is a garret t3 super60 a good turbo?? s2 rb25det

[jrb92se]

http://cheapturbo.stores.yahoo.net/gat3su.html i just want to get some basic info and opinions of it, also some other recommendations for a turbo. im looking for an internally waste gated, reliable mild upgrade over stock i dont need anymore then 325whp and would like to retain as much of my current set up as possible to keep cost low without sacrificing reliability. i already have a fmic,3 inch exhaust, apexi pfc, clutch, boost cont., etc. i will need a new hot pipe,down pipe,coolant/oil lines,intake/maf tubing and maybe injectors. i am also trying to use the stock manifolds, bov and maf. give me some suggestions any constructive input will be greatly appreciated.

[lucky7]

i am looking to do the same thing. theres some good ideas in here.zerothread/291429

[uber95]

You're in Florida correct? Call Charlie at Evergreen Turbo, he's in Florida also. (800)275-2531. He's been my turbo go to guy for nearly 20 years (no old guy comments!! )
Modified by uber95 at 4:25 AM 11/11/2007

[jrb92se]

thanks for the help!!thats funny becasue i had a holset turbo over a year ago when i was gonna turbo my ka24 in my s14 and i sold it
Modified by jrb92se at 8:54 AM 11/11/2007

[jrb92se]

would i absolutely need injectors if i switched to a gt30 ? is a t3/t4 too small for the rb25? is there an internally waste gated garrett ball bearing turbo that will be good for the rb with stock injectors?

[mello88]

T3 Super 60 is way undersized for a RB25. If you take a look at the compressor map you'll see this. Should work nicely on a RB20 on low boost though.

"T3/T4" means nothing, that just describes a turbo that has a T3 turbine and a T4 compressor. What really matters are the compressor A/R, turbine housing A/R, and compressor/turbine trims. That said, a properly sized t3t4 should work fine on an RB25, take a look at the flow map for the 60 trim .86 A/R.

You don't absolutely need to replace your injectors on a GT30 running low boost. But it's suggested anytime you want to add some power/bigger turbo. For one thing with properly sized injectors you'll be able to add more boost later on and keep your injector duty cycle down. On 6 cyl engine you can estimate injector power capacity as 1hp per injector CC.. Stock RB25 has 370cc injectors which means you can get up to 350ish crank hp before you're maxxing them out. When you do your turbo upgrade you'll probably want to up your injectors and have some kind of fuel and spark tuning device (PowerFC, standalone, Rom tune, etc) to compensate.

What rpm range do you want to make your power in? What kind of driving will you be doing? This will help you decide compressor trim and turbine housing A/R.

Here's a few links to get you started... Also buy Corky Bell's "Maximum Boost" book though, you'll enjoy it and become a lot more knowledgeable about turbo systems and sizing turbos.

http://www.enginelogics.com/cmaps.htmlh ... .c....html

GL hope this gets you on the right path sorry if it's just a rehash.

[jrb92se]

thanks man, i guess what im looking for is similar performance to the stock turbo with peak boost around 2500rpm my car is a daily driver but i race people sometimes when i thinks its safe and worth while, which is hardly ever (i know its not cool; but sometimes you just gotta race). i dont really want that much more power, just to get over 300whp. ive been reading some stuff about it on here and other sites but to be honest i dont know how to read a compressor map or know what the trim or ar # means on a turbo its like chinese to me i just assumed higher numbers ment bigger turbo. your saying t3/t4 60 trim ar .86 is a good option for the rb25det? i guess i will get some 450cc injectors. will i need to change the mafs because of the airflow will increase with the larger turbo? i already have an apexi pfc for engine mnagment
Modified by jrb92se at 9:18 AM 11/12/2007

[jrb92se]

also i see these hks gt25/28/30rs turbos alot and alot of the skyaus guys are using them are they direct bolt ons to the rb or do you have to get a manifold

[l0nestar]

I have been researching Holset turbos recently.

I just found this - wonderful.

http://www.squirrelpf.com/turbocalc/index.php

[jrb92se]

that thing is pretty cool!!! i think i understand how to read a compressor map now and according to that calculator and according to that calculator the best trubos would be a gt28 or gt3071 and that holsets are inefficient at low rpm/speeds. mitsu tdo6 17c from a gmc syclone or a td05 16g6 (i can get one of those free its from an evo mr!!) look pretty good.
Modified by jrb92se at 1:03 AM 11/13/2007

[Sky80]

Wow, nice find lonestar!

I hate having to go through and do all that work myself, I made an excel spreadsheet to help, but still that thing takes half the time!

[l0nestar]

Dang, I must have made the reply in another thread..

*Disclaimer*I ran some numbers through it while talking to Carl H, and we are not 100% sure of it's accuracy...

Again, use this is a reference, and do not base your turbo selection solely on one single tool..

But yeah, it is pretty sweet Helps to understand reading maps. I wish there was an option to not auto plot, to see what differences make.

[jrb92se]

i just corrected hp and displacemnt i did change all the vol eff, air temp or any of that stuff so i dont know if it is correct. but aside from that ive been excanging emails with the owner of xat and he gave me two basic options to get a new turbo the first is :

Option 1:

Ideally a GT30R is the way to go…

http://www.atpturbo.com/Mercha...e=GRT



with 550cc or larger injectors, good for 450 rwhp

Turbo $1350

Lines, oil restrictor

Internal WG and bracket upgrade

Fab hotpipe & downpipe

Install turbo, lines, wastegate, etc

Re-tune PFC total= 3000+-

Option 2:

Standard Garrett T3/T04E (550cc or larger injectors, good for 380 rwhp)

Turbo http://www.atpturbo.com/Mercha...e=TBN

Lines

Tial 38mm external wastegate

Ebay tubular manifold (http://cgi.ebay.com/ebaymotors/Nissan-R ... dZViewItem )

Fab dp + hotpipe

Install turbo, lines, wastegate, etc Re-tune PFC

Total = 2500+-

im debating on which would be best for me, he recommended op 2 (it would be easier to upgrade in the future) if i went with option 1 i would change manifolds and go external w/g because he says that internal w/g's on big turbo are more likely to have boost spikes then an external w/g. i dont want to lose to much spool up, so the ball bearing gt sounds better but is much more exspensive then the t3/t4, and if i were to go with the t3/t4 i would want to get the correct trim and ar for maximum efficiency* (spelling) and i dont really know what would be best. also his price qoutes include labor; if i did everything but the fab work and the tune, it would be cheaper. what would be the most reliable for daily driving? i think im going to go with op 2 but with a gt3071r.

[fkatzenb]

Dang, I must have made the reply in another thread..

*Disclaimer*I ran some numbers through it while talking to Carl H, and we are not 100% sure of it's accuracy...

Again, use this is a reference, and do not base your turbo selection solely on one single tool..

But yeah, it is pretty sweet Helps to understand reading maps. I wish there was an option to not auto plot, to see what differences make.

Let me know what you think isn't so I can either correct it or clarify... I love turbo topics.

FrankSquirrel Performance

[BoostFab]

thanks for the help!!thats funny becasue i had a holset turbo over a year ago when i was gonna turbo my ka24 in my s14 and i sold it

some information from another site:The Holset HX35 is basically equivalent to a GT35 without the ball bearing center section. The comp wheel is a bit smaller then the normal 61mm wheel but roughly as efficent as the exducer sizes are similar. The exhaust wheels are also similar in size. The Holset HX35 12cm housing is roughly equivalent to somewhere between a .63 and .82 Garrett T3 exhaust housing. Spool is a lot like a T3/T4 with a Stg5 turbine wheel and the .63 housing though, with much more top end due to the bigger wheel.

The HX40 is a lot like a GT4088, uses the same wheel as the 61mm inducer GT55 (GT35R). Turbines are similar in size as well, and the HX40 steps up to a T4 inlet size just like the GT40's do.

i think the hx40 will screams on the rb25; i'm looking into getting one for mine.