Garrett Gt28RS, anyone running it?

[Daidae]

I've got a .86 AR GT25R, how does it compare?

It's supposed to be good for 450hp, i've seen it at 396whp....

Specs:

Turbine Wheel: 53mm w/ 62 trim Housing: .86 ar

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

The specs you just gave are the GT25/40R, and not the true Garret GT25R. GT25R is not going to give you 450hp, but the GT25/40R with .86 AR will support that.

[Daidae]

do you have this in excel format by chance?????? PLease?????

Dude, you are just being lazy! Just retype the whole thing! j/k

I'm at work now, and do not have the data with me.I'll send it all of you in 7 hours or earlier.

[pampadori]

the gt25r is a 250hp turbo.

the gt2540r is the one that has a 44.bs/min wheel and can do a little more the 400whp. it used to be called the gt25r. hense the confusion and people buying turbos that will never make the power they want.

the gt28r is a good 310hp turbo that spools super fast. this is the same as the s14 t28bb. (exact same)

the gt28rs is a great turbo that can do around 340hp. spools fast aswell. you can run them at 22psi or so on a sr with around 320hp. it uses a to4b housing that is a good bit understated if you see it beside a the t04s thats on the gt2540r.

then there is the jgybb37 which is a great turbo that garrett has decided to start making! bastards! they call it the gt2871r now. kinda flatering to know that garrett liked a turbo that i had been making for over a year enough to produce it. the good out of this is that now we can sell these much much cheaper then before. from the outside it looks just like the gt28rs. same housings.

we have been making a larger turbo for about a year too that is called the jgybb37r. while we haven't dynoed it on a US car, seat of the pants impressions tell us at 22-24psi, we are sitting around 400-430whp. its installed in a few customer cars we did and also in our drag b13 se-r. it also uses the same housings as the gt28rs. it could be used with a t04e or a t04s housing also, but we use the b housing for space issues on the se-r cars.

so there is a comparision of a few turbos that "look" the same.

and i don't think the gt28rs is a pos. its just a little small for most tastes. Shaun

[Daidae]

I'm not knocking the GT2871R, but it looks like it best for straight runs. If you look like at the dynocharts from ATP, the GT28RS with give the GT2871R a good run for it's money on a twisty race track.

ATP Dyno Chart:

[pampadori]

your right, small turbos spool faster. but they run out of steam a lot sooner. lets pretend you are shifting at 7200rpm in the car above on the dyno. where does the next gear put you? 5800 or so. looks like the bigger turbo makes more power throughout the race.

[Daidae]

Only if the GT28RS didn't pass you on the turn, and is constantly in your way!:D

[pampadori]

true :0). there wouldn't be a gt28rs car infront of me though. :0)

[f150intally]

shaun, on the jgybb37 at what rpms are you guys reaching 22psi?

[240SXer]

I don't know about the GT25R vs GT2540R, I know there is a little 250hp GT25R turbo. I have the GT2540R.... It's about $1100 and supports 450hp. It's better than the disco if you ask me.

[Def]

I'm not knocking the GT2871R, but it looks like it best for straight runs. If you look like at the dynocharts from ATP, the GT28RS with give the GT2871R a good run for it's money on a twisty race track.

ATP Dyno Chart:

But that dyno was done with a pretty small engine that probably has a corked off exhaust tract. A GT28RS isn't that big of a turbo, so it hitting full boost in the 4.5k RPM range points to a mighty small engine.

Taking into account that a 2.0L engine will spool up a GT2871R just slightly after a GT28RS(200-300RPM or so?), but make a good deal more torque all the way to redline, I think it looks like a better solution for someone wanting 320-350rwhp. Plus I'm not sure of the turbine A/R on that dyno.

I'd think a 0.64 A/R turbine GT2871R would tend to spool pretty close with a 0.86 A/R GT28RS, but make more power due to more compressor headroom. Power might drop off above 6.5k RPM due to increasing exhaust pressure in the exh manifold, but I'd be shocked if you didn't make more power than the DP all the way to redline with the 0.64 A/R GT2871R.

To me it kinda seems like a 0.86 A/R turbine is a bit large for the compressor on the GT28RS. 300-310rwhp seems well within the ability of a 0.64 A/R housing's flow capacity without killing power.

[LSB_11]

so with all that said, what would be your ultimate turbocharger for the sr20det redtop with the supporting modifications to get around the 350whp range, best spool, best hp, best torque, with whatever boost. and if you want to get really crazy, put how much it would cost.

my vote is for the GT28RS, i like to have a turbo spool ASAP, and i will be happy with BB setup and 350hp. plus i like the rediculous nick name. i have found the turbo for about 900 shipped+ oil lines.

[Def]

I'd say a GT2871R with a 0.86 A/R housing would do 350ish rwhp. The 0.64 A/R might do it with a little faster spool, but you'd have to definitely get some supporting mods(intake manifold, mild cams) to get your volumetric efficiency up at high RPM.

The GT2540R with a 0.64 A/R turbine will do 350rwhp, but I'd tend to think it laggier than any itteration of the GT2871R. Might be close to the 0.86 A/R GT2871R in spool though.

I don't see a GT28RS putting out 350rwhp... ever. It can do 350hp at the crank if you run the thing into the ground efficiency wise, but you'll be dealing with alot of heat doing that, so I think it'd be restricted to street and drag racing duty.

Where'd you find it for $900 shipped(is that including oil lines?)? That's a killer price - share the knowledge!

[s13sr20chris]

good thread!

[f150intally]

guys there is another thread regarding the install of this turbo on another large nissan forum. I know it is not polite to refer to other forums on this one but it is a pretty valuable thread as far as insight on the gt2871r.

gt2871r thread

mods please forgive me but it is a very relevant thread to this topic.