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stock boost level on stx550
  #1  
Old 28-08-2017, 04:10 PM
BMGTZ BMGTZ is offline
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Default stock boost level on stx550

Hi all

I'm thinking of getting an ecu flash tune done and the guy wants to increase the boost.

what is the factory boost level?

will they reliably handle 2 or 3 psi more?

I am mainly chasing a bit "more" under 2500rpm. I seldom rev it very hard so increases above 3000rpm wont be relevant.

what are people experiencing with these tunes?

Recommended shops in perth?

brian
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  #2  
Old 21-07-2018, 01:57 PM
Fgk228 Fgk228 is offline
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Stock I have seen 22.4psi.

Have a look at an exhaust first. Ppd do them for $500 and new hot side inter cooler pipe will also assist with low rpm power.

I would do at least both of these before you drop the coin on a tune. Also get them to turn all the egr off.
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  #3  
Old 26-07-2018, 06:43 AM
TomAu TomAu is offline
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Quote:
Originally Posted by Fgk228 View Post
Stock I have seen 22.4psi.

Have a look at an exhaust first. Ppd do them for $500 and new hot side inter cooler pipe will also assist with low rpm power.

I would do at least both of these before you drop the coin on a tune. Also get them to turn all the egr off.
I am interested. What is PPD and what are they doing for $500?
Regards,
Tom
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Old 26-07-2018, 09:44 AM
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Quote:
Originally Posted by TomAu View Post
I am interested. What is PPD and what are they doing for $500?
Regards,
Tom
I read it as - PPD ( brand/supplier) do an exhaust for $500
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Old 26-07-2018, 09:46 AM
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https://ppdperformance.com.au/collections/nissan/d40
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  #6  
Old 26-07-2018, 11:32 AM
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DIRECT Dent Repair DIRECT Dent Repair is offline
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Quote:
Originally Posted by BMGTZ View Post
Hi all

I'm thinking of getting an ecu flash tune done and the guy wants to increase the boost.

what is the factory boost level?

will they reliably handle 2 or 3 psi more?

I am mainly chasing a bit "more" under 2500rpm. I seldom rev it very hard so increases above 3000rpm wont be relevant.

what are people experiencing with these tunes?

Recommended shops in perth?

brian
Hi
Im seeing high 29psi in mine.
100 000 kms all mods no tranny issues like some.
10k service intervals.
want bigger turbo.
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  #7  
Old 31-07-2018, 10:44 AM
Fgk228 Fgk228 is offline
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Quote:
Originally Posted by DIRECT Dent Repair View Post
Hi
Im seeing high 29psi in mine.
100 000 kms all mods no tranny issues like some.
10k service intervals.
want bigger turbo.
Whatís the details on you tune and mods?

Iím just about to get a tune.
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  #8  
Old 03-08-2018, 08:02 AM
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DIRECT Dent Repair DIRECT Dent Repair is offline
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Quote:
Originally Posted by Fgk228 View Post
Whatís the details on you tune and mods?

Iím just about to get a tune.
Intake from AAA Fab.
Dump pipe and high flow cat, 3 inch system
HPD intercooler kit.

Be careful on who tunes your truck because 90% are slave tuners and dont write the tunes. They purchase tunes to suit and don't really know what they're doing.
What can I say. Turbo at max 17:1 AFR. A little sootish off boost but otherwise ok.
Could fatten her up a little to 16:1 afr and would see an increase in rwkw again but im not keen on the soot out back.

Id love to change turbo to one that could hold boost a little longer but this means engine out and I'm not keen on that.
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  #9  
Old 07-08-2018, 10:33 AM
Fgk228 Fgk228 is offline
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Quote:
Originally Posted by DIRECT Dent Repair View Post
Intake from AAA Fab.
Dump pipe and high flow cat, 3 inch system
HPD intercooler kit.

Be careful on who tunes your truck because 90% are slave tuners and dont write the tunes. They purchase tunes to suit and don't really know what they're doing.
What can I say. Turbo at max 17:1 AFR. A little sootish off boost but otherwise ok.
Could fatten her up a little to 16:1 afr and would see an increase in rwkw again but im not keen on the soot out back.

Id love to change turbo to one that could hold boost a little longer but this means engine out and I'm not keen on that.

This bloke tunes it him self on the dyno.

What kw are running.
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  #10  
Old 08-08-2018, 08:49 AM
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Quote:
Originally Posted by Fgk228 View Post
This bloke tunes it him self on the dyno.

What kw are running.
189rwkw
REMEMBER THAT THESE DIESELS RUN VARIABLE VANE TURBOS.
AS LONG AS YOU GET A GOOD INCREASE IN DRIVABILITY YOU SHOULD BE HAPPY.
BUT THIS IS WHERE THE TUNER COMES INTO PLAY.
TORQUE LIMITERS
INJECTOR TIMING
RAIL PRESSURE
SMOKE MAPS
DRIVERS WISH
BOOST PRESSURE
EGR OFF
DPF OFF (ON SOME VEHICLES)

IVE HAD MORE RWKW WHEN WE FATTENED HER UP ON DYNO TO SEE OUTCOME BUT COULDN'T ADD MORE AIR AS TURBO AT LIMIT.
THESE TURBO'S ARE VARIABLE VANE AND HAVE NO WASTE GATE. THE EGR ACTS AS A WASTE GATE SO IF YOU TURN THE EGR OFF IN TUNE YOU WILL GET COMPRESSOR SURGE UNDER LOAD AT LOW RPM.
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