GT2871 USERS. SR motor

[BlackZenkiS14]

Sounds like you need a GTX2863R

[xilovelsdx]

Blah I need an upgrade. Jealousy.

[Johannes]

Hey guys! I've been looking through this thread from time to time and thought I should post my setup..

320whp/330tq with messed up internal wastegate.

@ 5.5k it would see 18-19psi and it would start to lower around 6k and see about 15psi and would start lowering even more going to redline.

Mods;
Isis RS3871 (Similar to 2871r so pardon me if I shouldn't be posting in this thread) (Internal WG), Megan Racing Mani
With a crappy mbc
Tomei Poncams
Deatschwerks 740cc
Z33 Coilpacks
Fuel Pump Relay
R.S. Enthalpy


I'm now running stock mani with external wastegate setup (38mm)
Feels a lot better now and quicker.

Dyno graph;


Video;

[Mesarina]

went to te dyno today..

sr20det
bc (264)stage II cams
18psi
740cc
z32 maf
apexi power fc




the map is made by me, I need to make it richier from 2700rpms to 5000rpms, althrough the dyno wideband wasn't reading correctly... (reading leaner)

[240ss]

Originally Posted by Mesarina

went to te dyno today..

sr20det
bc (264)stage II cams
18psi
740cc
z32 maf
apexi power fc




the map is made by me, I need to make it richier from 2700rpms to 5000rpms, althrough the dyno wideband wasn't reading correctly... (reading leaner)

looks pretty good man. I have the same set up as you except i have the non-maf pfc. Similar power numbers too.

Having been plagued with boost control problems, I'm now about a weekend away from dropping this bad boy back in, new and improved!

[cotbu]

Originally Posted by Mesarina

went to te dyno today..

sr20det
bc (264)stage II cams
18psi
740cc
z32 maf
apexi power fc




the map is made by me, I need to make it richier from 2700rpms to 5000rpms, althrough the dyno wideband wasn't reading correctly... (reading leaner)

If you want a real opinion, I can give you one later, but ill will say this. Your peek power numbers are on point, but...

Sent from my Highly Tune Galaxy S3.4!!!

[aga]

if the dyno wideband was reading leaner and it shows 11:1 on the high rpm, you can go way leaner, there's a lot of power to be unlocked in your program.

[Mesarina]

Originally Posted by 240ss

looks pretty good man. I have the same set up as you except i have the non-maf pfc. Similar power numbers too.

Having been plagued with boost control problems, I'm now about a weekend away from dropping this bad boy back in, new and improved!

Nice! I need an external wastegate asap..

Originally Posted by cotbu

If you want a real opinion, I can give you one later, but ill will say this. Your peek power numbers are on point, but...

Sent from my Highly Tune Galaxy S3.4!!!

but???? small area under the curve? laggy?

Originally Posted by aga

if the dyno wideband was reading leaner and it shows 11:1 on the high rpm, you can go way leaner, there's a lot of power to be unlocked in your program.

I will try this, I have about 9-10 timing on the lower cells (17-20) on the pfc about 18psi, if I put more timing, I get knock readings of 60 or higher, isn't that too low timing?

[Tom N]

Originally Posted by Mesarina

went to te dyno today..

sr20det
bc (264)stage II cams
18psi
740cc
z32 maf
apexi power fc




the map is made by me, I need to make it richier from 2700rpms to 5000rpms, althrough the dyno wideband wasn't reading correctly... (reading leaner)

Peak HP number looks good even if its a little rich but the torque number seems low.
You also need to rev it out longer.

[aga]

Originally Posted by Mesarina

Nice! I need an external wastegate asap..
I will try this, I have about 9-10 timing on the lower cells (17-20) on the pfc about 18psi, if I put more timing, I get knock readings of 60 or higher, isn't that too low timing?

adding more fuel won't solve knocking from ignition... keep your AFR on the high boost areas at around 1:11.5 to be safe, and the ignition you will run depends on what fuel you are gonna use. 9-10 sounds reasonable, i have tuned cars with even less on high boost, like 4-5

if you wanna run higher ignition and be knock free, maybe its time to look into water-meth injection.

[codyace]

Originally Posted by Mesarina

Nice! I need an external wastegate asap..

Just let me know when, shoot me a PM and we can help ya out It'll look just like the one 240ss posted

Originally Posted by Tom N

Peak HP number looks good even if its a little rich but the torque number seems low.
You also need to rev it out longer.

I agree spinning to 8000 shouldn't be an issue but his peak power is aleady falling off...I'd solve that first as a 2871r should be peaked/hold to redline.

Originally Posted by Johannes

Hey guys! I've been looking through this thread from time to time and thought I should post my setup..

That's one of the better running ISIS setups out there. nice.

[Silverbullet]

Originally Posted by codyace

With that said, I'll be swapping in S4's into my car soon to see the difference. After many years I'm gonna give them a try to see.

Hey Codyace, just seeing if there was any update on where you are with this?

[Ka-t in progress]

I'm running s4's on my set up. Running 740cc injectors,apexi .8mm headgasket,intake mani,and a precision 5128 .64 ar. Same as a 2871. Set up runs smooth with an enthalpy tune,almost forgot to add that to the list. I know it pulls pretty hard in the higher Rpm's on 17lbs. Cannot say for sure where I have full spool at. Right now it is very laggy,but I am blaming that on my mbc. I should have my car back from the shop in a week or to so I'll be sure to chime in after I tune thru the internal gate,external is the way to go. Will be looking into that soon codyace!

[codyace]

Originally Posted by jaysgottaredtop

this.

i just switched from a DBB S15 T28 to a 2871R. the s15 turbo was quicker getting in to boost, but dear jeebus the 2871 has gobs more top end.

And this applies to the 28RS too...the 28RS undoubtedly responds quicker than the 2871r and GTX turbos, I've been in cars with both, built setups with both, and really think for a hot 325ish whp setup,. the 28RS is still the ticket. However anything above that, I love the 2871r for the 6500RPM+ gains.

Originally Posted by Silverbullet

Hey Codyace, just seeing if there was any update on where you are with this?

I touched the engine with the cams in them this weekend, but we got too caught up in craft beer to take them out. For spring for sure.

Originally Posted by Ka-t in progress

Right now it is very laggy,but I am blaming that on my mbc. I should have my car back from the shop in a week or to so I'll be sure to chime in after I tune thru the internal gate,external is the way to go. Will be looking into that soon codyace!

the mbc and internal gate can certainly be a lead issue for the lack of response for sure, but is your timing set correctly?

And let me know when you want the manifold sorted

[zurud]

more and more people with less than 400whp below 20 psi. Full spool above 15 psi around 4k. Just like mine. I am going t3 next year. I know now I will never get 400 whp on pump gas with this turbo. I am selling mine. Fuck this gt2871r

[Tom N]

So run more than 20psi if you want around 400hp

[S14DB]

Originally Posted by codyace

And this applies to the 28RS too...the 28RS undoubtedly responds quicker than the 2871r and GTX turbos, I've been in cars with both, built setups with both, and really think for a hot 325ish whp setup,. the 28RS is still the ticket. However anything above that, I love the 2871r for the 6500RPM+ gains.

What about the GTX2860R?

[codyace]

Originally Posted by S14DB

What about the GTX2860R?

If you're not taking advantage of the higher boost, it's not worthwhile (to me). If you're gonna sling 25 psi and be ok with 350psi, cool..if not...go with the tried and true disco potato.

[Theyoung1.]

Finally finished reading this intire thread and had to join zilvia...

My set up is similar to codyace...

vct s14 sr20det
87mm 9.1 comp pistons
stock exhaust mani
gtx2867,t25+ t31 .63ar turbine housing moded with tial mvs external gate
nissmo 740cc, aeromotive A750, aeromotive fpr
JWT S4's 5 angle valve job and a polish no porting

hoping my high port intake and vct will make up for the torque loss on the higher dur. of the s4s but make some awesome numbers up top..

im building the car for road course racing/super mean street machine

codyace had a chance to try out them s4's yet?

[Kingtal0n]

I will try this, I have about 9-10 timing on the lower cells (17-20) on the pfc about 18psi, if I put more timing, I get knock readings of 60 or higher, isn't that too low timing?

1. Get your in-car wideband to read 11.4:1 and the dyno's wideband to read 11.8:1
2. Make sure you are using 93 octane and have 9:1 compression or less
3. Use 7-8* of ignition timing through 3000-5000rpm, and slowly add 1* per 1000 rpm so you end up around 10* at 7000rpm etc...

4. You can add a global +2* Across the board on the dyno to see how much extra torque you get back. If you gain only a tiny bit (you will always gain something) then go back down. But if you gain like 20+ then keep it and consider adding another 1-2*.

[aga]

the power fc and all the ecu's knock reading IS reliable. however, its up to the tuner to "feel" how much knock is acceptable. i was in a seminar by AEM, and the tech was tuning a t51 supra we had. this supra was tuned to 20 deg advance at 1 bar with the previous ecu. the tech started retarding the ignition, until the car was running 6 degrees. the owner , who was a tuner himself says to him what are you doing man? -but the car is knocking, the ecu says so. so they put both a phormula knock monitor and also det cans (headphones) and he says keep turning up the timing. does it knock? no. finally they got back to 20 degrees, and the car gained 150hp.
on the phormula , the guys that were using it say up to 50% is acceptable. i dont know. i wanna retune my own car with an external knock monitor cause i think the FC is overreacting. i was hitting insane knocks at 1 bar (125-150) and since i tuned it , i have max 25-35, but the car is really sluggish compared to before. i'm thinking of going water-meth to get back my missing timing...

[codyace]

Originally Posted by zurud

more and more people with less than 400whp below 20 psi. Full spool above 15 psi around 4k. Just like mine. I am going t3 next year. I know now I will never get 400 whp on pump gas with this turbo. I am selling mine. Fuck this gt2871r

Yes, bigger turbos, that's the answer!

Originally Posted by Theyoung1.

im building the car for road course racing/super mean street machine

codyace had a chance to try out them s4's yet?

Come spring time I will

[Theyoung1.]

Come spring time I will [/QUOTE]

I'll have mine running in the next few weeks I'll post my numbers when I get on the dyno. Enthalpy will be tuning.

If you had to put it into numbers what do you believed you gained with the extrude hone?

I also have some questions about your ignition system as 400+ for spitfire coils seem a bit much... I'm a noob so still learning... Are you running more powerful coils with individual igniters and firing them with the stock igniter or how does that work.. any help would be greatly appreciated!

[Tom N]

Originally Posted by Theyoung1.

Come spring time I will

I'll have mine running in the next few weeks I'll post my numbers when I get on the dyno. Enthalpy will be tuning.

If you had to put it into numbers what do you believed you gained with the extrude hone?

I also have some questions about your ignition system as 400+ for spitfire coils seem a bit much... I'm a noob so still learning...[/QUOTE]

You bringing the car down here to Tampa?

[Theyoung1.]

That is the plan in the future but with my schedule I'm extremely busy at the moment.. I've emailed back-and-forth with Martin a few times good help and excited to have the build going!

[BlackZenkiS14]

Which exhaust gasket are you guys using? The OEM 7-Layer Nissan one? or the Mr Gasket copper one?

Which one is higher quality, more durable?

[Tom N]

Originally Posted by BlackZenkiS14

Which exhaust gasket are you guys using? The OEM 7-Layer Nissan one? or the Mr Gasket copper one?

Which one is higher quality, more durable?

I have the stock 7 layer one and have removed the exhaust manifold twice and each time it reseals with out a exhaust leak.

[sil14zenki]

exwg on stock mani now for about a month and i couldn't be more pleased
19psi all the way to redline. i highly recommend it.
anyone running e85 with the 2871r?

[ultimateirving]

Originally Posted by sil14zenki

exwg on stock mani now for about a month and i couldn't be more pleased
19psi all the way to redline. i highly recommend it.
anyone running e85 with the 2871r?

I run ethanol full time. From t28, to my gt2871r now. I love the corn

[sil14zenki]

they just opened a station 2 miles from my house so i have been really considering it. i already have a 340 pump. thinking of some id1000s and obviously tune. how much psi are you running? i know there are alot of positive things from running e85-more timing, more boost, better temps etc. just wondering if its really worth it with this turbo.