What size Turbo are you running.

WyoBoy1000 · Aug 14, 2011

Summer talk.

There has been a lot of talk on turbo size but not really a thread that specifically asks. Who has what?

It seems many have been running a 2860 on the 800cc and a 3071 on the 1000. It is becoming more evident the 2876 with a .86 A/R has better response and builds more power at lower boost levels. Same with the 3076 (not sure on the A/R) on the 1000. Although it is still unclear to me if this is what everyone is using and what A/R they are going with. What works and doesn't work.

Here are the threads that talk about it the most in the ac section.

http://www.snowestonline.com/forum/showthread.php?t=272403
http://www.snowestonline.com/forum/showthread.php?t=271811

I'm pretty sure Twisted is only using the bigger turbos now and I haven't heard of anyone else. OVS is using a hybrid 2871, still not 100% sure what pieces they are using.

What are you running and who's kit? For those that are running the bigger 2871, 2876 and 3076 what housings, wheels, sizes, etc.... are you using?

ghost rider · Aug 14, 2011

Turbo

Why don't you just call shain up and get the 2876 already! You know you want to.

mynewuseddoo · Aug 14, 2011

I'm guessing the "hybrid" uses the 3071 comp housing which is bigger at .70 A/R as compared to .60 on the 2871, if I'm not mistaken.

I'm very interested in the 2876 as well Wyo. I run the gt2860rs in my CPC set up and my response is fantastic from out of the hole and on off throttle in the trees. I am still having a hard time believing that the larger 2876 is going to have the same crisp response as my system has now. I have ridden a Twisted M8 with a 2871 and it definitely didn't have the snap of my set up, mind you it did out climb me on the top end. The low end snap can also be attributed to my CPC clutching as compared to Twisted's clutching also, so I feel like I'm kinda comparing apples to oranges between these two sleds. He was also running straight AV at 10 PSI and I was running 50/50 AV/premium at 10 PSI and this is also a factor on the low end as well.

When it comes down to it, I suppose I could always sell the 2876 if I don't like it. The idea of running less boost to achieve the same power is nice, and lower charge temps are a plus also. But I know I will leave my boost at 10 PSI and just welcome the extra power! I'm pulling about 55MPH in a deep powder climb so it will be interesting to see what kind of top end climbing track speed the 2876 will provide as compared to my 2860rs.

Another thing is, what is a persons definition of great low end response? And is the new and better response which the 2876 is proving from their old set up's as good the current set up I am running now? It's all relative in respect to what they felt before.

I don't know, decisions decisions.....

Anyone running a 2876 on a CPC stage 2 or 3 M8 set up?

smoking_powerstroke · Aug 14, 2011

Anyone have experience with a 2868?? I just bought a 2010 with a push that is running one.

knifedge · Aug 14, 2011

--Shain and OVS say with their repective setups, the response and power off the bottom is as good or better than a M1000(when clutched and tuned properly). Who could go wrong with that?

--Most anything with a Tial external wastegate will have improved response, build boost quicker, and get more HP per pound of boost over an internal wastegate.

-- 2876 compressor uses 70 a/r housing, 76mm diam comp. wheel, and 48 trim, 4" inlet, 2.5 inch outlet

http://www.atpturbo.com/mm5/merchan...tp&Product_Code=GRT-TBO-003&Category_Code=GRT

--2871 compressor uses 60 a/r housing, 71mm diam wheel, and 52 trim, 2 inch outlet

http://www.atpturbo.com/mm5/merchan...tp&Product_Code=GRT-TBO-022&Category_Code=GRT

--2871 Hybrid compressor uses 70 a/r housing, 71mm diam wheel, and 56 trim, 4 inch inlet, 2.5" outlet

http://www.atpturbo.com/mm5/merchan...tp&Product_Code=GRT-TBO-022&Category_Code=GRT It is only around $1400 with the larger T04s housing and a stainless turbine housing

http://www.atpturbo.com/mm5/merchan...tp&Product_Code=ATP-HSG-053&Category_Code=GCH

http://www.atpturbo.com/mm5/merchan...uct_Code=GRT-CWH-002&Category_Code=COMPWHEELS

--There seem to be other Hybrid combos available using a 3071 comp housing with a 60 a/r. Always use a 82 a/r or bigger turbine housing with the 28 series per gus bon.

--So judging between a 2871 Hybrid and a 2876, they both seem to have the same 70 a/r, 4 inch inlet, and 2.5 inch outlet. This would indicate to me that they both have similar flow rates despite different size compressor wheels. So the question is, does the smaller diameter 71mm compressor wheel spool faster and build boost quicker than the larger 76mm comp wheel? Not sure what the difference in mass of the two wheels are despite the different trims of 48 trim for the 2876 and 56 trim for the Hybrid 2871. If mass is equal, then the smaller diameter wheel would spin quicker, however, if the smaller 56 trim flows more air than the larger 48 trim then maybe it is a wash.

--OVS uses a 2871 Hybrid(not sure exactly what components) and has a Tial external wastegate option

--Twisted uses the 2876 with a standard internal wastegate

--This is just my own research, verify components for yourself--

mynewuseddoo · Aug 14, 2011

I found this comparison photo of a before and after showing the 2860rs and the HTA 2868 billet wheel and housing upgrade. And here is the link where I found it. Looks pretty impressive.

http://www.audizine.com/forum/showthread.php/298206-My-new-compressor-wheel-(TiAL-2868-Turbo)

WyoBoy1000 · Aug 14, 2011

I am still waiting for my demo ride on a new cat before I go buying a turbo kit, or bigger turbo for the current sled. Mine works pretty good as it is but compared to a piped 1000 and pg 1000 its no where close, I still have a hard time seeing that kind of pull out of a M8. I just brought it up for some more chatter. Some of you commented but didn't state what you where running. When I decide what to run I'll just call Twisted and tell them to send me what he recommends. Still kinda curious about the m1100T.

smoking_powerstroke · Aug 15, 2011

WyoBoy1000 said:
I am still waiting for my demo ride on a new cat before I go buying a turbo kit, or bigger turbo for the current sled. Mine works pretty good as it is but compared to a piped 1000 and pg 1000 its no where close, I still have a hard time seeing that kind of pull out of a M8. I just brought it up for some more chatter. Some of you commented but didn't state what you where running. When I decide what to run I'll just call Twisted and tell them to send me what he recommends. Still kinda curious about the m1100T.

Wyo you are saying your tm800 won't beat a piped m1000??

gus bohne · Aug 15, 2011

What we seem to not be gettin across is the amount of airflow thru the compressor housing when the turbo is NOT spinning, or not spinning at an rpm at witch positive pressure is produced.

these hybrids and the larger a/r comp housings flow more or ( leak More) around the wheel and dont cause the dreaded bog ( starve for airflow ) While waiting for wheel rpm to climb.

I dont care who tells you what,, you cant drive the turbo without AIRflow thru the engine, smaller just does not work here...to see that happen the exhaust side would be so small as to make rpm at idle that the working backpressure in the field would be un useable.

this is why the vatn looses to the fixed scroll.. when the vacum side pulls the vanes open the turbine rpm is lost..
so we lock the vacum side to eliminate that,, NOW we have a poor flowing weak driving hot side.. Not so good..that chirps on decell and is hard on itself and our wallets.

offer is open here too.
going to DTR in early sept. send me your little turbo and we will prove it on the pump.. """" you villlooooose !!

LOL
Gustapo

mynewuseddoo · Aug 15, 2011

gus bohne said:
these hybrids and the larger a/r comp housings flow more or ( leak More) around the wheel and dont cause the dreaded bog ( starve for airflow ) While waiting for wheel rpm to climb.

Which preserves the lowed and out of the hole throttle response that I like in my gt2860rs, correct?

Apparently this 2868 "hybrid" is supposed to flow 48 lbs/min. Any thoughts Gus? or anyone else?

I'm still learnin.....

mynewuseddoo · Aug 15, 2011

Called Forced Performance about the GT2860RS to HTA2868 upgrade, $600. If you are buying the 2860 new from them and want it done, $1699.

I will wait to hear more from the experts on this but $600 to get more out of my top end ain't too bad.

WyoBoy1000 · Aug 15, 2011

smoking_powerstroke said:
Wyo you are saying your tm800 won't beat a piped m1000??

It will but the m1000 has a little more instant throttle response

WyoBoy1000 · Aug 15, 2011

I was told a 2876 will pull harder out of the whole than a m1000 and all the way up, (that is on a twisted kit) Also that a 2011 m8 with a 2876 setup right will pull with a Tm1000 up to 10lbs.

Someone please pull your 2860 and send it to gus, he will be comparing against many other turbo sizes.

Tonysnoo · Aug 15, 2011

Since we are talking cat here and predominately TM8s, I want to remind folks that what works well on 09 and earlier, may not be exactly the same with 10 on up......and vise versa.

Also for bottom end response: the model year of the pipe and the way it was "cut and welded" to the turbo connection makes a pretty remarkable difference on response, no matter what big turbo. :face-icon-small-hap

gus bohne · Aug 15, 2011

the larger exducer on the comp wheel is producing higher TIP speeds ( diameter ) at the same shaft rpm.. thats good and where we see the gains at low rpms.

Though these hybrids are very good, till We can test one in the field the 2876 is getting the nodd from me for the 800's

the 3076 is barely addequate of 1 liter and up..My favorite is the 3082 or a hybrid 3076....those rock the house HARD !!!!

First thing I noticed when swapping to the 3582 from the 3076 was LAUNCH pull.. no comparison..NONE..bigger is better..

be cool

Gus

WyoBoy1000 · Aug 15, 2011

So everyone is saying the 2876 just because it has been used and tested, but bigger may be better just need to put it to use in the real world.

What size engine where you using the 3582 on.

Tonysnoo · Aug 15, 2011

WyoBoy1000 said:
What size engine where you using the 3582 on.

I think he was talking about his 1 liter (1000cc) drag sled that he has been working on over the last few seasons.

gus bohne · Aug 15, 2011

on the 1000 and on the triple triples to 550 hp.

over that hp I use the 3788..or 4094.

quad had a 4204..thats a 102 mm compr wheel ! we loaded it @ 3300 rpm on the cement dyno and it was incredible to see boost that low with that much compressor pull up clean no pops farts or sneezes...

all my tests start at 4000 rpm no higher..most only sweep a 2000 rpm range to stay out of deto ...ie. 6700 to 8700 window for load..

4000-8700 is a long time @ 500 per second...9 second at full song ...:boxing::boxing:

my fear wyoboy is that any larger on the comp would need a larger turbine to drive it.. then we might get to a pinch point.
the teeter totter is,, 2876 or 3076..in my opinion,,,the 76 is a must for the 800 900 crowd. the 82 is the minimum for the 1 liter and up crowd.

but thats just my feelings..

anyone want to hire me out there for a few months of testing these ?? Im always open to new ideas and of course.. learning to ride on snow rather than flat ***** ice!!! LOL

Vertical-Extreme · Aug 15, 2011

Tonysnoo said:
Since we are talking cat here and predominately TM8s, I want to remind folks that what works well on 09 and earlier, may not be exactly the same with 10 on up......and vise versa.

Also for bottom end response: the model year of the pipe and the way it was "cut and welded" to the turbo connection makes a pretty remarkable difference on response, no matter what big turbo. :face-icon-small-hap

With this being said, has anyone tried a 2876 or a hybrid 2871 on an 07 M8, my sled in an 07 but the original turbo was bought fro OVS in 08, and I don't think they were using the hybrid 2871 then...

knifedge · Aug 15, 2011

--This is the first season for OVS to offer the 2871 Hybrid. I think Twisted just started offering the 2876 last season(not sure though).

--800cc is 800cc and needs the high flow turbo regardless of year. Tune the sled to work with the turbo.

--Anyone with an existing 2871 can convert to a 2871 Hybrid for around $500.

--If ultimate throttle response is desired(among other positive characteristics), get Tial conversion kit from OVS

What size Turbo are you running.

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