Factory turbo/ats 093 low rpm boost.

[Black dawg]

Been so long since I used one, I dont remember....
At what rpm do yours start showing boost, and how much?

 

[Clb]

It's more load dependant.
With Justins 80/90 probably sub 1000 rpm ( given a load is on it ) with my 1993 with an ats 093

 

[Nero]

Turbo spools under thermal expansion. If you're just cruising at speed you'll see very minimal boost. Unloaded going down the main drag at 45 I typically see 2-4psi. You'll see most boost when accelerating or when loaded. You also want to make your turbo spool linear with your throttle input. If you just mash the go pedal, you'll get very slow spool and lots of smoke. Roll into the throttle. As rpms increase, slowly give it more.

 

[Black dawg]

I guess to clarify, say like 3rd gear from idle speed wot, what does the boost gauge do below 1500 rpm.

 

[Nero]

Almost nothing.

 

[Black dawg]

Almost nothing.

So, when does it start showing boost, and what does the gauge do between 1500 and 2k?
A few reasons for asking, have plans of double od here shortly, and curious if that turbo will get me the boost that I am looking for, or if compounds with something a little smaller as the first turbo might be better. Or just a single with smaller exhaust side to spool quicker and an external gate to limit drive pressure.

Right now, shows about 1psi by 1500 and 2 to 3 by 1800 with an 085 kit through a 6.0 intercooler.

I remember people talking about playing with an hx35, wonder how that acts down low, or maybe an he351?

 

[franklin2]

So, when does it start showing boost, and what does the gauge do between 1500 and 2k?
A few reasons for asking, have plans of double od here shortly, and curious if that turbo will get me the boost that I am looking for, or if compounds with something a little smaller as the first turbo might be better. Or just a single with smaller exhaust side to spool quicker and an external gate to limit drive pressure.

Right now, shows about 1psi by 1500 and 2 to 3 by 1800 with an 085 kit through a 6.0 intercooler.

I remember people talking about playing with an hx35, wonder how that acts down low, or maybe an he351?

You are going after what the factory has been trying for years with dual turbo's, variable vane turbos, etc. Translation, lots of stuff to fail.

If you want some get up and go, you are going to have to downshift out of all that overdrive. Nothing wrong with that.

 

[Nero]

So, when does it start showing boost, and what does the gauge do between 1500 and 2k?
A few reasons for asking, have plans of double od here shortly, and curious if that turbo will get me the boost that I am looking for, or if compounds with something a little smaller as the first turbo might be better. Or just a single with smaller exhaust side to spool quicker and an external gate to limit drive pressure.

Right now, shows about 1psi by 1500 and 2 to 3 by 1800 with an 085 kit through a 6.0 intercooler.

I remember people talking about playing with an hx35, wonder how that acts down low, or maybe an he351?

I see low boost, even lower the closer I am to 1000rpm.

I was thinking about your post last time I drove my rig and tried to pay attention to mh rpms and boost.

Cruising I am usually at 1600-2100rpm and I typically see about 4-6psi. Mind you, this is no load, empty bed no trailer. I also have a 093 kit with a few mods done, like wastegate delete and 3" down pipe. At max load I see 18psi and fun EGTs.

What is your 'desired' boost?' I'd be aiming more for desired power.

 

[Black dawg]

Not really shooting for any max boost number, just trying to get an idea of turbo response at low rpm. Not really looking for more power than a maxxed turbo pump will provide.

Sounds like by how yours acts, a stock 093 will probably do what I am looking for.

Just looking for turbo response that compliments the natural torque curve of the engine.

 

[WrenchWhore]

Next time I go for a drive i'll try and get some recon for you @Black dawg.

 

[Nero]

I'm definitely very happy with how the 093 performed before going bigger pump and injectors. I'm even happier with the upgraded parts. A 093 on a stock engine really wakes them up!

 

[IDIBRONCO]

A 093 on a stock engine really wakes them up!

Unless you're a big, stupid dummy like the guy who put one on my crew cab and lined up the timing marks and, most likely, didn't turn up the fuel like he should have. I was told that it never built any boost and was a waste of money. There's that lack of knowledge thing again.

 

[Nero]

Knowledge is half the battle my brother.

 

[Dirtleg]

I find there are many variables here. Biggest one is air density. I see much more boost down low with cold air.
Load is a big factor. Spooling is another.
Example, If I know I have a hill coming up, if I get it to spool prior to the load increase from the hill I will see good boost as low as 1600rpm.
If I get the load from the hill before getting the turbo spooled I will see low boost if any, smoke like a 3rd gen Dodge Cummins truck piloted by a wanna-be truck driver with an 18" exhaust tip, and have to back out of it due to my EGT's climbing above 12-1300 really quickly. Then a downshift is required to prevent further loss of momentum.
For clarity I am on a stock Ford/ATS turbo kit I added to an NA engine, 3" downpipe and a Gen 1 (#4) moose pump from 2007.

I really don't see any appreciable boost, under any conditions, below 1500 rpm. Sad but true. On a cold day, turbo spooled and load applied, I've seen 12 psi at 2500 rpm with the stock turbo.

For contrast, my stock 2019 Titan XD 5.0 Cummins will make 20 lbs of boost as low as 1400 rpm all year round. I would love the IDI to even get close to half that. There is a thing about compounds that is just beautiful. Edit, the Nissan isn't compounds. They are sequential. Still kicks a**.

 

[IDIBRONCO]

If I get the load from the hill before getting the turbo spooled I will see low boost if any, smoke like a 3rd gen Dodge Cummins truck piloted by a wanna-be truck driver with an 18" exhaust tip,

I have to laugh SO hard at this. I can just picture the Dodge and the driver!