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...Cheers

The 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...


Modified by Nowhere at 8:06 PM 1/26/2006

[Fenvy]

what if it's the .86 a/r for the gt2871r instead of the .60?

[float_6969]

Cuz then it's not apples to apples. This is the closest comparison that you can make.

[Nowhere]

what if it's the .86 a/r for the gt2871r instead of the .60?

Uhh, turbo maps are only for the compressor side. I could not tell you the spool curve/rate/start/profile of any of the 8 turbine setups (4 for each, 2 each for t3 and t2).

You're comparing coke bottles to wallpaper.. The .86 is a turbine setup for either one for the t3 mounting flange.. The 60 is the compressor side..Options:compressor/turbine a/r ratios..gt2540r.70/.63, .70/64, .70/.82, .70/.86GT2871r.60/.63, .60/64, .60/.82, .60/.86

I'm doing more searching on the net, I'm seeing different trim levels..... Rrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.....

Post back in a while with more facts..

The differences between the TURBINE .6X and .8X series seems to be ~~ 40 ~ 60 TOP END horsepower..

[CA19DET]

dunno, but the .86 GT2540Rspools at over 5k rpm on the CA and the GT2871R seems to spool way quickler on every other engine compared to the GT2540R so my money is still on the GT2871R in all trims and A/R to be better than the GT2540R, i was about to buy a GT2540R and swaop on a .64 A/R GT25 Trubone and run it with an external gate, but seeing dynos of the same engines with booth - the obvios choice is the GT2871R...

[Fenvy]

Uhh, turbo maps are only for the compressor side. I could not tell you the spool curve/rate/start/profile of any of the 8 turbine setups (4 for each, 2 each for t3 and t2).

You're comparing coke bottles to wallpaper.. The .86 is a turbine setup for either one for the t3 mounting flange.. The 60 is the compressor side..Options:compressor/turbine a/r ratios..gt2540r.70/.63, .70/64, .70/.82, .70/.86GT2871r.60/.63, .60/64, .60/.82, .60/.86

I'm doing more searching on the net, I'm seeing different trim levels..... Rrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.....

Post back in a while with more facts..

The differences between the TURBINE .6X and .8X series seems to be ~~ 40 ~ 60 TOP END horsepower..

hehe I don't understand this thing at all... it's all picasso to me

[Nowhere]

dunno, but the .86 GT2540Rspools at over 5k rpm on the CA and the GT2871R seems to spool way quickler on every other engine compared to the GT2540R so my money is still on the GT2871R in all trims and A/R to be better than the GT2540R, i was about to buy a GT2540R and swaop on a .64 A/R GT25 Trubone and run it with an external gate, but seeing dynos of the same engines with booth - the obvios choice is the GT2871R...

I agree on the .86 being WAAAY TOO HUGE, but with the .64???

I'm interested in DYNO ##'s between the GT2540R and the GT2871R with the t2 .64 exhaust housing....

I'm going to plot some numbers...

I am also going to look into the various trimmed gt2540r units out there. Web sites are advertising different specs for the gt2540.. ALL the compressors should be the same?!?!?! 44lb/hr..

gt2540rTurbine-Wheel: 53mm w/ 62 trim-Housing: .64 ar, .86 ar-Maps: Not Available

Compressor-Wheel: 60mm w/ 60 trim-Housing: .70 ar-Maps

2871Turbine-Wheel: 53.85mm w/ 76 trim-Housing: .86 ar-Maps

Compressor-Wheel: 71mm w/ 56 or 48 trim-Housing: .60 ar

Still looking..

[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.

[CA19DET]

allot of them have it listed as the GT25R or the GT25/40R and say the GT25 si the turbine and the '40' is the T4 housing.. marketing...

[Fenvy]

so what does this mean? say it in plain english...

GT2540R owns gt2871r?

[Nowhere]

so what does this mean? say it in plain english...

GT2540R owns gt2871r?

Nope, The HKS GT2540R is by the GARRETT GT2876R turbocharger.HKS USA acctually "owns" the "GT2540R"... It's a custom HKS product..

Any and ALL references to a """GT2540R""" should be towards the HKS USA unit.

Based on my searching here @ nico and on other forums, people are confusing the real HKS USA GT2540R turbocharger with the GARRETT GT2876R turbo (this is when they bring up the GT2871R for questioning..).

The HKS USA GT2540R indeed uses a "T25" ball bearing center cartridge, while the GARRETT GT2876R uses the larger "T28" ball bearing center cartridge.

Here's the specifications from Garrett on the GT2876R:

http://www.turbobygarrett.com/...1.htm

Here's the specifications from HKS USA on the GT2540R:

http://www.hksusa.com/products/?id=707

[CA19DET]

IMO Garrett doesnt really reccomend the GT2876R aka GT2540R, it strongly reccomends the GT2871R

GT2876Rhttp://www.turbobygarrett.com/...1.htm

GT2871Rhttp://www.turbobygarrett.com/...5.htm

i think the newer 71mm turbine is the more efficient of them all. the 76mm one may be bigger but tis laggier and really doesnt make much more power combined with the compressor onteh GT2540R or GT2876R or whatever,,,

IMO get the GT2871R - 472560-15(.64 A/r Turbine)

[Nowhere]

IMO Garrett doesnt really reccomend the GT2876R aka GT2540R, it strongly reccomends the GT2871R

GT2876Rhttp://www.turbobygarrett.com/...1.htm

GT2871Rhttp://www.turbobygarrett.com/...5.htm

i think the newer 71mm turbine is the more efficient of them all. the 76mm one may be bigger but tis laggier and really doesnt make much more power combined with the compressor onteh GT2540R or GT2876R or whatever,,,

IMO get the GT2871R - 472560-15(.64 A/r Turbine)

They don't list a compressor map on the new 2871r "15" model.. I'm curious as to what's soo good about it vs. the others?

My basic asumption was,same turbine, larger compressor = more powah! The 2876R does flow MORE than the 2871..

Hmph.. I don't know..

I'll have to post my compressor plots on both of them..

[rbsileighty]

IMO Garrett doesnt really reccomend the GT2876R aka GT2540R, it strongly reccomends the GT2871R

GT2876Rhttp://www.turbobygarrett.com/...1.htm

GT2871Rhttp://www.turbobygarrett.com/...5.htm

i think the newer 71mm turbine is the more efficient of them all. the 76mm one may be bigger but tis laggier and really doesnt make much more power combined with the compressor onteh GT2540R or GT2876R or whatever,,,

IMO get the GT2871R - 472560-15(.64 A/r Turbine)

71mm is the exducer diameter on the compressor not the turbine, but I do agree it is a very eff turbo.

I have ridden in WRX that is equipped with one and needless to say that even with a MAP setup that was not totally in tune... it has some serious response/spool... and pulls really well with the 2.0L. I could imagine this would be an excellent turbo for a 1.8L since the WRX might be better with the GT3071R and still have good response.

The key to these two turbos, in my opinion, is eff and balance. The one thing not shown on the GT2540 or GT25/40 map (whatever it is) are eff. numbers... which should not be overlooked. This along with the energy required to spin a large compressor in an unbalanced turbine/compressor match-up... makes for a less than optimal setup... as seen in the GT2540... and the aussie guys who have run this turbo are not a big fan of it... they tend to opt for the GT2530 from HKS instead. The GT2835 from HKS is also a good turbo, but it is more like the GT3071R than the GT2871R from the numbers in the comp and turbine.

If I were spending the money... I'd say GT2871R over the HKS GT2540 hands down.
Modified by rbsileighty at 4:24 PM 9/12/2005

[capwred]

well im going to be spending the money very soon .after some more research and i think im going to go with the gt2871r with the .64.i think it will do what i want it to do.

[Nowhere]

71mm is the exducer diameter on the compressor not the turbine, but I do agree it is a very eff turbo.

Hhe, I meant to say compressor. The turbines in the GT28 series are all the same, ....... the .64 or the .86......

I have ridden in WRX that is equipped with one

A HKS USA GT2540R or a GARRETT GT2876R?? What a/r on the turbine (big or little??)

The key to these two turbos, in my opinion, is eff and balance. The one thing not shown on the GT2540 or GT25/40 map (whatever it is) are eff. numbers...

??? The Eff islands and ##'s are listed on garrett's site (the 1st picture I posted does not show eff ##'s... Look @ the links above for the GARRETT maps on the gt2876r and the gt2871r)The HKS USA GT2540R does not have a compressor map.. Any reference I make is to a garrett turbo, it's about 1,500 cheaper!!

This along with the energy required to spin a large compressor in an unbalanced turbine/compressor match-up...

The specifications between the GARRETT gt2876r and the gt2871r are pretty close.. The 2876R does flow more though.

as seen in the GT2540...

The HKS or garrett??

The aussie guys who have run this turbo are not a big fan of it...

Again, the HKS or Garrett?? Garrett Does NOT make a gt2540r..

they tend to opt for the GT2530 from HKS instead. The GT2835 from HKS is also a good turbo, but it is more like the GT3071R than the GT2871R from the numbers in the comp and turbine.

Those HKS USA units are EXPENSIVE!!!!!!!!!!! Waaaaay too much money for my blood..

If I were spending the money... I'd say GT2871R over the HKS GT2540 hands down.

I agree 100%The HKS is waaaaaaaaaaaaaaaaay to expensive.What are your thoughts on the larger compressor setup on the GT2876R though????

[Nowhere]

Here's a corrected (same scale) and colored eff % compressor map on the GT2871R series and the GT2876R (only one trim avail).There's a NEW gt2871R compressor that has a faster responce, I have NO idea what the map is going to look like...Do you want the RPM plots on the GT2876R? Garrett fubared the GT2876R map by either resizing or ditering (the lines look like crap, took about 3 hours to fix... Garrett.

More information anyone??Use this link for turbo compressor map plotting (figuring out what turbo will work for you..).http://www.turbobygarrett.com/....htmlI've used an 80% intercooler, 300hp estimates, .55 BSFC, 7000rpm, and .92 for the VE..

[CA19DET]

off the top of my head i always remembered that SCC did the same math in suck squick bang boom article and a 1.8L @ 20psi = ~35lb/min and 2.4pr, always use that as my first glance to see where that puts my lil engine on the compressor map.. once above ~70% i would normally do the math to eb certian..

so someone do the math so i cdont have to...

but i know less boost moves the lb/min lower (to the left)..

and as you can see anything above about 22-24psi is really pushing the limits of the compressor far less the GT25 turbine..

[rbsileighty]

Ok, here's the deal...

First... what's your hp goal and where is peak tq made on the CA with whichever cams and intake manifold you are running?

With quick calculations (program I made for my TI-89 a while back... quick way to plot compressor maps, let me know if anyone wants it) plotting a box on the comp map with the mass flow numbers...

1.8L w/ 150F inlet temp

0 psi - 1 P2/P1 - 1000rpm - 2.15 lbs/min

0 psi - 1 P2/P1 - 6500rpm - 14.02 lbs/min

10 psi - 1.7 P2/P1 - 3500rpm - 12.68 lbs/min

15 psi - 2.02 P2/P1 - 3500rpm - 15.25 lbs/min

15 psi - 2.02 P2/P1 - 6500rpm - 28.32 lbs/min

18 psi - 2.22 P2/P1 - 6500rpm - 31.18 lbs/min

22 psi - 2.5 P2/P1 - 6500rpm - 35 lbs/min

Take this to the compressor map and you'll see that the 56 trim 71 looks like it covers more of the eff area with a 1.8L... the with room for more boost up to 22psi unlike the 76R.

This is my opinion... hope it helps

[rbsileighty]

Actually... take a look at the GT3071R map... might be a better fit when plotting the numbers

http://www.turbobygarrett.com/...e.gif

[float_6969]

Just from first glance of the maps, the 48 trim just plain LOOKS like a better map. although the "island" may have a smaller total area (it's got to be close), the surge limit is much more linear and the effeciency area is wider across.

If I had to pick from those two, hands down, it would be the 48 trim.

[rbsileighty]

Plot the points... the turbine is the same... so it should spool the same (depending on comp wheel mass)... I'd say 56 trim 2871 for a good midrange power turbo... or a GT3071 if you want the high end... but looking at the turbine map it looks like the 30 might be a bit big. Don't underestimate effs...

The 56 allows room to grow... and has most all points in the eff... chances are the points will shift to the right if you can get the inlet temp under 150... or VE changes... I'd say 56 2871 is your best bet for 300 range power.
Modified by rbsileighty at 7:05 PM 9/13/2005

[Nowhere]

360hp/25psi, go with the gt2871r 56 trim320hp/20psi, go with the gt2871r 48 trim360+hp/HIGH boost, GT3071R 56 trim

(finished plotting like 60 points..)

Larger displacement = gt2876R (the 1.8 is going to be too close to the surge line...)

.64 a/r on the compressor housings. Seems the larger a/r housing would be best for the gt3071r.

Do you think the .64 exhaust would support the 320/360hp?

Now, a manifold that will support that large compressor??

[rbsileighty]

Crank or wheel hp?

[Nowhere]

Crank or wheel hp?

Crank powah

[rbsileighty]

I would say a .64 would be your best bet...

[Nowhere]

Would the SSAC bottom mount manifold support the GT2871R turbo charger??

Stock manifold on the GT2871R??

Options?

SSAC t3/t4 topmount with a t3 to t2 adapter plate?Cut off the flange and reweld a t2 adapter??

[rbsileighty]

I'm not a big fan of SSAC... I've heard bad things about the quality, but you'd have to hear from someone who owns one. Do it once do it right...

[Nowhere]

Bring out your dead

The new GT2871R-15 turbo map is out!!!!!http://www.turbobygarrett.com/...5.htm

It's got a 52 trim vs. the smaller 48 or the larger 56!

LOOOOOOOOOOOK @ the eff% range! Unless garrett is smoking crack, the turbo has a HUGE 75% eff area (map really shows 76% and 75%...).Looks like the right turbo for the ca18det

Strange though, the exhaust eff% drops to 60% vs. 66 or 72% shown on the 56 and 48 turbo setups? WTF garrett ?

Enjoy the new picture!

[Kouks]

yes it is awesome, the .64 ar gt2871r wins hands down for price and efficiency!