ISIS T25/T28 replacement turbo v. S15 T28. Input appreciated

[TAP240]

As the title states, I'm looking for some input on the ISIS T25/T28 turbo replacement option from enjuku (yes I searched and didn't find the results I was looking for). A buddy of mine works for enjuku so he introduced me to this option today. Long story short my S15 T28 is done for, so I took it off the car today and need a turbo ASAP! My current set up is (well was) and SR20det with an S15 T28 turbo..it's tuned with the AEM tru boost, I can change from stock tune, to a 12lb tune, to a 17lb tune; a/f is right where it needs to be in each tune (10.8-11.0 on a hot day and goes to 11.2-11.5 when it cools down at night). The car made 325whp on the dyno with the T28 on 17lbs. My question is, would I still be able to change between tunes and still have the ability to boost at 17lbs with the ISIS replacement turbo (I'll more than likely get the tubular manifold and I'll have to get the o2 housing as well), or will I have to keep the car at the 12lb tune or stock tune? I would imagine that the spool won't be as quick as the S15 turbo, but I don't mind sacrificing a few hundred rpm for the turbo spool. I'm also curious if my dyno numbers will see a drastic difference.
Any insight would be greatly appreciated!

[compactfean]

I am the biggest skeptic when it comes to ”ebay” turbos but my friend has isis EVERYTHING. the t28 turbo is pretty impressive from them at 16-17 psi. I can't vouch for its longevity or hp difference but it kicks a** for what it.is. Only time will show its true durability though.

[TAP240]

I am the biggest skeptic when it comes to ”ebay” turbos but my friend has isis EVERYTHING. the t28 turbo is pretty impressive from them at 16-17 psi. I can't vouch for its longevity or hp difference but it kicks a** for what it.is. Only time will show its true durability though.

I believe it comes with a 2 year warranty...doubt I'll have the car more than a year (I got through cars like candy lol) but this is the first time a turbo has taken a s*** on me, so I'll looking for the most cost effective route to replace to turbo and have a set up as close to the one I currently have. Your saying that the ISIS replacement turbo from enjuku will be fine at 17lbs with the current tune(s) that the car is equipped with?

[compactfean]

Yes, same tune should be fine however 17 seams like its pushing it id you were running it like that 247

[TAP240]

I've only had the car for about a week or so, the car was daily driven by the previous owner for about 2 years on 12lbs of boost...only oil lines were run to the turbo, not coolant, so I'm guessing it was just a matter of time before it went out. I've only put the car at 17 lbs twice since it's been in my possession (about a week and a half), I typically drive it on the 12lb tune or the stock tune...

[OutToWinPAHC]

I'd do the real deal but if you can get it cheap I can send you info to a company who can perform a quality rebuild cheap on that. Most of these chinese turbos have some casting imperfections, crap seals, and arent balance out the gate

[TAP240]

I'd do the real deal but if you can get it cheap I can send you info to a company who can perform a quality rebuild cheap on that. Most of these chinese turbos have some casting imperfections, crap seals, and arent balance out the gate

I've gotten quoted to have my turbo completely rebuilt for about $550...it's got some mad shaft play, and the rear seal is bad..the only way I would get the turbo rebuild would be if I could get it done for around 200-250$ (which I don't see being done lol) but PM me the info for sure!

[OutToWinPAHC]

San Diego forced induction he rebuilt my 60 trim for 200 and my toyota CT26 for 220 dude does awesome work, I have referred him to about 25 people so far guy is super legit, and very cheap (has a huge shop at his home, keeps overhead down and passes the savings)

http://www.sdforcedinduction.com

[TAP240]

San Diego forced induction he rebuilt my 60 trim for 200 and my toyota CT26 for 220 dude does awesome work, I have referred him to about 25 people so far guy is super legit, and very cheap (has a huge shop at his home, keeps overhead down and passes the savings)

http://www.sdforcedinduction.com

was your 60 trim a ball bearing or a journal bearing?

[OutToWinPAHC]

Journal so yeah you cant rebuild that, but if you go the journal route have it checked out I can almost bet that isis unit is out of balance from the door.

[TAP240]

Journal so yeah you cant rebuild that, but if you go the journal route have it checked out I can almost bet that isis unit is out of balance from the door.

yeah, if it was a journal bearing, I'd have it rebuilt tomorrow! lol

I've been doing some reading and researching, etc about the ISIS turbo for about a week now (ever since my turbo blew)..from what I've read, people haven't had many issues with them; but from what I'm gathering, people have yet to see one run on a s14 sr20...not sure if I should buy a used journal bearing t28, or be a pioneer for the ISIS turbo lol. I've been talking to enjuku for the past few days gathering information about the turbo, specs, etc. as well. My issues are, one, I don't have the necessary funds at this point in time to get my turbo rebuilt; two, I can't find a used t28 anywhere (for what it is (or isn't) worth anyway); and three, I need to get my car mobile again, it's my dd..and right now a bike won't cut it lol

[OutToWinPAHC]

Enjuku will push ISIS all day, but at the end of the day some kid in a Chinese factory made it from the cheapest of parts they could get. I saw your post on Zilvia too, and they are what they are. I'm sure it would work, run a -4 feed with a .065 restrictor and dont crank her up too much.

[TAP240]

Enjuku will push ISIS all day, but at the end of the day some kid in a Chinese factory made it from the cheapest of parts they could get. I saw your post on Zilvia too, and they are what they are. I'm sure it would work, run a -4 feed with a .065 restrictor and dont crank her up too much.

I'm not planning on pushing the car too terribly hard, I'll run it on 12lbs as a daily, it'll hardly, if ever see 17lbs...plus, if the turbo does take a s*** on me, they'll warranty it and I'll get a new one lol. The only reason I'm considering the ISIS as an option is because they're hooking me up big time. I've found a t28 journal bearing and tubular manifold for 500$...but it's used; I'm just not comfortable paying that kind of money for a used turbo, regardless the condition, ya feel where I'm coming from, not unless I get it for a reasonable price. What concerns me is that no one has run the ISIS replacement turbo on an S14 before

[compactfean]

Like I said, running one on my buddies car right now which is s14 head, bigger cams yada yada. Problem is is there is only about 3 months on a fresh motor and has only seen 16 psi like 3 times, and otherwise is tuned at 10 psi for dd. We shall see.

[TAP240]

Like I said, running one on my buddies car right now which is s14 head, bigger cams yada yada. Problem is is there is only about 3 months on a fresh motor and has only seen 16 psi like 3 times, and otherwise is tuned at 10 psi for dd. We shall see.

keep me updated on how the turbo does! I'll keep this thread alive as I progress with the turbo as well. I don't plan on letting it see 17lbs too often...it will spike 17 and hold about 15-16ish. But for dd purposes I'll be tuned on either stock (which I know will be fine) or 12lbs. I'm going full ISIS: turbo, tubular manifold, and 3inch o2 housing...I had a massive boost leak on my last o2 housing to turbo connection, and the turbo was blown, so I haven't felt the real potential that the car had to offer, so I'm thinking when I bolt all this up I won't notice much of a power difference..

[Kr5Kouki]

Wow, OP and I were in the same boat, between the same turbochargers. I considered the Isis 3078r and the S15bb T28. I drove a SR20DET with S15 turbo and fell inlove with spool time, boost pressure and compared to the ebay GT28 from GSP, the boost is more linear with S15 and the Garrett seems to last a lot longer. So I'm buying the S15bb

[TAP240]

Wow, OP and I were in the same boat, between the same turbochargers. I considered the Isis 3078r and the S15bb T28. I drove a SR20DET with S15 turbo and fell inlove with spool time, boost pressure and compared to the ebay GT28 from GSP, the boost is more linear with S15 and the Garrett seems to last a lot longer. So I'm buying the S15bb

I don't blame you there one bit, the bb spool time is much better than a journal bearing (I'm not a fan of turbo lag lol). I actually went with the ISIS RS3871R turbo, rather than the ISIS t25/28 replacement; granted the isis rs is a journal bearing, 17lbs on that rs turbo pulled a lot harder than 17lbs on the s15 bb. There was a bit of a lag, but once boost hit, it was there to stay. I figured I'd rather go slightly larger than my s15 bb, rather than downgrade to a t25-like turbo. Anyway, you'll be pleased with the s15 bb I'm sure!