GT2871 USERS. SR motor

[slider2828]

Nah just take your time... I gotta rework some stuff.... I am low on funds, so its going to take some time, hopefully steve will hook us up.

[deukalionS14]

cool. sounds good! im going to do those upgrades and clean up somethings so ill be a while too hahaha

[Teambadrun]

haha steve.. is there anyway you can tune my car in australia?? my 2.2L stroker??

a friend of mine had his lambo tuned over the phone or something.. the ecu had this special sensor and the tuner was able to do it from interstate LOL!!

maybe something like that ? haha i wish
anyway would you ever come to melbourne?
let me know

[deukalionS14]

man so no one talks about their 2871r anymore? no more new info to share? or did everyone move up to a top mount set up?!!

[slider2828]

Its all been said in the thread LOL!!!

I mean there is even a special Tial housing for the GT2871R on ATPTurbo, but other than that, there is nothing new.

[usdm180sx]

Originally Posted by slider2828

I mean there is even a special Tial housing for the GT2871R on ATPTurbo, but other than that, there is nothing new.

Yeah I'm really interested in how stable that setup would be.

[slider2828]

What do you mean by stable? Its basically attaching an external wastegate to the housing?

[VQMaxFan]

dang still no posts of a GTRS dyno?

Mebey ill be the first next month.

[D1S13]

Originally Posted by Jordn

Dunno if this'll help anyone or if I'm justing whoring it out but heres my spec and graph from GT2871R .64 on a non VVTi SR20 Redtop. IIRC this was at 1.3 bar [19psi] on a Dyno Dynamics machine [I think these are more conservative than others!] running 97 octane.



The Spec

Engine
Rebuilt SR20DET
Apex-i headgasket
Apex-i mild duration cams [we think, we aren't THAT sure]
Greddy FMIC and Greddy Hardpipe kit
Tomei Power Extreme Tubular Manifold heat-wrapped
ARC Larger Winged and Baffled Sump
Z32 AFM
Apex-i Power FC and commander
Apex-i T28 Inlet Elbow
Apex-i Hard intake pipe
Apex-i Super Suction Intake
Garrett GT2871R Turbo with 0.64 housing built by Turbo Dynamics
Turbo Dynamics Adjustable actuator
Greddy Intake manifold
555cc injectors
Iridium 8 plugs
Stainless turbo elbow
Down pipe
Decat
Kakimoto cat back exhaust

Hope that serves as a decent comparison.

my set up is very similar and my dyno was bout the same, but mine was 330 w/out dialed in tune...just enough to keep it running... could have made more power for sure. now replacing it with a top mount 3071. I will always love the smooth power band of the 2871 more!

[deukalionS14]

Originally Posted by slider2828

Its all been said in the thread LOL!!!

I mean there is even a special Tial housing for the GT2871R on ATPTurbo, but other than that, there is nothing new.

this is news to me! now im going to look this up hahaha

[usdm180sx]

Originally Posted by VQMaxFan

dang still no posts of a GTRS dyno?

Mebey ill be the first next month.

HKS GT-RS with HKS 256/264 step 1 cams, 86.5 CP pistons, eagle rods, tuned on HKS FCON VPro @ 1.15 bar. Turbo started spiking after that.

[juggernaut1]

Couple of pics of the Tial housing for you:



throat of the ex housing



custom ex mani



dummied up

[slider2828]

USDM, that is on a dynojet I believe..... D1 was yours dyno'ed on a dynodynamics or dynojet

[JacksonBrown]

I've been toying with the idea of doing a twin scroll manifold with my 2871. This will require changing the housing, correct? Obviously purchasing a couple of Tial WG's as well..

It's obviously fairly common/popular to rock a twin scroll on the 3071's as spool/response is increased.

Questions:
1. What are people's thoughts about doing a twin scroll w/ a 2871 and "upgrading" housing to accommodate 2 wastegates?

2. Have any bottom mount/internally gated 2871 users reading this thread done this? If so, is it worth the $ to do this and how much earlier does the turbo fully come on line? (full boost)

3. Is it worthwhile to "modify" a 2871 internally gated turbo, or would it be easier/better to buy one (if possible) that already is externally gated?

Hey, at least I'm keeping the thread alive and interesting...

[slider2828]

Changing the housing? Twin scroll is twin scroll housing and twin scroll manifold. I don't even know anyone who makes it, so pretty shit out of luck there.

2871R's don't boost that high to accomodate 2 wastegates, no reason to. An HKS internal or a single Tial V44 or v38 is good enough. It doesn't push that much psi.

I have been toying with the idea, but I run track and a stock exhaust manifold. I can't have that POS tubing break on me at the track so cast is the best. Weld to a cast is not easy to do it the "right way" so I am going to opt for the housing when I have money, but I think it would come on quicker and definitely hold better.

Like I said before 2871Rs unless you boosting over 18psi you don't need to get an external wastegate, but if you do, get the special ATPturbo housing that has the wastegate build in....

Yeah 2871R's are sorta played out.... + economy is not doing so great, so not much people upgrading or dynoing... LOL

[deukalionS14]

i was wondering the same thing about USDM's graph..which one? but either way they are nice numbers!

thanks for the pics! its pretty! i would probably end up upgrading to a top mount 3071r/76 though...im just trying to get THE MOST out of this set up i move on.

Yeah 2871R's are sorta played out.... + economy is not doing so great, so not much people upgrading or dynoing... LOL

this is depressing. it came and it went hahaha and im still stuck on it!

has anyone thought of going to a Trust/Greddy turbo?

[usdm180sx]

I have to verify. The car was tuned at hks usa.

[slider2828]

Trust Greddy uses Garrett no doubt... Even HKS.... You gotta go IHI, but that is baller status!!

[djcobra]

I like usdm180's dyno graph, very similar to mine. Only difference is that i'm using a GT28RS turbo small trim, and Step 2 HKS cams (256in/264ex). The turbo is holding me back a little which yields to around ~330whp. I've been itchin' to switch my turbo to the GT2871r 64 trim, however just a little scared that i'll lose that quick respsone which i'm so used to. I'll Probably do the upgrade end of this year and post dyno results.

Steve.

[slider2828]

Hmmm moving mine up for comparison. I see a normal HP difference.... If not using a DD.

-ken

Originally Posted by slider2828

Got new numbers after Steve work his magic. Steve is hands down the best, any cars tuned, Ima send it his way.... I gotta say magic, cause the gains are disgustingly sick. A lt better than I thought..... Myfirst dyno was on the dynojet was on 93 with HKS264 Step1's and now Same setup same boostlevel at 16.5 (same as before) but with steve's tune and 91 gas.....

Its neck snapping fast geezus.... 200lbs of tq at 4000RPM

On a dyno dynamics, oh and still has a full cat with silencer stock IM and EXM.... I think that is enough or me.... Inspiration was Mine's 34 GTR, just focus on response....!

Geezus I also just notice 295 Lbs of Torque at 4800 RPM.... Get a neck brace time!

[deukalionS14]

^^ jesus...i LOVE your trq lol i wonder that feels like....

well i asked about the turbo's because they have the TD-06 20g which is a mitsu turbo and seems to be doing the evo guys pretty well and is used by some in Japan as well...i dont know..

i dont know what the gt28rs characteristics are but it cant be too far from the 2871r.64 could it? i like my turbo so far hehe

havent been able to "compete" against another car of the same power i have yet but on a solo level it puts a big smile on my face!

[slider2828]

Yeah I think GTRS is very comparable to the .64. Torque is crazy on my car... it blows most Porsches out of the window on tracks except Turbos and GT's.... It does better than a Charger and the Challenger on the track on exits, but the HP they catch up mid way uphill lol...

Yeah on the track I am pretty scared to bump to 18PSI, cause I REALLY feel the difference, it don't stop... Scared an instructor at Sears Point pretty bad.

TD-06 20g is REALLY good turbo easy to rebuild and great torque, but HP is not that great and I don't think the powerband is very linear.... Most still opt for the HKS2835 which is the 2871R .64 I believe....

[deukalionS14]

Originally Posted by slider2828

Yeah I think GTRS is very comparable to the .64. Torque is crazy on my car... it blows most Porsches out of the window on tracks except Turbos and GT's.... It does better than a Charger and the Challenger on the track on exits, but the HP they catch up mid way uphill lol...

Yeah on the track I am pretty scared to bump to 18PSI, cause I REALLY feel the difference, it don't stop... Scared an instructor at Sears Point pretty bad.

TD-06 20g is REALLY good turbo easy to rebuild and great torque, but HP is not that great and I don't think the powerband is very linear.... Most still opt for the HKS2835 which is the 2871R .64 I believe....

DAMN!! thats crazy! if i could do something like that i would be super proud haha. im still learning how to drive this car according to its power and characteristics.

it must feel nice to blow past cars that cost 4 to 6 times more than what ours are worth huh?!

but yeah my main thing is that i also wanted a turbo that can be rebuilt while giving me the power that i want with a good amount of trq..

[slider2828]

Its fun... until they start dogging you at the pumps when you get gas.... Best was keeping up with a z06 that was running 325's up back, but he wasn't a GREAT driver, but he's been at Laguna Seca a couple of times. Was always only running 14PSI hahaha... My car was tuned at 16.5PSI, but I think it was because of weather and elevation, that my car runs at 18 when I got back into San Francisco area. Probably air is much cooler here too.... Anways, I am going to repair my front bumper, and install a setrab oil cooler to the side, right now an RX7 FC oil cooler, but its hard to find a spot ofr something that big. O and my car is pretty balanced, but I can spin slicks out top of second ahahah just a little hahah.... (245 bfg r1's)

[deukalionS14]

Originally Posted by slider2828

Its fun... until they start dogging you at the pumps when you get gas.... Best was keeping up with a z06 that was running 325's up back, but he wasn't a GREAT driver, but he's been at Laguna Seca a couple of times. Was always only running 14PSI hahaha... My car was tuned at 16.5PSI, but I think it was because of weather and elevation, that my car runs at 18 when I got back into San Francisco area. Probably air is much cooler here too.... Anways, I am going to repair my front bumper, and install a setrab oil cooler to the side, right now an RX7 FC oil cooler, but its hard to find a spot ofr something that big. O and my car is pretty balanced, but I can spin slicks out top of second ahahah just a little hahah.... (245 bfg r1's)

hhaha dogging you?! they taunt people like THAT is NorCal?! damn....not where i live haha

to be able to keep up with a Z06 with our bottom mount set up is great news. i know we dont have the same power out put but that gives me hope!

sounds like you've got a major beast on your hands bro! i shall get on the "beast" leveel after these upgrades as well!!

[WDBDYSIL]

Originally Posted by JacksonBrown

What, in your opinion, is the turbo worthwhile then?
Stock manifold, stock motor, ~$1000 and it makes over 100whp over stock motor, not sacrificing low end power. Please tell us what turbo can accomplish all of this criteria if you have something objective to add to the thread.

There is NO other way to make this power for the price... I don't know why people have to hate so badly.. haha

[sbanzer123]

Originally Posted by sbanzer123

just got my car tuned saturday.
s14 sr20
apexi hg stock thickness
cp pistons 9:1 comp
2871r .64ar
tomei 740cc
greddy intake
megan exaust mani
megan elbow
jim wolf sc cams
p2m ras
aem ems
speed density



on a dynapack. im pretty happy with the numbers, and the car feels solid.

vqmaxfan this is a gtrs style graph

[chris300zr]

Originally Posted by usdm180sx

HKS GT-RS with HKS 256/264 step 1 cams, 86.5 CP pistons, eagle rods, tuned on HKS FCON VPro. Turbo started spiking after 1.15 bar

this makes me happy to see since im running a very close setup to yours except im using P-FC. what size injectors do you run?

[deukalionS14]

Originally Posted by sbanzer123

vqmaxfan this is a gtrs style graph

i LOVE this set up. your graph looks great!

[Teambadrun]

td06-20g is more sized to a gt2835 HKS aka 3071r

the hks gt-rs = 2871r 52t .64

just clearing things up