and I removed the glow screen when I added my Safari IC. I recall @roscoFJ73 mentioning somewhere awhile back that "if you want a smoke free and not so stinky Toyota diesel, get an HDFT-E".
I upped the boost about one revolution on my Turbosmart boost controller so it currently maxes out at about 18.5PSI. It feels a bit more alive and I believe I need to add more fuel. Not a whole lot but I will have to play with it. My EGT's on an on ramp onto an Interstate will NOT go over 950F with the pedal to the floor. The truck almost feels a bit starved for fuel. I might turn up the boost to an even 20PSI but I want to add more fuel before I do that to see if that makes the difference.
The off boost smoke at idle is pretty heavy until it warms up as we have all stated. Even then it stinks pretty bad. By the way, my HDFT is Non-EGR from the Factory and I removed the glow screen when I added my Safari IC. I recall @roscoFJ73 mentioning somewhere awhile back that "if you want a smoke free and not so stinky Toyota diesel, get an HDFT-E".
@Workhorse, yeah, I’d definitely add some more fuel and see what happens. Have fun with it!
Ill chime in on my FT in regards to smoke and smell. As a precursor, ~195k on the bottom end, has a fresh head job, rebuilt injectors and pump checked out with injectors and given a clean bill of health. I have a fairly conservative tune, stock turbo limited at 14psi. I live in socal so my glow screen has been disconnected, recently its been cold for our standards around 32F. Starts almost immediately at that temp, noticeable puff of smoke, clears up within seconds. No smoke visible during acceleration. As for the smell, definitely stinky, I cannot idle it in the garage with the garage door open without my wife yelling obscenities from inside the house.
On wheeling trips, people hate following me because of the smell, so I am always last, although its not bad enough for it to be noticeable in the cab. When at elevation, it is especially bad, which is explainable due to lack of air and no computer to adjust fuel accordingly. I have an AFR gauge, at elevation it shows about 25 parts richer then at sea level at idle.
It makes me feel better that others are experiencing similar symptoms, like someone else has stated, these are old diesels with non of the foo foo things on it to reduce emissions, but i am more then happy to stinky along getting my 22mpg.
On wheeling trips, people hate following me because of the smell, so I am always last, although its not bad enough for it to be noticeable in the cab. When at elevation, it is especially bad, which is explainable due to lack of air and no computer to adjust fuel accordingly. I have an AFR gauge, at elevation it shows about 25 parts richer then at sea level at idle.
It makes me feel better that others are experiencing similar symptoms, like someone else has stated, these are old diesels with non of the foo foo things on it to reduce emissions, but i am more then happy to stinky along getting my 22mpg.
AussieHJCruza
Supporting Vendor
- Joined
- Jul 8, 2013
- Threads
- 64
- Messages
- 2,992
- Location
- New South Wales, Australia
- Website
- www.completecruisers.com.au
The mechanical 1HD engines do seem to be characteristically smoky, especially the trademark idle smoke. Mine was pretty clean when it was warm with a tricked up pump and rebuilt injectors, timing at 1.3mm lift and ACSD deleted but certainly in the cold it was definitely smoky at idle. An IDI diesel seems to burn a lot cleaner than a DI in the Pre-commonrail era. IMHO, why the coasters of the era generally had a 1HZ rather than a 1HD - passengers would quite likely find start-up and idle smoke objectionable. The same sort of thing seems evident with lighter duty vehicles.
As for the smell, I like it! Nothing like the smell of a cold diesel in the morning.
As for the smell, I like it! Nothing like the smell of a cold diesel in the morning.
Last edited:
asutherland
VA7 HDT
True, but nearly every 1HD-T I've seen this side of the big puddle has been idle smoking way more than it should. It CAN be made to smoke less.
Here is a recent video (this week) of mine idling in -2C, completely cold, after running about 5 mins. On initial startup in colder temps it hazes a bit (but not enough to smoke out my neighbours anymore). After driving for 30 seconds it's gone, completely.
A longer video, here. This was taken a few weeks back in the same kind of ambient temps. Truck was started, idled for 3 mins, then driven half a block.
Here is a video of my 1HD-T not long after I imported it, years ago. This is in +10C temps with the engine not even cold. The difference is amazing.
Smokey 1HD-T
I find that in REALLY cold weather (ie. -20C to -35C) while warming up, the smoke of a properly running pump creates more "condensation" type smoke like a typical newer gas car, than that annoying typical 1HD-T idle smoke.
Things that I've changed that affected the amount of idle smoke,
- Injection nozzles checked and rebuilt by a reputable shop.
- Injection pump completely rebuild, again by a reputable shop that knows these pumps. Shout-out to the guru @yotahed
- FUEL SOURCE. This made a large difference. Here in central BC, I found that Petro-Canada diesel burnt the cleanest, at least in my 1HD-T. A large, noticeable difference from Chevron, Husky, or any of the other large fuel stations.
- A properly tuned main fuel screw and PROPERLY TUNED BOOST COMPENSATOR. No crappy "modified power rod".
- I replaced my glow plugs as well and modified my timer circuit. Not sure if that helped so much as the other items above, but it definitely didn't hurt the cold starts.
asutherland
VA7 HDT
Someone wanted a video of a completely cold start without any pre-video driving or idling. I just took this one now. Ambient temp is -1C.
You can see the slight white haze, but really hardly anything. And then after 30 seconds of driving it's gone completely.
You can see the slight white haze, but really hardly anything. And then after 30 seconds of driving it's gone completely.
Mine is about the same in those conditions, just about 140K kms with original injectors and pump...but -1C isn't cold. It was -28C here this morning before factoring in the windchill, that's cold!
Truck looks great by the way!
asutherland
VA7 HDT
Thanks dude! Yeah I know, -1 is balmy even for kamloops this time of year. A couple years ago you should have seen the s*** show of trying to start my truck (pre inj work) in -36 at Loon lake. Wow...
This is how she was before being dropped off at the mechanic. Been chasing the smoke monster for a couple years now in a vacuum of IRL diesel knowledge, so happy to hand if off for a bit. Again this is after new injectors, a rebuilt IP, and new turbo. Does slobber a fair amount of oil out of the breather, in to a mann-hummel catch can.
mudgudgeon
Resident galah
This is how mine was.
Mine loved cold temps, sub 10c it ran great, made more power and sounded crisp.
Well got the cruiser back. Around 400 psi on all but #3 at 370. I don't think there is any point to continue wringing my hands over smoke until I do a refresh or rebuild. Runs fine for now so I will enjoy it another summer and develop a plan and budget.
Ghostrider I
I wear many "heads" as I have many vehicles.
What kind of exhaust are you running?
asutherland
VA7 HDT
Whatever came with the hdj81 when I imported it. I think it's just under 3 inches, and definitely stainless. There's no exhaust or resonators but it's not loud at all. I've had to replace the last foot or two a few times due to wheeling though.
My truck is running a rebuilt 1HDT, updated to 92+ style pistons. Pump and injectors have been modified by Jon @ Okanagan Diesel to match.
Turbo is Grunter Extreme @ 20Psi.
I’m running into an issue where I have the main fuel screw turned all the way up - any more and it will rev up on its own. The idle screw is all the way down with almost zero engagement.
Low end response is good, lots of black smoke if you floor it below 1800rpm w/ torque converter locked up.
It feels like it doesn’t enough fuel up top. If I reduce the fuel screw at all, there is an obvious dead spot at 2000rpm when it hits 20Psi and doesn’t have any guts. Can’t turn it up any more because of aforementioned runaway idle.
Off-boost screw on top of compensator is backed off all the way. Star wheel is set up so that aneroid pin begins at the base of ramp under no boost, and ends at top of ramp at full boost.
Any tips? Would love to reduce fuelling under no boost, and ramp up max boost fuel.
Turbo is Grunter Extreme @ 20Psi.
I’m running into an issue where I have the main fuel screw turned all the way up - any more and it will rev up on its own. The idle screw is all the way down with almost zero engagement.
Low end response is good, lots of black smoke if you floor it below 1800rpm w/ torque converter locked up.
It feels like it doesn’t enough fuel up top. If I reduce the fuel screw at all, there is an obvious dead spot at 2000rpm when it hits 20Psi and doesn’t have any guts. Can’t turn it up any more because of aforementioned runaway idle.
Off-boost screw on top of compensator is backed off all the way. Star wheel is set up so that aneroid pin begins at the base of ramp under no boost, and ends at top of ramp at full boost.
Any tips? Would love to reduce fuelling under no boost, and ramp up max boost fuel.
Set the fuel screw back to where the shop set it and grind a deeper ramp onto the compensator pin. Or have a new pin with a deeper ramp machined . If you can't get enough on boost hi tom fueling then add it with the fuel screw .
Tapage
Club 4X4 Panamá
Sometimes there is just not enough fuel reaching your pump .. well that was my case ..
Does anybody know what kind of power stock 1HD-T injectors are good for?
Any higher flow "bolt on" nozzles available, or anything?
Any higher flow "bolt on" nozzles available, or anything?
Posting a Denso VE pump repair manual, found this guy while scouring the net for manuals. Hopefully it helps someone here!
