max boost on a tuned s15 turbo

[Nu2ThESc3N3]

hey whats going on guys? im sure this has been covered somewhere but i was just wondering what is the max boost you can safely squeeze out of an s15 turbo if you get it tuned, ? i heard mixed reviews, some say 10 PSI some say 18PSI? i am looking for in the vicinity of a reliable 320-340WHP. Right now im puttin out 224WHP on my t25 at 13PSI but i want more, what supporting mods will i need other than the tuning software(and what software is recommended for an s13 blacktop) and 550cc injectors, turbo manifold? new intake piping ? downpipe ? i have a greddy/trust downpipe now....can i reuse that when i upgrade? any input is greatly appreciated thanx guys....

[Sil80315]

18psi should be the most you should go on that turbo. if your looking for 340whp maybe think about getting bigger cams

[david200095367]

you can maybe hit 320 whp with supporting mods. but ive never seen anyone hit 340 whp on s15 turbo.

[supreamS14]

18.5 is the max boost on the compressor map for the Gt28r(S15 turbo). Some places say 300whp and some say 330whp. Look into codyace's build. He took a 2871r that was thought to only get 350whp max and squeezed out 400whp! I want to do something similar with my S15 turbo by smoothing out the inner castings of both housings and my stock manifold with a dremal or something like that because I cant afford to get extrude honed. It should be fun. I love how I start boosting @ 1400RPM and hit max boost (8-18.5 psi)@ about 2500RPM!

[Nu2ThESc3N3]

im not lookin to modify the s15 turbo but DEF some good info thanx a lot ... if im gonna have to modify the turbo im gonna just be patient and save more $ to get a bigger turbo.... any suggestion to what tuning software to use( most cost effective of course ) aka biggest bang for buck... a reflash would kinda be pointless cuz im sure im not gonna be able to just dump all that cash at once ...

[pauliedrft]

how much do you have saved up cause heres a gt2871r for cheap brand new no actuator but i would recommend the hks waste gate any how . It should fit i emailed them to make sure .

http://www.staticxmotorsports.....aspx

[david200095367]

yea will see how long until the oil seals blow. seems to me like hes running it at 100% so turbo will obviously have a shorter life spam. you want good reliable power not just power for a few months. But i guess if you run it at 100% only when needed it would prob be ok.

[Nu2ThESc3N3]

thanx pauliedrift... i apprecaite all your help guyz, really making it soo much easier than a VERY expensive trial and error session lol

[pauliedrft]

Not a problem im planning on getting the same one right after i order my notch top . And some other goodies to go with it but good luck ..

[Nu2ThESc3N3]

thanx... im tryin to figure out where to post pics of the new toy....this way i can show the progress as i go along...

[supreamS14]

Make a build thread!

[Nu2ThESc3N3]

i just posted, in the general forum, wit a couple pics. i would make a build thread, but im not gonna be building it fast enough for any1 to really want to pay attention to the thread lol... and what area could i post that in with out getting it deleted ?

[pauliedrft]

This is the only problem i can see . its for a rb26det if its not a problem to fit the dump pipe please tell me cause im not 100 % sure i just went through my saved web pages fopr my swap and found it out . If it will work please tell me .

* Ball bearing* Oil & Water-cooled bearing system* T25 turbine inlet flange with threaded bolt holes instead of traditional through holes* Turbine housing has a unique "compact" 5-bolt outlet that is not interchangeable with traditional T25 5-bolt outlets* Turbine housing is cast from high-nickel "Ni-Resist" material for extreme applications* Turbine wheel is cast from "Inconel" material for extreme applications* Provides better boost response than the 743347-1 & -2 turbochargers* Direct replacement upgrade turbocharger for GT2556R (702987-7) on Nissan RB26DETT used in Skyline R34 GT-R* Great size for applications w/ packaging constraints* Ideal for smaller displacement engines making up to 460 hp* Actuator not include

[Nu2ThESc3N3]

paulie drift... im not sure i follow what that post is in reply to ... sorry if my mind is in a million diff places at once....

[Clawhammer]

I'm on my phone right now so I can't link you without a ton of work, but just search for gt28r (as you should have done from the beginning!) and content created by me (to narrow it down) and you'll find a thread with most of the answers you seek. Things such as adapter plates or intakes, oil restrictors, etc.

After a month of 18ish psi my head gasket gave out.

[pauliedrft]

paulie drift... im not sure i follow what that post is in reply to ... sorry if my mind is in a million diff places at once....

i was really tired when i found this turbo for 899.00 brand new i sent them a message if it would work on a s-14 sr20det and they said it should but when i went to my old link yesterday (Garrett turbos .com) i found the info i posted above . I work really messed up hours so im usually on here when im really tired lol

Thanks claw hammer ill look .im just trying to save 2-3 hundred dollars by buying this one here if it will work .. And i had posted to the op that they said it would work so i wanted to post the info i found .Just in case he went to buy this one .

[Nu2ThESc3N3]

oh ok ... got ya... but can you replace the head gasket with a beefier 1 with out havin the top of the block and the bottom of the deck re surfaced ??? cuz i had read and heard from various people that when removing the head from the motor that you technically should have them "decked" im sure you can get away without doing so but is it a good idea ?

[nzmoman]

if you want to do it right and get the head and block to seat together well, then you should take the extra step. Its a toss up as to whether or not you will have issues if you don't. Also, if you are running a good tune with an s15 turbo, your factory gasket should be okay provided that you are running proper cooling mods and not beating the hell out of the motor all the time. remember aluminum can warp pretty easily if abused. I run that turbo right now and I won't be replacing the gasket until/unless it goes out.

[mRodiek]

clawhammer knows his $hit--- zerothread?id=362808

if you upgrade then youll need one of these- http://www.frsport.com/FRSport....html

you can run like 7-8psi w/o upgrading injectors & a tune, so for a bare bone swap you need the kit from above+fuel pump+boost controller [assuming you already have an intake & FMIC]

i was debating between this and upgrading my suspension..i went with the latter

[pauliedrft]

Im dropping in a notch top .. but i found my answer about the gt2871r turbo i found its just going to be cheaper to buy the correct turbo .Its the rb26 turbo upgrade gt2871r i was thinking of buying and i found the thread on you need to buy the outlet pipe due to the 5 bolt compact design here on nico . so thanks alot ..

[bagnasco]

I'm not sure what a safe boost range is for the S15 SR20DET yet. Haven't been able to find it. But I did find that stock boost on the S15 T-28 turbo is 11psi.

I'll keep looking for you though.

[Clawhammer]

Thanks for posting that for me driftboy.

To all the people saying the stock paper gasket should be fine for that boost level on a bigger than stock turbo...well maybe it is, maybe it isn't. I'm proof it wasn't.

http://www.beyondthedyno.com/Blogs/Eric/?p=703

^Read that about SR head gaskets.

[supreamS14]

I had to drill some xxtra coolent holes in my cosworth HG around the cylinders as they were blocked off!

[Nu2ThESc3N3]

SICK info i def have to thank you all... but let me be more specific... im gonna run by you the setup im planning and you guys can tell me if im Dreaming or living in reality...

Greddy FMIC740cc Deatsch Works injectorspeak performance turbo manifold(bottom mount)z32 MAF s15 turbo 16-18psi(KABOOM?)(should i just go 2871/76 with hks actuator ?walbro 255lph fuel JWT SR ECU

=

320ish whp?????

am i in fantasy land or is that possible? given that any one of those are subject to change if any1 has some info that i dont know also i want it to be reliable i dont want to be gritting my teeth and cringing everytime i ROMP on the throttle.....

[Nu2ThESc3N3]

and of course im definately open ears to a suggestion to more HP ... just really dont want to build the bottom end unless it Grenades... (praying it doesnt Grenade)

[burntricer]

full race quotes the s15 turbo efficent up to 20lbs

[mRodiek]

i think you might be better off with smaller injectors- im not 100% so dont quote me -but i think your injectors are best at 80% duty cycle aand with the big 740s you might not be close to that & ive read that the 555 will work finebut do some research n find out

[pauliedrft]

SICK info i def have to thank you all... but let me be more specific... im gonna run by you the setup im planning and you guys can tell me if im Dreaming or living in reality...

Greddy FMIC740cc Deatsch Works injectorspeak performance turbo manifold(bottom mount)z32 MAF s15 turbo 16-18psi(KABOOM?)(should i just go 2871/76 with hks actuator ?walbro 255lph fuel JWT SR ECU

=

320ish whp?????

am i in fantasy land or is that possible? given that any one of those are subject to change if any1 has some info that i dont know also i want it to be reliable i dont want to be gritting my teeth and cringing everytime i ROMP on the throttle.....

Go with the gt2871r if thats your horse power goal ,then go with the .64 a/r it will spool quicker than the .84 a/r but the 84 is capable of more horse power .

[Nu2ThESc3N3]

aight sooo edit... ill go wit the gt2871... i was kinda leaning towards that anywayssss.....64 trim wit hks actuator...soo now my numbers that im looking for are attainable ?

[pauliedrft]

Oh yes with the .64 a/r i just read the febs issue of modified mag Silvia tech and he had his head ported and polished and of course tuned 387 whp so i don't think youl have a problem reaching your goal .Just if you don't have the supporting mods for running higher boost then keep it low and if you don't have a wide band ,get one there a good tool to have .And don't get the one i mention above . i just going to order the upgrade kit from enjuku ,for my set up .

http://enjukuracing.com/gt2871...24_80

For me itl be 1499.00 cause i will be using the notch top . but it cuts allot of the b.s guess work out .