Garrett GT28R / HKS GT2835

[[email protected]&r]

Has any one run ether of these turbos ???
I know everybody has an opinion but I would prefer fact.
Thank you

[DuffMan]

Well this isn't based on experience, but I'll open my big mouth anyways. :p

The standard off the shelf GT28R is basicly a stock S14 T28. Not even in the same class as the HKS. However, there are other turbos in the garret GT family, like the GT28RS, GT2871R, and GT25/40 (also called the GT25R sometimes) which compete with it.

Overall, I think the HKS GT2835 is the best t25-based turbo you can get, but neccessarily the best turbo for the money.

[FRpilot]

i thought most of garett's GT turbos were almost the same as HKS' GT series turbos.

[DuffMan]

They are, but these two turbos are the wrong match up.

The Garrett GT28R is basicly a HKS GT2510 or HKSGT2530.

The HKS GT2835 is kind of unique though, because HKS uses a shaved down (T3?) turbine wheel in a modified T25 turbine housing. It's closest Garrett cousin is the GT2871R which has a similar compressor but the same old stock t25 turbine wheel.

Sometimes people say GT25R or GT28R without really being specific as to which garret turbo they are refering to, because there are really GT25 and GT28 families that include a range of different turbos with different power capabilites.

[Joel 180]

GT and HKS turbos do not match up. HKS wheel specs are closely guarded and although their turbos share similar names, they are very different. If you compare a Garrett GT2510 with a HKS GT2510, the HKS will out perform the Garrett.

Also Nissan confused everyone with the T28. The Garrett Nissan S15 BB T28 turbo is actually a Garrett GT2510. The GT28 family of turbos are a lot bigger.

To answer the question, The HKS GT2835 is a good turbo. Denzos 'Hyper Wanker' 180 uses it.
http://www.japanesemotorsport.com.au/denzo180sx.html

[[email protected]&r]

Thank you for the responses but. Has any one run either of these turbos. I'm curious how they spool up in real life. I know how to do the math but. The math is an ideal condition the real world is something else.

Also I know HKS is an awesome manufacturer but. Who do you think makes there turbos ? Chances are that Garrett builds them a proprietary center section (including wheels) and then HKS put their own housings on it. Nissan GTP cars ran Garrett exclusively from 89-93 and all of CART still uses Garrett only. The HKS 2835 turbo may be the perfect turbo due to the fine tuning that has been done. The Garrett GT2871R turbo may not be exactly the same. The fact still remains I have the Garrett compressor map and the turbo will comfortably make 400-425 H.P. at the flywheel and still be fairly efficient. Lets look at it from one other stand point. Money!!! Most people who have a car habit do not have a dump truck full of hundreds and fifties. I would rather make a compromise. For the price of the HKS 2835. I could buy a Garrett GT2871R and a set of injectors. The opinions here are mine and not meant to stir up any B.S. Also this is how posts get off topic.

[ruf]

Everyone knows that Garrett builds the HKS turbos. They probably cast the housings for them too. But they are not allowed to duplicate the design in their own branded turbos.

[DuffMan]

Originally posted by Joel 180
GT and HKS turbos do not match up. HKS wheel specs are closely guarded and although their turbos share similar names, they are very different. If you compare a Garrett GT2510 with a HKS GT2510, the HKS will out perform the Garrett.

Also Nissan confused everyone with the T28. The Garrett Nissan S15 BB T28 turbo is actually a Garrett GT2510. The GT28 family of turbos are a lot bigger.

To answer the question, The HKS GT2835 is a good turbo. Denzos 'Hyper Wanker' 180 uses it.
http://www.japanesemotorsport.com.au/denzo180sx.html

OMG that is the biggest full of shat post I have ever read! HKS wheel specs are on the frickin HKS USA WEBSITE. HKS and Garrett don't use the same part numbering systems. WTF is a Garrett GT2510?

The GT28 series is not bigger than Nissan's T28.

[DuffMan]

Originally posted by ruf
But they are not allowed to duplicate the design in their own branded turbos.

Thats not really true. Some HKS turbos have exact equivalents available.

[ruf]

Originally posted by DuffMan
Thats not really true. Some HKS turbos have exact equivalents available. They can be specced the same, but a lot of the centers and blade designs are proprietary. While SOME of the HKS turbos may directly cross-reference with Garrett equivalents, the majority of the new line stuff has a different design regardless of the similar specs on the housings and trims.

[DuffMan]

The blade design is a Garrett GT blade. What you are saying was true a few years ago, but isn't anymore, now that garrett GT turbos are starting to trickle into retail channels.

The 2835 is still unique as far as I know. But all the HKS turbos are in the garrett catalog and you can cross reference the part numbers for the wheels and see that they are the same as Garrett retail ones.

[Joel 180]

Originally posted by DuffMan
OMG that is the biggest full of shat post I have ever read! HKS wheel specs are on the frickin HKS USA WEBSITE. HKS and Garrett don't use the same part numbering systems. WTF is a Garrett GT2510?



They are now on the the website becasue they have release the GT specs after 10 years. Their new turbo specs are not available.

I never said they use the same numbering systems, I said they use similar numbering systems which causes a lot of confusion.

The garrett GT series of turbos are ball bearing turbos. The range includes GT2510, GT2530, GT2535, and GT2540
Specifics for the GT seris can be found here: http://www.turbofast.com.au/GTseries.html
And here:
http://turbotech.com.au/garrett4.htm
And here:
http://www.cypherindustries.com.au/catalogue/catpages/turbo/turbo.php

HKS GT series here:
http://www.bd4s.com.au/hks%20turbo%20GT.htm


The GT28 series is not bigger than Nissan's T28.

HKS GT2835R
0.5 A/R comp 56 trim
0.73 A/R exh 90 trim
rated 420PS

Nissan (Garrett) OEM T28
0.6 A/R comp 60 trim
0.64 A/R exh 62 trim
rated 300PS

[DuffMan]

Ok you really have your garrett and HKS turbos confused.

Go to the websites you posted. There is no such thing as a Garrett GT2510, GT2530, GT2535, and GT2540. There are Garrett GT25 and GT30 ect. FAMILIES of turbos.

When I was said "The GT28 series is not bigger than Nissan's T28" I was reffering to the GARRETT GT28. The specs on that turbo are as follows

TURBINE SPECS: T25
.64 A/R Turbine Housing
62 Trim Turbine

COMPRESSOR SPECS: T3
.60 A/R Housing
60 Trim Wheel


Also there is a kind of unofficial simplified system that retailers use such as GT25R GT28, to describe the more prevalent GT series garrett turbos.

[[email protected]&r]

Since this post has gone off on a tangent. I called SP Engineering and asked them how the HKS GT2835 performed in a real world application. Hue at SP told me that he has put several of the HKS GT2835's on S13 motors. He also told me that the turbo starts making good boost at about 3500 rpm. With a set of HKS cams they have seen the turbo will make power to about 8000rpm.

Now as for the rest of the stuff I found out. I talk to John at Limit Engineering a Garrett dealer. This guy can find specs on anything. He even found the part # for the HKS 2835 center section same wheels same trims anybody can buy it. You can also get the the same compressor housing from Garrett. But he could not find the turbine housing.


HKS 2835R

Compressor
Wheel 56 trim - 53.1 inducer / 71.1 major
Housing 100mm inlet / 50mm outlet .50 A/R
Turbine (internal gate)
Wheel 90 trim - 56.5 exducer / 56.5 major
Housing T25 inlet / 90 trim / .86 A/R


Garrett GT2871R


Compressor
Wheel 56 trim - 53.1 inducer / 71.1 major
Housing 75mm inlet / 50mm outlet .50 A/R
Turbine (internal gate)
Wheel 76 trim - 47.0 exducer / 53.5 major
Housing T25 inlet / 76 trim / .84 A/R

The specs on the HKS turbo are from the U.S. web site. The specs on the Garrett turbo are from John a Limit Engineering.

As you can see the turbos the same on the compressor side except for the size of the inlet. On the turbine side the Garrett has a smaller wheel a different trim and a tighter A/R. From what John at Limit told me. The Garrett 2871R should spool up a bit faster than the and stop making power at about 7500 rpm. For my application I am going to try the Garrett 2871R. I will post how the turbo performs. In the end the right turbo is the one that best suits your goals.