Upgrade form gt28RS to GT2871R?

[Wheel House Motorsports]

the 28 is the exhaust housing dimension, they are all 28 series and im betting all of them have the same .86 ar as well, meaning they all have the identical exhaust side on the turbo. the difference is the compressor side. the 60, 71 and 76 are the compressor wheel size. obviously, bigger = more flow. and more flow at lower wheel speeds. the 2871-2 is just a designation for one of the various housing versions garrett has, there are a bunch depending on if the wastegate is included and the types of flanges used as well.

 

[Eli]

The 2876 has a .70 AR compressor housing and a 2.5" compressor outlet compared to the .60 AR compressor housing and 2" compressor outlet of the 2860/2871.

Also, the compressor has a 4" inlet.

Exact same on turbine side.

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[ForceFed]

Gus or Shane, has either of you tried a gtx3076r with a .63a/r ex or something similar on an 800? If so what were the results?

 

[Wheel House Motorsports]

i know the 3071 with the .64 exhaust has better bottom and way more top then a 2871 w/ the .86 housing, so im betting it would run insanely well.

 

[WyoBoy1000]

i know the 3071 with the .64 exhaust has better bottom and way more top then a 2871 w/ the .86 housing, so im betting it would run insanely well.[/QUOTE

In English please, are you talking about a 3076 on a 800

 

[KMOD]

hta

Gus

I run a 3082HTA in my 1200 this year and it makes more power than the 3076 HTA, but its a little laggy.
Power brake it and she spools right up quick, for a drag race it fine but just to ride its a little laggy.
Its a .82 ar on the exhaust, do you think that a .64 would make to much heat?


BTW
We are planing a ride at Smiths Fork WY. on the 4th of July, last week there was 9' on the snow gage up there and there was only 10' in March.
Been cool here and the snow up high is holding good.
Kevin

 

[Eli]

Kevin, were both of the 1200 turbos the same ratio on the turbine side?


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[knifedge]

---So basically for 8000-12000 ft altitude and 225-250 HP+ range and excellent drivability

Use a 2876 for 2 stroke under 1 liter-- M800

Use a 2871 or maybe a 3071 or 3076 for the 4 stroke 1100T running around 8000 rpm

Correct?

 

[gus bohne]

Gus

I run a 3082HTA in my 1200 this year and it makes more power than the 3076 HTA, but its a little laggy.
Power brake it and she spools right up quick, for a drag race it fine but just to ride its a little laggy.
Its a .82 ar on the exhaust, do you think that a .64 would make to much heat?


BTW
We are planing a ride at Smiths Fork WY. on the 4th of July, last week there was 9' on the snow gage up there and there was only 10' in March.
Been cool here and the snow up high is holding good.
Kevin

Kev man.

the .64 is soooo much snappier and flows just fine..

for 800 cc twins with turbo specific port time,, go with a at least a 76 compressor and for under 20 psi a .64 housing is even better ( 9000 feet and up ).

for the big guns 1 liter and up start with a 82 compressor.

When I get back to sled stuff in late July after the lorreta lynss ameture nationals..( mx ) I will be testing 3582, 3082, 3788...64 all on hot side.

remember wheel diameter has a much larger effect on response than we thought.. tighter a/r with a larger wheel is more efficient at accelerating the wheel and still flows all youd ever need.
I used to be of the mindset that a 28 was sufficient,, Now I see the tighter 30 is just that much better again..


When I launched the RT 995 doo @4500rpm with the 3582 on it the pull blew me away.. and instantly shot to 42 psi..fuug alll.....that was serious. Now the 3788 may blow that away again !!!!

goals are always lofty ,,,

 

[Dogmeat]

Looking through this, it appears to me that it would be a direct swap between a 2876 and a 2860? You'd basically be bolting up a new center section and compressor housing, but the outside dimensions on the compressor housings would be roughly the same as that of a 2860?

Reason being, I'm trying to figure out how to get more low end response of of that BD kit I put on, and it had been mentioned to go to a 2876 turbo ... If I don't have to replace the whole kit, its something I'd consider doing.

 

[KMOD]

Kev man.

the .64 is soooo much snappier and flows just fine..

for 800 cc twins with turbo specific port time,, go with a at least a 76 compressor and for under 20 psi a .64 housing is even better ( 9000 feet and up ).

for the big guns 1 liter and up start with a 82 compressor.

When I get back to sled stuff in late July after the lorreta lynss ameture nationals..( mx ) I will be testing 3582, 3082, 3788...64 all on hot side.

remember wheel diameter has a much larger effect on response than we thought.. tighter a/r with a larger wheel is more efficient at accelerating the wheel and still flows all youd ever need.
I used to be of the mindset that a 28 was sufficient,, Now I see the tighter 30 is just that much better again..


When I launched the RT 995 doo @4500rpm with the 3582 on it the pull blew me away.. and instantly shot to 42 psi..fuug alll.....that was serious. Now the 3788 may blow that away again !!!!

goals are always lofty ,,,

Right on Gus
More turbine housings on the way, its only money.
If the 12 was snappy on the bottom, holy s--t, it would be a blast to ride all the time. Pop around in the trees and then let it out on the long hills.
Keep us posted in July on what you learn.
As always your the man GUS!!!!!!
Thanks for sharing all the expensive hard earned knowledge.

Eli
The turbine wheel was the same they just upgraded the blow side.
The 3076 hta was laggy also.

Thanks, Kevin

 

[WyoBoy1000]

Dogmeat,
I'm pretty sure its a direct swap but your fueling will need to be changed, If BD has started using the 2876 they might have a base line but from my experience BD has not been very good with there first year changes. (I'm tired of Bd's constant updates (to make it work right), unlike everyone else that use upgrades (to make it better). But you may be able to swap with ease and everything work great, I would start calling the kit builders and get some info.

 

[Dogmeat]

Dogmeat,
I'm pretty sure its a direct swap but your fueling will need to be changed, If BD has started using the 2876 they might have a base line but from my experience BD has not been very good with there first year changes. (I'm tired of Bd's constant updates (to make it work right), unlike everyone else that use upgrades (to make it better). But you may be able to swap with ease and everything work great, I would start calling the kit builders and get some info.

I have the additional injectors, and I'm pretty comfortable with the settings on the box, I'm pretty sure I could do the tuning on it myself. I'd just be mainly concerned about dimensions as well as whether or not a 2876 was the right turbo for 12 psi. I would not plan on running more than that with this.

 

[knifedge]

--From reading above, it sounds like the 2876 is the right turbo giving M1000 like torque off the bottom thru the top end. Sounds like 12 psi is a piece of cake for the higher output compressor, especially compared to a 2860. Kmod says he has no problem making 16-18 lbs at 10,000 ft. Product Tester sells them as standard equipment in his Twisted kits.

-According to above info: 2876 compressor has 4 inch inlet and 2.5 inch outlet

 

[Eli]

The compressor housing on the 2876 is physical larger with a little longer snout. Also, the discharge centerline of the compressor is about 1"closer to the turbine. I went from a 2860 to a 2876 and ended up with almost the same exact box settings. Hope this helps.


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