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GT2540 turbo, what family, info needed please 

12 replies to this topic

#1 Whitie_Bear

  • Joined:01-June 06
  • Car:1991 180sx (summer) 1995 ford escort gt (winter)

Posted 31 January 2007 - 09:07 AM

Guys,

i am told that i have a GT2540 turbo on my s13 blacktop sr20det

What in the hell family is this, does it belong with the T25 family or what

for example, say i go to order a wastegate for it, the descriptions always say compatible with T25 T28 etc. what should i look for, what is the gt2540 so i know if its compatible?

WHAT does the GT mean, what does the 25 mean, and the 40 ????

Do i have a garrett turbo that was revamped by HKS thus creating a GT 2540?

So damn confused i just want to know what the hell i have, and what the heck its compatible with and i cant find a damn chart that outlines that anywhere

Also how do i know i have a gt2540 turbo, i know it wont say gt2540 so im guessing i have to go off the trims and such printed on the housings, and if so, can someone tell me what a gt2540 should say hahaha

for the longest time i just thought i had a t25, but saying that isnt 100% correct now is it...if someone has a link to a excellent post or chart i would love you long time for it hahahah

thanks guys

#2 qic200

  • Joined:24-July 03

Posted 31 January 2007 - 09:13 AM

The name GT2540 is a HKS part number, but they have been discontinued as there are newer and better turbo's available now. It will have a T2 flange and it has a 76mm compressor wheel diameter. You may have a Garrett version though which has a number of names such as GT2876R GT2540 ect. The garret version has the big .7ar compressor cover with the 4" bell mouth inlet!!

#3 CHARGER

  • Joined:22-October 03
  • Location:Australia QLD
  • Car:180SX

Posted 31 January 2007 - 09:37 AM

Sounds like you have a Garrett turbo in the GT Series GT2540R also known as GT2876R, A/R 70 front cover with a .64 or .86 rear wheel, I have the .86 version myself. They are classed in the GT25 range and part numbers and specs are as follows: That is ofcourse if you have the garrett, otherwise HKS 2540 are a completely different smaller turbo.

The GT means it is a garrett High Performance turbo and it is Ball Bearing, In between your exhaust and inlet housings where your oil and water lines run if its garrett there will be silver tags with the P/N: listed thats how you tell what it is, or the 4inch bellmouth on the sucker! :P

GT25
P/N: 705330-0001 thats the .64 rear version, 705330-0002 thats the .86 rear version
CHRA P/N: 446179-0018
HSG A/R INTAKE: 0.70
WHEEL TRIM: 48
MODEL: TO4S
WHEEL DIA: 2.09/3.00
HP / PS RATING: 400 / 440
COMP FLOW LBS: 44
HSG A/R Exhaust: 0.64 / 0.86
REAR TRIM: 76
REAR WHEEL DIAMETER: 1.85/2.12

#4 Jum

  • Joined:29-November 04
  • Location:Australia ACT

Posted 31 January 2007 - 09:44 AM

View PostWhitie_Bear, on Jan 31 2007, 09:50 AM, said:

Also how do i know i have a gt2540 turbo, i know it wont say gt2540 so im guessing i have to go off the trims and such printed on the housings, and if so, can someone tell me what a gt2540 should say hahaha

If you can, have a look at the middle bit between the two housings. It should have a little metal plaque thing that says exactly what it is

Im not 100% but if its the HKS version it should have HKS on the compressor housing (mine does)

#5 neil_se

  • Joined:24-April 03
  • Location:Australia QLD
  • Car:S14A

Posted 31 January 2007 - 10:24 AM

How could you get the feeling of a T25 and 2540 mixed up, there should be a massive difference in power :S As above, there should be a tag between the 2 housings with ID and it should have HKS on the compressor housing.

#6 Ca_Silvia

  • Joined:28-April 06
  • Car:1990 Silvia K

Posted 31 January 2007 - 01:24 PM

View Postneil_se, on Jan 30 2007, 07:07 PM, said:

How could you get the feeling of a T25 and 2540 mixed up, there should be a massive difference in power :S As above, there should be a tag between the 2 housings with ID and it should have HKS on the compressor housing.


That and the amount of ridiculous turbo lag between the 2.

#7 Whitie_Bear

  • Joined:01-June 06
  • Car:1991 180sx (summer) 1995 ford escort gt (winter)

Posted 01 February 2007 - 12:58 AM

View PostJum, on Jan 30 2007, 05:27 PM, said:

View PostWhitie_Bear, on Jan 31 2007, 09:50 AM, said:

Also how do i know i have a gt2540 turbo, i know it wont say gt2540 so im guessing i have to go off the trims and such printed on the housings, and if so, can someone tell me what a gt2540 should say hahaha

If you can, have a look at the middle bit between the two housings. It should have a little metal plaque thing that says exactly what it is

Im not 100% but if its the HKS version it should have HKS on the compressor housing (mine does)


like i said, this is my first turbo car i have never had a turbo so this is the first one i feel and it PUNCHES, up around 4750-5000 rpm i really hit the powerband and get tossed the hell back in my seat, so that is some lag but im wondering how bad.....we canadians arent nearly as lucky as you guys over the pond, damn americans are all about big v8's not turbos, hell they like superchargers but its soooooo expensive and rare to buy a factory turbo or supercharged car, not to mention then insurance rapes you to have it on the road, a 21 year old or younger male cant even think to have one, i mean at one point (when i was 16) i was paying nearly $600 a month to insure my FORD ESCORT, no its not a escort like you guys, its like the ford laser tx3 (i think tx3 is the badge) but not awd its fwd and not turbo, same engine as the 323 just not gtr or gtx ie no turbo no awd !!!!! SUCK A$$, but my 180sx is cheap as hell because they dont know its turbo, plus they never asked and hatchbacks are cheaper to insure because there not "sporty" in the eyes of a insurance broker, hell i couldve said coupe but thats expensive and hatchback is cheap

i dont remember seeing a plaque, if there is no plaque then i should look on the housing for HKS, because its probably a hks then? And if there is a plaque and it states whats above then im a garrett

i have to know if my shop ripped me off, so ill go take a look at my baby in storage within the next couple days


Thanks guys, so pretty much once i find out what it is, then im good to know, i think it has a s14/s15 wastegate on it if im correct

#8 Jum

  • Joined:29-November 04
  • Location:Australia ACT

Posted 01 February 2007 - 06:45 AM

If you aren't able to take the turbo off it might be a bit hard to find that little plaque. It could be facing towards the block but even then you could probably use a little mirror (rob your local dentist :P) to see it

I know my one had GT2540 on the plaque. If its the garret version it might have numbers like xxxxxx-x which you would take here and match the numbers up

#9 Whitie_Bear

  • Joined:01-June 06
  • Car:1991 180sx (summer) 1995 ford escort gt (winter)

Posted 01 February 2007 - 07:26 AM

View PostJum, on Jan 31 2007, 02:28 PM, said:

If you aren't able to take the turbo off it might be a bit hard to find that little plaque. It could be facing towards the block but even then you could probably use a little mirror (rob your local dentist :P) to see it

I know my one had GT2540 on the plaque. If its the garret version it might have numbers like xxxxxx-x which you would take here and match the numbers up


Thanks, ill try to get a look

#10 discopotato03

  • Joined:23-January 07
  • Car:R33GTS25T

Posted 01 February 2007 - 08:29 AM

Actually HKS GT BB turbos will have an ID tag on the bearing housing , all these and the Garrett marketed GT BB turbos are made by Garrett Japan .

The numbering system is where everyone gets confused . In the beginning al those GT2x BB turbos were called GT25 xx ie GT2510 , GT2530 , GT2535 , GT2540 . Nowdays that turbine (except in the GT2510) is known as a GT28 of the NS111 family of turbines . There are HEAPS of turbos using that turbine and you could argue that they are all GT28's . The cartridge sub family is 446179-XXXX , the numbers substituted by the X's tell you about which compressor wheel the turbo has . The HKS "GT2540" is a bit of a strange designation because it uses what is now known as a GT28 turbine with a TO4E 46 trim compressor - nothing GT40 about it at all . You could say its a GT28/TO4E R . Anyway its irrelivant because they are out of production (as is the GT2510) which is good because they were poor performers - replaced by the GT-RS which is a tarted up GT2871R 52T and GT-SS which is a variation of the GT2860R theme in SR20 applications .

BTW people GT stands for Garrett Technology and the "R" stands for rolling element ball bearing centre section .

#11 Whitie_Bear

  • Joined:01-June 06
  • Car:1991 180sx (summer) 1995 ford escort gt (winter)

Posted 01 February 2007 - 08:40 AM

View Postdiscopotato03, on Jan 31 2007, 04:12 PM, said:

Actually HKS GT BB turbos will have an ID tag on the bearing housing , all these and the Garrett marketed GT BB turbos are made by Garrett Japan .

The numbering system is where everyone gets confused . In the beginning al those GT2x BB turbos were called GT25 xx ie GT2510 , GT2530 , GT2535 , GT2540 . Nowdays that turbine (except in the GT2510) is known as a GT28 of the NS111 family of turbines . There are HEAPS of turbos using that turbine and you could argue that they are all GT28's . The cartridge sub family is 446179-XXXX , the numbers substituted by the X's tell you about which compressor wheel the turbo has . The HKS "GT2540" is a bit of a strange designation because it uses what is now known as a GT28 turbine with a TO4E 46 trim compressor - nothing GT40 about it at all . You could say its a GT28/TO4E R . Anyway its irrelivant because they are out of production (as is the GT2510) which is good because they were poor performers - replaced by the GT-RS which is a tarted up GT2871R 52T and GT-SS which is a variation of the GT2860R theme in SR20 applications .

BTW people GT stands for Garrett Technology and the "R" stands for rolling element ball bearing centre section .

Thank you that was very helpful

so when im looking for a HKS actuator kit, i have to make sure its compatible with a t28 ? or do i have to look for something compatible with gt25 or gt28?

#12 discopotato03

  • Joined:23-January 07
  • Car:R33GTS25T

Posted 01 February 2007 - 12:28 PM

Where it gets tricky with those is how the actuator mounts to the compressor cover . You may find that electronic boost control is better because you can at least have the boost back to std if required , something you can't do with a higher rated actuator .

Cheers A .

#13 Whitie_Bear

  • Joined:01-June 06
  • Car:1991 180sx (summer) 1995 ford escort gt (winter)

Posted 02 February 2007 - 01:04 AM

Indeed, but thats not what i was worried about, because i bought a turbotech controller .. i want to install it but if i have spiking problems, ill know its probably the actuator then ill have to replace it

but thanks for the heads up, good to remember





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