Max boost on 1hd-ft (1 Viewer)
- Thread starter adrian00
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I know that anything over about 1000psi can be pretty dangerous in the event of containment failure. But even a large volume of air at just 4PSI can kill you under the right circumstances (like trying to seat the bead on a tractor tire and the tire blows out), but those circumstances are unlikely in a turbo system. I would say that as long as the hood is down and you're behind the firewall, if there was a catastophic failure of the intake manifold, it's unlikely that any of the shrapnel could penetrate the sheet metal and harm your or family in the vehicle. If you were really concerned, you could probably wrap your intake in some sort of balistic blanket like racers do for their clutch plates. Then you can safely run somewhere into the low thousands of psi. Probably no more than about 3,500psi though.
While the boost would be safe, the power you could make with 3,500lbs of boost would be 'killer'. Some of the drag trucks are making 1100hp and 2,500 ft-lbs with just 50psi. The most I've ever heard of is about 160 psi boost in a detroit diesel drag truck. I doubt you can make anything even close to that much boost, so I would say your safety is unaffected by even the most boost you can practically feed into a 1HD-FT.
Peter Straub
While the boost would be safe, the power you could make with 3,500lbs of boost would be 'killer'. Some of the drag trucks are making 1100hp and 2,500 ft-lbs with just 50psi. The most I've ever heard of is about 160 psi boost in a detroit diesel drag truck. I doubt you can make anything even close to that much boost, so I would say your safety is unaffected by even the most boost you can practically feed into a 1HD-FT.
Peter Straub
If the engine is mechanically sound the limiting factor will be exhaust temperature.Too much boost and something will probably seize or melt long before anything broke mechanically.Many engines with big boost/power run water injection systems.If you want to experiment fit a pyro gauge.
Towpack said:
What would be the max temp to run before the turbo??
Behemoth60 said:
Umm... what?
IMHO it is unlikely that you will blow up your intake. If too much boost, probably just blow off an intercooler piping flex boot or a gasket. Personally I would limit boost to around 20 PSI, but I would increase it incrementally. I believe you would be absolutely safe at 15 PSI. Excessive pressure will probably lead to some unreliability. I think Crushers was running about 14-15 PSI in his turbo'd 75 with a 1HZ. And he had propane to boot.
Remember that its not just boost that gets you power, but fuel also. The higher boost just gets more air in to burn the extra fuel. Get a pyro. 1100 - 1250 PSI max. Have fun.
-kevin
crushers
post ho
yep 15 lbs max with PI and didn't have a concern either with the engine of the EGTs and that bugger is way overfueled...
too much boost and the heat from compression kills the advantage of the boosting due to expansion of gasses...
or so i have been informed...
too much boost and the heat from compression kills the advantage of the boosting due to expansion of gasses...
or so i have been informed...
Tapage
Club 4X4 Panamá
Technikev said:
1100 - 1250 ºF I mean ..
Geez, nice catch. A bit of a brain fart with all this talk of PSI and exhaust temps. 
Yeah, max EGT is 1100-1200 DEGREES. LOL
-Kevin
Yeah, max EGT is 1100-1200 DEGREES. LOL
-Kevin
W T F !
Behemoth60 said:
adrian00 said:
Have you ever had the head off a 1HD-FT? The valves are very close together. There is almost no metal between them. Running higher bosts can lead to head cracks on these engines. Want to see some photos of what they look like? It costs a lot to buy a new head.
adrian00 said:
I am running a max of 14lbs of boost on my HJD80L with 1HD-FT I have an aftermarket intercooler. recently I turned up my fuel because I was rarely hitting 800F on my egt's now that fuel it turned up (huge difference in power) I am around 800f on flat road under load and on hills with trailer in tow (6000lbs towing) maybe I hit between 1000 - 1100F at the most. Truck is dialed in works great
Cheers,
Michael
Technikev said:
Adrian00 was asking how much boost is safe. 20psi is a no-brainer. A leaf blower can make 20psi. There's nothing dangerous about that.
The discussion about how much boost you *should* run for engine longevity, power, etc. has been discussed to death, but how much boost could *cause* your death or other bodily harm is an interesting new topic that adrian00 has tabled in his inquiry about safety.
I'm not sure why you guys are yammering on about 15-20 lbs of boost and won't contribute an on-topic post to this guys query.
Peter Straub
Behemoth60 said:
Your right Peter, I was just Yammering on what I run on mine, I did not even think of running up until a blow a perfectly good 1HD-FT what was I thinking
For what its worth Adrian00, I think you should run it as high as it will go until you blow it into pieces and then let us know so I don't run it that high, mybe a long term report so if goes in a month we can still get the data Michael
crushers
post ho
max SAFE boost was his question...
for Peter, who rebuilds his engines every time he changes his oil, max boost is what ever the turbo will produce.
for the rest of us max is about 15psi...
cheers
for Peter, who rebuilds his engines every time he changes his oil, max boost is what ever the turbo will produce.
for the rest of us max is about 15psi...
cheers
crushers said:
Great point, Wayne. It seems we all mis-interpreted Adreian00's question. Clearly, he's a jewel thief and using his engine to compress the air inside a safe to crack it open. In that case, maximum safe boost would be dictated by the thickness of the walls of the safe, the grade and treatment of the steel, the mechanics of the construction, the seals used to contain the air inside, etc. A much more interesting question when you think of it that way.
Peter Straub
crushers
post ho
this is true, max safe pressure for a steel object is much higher than say an air line to your skin...
and here I thought we were talking about diesel engines to power your auto down the road
you Guys are always carrying on about how much boost is safe and what air pressure can do but which one of you has ever popped your cylinder head and could contribute it to overboosting. I don't think there's one!! It sounds like alot of urban folklore I knew a guy who knew a guy who... I would for once like to here a testamonial of someone with a blown 3B that could contribute it to giving it too much fresh air and not overfueling or overrevving.
crushers
post ho
feel free to acomplish your own task and let us all know the results of your test...
blownbj said:
Finally, someone else out there is starting to see things my way. Indeed, I've said it before, I don't think the max safe boost for a 3B/13B-T has been established yet. When a repeatable failure happens to a decent sampling of engines which were using a set amount of boost, we can start to draw some conlcusions. But no one, EVER, that I know of, has wrecked ANY part of their Toyota engine due to boost alone.
Everyone, please go turn up your boost TODAY! We need to start collecting some data.
Peter Straub
