1HZ Turbo thread

[crushers]

Getting abusive already? Sounds like you're losing an argument.

Quite simple. Because when you drop below cruising rpm (like on a hill) you want full torque available. That needs full boost.
It's necessary offroad as well as having a positive effect on fuel economy.



So toyota continues to get it wrong with all their diesels then huh? All the ones I've driven get full boost before 2000rpm.


The answer to that question is quite clear on this subject.

your "theory" needs some more research since you are wrong. when you are climbing a hill you drop a gear and the rpm goes up creating more torque and more boost... if you are already producing full boost at 2000 rpm WHY would there be any more boost available below the cruising rpm? buddy, back to the drawing with load board for you.

oh God of turbos, rpm does not relate to boost, load relates to boost. try it out someday AWAY from your desk.

i have yet to see a stock toyota produce full boost at 2000 rpm unless it is under load. your statement is missing this important fact.

under load you can be creating 14 lbs of boost at 1500 rpm and with no load (ie cruising down the highway) 6 lbs of boost at 3500 rpm... you NEED load to create boost.

i agree, the answer is very clear on this subject. you are shoot BS again.

 

[tmarx]

This is getting interesting but also somewhat confusing. On my 105 1hz I have the Mitsu TD04 turbo and aqua cooler with snorkel and 2.5"exh but I have no idea what the A/R is for this turbo?

Max boost is 10.1 and cruising at 120km/h on the flats the boost is 8.6 with Egts at 680. Is my turbo too small ?

 

[Dougal]

your "theory" needs some more research since you are wrong. when you are climbing a hill you drop a gear and the rpm goes up creating more torque and more boost... if you are already producing full boost at 2000 rpm WHY would there be any more boost available below the cruising rpm? buddy, back to the drawing with load board for you.

Just because an engine and turbo combination is capable of producing full boost before 2000rpm does not mean it always produces full boost above 2000rpm.
I suspect you know this already, but arguing against that makes it seem you do not.

oh God of turbos, rpm does not relate to boost, load relates to boost. try it out someday AWAY from your desk.

Boost is related to both engine load and rpm. If the rpm is too low the turbo can't deliver the boost, if the rpm is too high (i.e. your turbo is too small) then the turbo can't deliver boost at the required flowrate.

i have yet to see a stock toyota produce full boost at 2000 rpm unless it is under load. your statement is missing this important fact.

You are kidding right? Every toyota diesel I have driven gets full boost before 2000rpm under load.
1HD-FTE's
1KZ's (many in different trucks)
Toyoace vans
1KD's
etc

 

[Dougal]

This is getting interesting but also somewhat confusing. On my 105 1hz I have the Mitsu TD04 turbo and aqua cooler with snorkel and 2.5"exh but I have no idea what the A/R is for this turbo?

Max boost is 10.1 and cruising at 120km/h on the flats the boost is 8.6 with Egts at 680. Is my turbo too small ?

There is a wide range of turbos which can be fitted to any particular engine, the application depends a lot on which is suitable.

A turbo that is on the small side will boost sooner but will produce less top end power as the smaller turbos create more exhuast backpressure at higher revs.
A turbo on the large side will boost later, producing more top end power at the expense of low end boost and torque.

At the extreme ends of the spectrum, a turbo that is very small can overspeed and destroy itself. A turbo that is far too big will not be able to produce the required boost, that's the problem Louis is currently having.

Your turbo sounds about right for size, but it depends what you need for your purposes.

 

[tmarx]

Thanx for the feedback .

 

[lshobie]

Ok, Wayne, you were right about the fuel adjustment screw There was a solid cap fixed over top of it - I had to destroy it to get it off - was fastened in a way so that it was never to be adjusted by the looks of it. Good thing too as the screw was nice and shiny and easy to adjust as opposed to the rest of the mine truck engine and pump.

So, I cranked the fuel up one full turn and took it for a drive - LOL, wow - it hauls ass!! I got it to 8 pounds on a hill and it started to dump - then I ran out of hill - the EGT's also climbed very quickly to 1200 - so I have turned the adjustment screw back half a turn - will try it again in a while.

So, 8 pounds is no problem now, starts making boost at about 1600 if I remember correctly, full boost is not long after if it requires it. Will try to lower the egt's with fuel setting. I have also installed a turbo smart dial for later on when I add the intercooler (maybe next week??)

So far so good - turbo works great! Big turbo - seems to work fine!

Will dyno it on monday before I install the intercooler.

 

[Tapage]

So far so good - turbo works great! Big turbo - seems to work fine!

Will dyno it on monday before I install the intercooler.

Damn ! jelaous .. but great news know the huge turbo function ..

And at the guys fight .. my 1HD-T it's full bust @2000 rpm .. 10 PSI ..

My 2H I set to 10 psi@2000 rpm .. ( under load sure ) and 14 PSI@2800 rpm .!

I'm able to drive she ( Tencha ) at 2000 rpm with 2-3 PSI of boost .. and sure if I push the pedal to metal after 10 segs I will be at 10 PSI ( flat surface . and optimal conditions )

 

[lshobie]

This was an experiment of sorts, I imagine that if a competition guys really wanted to tweak his truck he could use this big turbo - intercooler, boost compensator or whatever - and really crank it up.

I can pretty much floor it at anything over 1800 rpm on flat surface and it keeps accelerating past 2800 rpm quite strong - no idea how fast I'm going though as my speedo is broken Thats ok - not into this for a fast truck - just want to see how it works on the big hills in quebec.


Dyno results coming!

 

[lshobie]

Ok, been doing some tweeking. Initial tests were donw with a short piece of exhaust on the truck, I didnt hook it up to the old system until I figured out if I had to take the turbo off. I also noticed that the boost was spiking - hitting 8 pounds then droping to 5 quickly.

So, I reconnected the muffler and installed the turbosmart wastegate controller. This fricking truck hauls now, 8 pounds constant if I want it, had it to 12 for a short burst when playing with the turbosmart - reset it to 8lbs and won't up the boost until the intercooler is installed.

The engine is quieter - no more fuel knock, exhaust is more quiet, the turbo whine is nice and deep, not like a little CT26. I do have some black smoke when I punch it. EGTs can get to 1200 if I force it. The spiking has stopped now that the complete exhaust system is installed.

I have noticeable boost at 16-1700 rpm and it carries through past 2800 rpm, haven't had it going much faster yet as I had to work tonight. It'll hit 8 pounds right away if it is under load.

I am liking this more every minute.

 

[Deny]

This thread is useless without pics!

 

[Moe R]

2X It's like a train wreck, u keep looking but it's not all that.

 

[crushers]

buddy, with the right setup it will pull strong to 4500 rpm...you are not even letting the old girl stretch her legs... i usually shift at 3500...
play with it, let her run... 14 lbs with max of 1400 F (if you will ever see that temp in normal driving) and what is the old saying?
"get in, shut up and hold on!!"

once the intercooler is installed then add a tweak of propane... a whole new dimension!!

 

[lshobie]

3500! lol, wel I'll try that tomorrow.

I'll upload pics tomorrow too.

 

[tmarx]

buddy, with the right setup it will pull strong to 4500 rpm...you are not even letting the old girl stretch her legs... i usually shift at 3500...
!

I have to agree, mine hits 4500 easily.We recently had a dyno day and it was nice to give the Efi petrolheads a bit of a run for their money as far as Torque goes

 

[lshobie]

How can Carstens 80 series with 1HDT only put out 105HP at the wheels? Seems kind of low.

 

[tmarx]

Louis, that chart was drafted by a petrolhead. It should have said 1HZ in respect of both...

 

[lshobie]

Oh the poor child eh - gassers don't know what they are missing

 

[crushers]

louis, i have run gassers and diesels for nearly 30 years... the only downfall of a gasser is the fuel milage. a well tuned stock toyota 6 gasser can lug the same as a diesel, rev faster than a diesel, same torque as a diesel. both have roughly the same top rpm limit.

we love our diesels but don't kid yourself, a gasser in the right hands will kick a diesels ass (that being said a diesel in the right hands will kick as well)

 

[lshobie]

Hi Wayne, no doubt about it, I know gassers are very powerful, and generally are powerful and torqy right from the start - whereas we usually have to crank up our diesels to make them perform better. I just like diesels better - mostly because of the low maintenance benefits.

 

[crushers]

i like them cause they are cool...