rb30 turbo ideas?

[Goodlucks7even]

I would go with the PTE 6266. Fast spool, in the HP range you want.

[magular]

goodlucks7even

thats the turbo ive been focused on getting, the rep ive been talking to said get t3 flange with .82 a/r.

what a/r should i get for a t4 flange? i cant seem to find manifolds that make t3 flanges. so t4 it is i guess. and ill look at the other turbos that were recommended, thank you.

[Super_Dude]

Absolutely.

And to the response factor, it's overrated. Every buildup i have ever read about (at least a hundred) the guys who say that their engine was built for response are only spooling about 500 to 1000 rpm before me. Lame. The other reason i think its overrated is in daily driving. You dont want your turbo spooling every time you want to climb a small hill or overtake a slower car for a lane change.....your gas mileage will suck. I get 20 mpg average and make more power than a ZR1 with a pulley, headers, cam and a tune ( conciderably more). My usefull rpm range is 4500 to 8500, wide enough to be an effective road course weapon.

And that is a T88H-34D on only 2600cc, a T78-33D on a 26/30 combo would be a freaking torque monster.


Jon.

Wow, first off response isn't over rated.clearly you have not been road racing on your setup. I was running a gt4088r on my 2.6 and was constantly trying to keep it in the power band and control it coming out of corners. It wasn't hard to control because of the power but because of the throttle response. That's why I'm running a rb30 and a efr8374 now. you need power band and response.

Also, boost has a extremely minor effect on fuel economy. If your accelerating or cruising at the same rate with same weight car then you need the same amount of horsepower. Horsepower=airflow. A small turbo might take a couple psi up a hill to reach that lb/m and a big turbo wont but they still move the same amount of air. If the cars are tuned properly both cars would spray the same amount of fuel and thus, same fuel economy.

The only SLIGHT difference would be a little higher intake air temps. that shouldn't account for much of a difference though.

[Goodlucks7even]

PTE's PT6266 Turbocharger features the following:
• Exclusive CEA (Competition Engineered Aerodynamics) compressor wheel machined from a 2618-aluminum forging
• Higher efficiency and faster transient response for maximum power and performance
• 62mm inducer compressor wheel
• Compressor cover options:
- "E" compressor cover 3.0" inlet/2.0" outlet
- "S" compressor cover 4.0" inlet/2.5" outlet
- "Ported S" compressor cover 4.0" inlet/2.5" outlet
• Exclusive CEA (Competition Engineered Aerodynamics) 66mm, 76 trim turbine wheel
• Turbine housing options:
- T3 .63 or .82 A/R with 4 bolt (2.5") discharge
- T3 .63 A/R with 5 bolt discharge (with or without wastegate hole)
- T3 .63 or .82 A/R with 3" V-Band discharge
- V-Band inlet .82 A/R with V-Band discharge
- T4 Tangential .58, .68, .81, or .96 A/R with 3 5/8" V-Band discharge
- T4 Divided .84, 1.0, 1.15, or 1.32 A/R with 3 5/8" V-Band discharge
- Buick .63 or .85 A/R
- GMC Syclone/Typhoon .85 A/R
• Available with either a Hydrodynamic 360° thrust bearing system, or an Air-cooled, dual ceramic ball-bearing center housing rotating assembly (CHRA)

Precision customers have a history of setting records and getting noticed. They don't sit in the stands watching the action – they're the ones making it happen. Innovation is a collaborative process and we focus our efforts on you. Get involved and be a part of the action today with PTE.

The T4 flange should be available. I'd get a T4 divided 1.15 A/R 3 5/8 Vband. Ball bearing with a twin scroll dual waste gates manifold. Now THAT would be response AND power band.

If I would swap to single :

http://www.precisionturbo.net/Street...PT6266-CEA/479

http://www.full-race.com/store/turbo...-manifold.html

[magular]

can anyone explain what v band is? and for the t4 i was told to get like .64 a/r. the shop said if i get a bigger flanger, then get smaller a/r. not sure.

all stuff i dont really know what it means, and ive read many websites but stuff very unclear on the specifics of what i should get. ( a/r i mean )

and i wont be getting ball bearing. journal will be just fine. ill only need about 18 psi.

but i like the messages, keep the info coming.

[Goodlucks7even]

V band :


Standart T4 flange :


A Vband is a type of flange, rather than using a standart t3/t4 flange it needs collars :



Ball bearing will improve response. I highly recommend it, it will make nasty power at crazy low RPM on an RB30

[magular]

man, i gotta be honest, im getting pretty damn excited about this build.

but im pretty sure it will bite me in the rear once i figure out the total cost.

sounds worth it.

[Dragon Humper]

Wow, first off response isn't over rated. Clearly you have not been road racing on your setup. I was running a gt4088r on my 2.6 and was constantly trying to keep it in the power band and control it coming out of corners. It wasn't hard to control because of the power but because of the throttle response. That's why I'm running a rb30 and a efr8374 now. You need power band and response.

Also, boost has a extremely minor effect on fuel economy. If your accelerating or cruising at the same rate with same weight car then you need the same amount of horsepower. Horsepower=airflow. A small turbo might take a couple psi up a hill to reach that lb/m and a big turbo wont but they still move the same amount of air. If the cars are tuned properly both cars would spray the same amount of fuel and thus, same fuel economy.

The only SLIGHT difference would be a little higher intake air temps. that shouldn't account for much of a difference though

Sigh........

I thought my motorsports reference would bring out one of you guys. Clearly YOU missed the point and lost the idea that this is a street car and not a pure competition car. If you like the way your car responds with the smaller turbo....bully for you. I have no issues what so ever with the response of my car. I have tuned out the light switch transition with about 8 hours of fiddling with the J-Land tune. I also have a MAP based ECU which from what I understand isn't as herky jerky as a pure MAF system in transitioning and peddling the power out. My car feels just like the 427LS powered Factory Five Cobra I drove 3 years ago. And yes, I have tracked my car, I like it just fine thank you.

[major edit]

Blah......forget it, I had a whole thing about the fuel economy end of it but that's not the point of this thread.

The FACT is you will get worse gas mileage if you are in boost earlier on a daily driven car.

That said, I guarantee you that you will like a larger than you think turbo if it is tuned correctly with a custom tune and not some "canned tune" from some lazy tuner. Unfortunatly that costs money if you aren't doing it yourself. You can expect at least 4 to 6 hours for a quality tune that covers all aspects of your day to day driving.

Jon.

[ST240]

I ran a PT6262 last summer (~GT35R) .58 a/r. It choked up top pretty good, but it was very responsive, and my tune was the absolute shits. Trying .84 divided and rb26 head this summer. I would imagine a 6266 would be an awesome combo.

Yes its a 3.0 L. But its still only a 3.0 L. Anything bigger than a T04Z or GT40 will be a lag monster. Just because you run your massive turbo at a lower power goal doesn't make it any more responsive. Response = win imho.

[FOOT]

Wow is everyone scared of a big turbo geez. Been in a 3.0L (2jz) car with a T6 80mm TH400 and its not that bad. If I was building a Rb30/26 the smallest turbo would be a toss up between a 67mm or 72mm. It all depends on what you want to do with the car.

[Dragon Humper]

ST240

Yes its a 3.0 L. But its still only a 3.0 L. Anything bigger than a T04Z or GT40 will be a lag monster. Just because you run your massive turbo at a lower power goal doesn't make it any more responsive. Response = win imho.


See, this is the thing I don't get, response for what? And what is concidered a lagmonster, I start to build boost at 3500 and am fully in at 4500. As long as you don't let the revs get below 4000 you are in for the ride of your life. I have lost count of the cars that make an honest 600hp and are touted as an "ultimate response machine" and only make full boost at 3700 to 4000rpm, big fat swinging hairy deal.

Ultimate response is great for a Ghimkanna (sp?) car where things are super tight and you want full boost at 2000rpm, but for a street car that only races once in a blue moon it can get annoying. Been there, done that. If all you want to do is cruise most of the time, running 550 to 600 deg.C EGTs are just hard on stuff (that's with a crisp tune so that you don't get 10mpg all time). If you want that, a set of steel wheeled stockers will give you a low and mid range torque monster (about 500lb/ft) that will blow the tires right off everytime you even touch the gas. And still make an easy 500hp. N1s will give you 600hp.


I think you have more than enough info to make a choice magular, hope to hook up with you on the Okanagan cruise this spring.



Jon.

[ST240]

You make good points but I personally like boost by 3500, so i guess it is a matter of preference. I'm also running a stock bottom end so I'm not spinning it above 6500-7000.

Guys on SAU with GT3076r and 1.06 TS, make north of 400 whp and the dyno charts look like they came from an NA V8! That looks fun . That would be the limit for that turbo though.

[Dragon Humper]

And thats one of my biggest points, I make about 3-4 #'s of boost at 3500 rpm, but because my turbo is so big I am making about 300hp a that pressure. At 7 #'s Iam making about 450hp (crank). I can run toe to toe with a Viper at only 10 #'s.

All the while the turbo is just barely starting to wake up and the egt's are only about 500 deg.C. The only time my egt's get even remotely hot is when I push it to 24#'s, then 800hp is getting really close.


My main point is though, the tune. You can tune out a hell of alot of lag if you want to spend the time. T88 on a 2.6l was my learning curve, yours won't be as steep.


Jon.

[magular]

first off thank you for all the chatter and discussion, im happy that this thread is still alive, and its true, preference is for sure what it comes down to because building a whole car is how the owner wants it, and in my life i copy other peoples styles in lets say music, or clothes or sports even, but this car, im noticing more and more then i finally get to be me and create what i want it to be like, but i dont know that much yet that i need some guide lines to go off of, so thanks to you guys its great having those.

and Jon you know youll see me there! hoping to have my car at its best so far since ive had for the cruise. but much much more is to come. and i work full time and i say im always broke, but all the money goes in the car, or more so paying off the car right now, im sooo close to owning it i cant wait because then the real projects can start when i have some funding. tired of having the bank on my back.

but umm i mean, i do want response more then anything else, from what i personally think id like in my car, ive driven different cars, and driven my buddys cars before and after they turbo swaps and trying to get a feel if i really care waiting that little big of lag time till it kicks in, and just driving my rb20 that doesnt run so well, ( fuel cut out sometimes, randomly dies, idles shaky) and from being tired of my 20 taking a second before it pulls annoys me, maybe im being to picky, but if im spending thousands of dollars, i want to spend it in a way that is closest to what id like.

and i do think with all this info im pretty damn confident with my choice, and i have also figured out my flange ( t3 and a/r of .82? i think ) and im getting the exhaust manifold custom built, having the 30 which is taller has caused some fitting issues, and i know the 6266 isnt anywhere near as big as a t88 but having the manifold built perfectly for my set up everything will line up beautifully.

and the t3 will spool just great with the turbo size, will be quick, and i know jon you say you got tired of having your car boosting so early for daily, but in town everywhere is only 60 km/hr tops. couple back roads 70-80. so i shift at 2700-3000 rpm always, kuz thats how the traffic goes, so i dont have much time to wait for the turbo to kick in if i need to fit into a tight spot, i want the power NOW ahah. so hopefully with a 3L beast and a fairly small turbo ( well proportioned for my needs ) it should be great.

this is long down the road, ill have to start a build thread or something.

anyways ill shut up now, seems i cant stop typing even when my eyes hurt from this damn screen.

goodnight all. i appreciate all the skyline enthusiasts giving me a hand. should be a bad ass 4 door. (someday....)

[Dragon Humper]

Right on man, we also have much more in the way of climbing hills in Kamloops to get around town. Kelowna, not so much.

An RB30 with a smallish turbo on it will be like a Nova with a 496 stroker in it........a whole hell of alot of fun.....and tire smoke.........



Jon.