Today I decided to find the perfect turbo for those that dont have the option of changing the powerband on their engine .So from that I searched for turbos that spooled like stock yet held 20 psi till 6500 rpm.
I came up with two, first one is the stock upgrade with a 19t compressor, second one was the gt28rs with a 62 trim.They are virtually identical in everyway.
Heres the kicker, both will flow 24 psi up until 5700 rpm with the same 70 plus efficiency,at that point you would have to taper down to 20 psi till redline to keep the same efficiency.
For you power axel guys you would have to taper down to 15 psi to keep the same efficiency at 7400 rpm.

Thanks for the info. You think the gt28rs is what ATP is using for their "350hp bolt on upgrade" for the 2.0T?

see the Gt28rs might be the one that ATP uses but i was looking for something with a little more kick but not to strong like the GT3071R but there second option which is the GT2871R that fits my needs perfectly my original goal was to be somewhere in the 350ish to 400ish rwhp. The Gt28rs is kinda pointless in my eyes if people can just upgrade to a 19t compressor at half the price.

MMMMMM still looking into option but i will take you advice well. It will be a while before i even attempt to buy a new turbo/ attempt to upgrade the stock turbo.

Im fixing to upgrade the stocker in april and i was thiking about just getting the ATP bolt on

after looking over Atp dyno charts...the Gt3071r only outshines the Gt28rs (Atp Bolt on) at 5.3k and above and makes its peak power at redline...which means that you have to rev the piss out of it to make its max power (7k rpms at this point). There are losses all over the powerband below the 5.3k rpm threshold with the gt3071r vs the gt28rs

the gt28rs makes considerably more power & torque than the 3071r from 2krps-5.3k (peaks at ~6k)..and from this point on the 3071r outshines the gt28rs & kills it quickly

and to also make a point...the difference btwn the 2 turbos in the 1/4th mile is only .3 sec

the Gt28rs hit it in 12.9 with all seasons & lsd
the gt3071r hit it in 12.6 with all seasons & lsd


12.9 is faster than the camaro, 370z, g37 & mustang with sport tires and LSD..they are all in the mid 13 range.
im sure if you can get some sticker track tires on the gen you can shave ~.2-.3secs off that time

so It really all depends on do you want to make peak power at redline or if you want it down low where its usuable

heres the dynos and they are all on stock internals & manifolds too

Gt28rs



Gt3071r




I'd say the bolt on is where its at for me...very very yummy powerband..id say its probably the perfect turbo imo for dd & track duty.

or perhaps i want my car to keep pulling until it redlines?!?

hmmmm

The Legend of the Disco Potato Turbo

The story starts with Dan Passe who, at the time, was a Nissan PR genius with a penchant for bending rules. He conveniently "lost" the paperwork for a 1.8-liter Sentra which Nissan Design International had modified for the L.A. Auto Show. The car quietly landed in the hands of Nissan engineers Steve Mitchell and Mike Kojima.

Meanwhile, a few miles away at Garrett, turbo engineer Jay Kavanagh wanted to boost his Miata. Having full access to the newest Garrett technology, he concocted a physically small turbo with a ball-bearing center section and internal aerodynamics 20 years more modern than the T3/T4 standard the aftermarket is used to.

A few cubicles from Kavanagh, Rob Cadle, a good friend of Mitchell and Kojima, realized Kavanagh's Miata turbo would be perfect for the SR20DET the Nissan boys were planning for the Sentra. He brewed up a turbo, stuffed it under his shirt, and went out the back door.

The Sentra was painted a unique combination of psychedelic, color-shifting brownish paint and was thus dubbed the Disco Potato.

Jim Wolf Technology built a very mild SR20 for the Sentra, making it functionally equivalent to a stock Japanese-spec SR20DET. The turbo was installed, and amazing things started happening. The car's power was impressive, 280 hp at the wheels, but not earth-shattering. The driving experience however, was. Throttle response was excellent, turbo lag virtually non-existent, and the tire-shredding power was easily modulated. The turbo spooled up early, making so much torque, that the best quarter-mile time (13.7 at 104.5 mph) was achieved launching in second gear.

Mitchell brought the Disco Potato to the Ultimate Street Car Challenge in 2001, and placed an impressive fourth overall. The rest of the time, the car was stashed away in Nissan USA's service garage and used strategically as an attitude adjustment tool. Whenever Nissan or Garret executives needed an injection of gasoline in their veins, they were offered the keys. They would inevitably come back grinning from ear to ear and breathing heavily, eager to bring horsepower to the masses.

During one such outing, which included a 1,000-mile road trip as well as a track day at Thunderhill Raceway, the fwd Disco Potato outran every car at the track and then blasted down the freeway at 140 mph.

Several Garrett executives also experienced the Potato. They were so impressed, they decided to produce the turbo, double the engineering staff in the aftermarket department, and start applying this modern Garrett technology to a whole range of aftermarket turbos.

Technically, this is a GT28R with a 62 trim compressor (.60 A/R) and a 76 trim turbine (.86 A/R) and was voted one of the top 20 New Products at SEMA 2003.


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