GT2871R .86 Users Unite

[S14Redtop]

Post deleted by S14Redtop

[Your_Mom]

nice, hope to get there someday.

[97silviarb]

Have yet to dyno my setup since I just got the Enthalpy ECU and he is still working out a few bugs in the program

Redtop
GT2871R IW
Tomei 256/11.5 cams
Megan Bottom Mount
Greddy Profec B type S
26 x6.5 x3.5 No name FMIC
Top Feed Rail
50# Injectors
3'Full turbo back exhaust
Stock IM
Walbro 255
Z32 MAF
Enthalpy Tune

Not planning on going crazy with the boost. The car feels really nice now running 16psi on the street.

[scotheocelot]

Angel,

Yeah i remember your Supra there at the Texas Supra Meet. I felt bad that you came all that way and had the problems you encountered. Anyways did you ever post your setup on the forum? That is an awesome 1/4 mile time for your setup. Im interested to see what you have done cuz i am indecisive about the GT2871R i will use. Thanks!

-scott

[Angel]

Angel,

Yeah i remember your Supra there at the Texas Supra Meet. I felt bad that you came all that way and had the problems you encountered. Anyways did you ever post your setup on the forum? That is an awesome 1/4 mile time for your setup. Im interested to see what you have done cuz i am indecisive about the GT2871R i will use. Thanks!

-scott

Haha, I still had fun though... maybe you'll remeber why

My "setup" is nothing really, aside from the normal fmic, exhuast and whatnot I have the 2871 .64, dw 650cc injectors, enthalpy ecu, JWT S3 cams, and an upgraded actuator from my company. Aside from that it just seems to run really well for what it has. This car should do much better if I ever get it out there again, hell if nothing else the car was down 30 hp on where it sits now when it ran 11.5

[forcefedS13]

.64 rocks.

[JetBlackSkye]

S14Redtop, nice setup, I hope to get number like that soon.

S13 Redtop
GT2871R .86
3inch megan racing turbo back exhaust
Power XS exhaust manifold
Greddy Front Mount
HKS SSQ BOV
Tomei 740CC injectors
Z32 Maf
Greddy E-Manage (sorry guys, already bought it)
Cometic HG 1.1mm
Walboro 255LPH fuel pump
Aeromotive FPR
Greddy ProfecB boost controller

I havent decided on what cams to run yet, I'm thinking about doing 264 intake and 272 exhaust, with some adjustable cam gears. What do you guys think?

I'll be running about 20psi on 93 octane. This should be done in the next few weeks, IM SO EXCITED!!! AAHHH!!! CAN'T WAIT!

[scotheocelot]

[quote]

My "setup" is nothing really, aside from the normal fmic, exhuast and whatnot I have the 2871 .64, dw 650cc injectors, enthalpy ecu, JWT S3 cams, and an upgraded actuator from my company. Aside from that it just seems to run really well for what it has. This car should do much better if I ever get it out there again, hell if nothing else the car was down 30 hp on where it sits now when it ran 11.5

Your company? Are these internal wastegates available for purchase?

-scott

[Angel]

[quote]

Your company? Are these internal wastegates available for purchase?

-scott

Should have said the company I work for.... check pm's.

[Steeles]

woot just got my Gt2871r. and can't wait to get it on. unfortunately I've gotta assemble a few more parts. I bought it used and didn't get the wastegate actuator or the bracket for it (bottom mount style T25 flanged .86a/r). also didn't come with the oil outlet flange. I've browsed ATP's site (briefly) and after searching here on the install I need the T28 style wastegate bracket and actuator (by by HKS ) and oil drain correct?

I've already got Taka SS lines on the car now.

Thanks guys i'll get numbers up soon as I get it on!

[Kjetil]

A friend of mine got his 2871 .86 @ 352 RWHP on stock bottom end and stock cams. SSA Manifold and 720cc Nismo.

Thats pump gas, but we got 98 pump gas here in norway. never seen lower than 95 on pumps.. hehe

[Alpha]

Friend's dyno sheet. Boost was low due to not being tuned and injectors not in yet. Good baseline.

Car: S13 Hatch

Engine: Stock bottom end, stock head

Mods: Precision GT2871R, NGK 7EIX plugs, Greddy front mount, TiAL 35mm external wastegate, 3" open downpipe, Blitz SBC i-D, Koyo radiator, Walbro 255lph

8psi on 93 octane pump gas; Mustang Dyno unloaded:

[KB240SR]

Sorry to bring this back but i wanted to know if the guys who posted here about getting dynoed ever did? I dynoed mine and made 354whp but the clutch was slipping pretty bad. Boost was at 14psi, 16psi, and 19psi. You can see that 14psi held torque decent till higher rpm which the clutch then let go. Just got worse the 16psi and 19psi runs. I love how the power keeps climbing past 7500rpm.



Clutch is replaced now but itll be a while before i dyno again.

[Ichiyonsilvia]

Click here for My car and mods list.

Here is my .86 dyno at 19psi.
S14 SR with Power FC, tuned it my self.
I also did 404whp at 22psi with 100 octane.

[midnightgst]

What the spool differance between the 64 an the 86 also what are you guys spooling at with the 86?

[KB240SR]

Its about 500 rpm difference and 25whp 25tq. 14psi around 4250rpm, 16psi around 4350rpm, 19psi around 4500rpm.

[kove]

i have a .64 i want to trade for the .86 if any one wants..or ill buy a .86 if any one has one..

[KB240SR]

You can just swap the turbine housing to .86 instead. costs $250 from ATPturbo.com.

[nickalltogether]

just bumping this thread up... I just bought the .86 and I can't wait to get it on there. My setup as of getting it will be Greddy Intake Manifold, Vibrant Bottom Mount, and Stock Valvetrain (for about a month or two until I get HKS 264 Step 2's) My question is about how much hp will I be pushing at around 12 psi? That's all I plan on running for now and I'm just hoping my Exedy Stage II can hold it for a few months until I can afford a new clutch.

[KB240SR]

My 12psi is around 275whp but thats with BC 264 Cams and Greddy Manifold. Heres my new dyno @ 15-16psi.

[bigburt187]

I made right at 400whp at 21psi with a conservative tune on it and a big boost leak on a .86 with S4 cams, haltech, meagn manifold, greddy int mani, and nismo 740s. I'm pretty sure i could 430ish at 24psi with a more aggressive tune. I had a .64 and loved its quick spool, but its not gonna get me to 430....no way in hell. BTW im on stock HG and internals as well.....never even pulled the head off since I swapped it 3 1/2 yrs ago.

[KB240SR]

You have a graph?

[Martin XAT]

Funny this got posted up. I have 2 2871 cars at the shop this week. Some service work and both for dyno tuning. Both are .86.. Both are solid lifter high rpm setups with identical cams and ext wastegates. One is a 14 SR and one is a 13 SR.. The 13SR is just a pump gas tune to 19psi. The 14SR is a 19 psi pump gas first / run it out of efficiency race gas tune second. I will have some dyno charts for you guys by the end of the week !!

Martin
XAT Racing

[KB240SR]

Awesome. Cant wait to see the comparison of S13 and S14 SR with the same turbo.

[Martin XAT]

OMG... I have to throw a twist into this... We were doing the 14 motor on the 2871 .86 earlier tonight and I forgot to mention that he was running a 264 s2 NVCS cam.... this powerband is absolutely sick. Boost comes on very quickly at 3500 rpms. By 3650 we are above 250tq.. This is like running a .63 down low.. but a .86 up high... We are 351rwhp right now at 1 bar. More to come.. with charts by weekend.

Martin
XAT Racing

[KB240SR]

Post that graph up. Seems like majority of us are around 350whp @ 14-16psi. Pretty decent i soppose. The timing on my pull was only at 10* instead of 15* so there was definitly more to be had with mine. This turbo is pretty impressive with the right setup.

[johngass]

i just ordered my 2871 .86 from hybrid tonight. quick question, with the taka oil and water lines that i ordered also, do i need to buy the oil restricter?

[cwdmark]

the .86 has very shitty spool compared to the .64. response is about the same in both with quite a bit more power hitting on the .86. but i suggest not going .86 because the lag is horrendous. go t3 or go .64. a t3 is going to spool a lot faster than an .86.... a LOT faster. having a .86 on a t2 is like throwing a t3t4 57 on a full race manifold (which was my setup). its a waste of a gt turbo. same goes for ANY gt turbo bigger than a 2871 .64 on a t2 flange. you're combating a big lack of spool for power, just to stay with a t2 flange. you're much better off going t3/topmount and throwing on a t3t4 50 trim. itll spool faster and make more power, not to mention flow more evenly and be a more efficient setup.

i actually have an exact overlay of a modded (s14redtop's) gt2871 .86 and a t3t4 57 with just about exact same mods. my t3t4 spooled up slightly faster and made 10whp more. and the 57 is the least efficient turbo of the t3's, a 60 trim would have made a great deal more power and spooled faster yet.

[nickalltogether]

thanks for coming into a thread and putting down the thing that every poster in the thread has in common... smart.

[KB240SR]

I think the biggest problem with spool/boost response on the .86 turbo is the Exhaust Manifold everyone is using. When i went from Megan back to Stock, i regained the midrange boost that i had been needing without much sacrifice up top in power. Im hitting 20psi around 4500rpm now. Id like to see a dyno with a Full Race, Tomei, or Silk Road Manifold. It used to lag around 4krpm with the Megan but now it just takes right off.

[cwdmark]

Originally Posted by KB240SR

I think the biggest problem with spool/boost response on the .86 turbo is the Exhaust Manifold everyone is using. When i went from Megan back to Stock, i regained the midrange boost that i had been needing without much sacrifice up top in power. Im hitting 20psi around 4500rpm now. Id like to see a dyno with a Full Race, Tomei, or Silk Road Manifold. It used to lag around 4krpm with the Megan but now it just takes right off.

thats exactly what i was talking about. full boost at 4.5k, especially for a gt turbo, is very unimpressive. i had the exact same spool on a t3t4 57 trim that cost $500 and was deisgned in the 70's or 80's. a ballbearing turbo with those specs should spool at or before 4k.

its almost all due to the t2 vs. t3 flange. the higher flow specs of the t3 flange vastly aid in spool.

Originally Posted by nickalltogether

thanks for coming into a thread and putting down the thing that every poster in the thread has in common... smart.

i dont think every poster ran all three turbos and has dyno overlays of all three. i was posting in response to martin xat's post... i have an EXACT dyno of the setup he is talking about, and fool boost isn't at 3500. it's at 4.5-4.6k. when he posts his dyno up you will see that tq will peak right in that area.

[cwdmark]

fyi: im not poking at people's setups, im poking at the turbo setup on the given application. there IS a time and place to run the .86 trim.......... when you want the same power as a t3/t4 setup but dont want to change out manifolds/setups. putting that gt t2 turbo on will yield almost the EXACT same results of a t3/t4 swap.

[KB240SR]

I agree with the T2 Housing being restrictive for spool. Id love to see a dyno of a GT2871R .63 (T3) to compare to a .86 (T2).

[Martin XAT]

Sorry for the no response in a couple of days. I dumped my whole dyno directory off the dyno pc onto my thumb drive and have them here on my home pc. I do have to apologize though and remove my foot from my mouth... cwdmark was 100% right about the spool chars of this turbo. When I was tuning this car.. the owner... one of the techs at the shop pulled up another chart of one of my old setups with a much different turbo.. a HKS 2530 ex wg. I did not realize this till I just looked at the charts from that day.. and all this time I thought we had hit on a good combo with the NVCS cam and all.... I am convinced now that there is nothing but a little spray that will help these things out down low... The charts here are from a 14 and a 15 psi pull... Notice something funny though at 6K ? He used a piece of coupler that was about 6 " in length on the inake side and it would start sucking shut.. He was dynoing again tonight as I was leaving the shop and got past 405 rwhp. I will reupdate with his new charts tuesday or wed when I get into work.. without that funny slope past 6K.. haha.. Again.. sorry for the giddy excitement on my previous post... I've been doing this for a long time and should know better than to expect to beat the laws of physics and volumetric efficiencies of a motor

Martin
XAT Racing

[KB240SR]

Yea i can see if he gets that 310tq to hold to 7500rpm then hes gonna be over 410whp.

[Martin XAT]

310tq @ 7500rpm
---------------- = 442 rwhp..
5252


that is if it flows out that far... I ported a s14 sr cast manifold and drilled straight through the divider wall in the manifold below the wastegate hole I made... should help this have as little backpressure as possible...

Martin
XAT Racing

[KB240SR]

Itll probably drop to around 290-300tq around 7k-7500rpm.

[cwdmark]

Originally Posted by Martin XAT

310tq @ 7500rpm
---------------- = 442 rwhp..
5252


that is if it flows out that far... I ported a s14 sr cast manifold and drilled straight through the divider wall in the manifold below the wastegate hole I made... should help this have as little backpressure as possible...

Martin
XAT Racing

the way you were talking i thought maybe you had a couple freak motors i think you are very close on your estimate. you might be able to hit that power level if you can get that much air to the turbo. my friend hit 428whp (uncorrected) and 438whp (corrected). i believe enthalpy said you always take uncorrected values for a boosted application.


good luck. race fuel and lots of boost

[hwmpunk]

These are some graphs of my buddy SR20Life from tallyimports.com w/ .86


These runs were on stock fuel, maf, tune, plus BC 264 and apexi WG:










1st run was off the waste gate which was 8psi--250hp 197ft lbs
2nd run was on a manual bc at 8psi 267hp and 211ft lbs
3rd run was 11psi 291hp ??tq.
last run was 13psi and 325hp and 270ft lbs

Boost feels real nice w/ the WG. Yes he's running too much duty on the injectors but this was only for dyno purposes, turbo stays at 8-9psi.
BTW just for reference, we ran he was just off wastegate @ 8spi and me on t25 @ 15psi, we were about even. I'd pull a car until 4th, then he'd start pulling me back.
New dynos after injectors and enthalpy tune later...

[gatecrasher]

never got around to putting mine on the dyno, but heres a video a friend of mine put together from some runs one night. 2871+50 shot+ 93 octane. the run with the TT viper sucks on video because he just turned back into the parking lot after i put about 3 cars on him out of the hole.

http://videos.streetfire.net/search/...5d0184856a.htm


...and yes i know he misspelled nitrous