End all, be all turbo map of GT2540R and GT2871R interlaced!!

[Nowhere]

Look and compare! The GT2540R does flow MORE than the GT2871R on the compressor side...CheersThe 2 SEPERATE maps on the internet (the gt2540r and the gt2871r maps...) are in a DIFFERENT SCALE!!!! The 2540 looks HUGE compared to the 2871. Now that the scales are the same, you tell the difference...

[DeatschWerks]

Great post. But isn't the t2 exhaust side of the GT2540 is too small to fully take advantage of that beefy compressor side?

I like the GT3071R with the .63 AR T3 exhaust side...



but then of course you have to go top mount.

[Nowhere]

Great post. But isn't the t2 exhaust side of the GT2540 is too small to fully take advantage of that beefy compressor side?

I like the GT3071R with the .63 AR T3 exhaust side...

but then of course you have to go top mount.

That's a huge debate on the t2 exhaust side vs the t3 side..

The compressor maps are just that.. COMPRESSOR only...

Here's a wack picture of ALL 3 turbos compared. The GT3071R has a higher peak pressure ratio, looks like the gt30 has a comperable sweet area as the gt2540r..

The larger the exhaust ar/housing/trim, the more exhaust volume/energy needs to be "processed" (not used!!) to turn the compressor wheel the same speed..

I can not offer any input on the REAL WORLD differences between the t2/t3 turbine housings....

An asumption can always be made. A smaller A/R on the turbine = faster spool (more energy USED to turn the compressor). The larger a/r ratios USE the same energy, they need more to "process" (pass through....) to turn the compressor the same speed.

The t2 .64 will spool the fastest out of all of them, HOWEVER, you may reach peak exhaust PROCESSING though (the SYSTEM will be out of it's efficency range (getting close to the surge/choke areas..)). The larger a/r turbine may be required to make peak ENGINE power..

Does that make sense??

Do you want to see a more clear comparison between the GT2540r and the GT3071R (only those two maps) compressors?

[Nowhere]

The end result (not the method to making the correct choice) of the t2/t3 and different a/r are:

The turbine SYSTEM must allow the COMPRESSOR to put out what the engine requires at a specific load. That's why you plot out rpm/load curves on the compressor maps. The correct turbine setup must be chosen to allow the compressor to deliver what the engine needs...

How that's calculated/decided?????????????????????????

[Nowhere]

There's NO standard for compressor map formats. The dimensions of the lb/min and PR are not standardised! That makes the common gt2540r look waaaaaaay deciving vs looking at the gt2871r, as well as the gt3071r...

The maps must be scaled the same to make a good visual comparison..

[Alfa Turbo]

Not so... these maps are generated at standardized 1 bar, so they can be compared.

I see what you are trying to do, however you will get more accurate results by plotting your engines air requirements on each map. I like to plot boost onset (the rpm where you begin to see 3 to 4 pounds), max boost (the rpm where you expect to acheive your max boost setting, this will also be max TQ) and then max rpm. I have an Excel spreadsheet that will do this for you. If you are interested PM me with your email address. I should warn you it is about 5MB with all the maps.

Naturally, this is AFTER you have set a HP goal and defined how you plan to use the car.

[VitaminT]

Please note that the GT3071R compressor map even though the same specs looks different than what was posted above.

It peaks out at a PR of 3.7.

[Nowhere]

Please note that the GT3071R compressor map even though the same specs looks different than what was posted above.

It peaks out at a PR of 3.7.

??

Both the stock and rescaled (changed dimensions, not the data plotted..) are the same?

Where do you find the pr of 3.7 on the gt3071r??

[Nowhere]

Please note that the GT3071R compressor map even though the same specs looks different than what was posted above.

It peaks out at a PR of 3.7.

Very strange?! The first map posted of the gt3071r is different than the http://www.turbobygarrett.com map?!?!?!?! WTF?

I say again, WTF?? They are the same turbo, no? The map of the gt2540r was sourced through ATP, I wonder how accurate it is.....................

[Nowhere]

Big news, the GT2540r map is from the gt2876R turbocharger!!!! Download the GARRETT catalog, on page 29....

WTF is going on??

Why does http://www.turbobygarrett.com not show the gt2540r turbo??

Is the 2540r a hybrid GT series? Using a standard gt25r and using the huge compressor?

I'm lost....

[Nowhere]

Ok, I know what is going on.. I've been on a wild goose chase..

HKS USA owns the "gt2540r" turbocharger.The HKS gt2540r specifications

HKS GT2540R - 360/370 PS OutputCOMPRESSOR:-Wheel- 46 Trim - 51.7 Inducer / 76.2 Major-Housing- 60 Inlet / 50 Outlet - 0.50 A/RTURBINE:-Wheel- 76 Trim - 53.8 Major / 47.0 Exducer-Housing- GT25 inlet / Internal GT25 oulet - 0.64, 0.86 A/R

There is no "garrett gt2540r" turbocharger..http://www.turbobygarrett.com/ Does not recognize the code name "GT2540r" turbocharger....Garrett does not make the "GT2540R" turbocharger..Vendors (mainly http://www.atpturbo.com )advertise a GARRETT "GT2540R" as the following:

Turbine-Wheel: 53mm w/ 62 trim-Housing: .64 ar, .86 arCompressor-Wheel: 60mm w/ 60 trim-Housing: .70 ar

The sales/ads/ebay items listing the "GT2540R" turbochargers are using a marketing gimic. HKS owns the "GT2540R" name, it's VERY VERY expensive, people are advertising a MUCH cheaper alternative.. The name says "GT2540R", but they are NOT HKS USA gt2540r turbochargers..

The end result is this. HKS owns "GT2540R".. People are advertising a "GARRETT GT2876R" turbocharger as a "GT2540R". Compressor maps have been modified (names changed, watermark removed).

The "NON HKS USA" """"GT2540R"""" does not exist.. End of story.Please use/search for a GT2876R in place of a GT2540R..

A lot of posts have been referencing a "GT2540R" as a non HKS USA product (EG. a "garrett gt2540r" turbo, when comparing to a gt2871r...).

I've copied this through all engine forums and the technical forum.I've e-mailed the sellers I could find...

Bryan.

[Sirk]

I'm trying my best to read these maps, I don't really know, but this is what I'm assuming. The PR side is RPM and the flow is how much air it can push? Or, is the PR side the amount of PSI the turbo needs to be at to flow x amount of air?

[Nowhere]

I'm trying my best to read these maps, I don't really know, but this is what I'm assuming. The PR side is RPM and the flow is how much air it can push? Or, is the PR side the amount of PSI the turbo needs to be at to flow x amount of air?

You sir, need to look at garrett's "turbo 103" page.http://www.turbobygarrett.com/....html

The "PR" is the pressure ratio (see garrett..), the lb/min, is the # of pounds of air flow per minute.

Here's the CA forum topic with my better map.zerothread?id=134869

[574-240sx]

I know the garret GT 3071R = GT 2835R hks

Just different naming and I believe the HKS has the elbow. Alot of HKS models are just garrets sold with the HKS name.

[VitaminT]

I noticed some time ago the compressor map of the "Garrett GT2540R" is the same as the now called Garrett GT2876R.

The turbine side of is was never a GT25 though but the GT28 NS111 wheel.

Garrett never listed the GT2540R under their website, I guess due to naming copyrights but they did indeed make the turbo and I don't think it was a ATP/Phoenix Turbo custom hybrid (mainly because many places sell it in the GT2876 form). Keep in mind until recently when garrett started using all thise GTxxxxR naming the 2876 didn't exist (at least in their catalogs).

Oh well I am almost certain the GT3071R with .63A/R T3 turbine is the one for me.

Lastly I have a little simple compressor calculator I made up a while back. Just a very simple excel calculator you can feed desired boost pressure and RPM into and it will tell you the PR and Corrected Air Flow to plot.

It won't tell you when the turbo will spool or anything like that but will at least tell you if at 20psi and 8000rpm you are hanging off the map. If anyone wants a copy just post up and I will email it to you.

[VitaminT]

Forgot to mention...most probably know this...but from what I can tell all of the turbos mentioned here are very lackluster until you get them up around 20psi.

I saw one guy that had a Garrett GT2540R and ran it on low boost until he could afford fuel. I was super dissapointed because it just generally sucked until he could turn it up.

Of if anyone is in that situation get ready.

[Nowhere]

Forgot to mention...most probably know this...but from what I can tell all of the turbos mentioned here are very lackluster until you get them up around 20psi.

I saw one guy that had a Garrett GT2540R and ran it on low boost until he could afford fuel. I was super dissapointed because it just generally sucked until he could turn it up.

Of if anyone is in that situation get ready.

Was that a HKS USA GT2540R or the garrett gt2876r?What a/r did he run on the exhaust?



What were the results after the tuning?

[Nowhere]

Bring out the dead New turbo map of the gt2871R -15 with the 52 trim!zerothread?id=134869