ISIS RS3871 install thread

[ultimateirving]

To begin my old turbo was starting to fail spitting out quite a bit of oil in the hot pipe. I bought a new one recently, and sunday me and 2 buddies started taking it all apart!

I got the ISIS rs3871 plan to be running around 18-20psi of boost.
heres some pics of the install

New turbo with mocked up intake elbow, 3in intake is so tight!
http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG305.jpg

stock turbo as it sits

http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG306.jpg

Here is empty engine bay, cleaned up the exhaust mounting surfaces on both the head and manifold.
http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG308.jpg

last 2 pics are after install was pretty much complete.
Here is my ghetto ram air haha, Only way i could get it to hook up with what little 3" intercool pipes i had. i need to get my car down to my fabber sometime this week to get the hard pipes redone so i can fit my intake inside my hood.
http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG309.jpghttp://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG310.jpg

Car was running today, but one of the coolant lines wasnt fully tightened and is leaking coolant, gotta tighten that up.

also need to rerun the 02 sensor signal wire to my ecu since i removed my stock 02, and plan to use the simulated narrowband from my Innovate lc1.

Was a fun experience, first time changing turbos, took longer than expected(when does it not?) didnt have to much of problems fitting it in there. Just needed a little muscle and wiggles to get it in and out.

More of my build is done now and i will report on performance soon, ill try to get to a dyno within a month or so to really compare to what my stock t28 put out.. i was at 300hp at 15psi before.. so hopefully this thing can make a bit more, without being to laggy
thanks for reading!

[unreal-]

Looks good! I got a few questions:

Did you use 14x1.5 coolant fittings for the turbo? and if so, do they require teflon tape?

Also, when does the turbo spool? and what is the wastegate set at from the factory? Ive been told 8-10psi but no one knows for sure, even enjuku lol.

Im throwing this on my KA in a few weeks :)

[ultimateirving]

hey man! i had stainless lines from my other turbo, so im unsure of fitting sizes. I did not use any teflon tape.
Havnt got the chance to run turbo yet, been to busy with work to finish up the little things i need to, to get it on the street.
and i swapped the Wastegate actuator with my HKS one i bought. However the isis WGA is adjustable, so im sure you can get it to work.

[Corbic]

I don't think that air-filter is going to clear the hood...

[unreal-]

hey man! i had stainless lines from my other turbo, so im unsure of fitting sizes. I did not use any teflon tape.
Havnt got the chance to run turbo yet, been to busy with work to finish up the little things i need to, to get it on the street.
and i swapped the Wastegate actuator with my HKS one i bought. However the isis WGA is adjustable, so im sure you can get it to work.


Thanks. i bought some 14x1.5 banjo to 3/8 hose adapters from ATP turbo for my coolant lines. Going to grab coolant from the TB circuit.

I understand that the WG is adjustable, i was just wondering what it is set at out of the box.

ill be keeping an eye on this thread :) I really want to see how the turbo performs from people that actually have it and use it.

[ultimateirving]

well im still waiting to get my car going, i been to busy with work. Turbo is on just havnt gotten to fine tune things yet.
only been able to verify it idles and no boost leaks

And since my swap, based on pics from Circuit Sport, i have their stainless braided lines.

[jsu1012]

subscribed. I'm curious to see how this turbo performs against your old setup.

[unreal-]

any updates?

[ultimateirving]

sorry guys, i know its sounds crazy but i havent even had time to take my car out.. Went out of town for a funeral.. but im back home now.. hopefully this tuesday ill get it going and can get some good "butt dynos"

[Frank_Jaeger]

Cut a whole in ur hood and let the intake hang out!1

Mad tyte

[Jez]

I'd be interested also to see how this performs, but I'm more interested in how long it lasts!

[jsu1012]

I'd be interested also to see how this performs, but I'm more interested in how long it lasts!

I'm right there with you . lets see how this goes..

[ultimateirving]

OK Guys, Initial run. Primed turbo, Cranked engine 4 times for approx 15 secs with injectors disabled. Reconnected injectors, and she fired right up =)
Let her idle for a bit some of the smoke burnt off.

Took it out, Stock ISIS waste gate Approx 12.5-13psi full boost around 3500.
I have Freddy Intake mani and stock head.

Now im gonna recheck all my connections and take it out crank it to about 18psi.
Lets see how it holds up.

[ultimateirving]

So after some work with my boost controller.. trying to reset it. Blew a coupler and had to pull off to fix.
But got it to boost 18psi no problem 3600ish came on hard(no homo) However this is on 91 oct and its running rich, like 10's. 850cc injectors are for my e85, i need to switch tunes back to really feel the power... We shall see.
Prev dyno on s14 t28 with same mods was 298Hp.
http://i3.photobucket.com/albums/y70/guitarist_of_punk/Hpdyno.jpg

This thing was pushing 15psi, and about 12.0 a/f
http://i3.photobucket.com/albums/y70/guitarist_of_punk/afrdyno.jpg

[jsu1012]

good shit!

[ultimateirving]

Been driving for a few weeks now. Turbo pulls hard. I need a newer boost controller or soemthing. Mine is very slow to respond (HKS EVC III) i been over boosting hitting at least 20psi.. which is where my boost controller caps out. But its running rich in boost so i need a retune for sure

[jsu1012]

I want to see some video of it pulling.

[TAP240]

my t28 bb turbo went out on me so I'm looking in to the the isis sr20 replacement turbo...
From what you've posted so far, these isis turbo's don't seem too bad.
*subscribed; I too would like to see some footage of the car pulling.

[ultimateirving]

So i Know its been a while since ive posted. Went out to the drag strip last night. SPeedworlds annual Midnight Run. Was hella busy only got 2 runs in for the 2 hours i was there. New personal best of 13.99 @ 105.00mph. 2.19 60' explains why i slipped first gear well off the line, but immediately lost traction once boost built. Missed second due to old beater tranny. Finally got into gear, and still at full boost the rear end breaks loose again. 3rd gear hooks good, and so does 4th. SO yeah turbo was great. spools great til i shift at 7k.

oh ya i busted my head open on the corner of my hatch, had blood coming down my face

[ForeignMuscle]

Did you say your old setup was using a t28 and it made 300HP at 15psi? What supporting mods, cams? Correction factor on the dyno? T28's usually do not make that power without pushing them past 18psi so I'm curious how yours did. A basic bolt on sr20det with a 2871r makes around 300whp @ 15psi. Good write up. I looked into these turbos at one time. Interested in what it can do.

[ultimateirving]

Did you say your old setup was using a t28 and it made 300HP at 15psi? What supporting mods, cams? Correction factor on the dyno? T28's usually do not make that power without pushing them past 18psi so I'm curious how yours did. A basic bolt on sr20det with a 2871r makes around 300whp @ 15psi. Good write up. I looked into these turbos at one time. Interested in what it can do.

Mods are the same as what is in my sig, e85 plays a major factor in the power produced. and this is on a Dyno Dynamics Dyno so numbers are pretty accurate. The new turbo Im trying to keep around 18-19 psi. so i expect 350 whp np.

dyno website here
http://www.dynocomp.com/

[ForeignMuscle]

I noticed the e85 after I posted. I was confused for a moment. I think it should be close to 400hp with the Isis.

[zurud]

105 trap indicate 270whp the most. I believe in trap speed more than dyno rating. Trap speed don't lie. If you can trap more than 120, then you have 400 hp.

[ForeignMuscle]

Trap speeds don't lie, but rear tires do.. If he couldn't catch traction, how do you expect the car to show it's full potential? Trap speeds are useful when you post an ideal run. Not when you spin all over the place and miss shifts.

[ultimateirving]

Haha skeptics eh. I have 225 street tires in rear and partially bald. I was trying to find some Dr's but no luck. So my times suck ass.
ps
my friend was also their with his turbo probe, rated at about 340 whp, he ran 12.8 @115 with drag radials, so it makes a huge difference being able to hook up.

[TAP240]

Just installed my ISIS RS this past weekend, waiting for my valve cover to get back to start the car up..(not to thread jack lol) but I'll let you know how my results are as well..

[ultimateirving]

Just installed my ISIS RS this past weekend, waiting for my valve cover to get back to start the car up..(not to thread jack lol) but I'll let you know how my results are as well..

yeah man! thats good, no worries we can make this RS3871 info thread for all to read

[TAP240]

yeah man! thats good, no worries we can make this RS3871 info thread for all to read


Sounds good to me! I used my stock turbo lines (coolant and oil) and stock copper washers...did you do anything different? The copper washers don't seem to seal the best.

[Pinggg]

Sounds good to me! I used my stock turbo lines (coolant and oil) and stock copper washers...did you do anything different? The copper washers don't seem to seal the best.

Should of gotten AN turbo lines while you were already there changing shit.

[EsChassisLove]

try tuning the damn thing already.

[TAP240]

Should of gotten AN turbo lines while you were already there changing shit.

Thought about it..but I saw that the stock lines would work so I figured I'd give them a try.

[ultimateirving]

I used my upgraded stainless lines, for coolant, and a had a custom oil line made from my fab guy. still uses the banjo bolt to reduce the oil pressure.

[TAP240]

I ended up just putting some silicone gasket sealer around the fittings, seems to be stopping any leakage.
Did some pulls today with the new turbo...slight lag, not too bad though..at full boost about 3800-4k. But the boost comes in STRONG! my AFRs are at about 10.9-11.2 during the heat of the day, and when it cools down at night they are at about 11.3-11.5, right where I like them. I've no complaints about it what-so-ever:2f2f::bigok:

[ultimateirving]

right on man.
for the price its a little sledgehammer. Hits hard haha.

[TAP240]

right on man.
for the price its a little sledgehammer. Hits hard haha.

oh no doubt! lol How's yours running?

[ultimateirving]

oh no doubt! lol How's yours running?

Everything is straight for now, Could use a retune, for Phoenix conditions(mine is a mail order rom tune)
Also my boost controller is tired, and doesnt open the waste gate very quickly. so i often over boost, hitting my boost limiter, bleeding boost to 15psi..

And last complaint, tranny is pos. shifting from 1st to second at high rpms grinds.

But other then that, life is peachy. Loving my coilovers i put on 2 mos ago as well.

[TAP240]

Everything is straight for now, Could use a retune, for Phoenix conditions(mine is a mail order rom tune)
Also my boost controller is tired, and doesnt open the waste gate very quickly. so i often over boost, hitting my boost limiter, bleeding boost to 15psi..

And last complaint, tranny is pos. shifting from 1st to second at high rpms grinds.

But other then that, life is peachy. Loving my coilovers i put on 2 mos ago as well.

nice nice! sounds like a few tweaks here and there and you'll be golden!

[Nisbro]

Ive been running this turbo on a basically stock s13 SR for a few months now, and i love it! Its a bit laggy on a stock motor, but ill be able to fix that soon. I havent had any problems with this turbo what-so-ever, and highly recommend it if you're looking to save money wherever you can!

[ultimateirving]

Switched back to 91 octane for the time being, been doing more long distance driving.. Boost is still strong hitting 21psi in 3rd is wicked!
Stock head and bottom end, hope it holds out lol.
22.5mpg with a/c on in az heat.. not too bad for 91.


also, i notice, at idle my vac is like -10-(-12) mm/hg. where are u guys at, it was closer to -18 with my t28.
I boost leak tested my whole car and it runs fun so no, there is not a vac leak. No my bov is not leaking at idle, Just want to know if any other RS3871 owners have noticed this.

[Trinidrift3]

Switched back to 91 octane for the time being, been doing more long distance driving.. Boost is still strong hitting 21psi in 3rd is wicked!
Stock head and bottom end, hope it holds out lol.
22.5mpg with a/c on in az heat.. not too bad for 91.


also, i notice, at idle my vac is like -10-(-12) mm/hg. where are u guys at, it was closer to -18 with my t28.
I boost leak tested my whole car and it runs fun so no, there is not a vac leak. No my bov is not leaking at idle, Just want to know if any other RS3871 owners have noticed this.

i have heard that after undgrading turbos, your vaccum will go down. just what i heard.

btw can anyone recommend whether this or the godspeed td05 18g is better for a stock redtop sr20. i have heard great reviews on both

[TAP240]

at idle my vac is at about -17 to -15, and when in gear under decel my vac goes right to -21. (from what I've experienced with other cars and reading up, that's about right)

[[email protected]]

ultimateirving - Im glad you are happy with the turbo, if you do get any videos please post up.

[ultimateirving]

This Turbo really pulls. Was holding 20psi all day! Well I boosting hard this morning, my boost blewout/melted a coupler. so i had to pull over and fix the giant vacuum leak.
Here is a picture of the carnage, cheap ass orielly parts. I gotta order some of the silicon triple layers couplers.
http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG435_zps87cc3d38.jpg


And this is how i made it home. Electrical tape ftw,
http://i3.photobucket.com/albums/y70/guitarist_of_punk/IMG433_zpsfab363f0.jpg

was able to cruise to orielly on the way home to get a temporary replacement and return this POS

[Jayem]

I've had my rs3871 for a couple of months now and it pulls hard just on stock 8 pounds. How do you have your boost controller hooked up? I'm ready to turn up the boost and not quite sure how to hook one up on the 3871

[ultimateirving]

I've had my rs3871 for a couple of months now and it pulls hard just on stock 8 pounds. How do you have your boost controller hooked up? I'm ready to turn up the boost and not quite sure how to hook one up on the 3871

You can hook up a boost controller on any turbo. The controller goes in between the turbo and the waste gate actuator, depending on if its manual or electronic they hook up differently, but there are plenty of diagrams available on the web.

[unreal-]

I've been having problems with my 3871. For the past few weeks ive been tracking down a overboosting issue. Ive replaced all visible vac lines, FPR has its own vac line from manifold, BOV and boost gauge share a source. Hallman MBC is installed, but it overboosts whether it is installed or not.

Boost leak check revealed no leaks except at the turbo itself. Sounds like its coming from the CHRA area. Rest of the motor is air tight (FMIC couplers, injector o rings and insulators, TB and IM gaskets, EGR blockoff gasket, BOV flange)

My setup:

3871 with garrett 7# actuator
ISIS FMIC
ISIS V1 manifold+dp+elbow
Five-o 580cc inecjtors
Enthalpy tune
Z32 MAF

[Pinggg]

^^ give ken @ enjuku a call.

[ultimateirving]

I've been having problems with my 3871. For the past few weeks ive been tracking down a overboosting issue. Ive replaced all visible vac lines, FPR has its own vac line from manifold, BOV and boost gauge share a source. Hallman MBC is installed, but it overboosts whether it is installed or not.

Boost leak check revealed no leaks except at the turbo itself. Sounds like its coming from the CHRA area. Rest of the motor is air tight (FMIC couplers, injector o rings and insulators, TB and IM gaskets, EGR blockoff gasket, BOV flange)

My setup:

3871 with garrett 7# actuator
ISIS FMIC
ISIS V1 manifold+dp+elbow
Five-o 580cc inecjtors
Enthalpy tune
Z32 MAF

any reason your not using the ISIS adjustable wastegate actuator?
because the factory ISIS WGA holds about 12-14psi... and you should not be able to overboost without a MBC hooked up..

If it is still overboosting means ur wastegate isnt opening, disconnect the actuator and see if you can swing the flapper.

[unreal-]

any reason your not using the ISIS adjustable wastegate actuator?
because the factory ISIS WGA holds about 12-14psi... and you should not be able to overboost without a MBC hooked up..

If it is still overboosting means ur wastegate isnt opening, disconnect the actuator and see if you can swing the flapper.

I thought that the WGA was the culprit and replaced it with a ATP/Garrett WGA. And i was told that it (the ISIS WGA) holds 8# out of the box at its lowest setting. Even running straight WGA to compressor housing, and minimal preload, i get overboost once the RPM's go beyond 4000.

The flapper swings freely, and the actuator arm moves without binding.

Have you done a boost leak check with your setup? do you get a hissing sound from that area? Im pretty sure that hearing air from that area isint good. :down:

[ultimateirving]

I thought that the WGA was the culprit and replaced it with a ATP/Garrett WGA. And i was told that it (the ISIS WGA) holds 8# out of the box at its lowest setting. Even running straight WGA to compressor housing, and minimal preload, i get overboost once the RPM's go beyond 4000.

The flapper swings freely, and the actuator arm moves without binding.

Have you done a boost leak check with your setup? do you get a hissing sound from that area? Im pretty sure that hearing air from that area isint good. :down:

hey man sorry i havent replied to this lately, but there should be no hissing from the turbo.
Do you have the crank case vent still hooked up to the intake? I noticed when i temporarily capped the T on the valve cover it made a wierd hissing/whining sound so dont do that.

[codyace]

Sounds like an issue of the internal gate simply not being up to task. You can try preloading the arm a little to see if it will help, but the only real boost creep solution is to go external wastegate. With that said, it may spike a little and then calm back down by 6000/7000 so be aware of that as well.

[mr2gons14]

i got 3871 hooked up a few months back and the bitch pulls hard as hell for the price. just need to get a new damn af gauge (hopefully an aem). I also wanna get a pfc so i can get a tune lol. Currently running an enthalpy but idk i feel better about getting a dyno. Back in az this sat will have my car there mid jan hope to run into a few of u out there or even in cali where im pickin my car up from.

[jamg]

bumping for more reviews on this turbo.

i might run it, as i can't really find a good brand used, for a good price.

[mr2gons14]

Irving and I both run it and its a great turbo for the price order through enjuku and u got a warrenty what more can u ask

[Izento]

About to install my RS3871 on my CA18. I'll let everyone know how it goes.

[Izento]

Install was successful. Boost hits very hard at 4k. Feels weird having a turbo spool so late. Very good bang for the buck though. But keep in mind, I don't have anything to compare it to other than a stock T25.

http://i362.photobucket.com/albums/oo63/Izento/2013-02-12101341_zpsbee341bf.jpg

[ultimateirving]

Install was successful. Boost hits very hard at 4k. Feels weird having a turbo spool so late. Very good bang for the buck though. But keep in mind, I don't have anything to compare it to other than a stock T25.

http://i362.photobucket.com/albums/oo63/Izento/2013-02-12101341_zpsbee341bf.jpg

Awesome to hear my friend! that little 1.8 probably does have some trouble spooling it up but im sure you love how hard it hits when it does. =)
I been running mine consistantly at 17.5psi until i can get some fine tuning done.
need to order a nistune or something

[RedS-14]

Soo happy i found this thread! im running this turbo on 15psi,AFR's 10.0 on aem wide band.Spools pretty good after is got some miles on it.Im suprised how well your OEM hg is taking the 20-21psi! im scured to turn it passed 15 lol.

[ultimateirving]

I killed my rs3871 with a bolt in the inlet, So i bought a gt2871r, Turned boost down to about 18psi now. and thats where ill keep it

[Izento]

http://i362.photobucket.com/albums/oo63/Izento/20131121_172318_zpsd3e6bff6.jpg (http://s362.photobucket.com/user/Izento/media/20131121_172318_zpsd3e6bff6.jpg.html)

225 whp / 205 tq on my CA18 with Poncams, 2.5" downpipe & exhaust. 15 psi.

[tloh]

I killed my rs3871 with a bolt in the inlet, So i bought a gt2871r, Turned boost down to about 18psi now. and thats where ill keep it
THREAD BUMP!!! I MUST KNOW!!!

how do u get a bolt in your piping?!?!?!

[ultimateirving]

THREAD BUMP!!! I MUST KNOW!!!

how do u get a bolt in your piping?!?!?!

I went over it in my head a million times so I can only speculate it must have found its way in there when I was boost leak testing the system. The 90* elbow that feeds the turbo intake points up so it makes a nice catchall

[shorty69187420]

how does the 2871r compare to the Isis Rs3871

[ultimateirving]

how does the 2871r compare to the Isis Rs3871

Someone else asked me the same question. This was my
Answer
For the price the Isis is a good turbo. The Garrett BB one is better although i have the .86 a/r exhaust housing and the .64 a/r housing would spool even faster. The .86 is better on the top end.

[tloh]

how does the 2871r compare to the Isis Rs3871

Its just a journal version of the gt28. A REAL gt2871r will be better in spool and power all around than the 38 isis. The isis is made for a budget turbo for people not wanting to spend 1300 on a turbo. No one has hit 400whp on the 38 isis besides some shops. So take it for what it is. Now an ebay 2871 will be worse than the 38 isis.