T28 max boost?

[Luderacer14]

I been reading around and 250 seems to be the max of the T28. What kind of setup do I need to push 300? Thats my goal, i know i need to up my fuel injectors to 550cc, i already got a safc and a wideband. Plus I heard my maf maxes out at 250 horses. But I heard if I had a safc, i don't need to replace the maf. I know, I also gotta do something with timing, I heard the MSD BTM is good, is 300 capable on the T28, i heard of a guy who made that much, but honestly, do u guys think it can do it???

[wild_maxx]

uhh you would have to run like 17-20 psi and at that range the small t25 is just a heat pump. upgrade to a t3/t4. a straight t3 with a .42 ar might put you up at 300 at maybe 14-15 psi. but then again its mostly a heat pump which is not good. just go the the hybrid t3/t4. and yes you need to replace the maf. upgrade to a z32 maf or a q45 maf. 550cc's should be good for 300 hp. and a better fuel pump if you havent already upgraded that. then dealing with timing and spark is a whole nother thing to work on.

[rn240sx]

^ as stated above, the T28 would have to be pushed to 17-18 psi to reach 250 whp.. BUt thats when it will start to LOOSE its efficiency... When this happens, it will start to blow HOT air and detonation will become an issue and u DONT want that...

Stock maf will get u to ~250 whp.

555cc inj will get u to ~350 whp..

Stock ignition is good till 400+ whp... been proven.

Get a t3/t4.... better off..!!

[hannibal]

If youre looking for a cheap OEM turbo, check out the Z31 T3. I'm willing to bet it can hit 300whp (though Ive never seen proof of this). A T3/T4 50 trim will be good choice for a new turbo.

[Luderacer14]

Dang, this sucks!!! I wish i would of went with thet 3/t4 in the first place. Now i'm gonna have to get a new exhaust mani and a T3/T4. I'm probably gonna go for an internal wastegate because it's cheaper. I already got a fuel pump. Thats another $1000 out the door!! I guess i can always sell my old setup. Theres been a few 240s around here lately, i'm sure someones gonna want my mani, turbo and downpipe.

[uncle_louie83]

hey what mani is that? you mentioned its got t2 series flange....for like a t28 or t25? let me know man

lewis

[Luderacer14]

It's a custom log mani for a T28. I gotta wait another 2 months before I get rid of it anyways, I gotta save some money first. It's not a bad setup, it's fun fun fun, but i want over 300 horses and this turbo is not gonna supply it. Heres how it looks.

[uncle_louie83]

when does it start to spool and when do you reach full boost...and does it feel like it chokes out at top end...need some insight man

lewis

[1WheelWonder]

What t28 is that?

[Luderacer14]

It's been 2 months since I drove me car!!! lol. But hopefully it will be running by the end of this week. I had a GST eclipse before and you would feel the lag, this car does'int have any. Boost kicks in insanely fast, i accidently boosted 15 psi once and it was -20 - 15 psi in BLAM!!! lol. I can't tell you the exact, but if i get my car back this weekend, i will find out. It has instant response, it's great. I usually run at 7 psi and it will pull strong to 5500. 5500 is where the peak power of the engine is anyways. It pulls pretty even throughout the power band. It sucks driving in the rain, i spun in almost every gear at wot, lol. that was in the RAIN... I really need better tires though. Top end is fine, it bogs at 15psi, anything lower than that is fine. I still need it tuned to run 15psi. But i'll hit you up when my car is running again, i never noticed when boost kicked it or not, i just floor it and go. I just got a ACT clutch too, my stock one slipped during boost. By the way, i'm running straight downpipe, that makes a world of differance. It's a garret T28, it's also watercooled.

[nissanfanatic]

Why not do someting like this?

It would come out to about the same cost as a new mani and turbo setup, maybe a lil more. BUt you can keep the same mani.lol

[Luderacer14]

Holy cow, it supports up to 400 horsepowers!!! I had no clue, i originally thought they max out at 300. Dang, i'm gonna consider that as one of my other options, just direct bolt on, hhhmmmm.....

[Fenvy]

there are actually 3 conversion of gt2871 but the most popular one that everyone sell is the 400hp one

actually it shoudl be 450hp, plesae review the attachment, that info is copy and pasted from garret's website, look at the last one

zer...1.gif

[Luderacer14]

Thxs for the chart, crap, i had no clue the disco potato was capable of 450 horsepowers with no lag. hahahaha, i'm saving for that now, forget the t3/t4.

[Fenvy]

who said there is no lag?

hell yeah there is lag with gt2871 from what I heard

[Krinkov]

the GT2871 is not the "Disco Potato" that would be the GT2860RS (GT28RS)http://www.atpturbo.com/Mercha...e=GRTthis is rated to 350 crank hp.

USDM side feed 480cc WRX STI injectors will get you to 300whp, I just picked up a set of these for $50 on I-club

[HardcorePS13]

^ as stated above, the T28 would have to be pushed to 17-18 psi to reach 250 whp.. BUt thats when it will start to LOOSE its efficiency... When this happens, it will start to blow HOT air and detonation will become an issue and u DONT want that...

Stock maf will get u to ~250 whp.

555cc inj will get u to ~350 whp..

Stock ignition is good till 400+ whp... been proven.

Get a t3/t4.... better off..!!

A T28 will hit 250whp on a smaller SR engine at 14 PSI. On the KA-T you could hit 250whp at anywhere from 10 - 12 PSI due to how mass flow vs. pressure works in a turbocharger.

The turbocharger would not be in it's peak efficiency in the higher RPM, and it could supply 280whp of flow for the KA24DE.

Also bear in mind that there is another side to the turbocharger. If you want to produce power with a small compressor then you need to go with a larger A/R to reduce the backpressure in the manifold. Moving from a .64 to a .82 even in a T28 sized application will produce about 15 - 20whp more, while maintaining a small spool differential.

[WDRacing]

There are numerous T28 combo's that are cheap and will put out gobs of power. The 2871 for example. Hell the 2835R made a touch under 400 on my buddies RB20.

WD

[HardcorePS13]

There are numerous T28 combo's that are cheap and will put out gobs of power. The 2871 for example. Hell the 2835R made a touch under 400 on my buddies RB20.

WD

Both of those turbos are not T28's. They both have 71mm compressor wheels hence the Garrett turbo's 71 meaning it has a 71mm wheel.

A true T28 is a GT2860R, which is basically what comes factory on the S15.

[WDRacing]

A T28 to me designates the exhaust hosuing size. Trims can all be varied from there. T25/28 being the same of course.

[virus77]

the GT2871 is not the "Disco Potato" that would be the GT2860RS (GT28RS)http://www.atpturbo.com/Mercha...e=GRTthis is rated to 350 crank hp.

USDM side feed 480cc WRX STI injectors will get you to 300whp, I just picked up a set of these for $50 on I-club

deatchwerks flow tested the USDM STI injectors, they were 525cc

You can also consider a GT28R, they support ~300 whp at 17-18 psi and its like 700 for a new one.

[TurboChargedSE-R]

The T28 from a Pulsar GTi-R is good to 300whp in the smaller, FWD SR20DE engines. After that (14-15psi) it is out of its efficiency range.

The Pulsar T28 has a different compressor and turbine than the 'normal' T28s that Garrett makes.

If I were you, I'd do a DP (GT28RS). Great turbo.