max boost on a 1HD

[petefj40]

What is the most psi one would put through a stock 80 1HD turbo diesel? I gather the stock psi is around 12psi.
Currently I get up to 20psi on mine. But I'm happy to turn it back for longer life.

[callum007]

I'd be happy at that Pete. I ran 17psi on my 13bt with no issues. I dont think you should try for too much more just yet..

[red-devil]

pete is that 20 peak spike or constant purssure

[petefj40]

I'd be happy at that Pete. I ran 17psi on my 13bt with no issues. I dont think you should try for too much more just yet..

Cheers.

[petefj40]

pete is that 20 peak spike or constant purssure

With my foot flat it stays there @ 20psi.

[petefj40]

The fuel side of it is still stock. With the help from a diesel mechanic, the way the boost controller was plumbed in was wrong. So that's been changed. Got rid of the old controller too. Seems to work really well now.
But since replacing the turbo housing and exhaust manifold (both cracked) I don't want them to fail again.

[strx7]

unless your pump has some serious mods done to it, or you are injected water & meths as extra fuel, you are probably wasting air by running that much boost, if you knocked it back to 13 or 14psi you would be making the same power. 10psi is standard. I dyno'd mine at 10psi, then again at 13.5psi, not a single extra hp was made as there was no more deisel going in to make more power with. if your truck doesn't have an intercooler 20psi continual use is asking for issues.

[petefj40]

unless your pump has some serious mods done to it, or you are injected water & meths as extra fuel, you are probably wasting air by running that much boost, if you knocked it back to 13 or 14psi you would be making the same power. 10psi is standard. I dyno'd mine at 10psi, then again at 13.5psi, not a single extra hp was made as there was no more deisel going in to make more power with. if your truck doesn't have an intercooler 20psi continual use is asking for issues.

This is what I wanted to hear.
Cheers.

[BlakeJ]

Tu's runs his at 15psi max, and thats with a pretty aggressive tune and no intercooler

[wax]

Pump it in, if you put in more air than fuel its only going to lower the egt,s

[tweake]

if your truck doesn't have an intercooler 20psi continual use is asking for issues.

thats about right.
high boost can be good (ie lowers egt's) but only up to a point.
at 20 psi your probably well past good efficiency and it simply increases inlet temps without actually pushing any more air in, at the expense of very high exhaust back pressure.
high inlet temps and lots of end gas due to large back pressure can create very high temp flame fronts which can simply burn a hole through the pistons. that can happen even with safe egt's.

drop the boost down till your still within safe egt range. intercooling will help more than increasing boost.

[petefj40]

Cheers.
I've taken it right back to 12psi. First thing i noticed was a higher EGT. Just by holding the foot flat in third driving on the flat, the EGT got up to 610 celsius.

[tweake]

egr sensor pre turbo or after?

[petefj40]

egr sensor pre turbo or after?

Pre

[callum007]

I'd be happy at that Pete. I ran 17psi on my 13bt with no issues. I dont think you should try for too much more just yet..

Sorry Pete, I actually thought you had already intercooled it.. Sounds like you have done your research now. But i still think you can find a little more life in it at slightly higher boost..

[petefj40]

I'd be happy at that Pete. I ran 17psi on my 13bt with no issues. I dont think you should try for too much more just yet..

Sorry Pete, I actually thought you had already intercooled it.. Sounds like you have done your research now. But i still think you can find a little more life in it at slightly higher boost..

I'm going to follow 2's lead and go no higher than 15psi. But he's always wrecking stuff. But through breaking lots of stuff I'm hoping he's learning so I can learn off him.
But after replacing the bits on my truck I want to keep it reliable. I guess keeping it stock would do that and forget the extra boost and more fuel. An intercool kit might help things when I'm cruising at 100k. But if I'm going 30k up a hill I don't think it'll help much unless I throw an electric fan in front of it.

[tweake]

egr sensor pre turbo or after?

Pre

no problem then its running fairly cool. tho need to do a full load run up a hill and see what it gets to.

[petefj40]

egr sensor pre turbo or after?

Pre

no problem then its running fairly cool. tho need to do a full load run up a hill and see what it gets to.

It's a learning curve for me. So any feedback is great.
Thanks.
Pete.

[wax]

Cheers.
I've taken it right back to 12psi. First thing i noticed was a higher EGT. Just by holding the foot flat in third driving on the flat, the EGT got up to 610 celsius.

Yeah Of course if you drop airflow it will run hotter. Turn the boost right up and watch the egt go down

[petefj40]

Cheers.
I've taken it right back to 12psi. First thing i noticed was a higher EGT. Just by holding the foot flat in third driving on the flat, the EGT got up to 610 celsius.

Yeah Of course if you drop airflow it will run hotter. Turn the boost right up and watch the egt go down

I'm learning.

[Lynx]

Yeah Of course if you drop airflow it will run hotter. Turn the boost right up and watch the egt go down

That only works to a certain extent, i personally wouldnt recommend it.

Cheers Daniel

[wax]

Im up to 25 psi on my td27 its working well. Not a toyota I know but still a turbo diesel. Going up over 12 psi is not going to hurt it though

[strx7]

the compressors on these turbos, both 1HDT and TD27 are MILES outside their efficency range at 20+psi, all you are doing is heating the air up for no actual CFM gain.
CFM and Fuel make power, not PSI....., all it makes is PRESSURE.

[crazyclark31]

yep^^^^.
Esp the ct26 that the toyotas use. the are at their absolute max at 18psi(unmodded) even with intercooler the air temps post compressor would be massive. If you wanna get a good performance boost the fit a tdo5. even at the same boost you are currently using their would be big gains.
Best bet is fit a massive frount mount and up the boost to around 15psi.

[wax]

the compressors on these turbos, both 1HDT and TD27 are MILES outside their efficency range at 20+psi, all you are doing is heating the air up for no actual CFM gain.
CFM and Fuel make power, not PSI....., all it makes is PRESSURE.

Good point and very true. I'm not running a std turbo.
But what your saying is something that is very important. I wasn't really factoring in the turbo when I was saying turn up the boost

[mazdamike]

I'd be happy at that Pete. I ran 17psi on my 13bt with no issues. I dont think you should try for too much more just yet..

Sorry Pete, I actually thought you had already intercooled it.. Sounds like you have done your research now. But i still think you can find a little more life in it at slightly higher boost..

I'm going to follow 2's lead and go no higher than 15psi. But he's always wrecking stuff. But through breaking lots of stuff I'm hoping he's learning so I can learn off him.

if u were going to follow 2s lead u should have never bought it lol
sorry pete had to be said