Aftermarket turbo

CrookedH · #11 02-08-2010, 07:22 PM

^^^Nice. Always good to know the history of stuff like that.

I'm torn between the GT28rs and upgraded stock. Hoping someone does the upgraded stock and dynos at some point. It'll probably be a year before I look at swapping turbos though so hopefully there will be a bunch of dyno's to compare. I just couldn't deal with myself if I lost that much power down low with the GT30. I know it would pull like crazy up top but that's a big power hit below 5000 and not much more above, IMO.

Kamkaze · #12 02-08-2010, 08:06 PM

Very nice write up!! Never heard that story before.

Quote:

Originally Posted by genjuice

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.

Thought you might enjoy

ragchaos · #13 02-09-2010, 10:27 AM

Quote:

Originally Posted by CrookedH

^^^Nice. Always good to know the history of stuff like that.

I'm torn between the GT28rs and upgraded stock. Hoping someone does the upgraded stock and dynos at some point. It'll probably be a year before I look at swapping turbos though so hopefully there will be a bunch of dyno's to compare. I just couldn't deal with myself if I lost that much power down low with the GT30. I know it would pull like crazy up top but that's a big power hit below 5000 and not much more above, IMO.

Are you gonna chance it and not upgrade your internals before replacing/upgrading the stock turbo? I think a year from now we should have enough data on whether or not we need to upgrade the internals what do you thing( anybody)?

CrookedH · #14 02-09-2010, 10:36 AM

Quote:

Originally Posted by ragchaos

Are you gonna chance it and not upgrade your internals before replacing/upgrading the stock turbo? I think a year from now we should have enough data on whether or not we need to upgrade the internals what do you thing( anybody)?

I'm still not sure about internals before turbo, I'd love to not have to upgrade them... If nobody else blows a stock bottom end between now and new turbo time, I'll be sticking to stock internals. If more stockers blow up then Beyond Redline will be getting some business for me. Swapping the block by myself should be significantly easier than swapping the internals in my own block. Fingers crossed.

GenDiesel · #15 02-09-2010, 11:18 AM

I'm pretty confident that the stock motor can handle between 300-350whp, very few if any failures have been reported at these numbers. I plan to keep stock internals for the time being. IF, I'm hoping that I never need to, am in the need of a new engine, I'll go with a crate motor fully built from BR. Just so I'm not confusing myself with the numbers the GT28rs is "NOT" a GT2871 correct? Does anyone have any numbers or a spool profile on the 2871?

CrookedH · #16 02-09-2010, 11:28 AM

Quote:

Originally Posted by GenDiesel

....Just so I'm not confusing myself with the numbers the GT28rs is "NOT" a GT2871 correct? Does anyone have any numbers or a spool profile on the 2871?

Correct, not the same. Here is a dyno of the two on the sam car, not a GC though.

ragchaos · #17 02-09-2010, 11:37 AM

Quote:

Originally Posted by GenDiesel

I'm pretty confident that the stock motor can handle between 300-350whp, very few if any failures have been reported at these numbers. I plan to keep stock internals for the time being. IF, I'm hoping that I never need to, am in the need of a new engine, I'll go with a crate motor fully built from BR. Just so I'm not confusing myself with the numbers the GT28rs is "NOT" a GT2871 correct? Does anyone have any numbers or a spool profile on the 2871?

Correct, A GT2860Rs has a completely different compressor map than that of a GT2871. It part of the GT28 family but different. A GT2860rs is capable of up 360hp and a 2871R is capable of up to 475( 743347- 4 model #?). Don't know about spool profile's

ragchaos · #18 02-09-2010, 11:41 AM

Quote:

Originally Posted by CrookedH

Correct, not the same. Here is a dyno of the two on the sam car, not a GC though.

See this doesn't look like what i want either, like genjuice said in another post the gt28rs and the gt2871r hit spool ~1000 RPMS later compared to stock. You might as well go with a GT30. IMO. I want a turbo that can spool somewhere between 3000-3250 RPM.

GenDiesel · #19 02-09-2010, 02:10 PM

I think I remember reading somewhere that the GC has "full" boost by 2600rpm so it starts spooling much sooner. So with a 2871 will I get full boost by 3600? If so, I can deal with that as long as the motor isn't completely anemic.

Split · #20 02-09-2010, 05:04 PM

Remember there are a lot of things that contribute to spool time besides just which turbo you pick...
food for thought.

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