larger turbine on my turbo

[rideglobally]

i am gonna get the turbo on my 12ht rebuild; my question is what is the largest turbine i can put on my turbo with out compromising too much on reliability.

also can you tell me how much of an increase on the engine performance i should expect from that turbine.

i am also gonna be installing an intercooler when the newly rebuild turbo is installed.

picture of my turbo below

thanks

 

[blis]

youre power increase with plain turbo swap equals zero, but if you were to raise boost and increase fuel were talking anywhere from +5hp to +50hp

 

[Chang-kuao-lo]

Wastegate control...

 

[Tapage]

I believe in turbo swap .. if you want more from your engine .. GT2860R ..

if not .. the CT26 it's a great turbo .. with a boost controller and intercooler you can make the diference ..

 

[Chang-kuao-lo]

The CT20 I have will push 18psi with the wastegate disabled.

 

[Dougal]

A bigger turbine will simply swap low end torque for high end power. Not IMO what you want from a diesel.

What boost level are you currently running?

 

[rideglobally]

my turbo is current shim to 10 psi. can you pls explain what "swap low end torgue to high end power". how will that effect my driving on the freeway at 70 MPH or driving on bumpy roads at 30 MPH for extended period of time or high altitude driving?..... thanks

A bigger turbine will simply swap low end torque for high end power. Not IMO what you want from a diesel.

What boost level are you currently running?

 

[Dougal]

my turbo is current shim to 10 psi. can you pls explain what "swap low end torgue to high end power". how will that effect my driving on the freeway at 70 MPH or driving on bumpy roads at 30 MPH for extended period of time or high altitude driving?..... thanks

It will shift your boost curve up the rev range. You will lose some low rpm boost but the turbo will work a little better at high rpm.
This won't make much difference at 70mph in top gear, but if you change down for passing it will give you a little more power.
At lower rpm the engine will have less torque due to less boost. It will make driving at altitude worse as the thinner air makes the turbo require more rpm to work the same.

 

[rideglobally]

what do you think is my best option to increase power without sacrificing too much on reliability?

It will shift your boost curve up the rev range. You will lose some low rpm boost but the turbo will work a little better at high rpm.
This won't make much difference at 70mph in top gear, but if you change down for passing it will give you a little more power.
At lower rpm the engine will have less torque due to less boost. It will make driving at altitude worse as the thinner air makes the turbo require more rpm to work the same.

 

[Dougal]

what do you think is my best option to increase power without sacrificing too much on reliability?

Anything you do to increase power will reduce engine life. It's all a tradeoff.
For me I'd fit a garrett turbo and up the boost. But I probably have a different set of requirements than you do.
Gbentnik had some excellent results, did you read his thread?

 

[rideglobally]

yes, i did but way over the top to what i am trying to do, if increasing power is too much of a compromise on reliability, i might just stick with the 12ht turbo without modification.

Gbentnik had some excellent results, did you read his thread?

 

[Dougal]

yes, i did but way over the top to what i am trying to do, if increasing power is too much of a compromise on reliability, i might just stick with the 12ht turbo without modification.

Did you see the part where he upped the boost and fuel on a rebuilt 12HT. Delivered 0-100 times around 15 seconds.

How tired is your engine?

 

[daboheme]

I'm about to fit an intercooler and up boost to 0.7-0.8 bar.

 

[rideglobally]

i did not read that, send me the link if you can.
my engine has 400. KM

thanks

Did you see the part where he upped the boost and fuel on a rebuilt 12HT. Delivered 0-100 times around 15 seconds.

How tired is your engine?

 

[Tapage]

i did not read that, send me the link if you can.
my engine has 400. KM

thanks

IMOP

rebuild your engine .. run a proper bigger intercooler and up the boost to 1 bar , then proper adjust the fuel.

 

[Dougal]

i did not read that, send me the link if you can.
my engine has 400. KM

thanks

Here's the power and weight he quoted.
https://forum.ih8mud.com/diesel-tec...9-12h-t-performance-build-10.html#post4700631

Just extra fuel and boost, post #193 on here:
https://forum.ih8mud.com/diesel-tech-24-volts-systems/269939-12h-t-performance-build-7.html

Video here:
YouTube - 12HT 1/4 Mile HJ61 18.04 seconds
18 second 1/4 mile, seems to be around 12 seconds to 100km/h.

 

[rideglobally]

thank you all, from what i have come to understand from all your respond is the following:
1. putting a bigger turbine does not make sense

2. what i need to do is to shim the waste gate to maybe 14 to 15 boost. i understand that will be a safe range for a 12ht engine with out compromising reliability too much. also rarely will i ever be at 15 boost, the normal max i would be using would be 10 boost, that is where my turbo in shimmed right now. i will shim it to 14 or 15 boost just in case i need it.

3. increase fuel consumption. actually i am not too sure about this. my question is do i need to do this if i am just shimming the boost to 14 to 15? what would increasing fuel consumption do? how does it effect the boost?

i am i correct to assume that i can do all the above with my current turbo. i am taking it to Turbo Performance tomorrow for an inspection and if it need rebuilding i will do that.

if you think this all make sense let me know, also if you want to add anything else, let me know. again i do not want to compromise too much on reliability, i guess i want the best of both world which i can not have. maybe the next best thing is to have the power that i need in case i need it.

i inspected the rocker arm, lifters and push rods, in fact i took them to Marv today at SOR, because i had to pick up some gaskets. the rocker arm, lifter and push rod are in perfect condition for an engine that has 400. KM . i placed a caliper on the lifters and the outside diameters are 22 mm, the manual says the tolerance is between 22 to 17 mm, push rods are perfectly straight, rocker arm smooth. i have a thread on this forum about that.

thanks you all again, for taking the time. all this have been very helpful and your comments have change the direction on this part of my build.

 

[R2HKS]

You could push 100psi through your engine and not make anymore power without increasing the fuel supply. If the fuel is not there for the increase in air (aka raising boost pressure) then you will not make anymore power by simply raising the boost.

You need to raise the boost in conjuction with the fuel using an EGT gauge to ensure the EGT's don't exceed 1250F. Keep it below that EGT temp and the engine will be happy and quite reliable at your 14-15psi boost. Don't worry about the k's the engine has done. From what you have described its still in good condition.

 

[rideglobally]

more on the turbo

this has been an education for me on Turbo, thanks again. i just dropped off my turbo at Turbo Performance Turbo Performance - For All Your Turbo Related Needs and purchase an isspro pyrometer and a probe with Diesel Manor Diesel Performance at DieselManor, Inc. - Taking the Mystery out of Diesel Performance™ i will be placing the probe before the Turbo on the manifold about 2 inches before the turbo.

i think i will be putting a slightly bigger turbine in there (sorry for my continuing uncertainty on this), when i get the exact turbine i will post it here. according to Turbo Performance my new Turbo will blow about 340 to 360 CFM, at 10 boost because of a bigger turbine. he did confirm the importance of the EGT temperature, he said as long as i don't go beyond 1250F it will be ok. that has to do with the fuel to air mixture. we are also installing an intercooler which is a factor in all of this, in other words all of this need to work together. bottom line is to keep the EGT below 1250F, that is the factor that mostly effect reliability.

hope this all make sense..... thanks

You could push 100psi through your engine and not make anymore power without increasing the fuel supply. If the fuel is not there for the increase in air (aka raising boost pressure) then you will not make anymore power by simply raising the boost.

You need to raise the boost in conjuction with the fuel using an EGT gauge to ensure the EGT's don't exceed 1250F. Keep it below that EGT temp and the engine will be happy and quite reliable at your 14-15psi boost. Don't worry about the k's the engine has done. From what you have described its still in good condition.

 

[Dougal]

this has been an education for me on Turbo, thanks again. i just dropped off my turbo at Turbo Performance Turbo Performance - For All Your Turbo Related Needs and purchase an isspro pyrometer and a probe with Diesel Manor Diesel Performance at DieselManor, Inc. - Taking the Mystery out of Diesel Performance™ i will be placing the probe before the Turbo on the manifold about 2 inches before the turbo.

i think i will be putting a slightly bigger turbine in there (sorry for my continuing uncertainty on this), when i get the exact turbine i will post it here. according to Turbo Performance my new Turbo will blow about 340 to 360 CFM, at 10 boost because of a bigger turbine. he did confirm the importance of the EGT temperature, he said as long as i don't go beyond 1250F it will be ok. that has to do with the fuel to air mixture. we are also installing an intercooler which is a factor in all of this, in other words all of this need to work together. bottom line is to keep the EGT below 1250F, that is the factor that mostly effect reliability.

hope this all make sense..... thanks

Umm.
Increasing the turbine size won't make your compressor do more, it'll actually make it do less.
A bigger turbine housing makes the compressor turn slower which provides less boost when the wastegate is closed and takes more rpm to reach the point where the wastegate opens.
The only point of a bigger turbine is to provide less restriction at higher rpm, this does provide a little more top end power.

At 10psi, I wouldn't bother with an intercooler.