Wastegate disconnected, fuel cut

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what i find is interesting is all the claims of head popping off when i have never even met anyone that has had this happen on a Toyota diesel. we are not talking Chevy sh*t here, take a gasser Chevy and blower it then i can see it happening...
a 2LTE with a dinky little turbo? i will pay good money to see this happen...
 
expat said:
Keep in mind with a diesel that there is no stochiametric (sic?) ratio like a gasser, therefore no "extra" air relative to the fuel. Well, I guess it is "extra", but that's where you are getting your power!
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I've got to disagree on that. there is always the possibility for extra air in a diesel. Most diesels don't have a don't require a throttle. At idle the amount of air is huge compared to fuel, the mix is far from stochiometric. The sound of combustion so characteristic has a lot to do with that fact. Lots of air equals extra lean mixture equals extra fast and quick combustion, hence the characteristic 'diesel' sound.

expat said:
My concern wouldn't be with overpressuring your head, but for overspeeding the turbine. They might be lightweight and small, but the centripital force is awesome on these units. Any cracking in the fins might cause it to destroy itself.
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You surely mean centrifugal. The centripetal force is the resistance to centrifugal force. But I agree that the centripetal force must be awesome to resist the centifugal force so as to prevent the fins from flying apart.

expat said:
Not to mention that the oil wedge it rides on is only good for a certain max rpm.
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I think you are mistaken. Higher speeds actually pulls oil better and moves the oil wedge away from the vertical. But your assertion raises a valid question, about oil mollecule stability from shear. I would think that synthetic oil mollecules would be nore shear resistant than non synthetic, but I may be mistaken. That being said, I doubt that speed will have a real negative effect on the bearings. There are bearings out there which run at much higher revolutions.
 
okay, from the horses mouth:
when you run a turbo past the designed paramaters (mapped turbo) then there is more heat generated since you are trying to shove more air into a restricted opening. this is actually a good thing since diesels require more air to help burn the fuel at higher BTUs.
ANY turbo can loose fins due to age, hence rebuild shops.
the reason the small turbo stops creating boost at around 14 lbs is because of the pressure of the exhaust opens the spring loaded internal waste gate (kind of a preventive feature should the manual waste gate get stuck.
the film of oil is the same at any rpm since the oil pressure is the contributing factor not the spinning of the bushings. at an average of 80 psi into such a small area the flow is more than adaquate but this is in relation to the type of oil used.
the information is, once the oil film has been overcome the damage is done in a milasecond.

of course the tiem that you are at maximum boost is related to your right foot but usually is is for very brief periods since it only comes on when at full power, climbing a hill or passing etc.
at normal highway driving you are running about 6 lbs of boost.

cheers
 
crushers said:
of course the tiem that you are at maximum boost is related to your right foot but usually is is for very brief periods since it only comes on when at full power, climbing a hill or passing etc.
at normal highway driving you are running about 6 lbs of boost.

cheers
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Ok .. continue learning.

Let me underestand some statements.

1. There is no posible over spin in turbo .. it's a relative concept ?

2. In 2L-T ( or TE ) engines are not really worried handling 14 PSI of boost ( as max boost with factory turbo ) coz the head and head bolts/ gasket can handle fine this pressure . ?

3. I thought in a IDI and non factory turbo the ecuation is totaly diferent coz it have more compresion range and less resistance head/bolts/gasket ( at this point talking about my 2H engine )

4. Talking about boost resistance in Toy engines .. it's really huge diference between rings, pistons ( ya sure DI vs IDI ) head, gasket, bolts etc ?

5. Wayne .. did you run intercooler for 14 PSI . ? or you thought it's wasted time and money ( turbo lag ) for 14 PSI or less and are only and advantage over 14 PSI . ?
 
Tapage said:
3. I thought in a IDI and non factory turbo the ecuation is totaly diferent coz it have more compresion range and less resistance head/bolts/gasket ( at this point talking about my 2H engine )
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Now I remember! That's where I think I got the info about breaking head bolts...

Great questions, Tapage, hope Wayne has got some more words of wisdom to grace us with :)

As far as head bolts are concerned, I was certain that Toyota had come out with stronger head bolts at some point. I wonder if stronger bolts are available for situations like those. For example, are the bolts for the latest 1HD-TE different than those of the early 1HD-T (with lower power output)?

Remember, folks, Rudolph Diesel himself blew his first engine ;)
 
Ok .. continue learning.

Let me underestand some statements.

1. There is no posible over spin in turbo .. it's a relative concept ?

---if it has an internal waste gate then you "shouldn't" be able to over boost with a factory Toyota diesel turbo.

2. In 2L-T ( or TE ) engines are not really worried handling 14 PSI of boost ( as max boost with factory turbo ) coz the head and head bolts/ gasket can handle fine this pressure . ?

---yep.

3. I thought in a IDI and non factory turbo the ecuation is totaly diferent coz it have more compresion range and less resistance head/bolts/gasket ( at this point talking about my 2H engine )

---i was running 14 PSI on the old mapped 1HZ with lots of fuel and no problems. mind you that was a mapped turbo for that application.

4. Talking about boost resistance in Toy engines .. it's really huge diference between rings, pistons ( ya sure DI vs IDI ) head, gasket, bolts etc ?

---don't know never checked the piston thickness of each

5. Wayne .. did you run intercooler for 14 PSI . ? or you thought it's wasted time and money ( turbo lag ) for 14 PSI or less and are only and advantage over 14 PSI . ?

---nope. i have one here that i can use but have no inclination to install...
 
83bj60 said:
Now I remember! That's where I think I got the info about breaking head bolts...

Great questions, Tapage, hope Wayne has got some more words of wisdom to grace us with :)

As far as head bolts are concerned, I was certain that Toyota had come out with stronger head bolts at some point. I wonder if stronger bolts are available for situations like those. For example, are the bolts for the latest 1HD-TE different than those of the early 1HD-T (with lower power output)?

Remember, folks, Rudolph Diesel himself blew his first engine ;)
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are you sure you are not confusing the head bolts on a diesel with the head bolts on a gasser?

BTW, (seriously off topic) are you in a position to translate some stuff for me? please email me direct at:
wayne@crushersrule.com
 
crushers said:
i was running 14 PSI on the old mapped 1HZ with lots of fuel and no problems. mind you that was a mapped turbo for that application.
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What is a mapped turbo? Do you mean map gas injection (Just guessing!)? Since the 1HZ is almost identical to the 1HD, shouldn't that apply to the 1HD-T as well? In other words, can the turbo on the 1HD-T be safely modded that way with no risk to the head/gasket?

Things to ponder for after the thaw ;)...
 
83bj60 said:
What is a mapped turbo? Do you mean map gas injection (Just guessing!)? Since the 1HZ is almost identical to the 1HD, shouldn't that apply to the 1HD-T as well? In other words, can the turbo on the 1HD-T be safely modded that way with no risk to the head/gasket?

Things to ponder for after the thaw ;)...
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mapped is aterm used by turbo shops to specify which AR they use for a particular application...
ie, i like higher rpm than most so the turbo i use is mapped for that application...
yes, the HDT will handle the 14 psi nicely...make sur eyou have a boost gauge installed
 
My conclusion is ..

2L-T engines go full boost ! :bounce:

Non Factory Toy engines rocks ! hahahaahha

You don't like Intercoolers !
 
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