Jump to content
SAU Community

Recommended Posts

After a long a tiring read through that never ended RB30 thread up top, I thought I'd ask my questions directly as I have heard there are a few knowledgable people on this board when it comes to RB's and turbos.

I have an RB30DET freshly rebuilt using standard internals and 8.3:1 compression.

I hope to acheive 250rwkw at 15psi or below as well as have a streetable responsive car i.e. not too much of a laggy feel.

Am i asking too much?

At the moment I am choosing a turbo and the GT30 with the 0.82 exhaust A/R seems to be the go.

The motor is not going in a skyline though, rather a 1000kg or less 260Z so there are some concerns that the 0.82 will come on boost too violently for the light chassis. This has lead a few people to suggest the 1.06 exhaust AR.

Having spent more than a lot of new cars these days on this project and not really being close to finished, I am trying to kerb my spending and am playing with the idea of running an internal gate and using the standard exhaust manifold. With this in mind I have seen a mock up of the XR6 turbo for sale.

This is a GT3540 running and enlarged internal wastegate in a 1.06 AR exhaust housing. Will this be too big for my application and will the internal gate really hamper things too much?

Thanks guys

Link to comment
https://www.sau.com.au/forums/topic/39608-rb30det-turbo-choices/
Share on other sites

  • Replies 96
  • Created
  • Last Reply

Top Posters In This Topic

.82 is too small small for a VL, yet for a 260z! :rant:

last 2 VLs i have put GT35/40s on with .82, ended up changing to a 1.06 with 1 month of road driving.

.82 are fun, but boost comes on too hard to quick. (again this comes down to the application of the car, .82 would be good for circuit work.)

Steve,

The GT35R, R = Rebuildable/Repairable??

Theres no diffrence between a GT35 or a GT35R it terms of size. (both have same size compressor & Exhaust housing,/ can have same size housings fitted .63, .82, 1.06.)

Heres the confusing part:

The GT35R's flow 50lbs/ as per GCGs website (www.gcg.com.au) and are rated @ 700HP

BUT the GT35's flow 60lbs/ as per HPIAB (www.http://www.horsepowerinabox.com/HPIAB2/prod34.htm) and are rated @ 600HP

Whats the 100HP & $655.50 diffrence between these turbos? trim sizes? core?

(sorry about the hijack)

Cheers,

Trev

Guest INASNT
Nice information

Any opinions on internal gates?

calaisturbo.com has a few threads similar to this with only one epxerienced opinion also leaning toward 1.06 ex AR.

What about GT30 vs GT3540 arguments?

Dude y have u gone with an internal wastegate with your setup???

A nice turbo like that needs a nice 45mm external gate to get the full potential out of it.

Hye Trev,

The 'R' just means ball bearing in garretts definition... The lack of an 'R' is more than likely just lazyness rather than anything significant.

Dont go by GCG's site. Check out ray halls site he a more comprehensive specs page.

also the 700hp rating is for the top spec GT35R.. ie the 1.06 exh housing

hi dave!

got a suprise for you coming soon... :P (Check screenie below)

I thought "GT" was Garrets definition of a Ball Bearing unit. e.g

GT35R = Ball bearing Garret, Repairable

T04R= Bush Bearing, Repairable

Someone has to know, i checked Rays site but i couldnt find GT specs...

Cheers,

Trev

hi dave!

got a suprise for you coming soon...  :P    (Check screenie below)

I thought "GT" was Garrets definition of a Ball Bearing unit. e.g

GT35R = Ball bearing Garret, Repairable

T04R=  Bush Bearing, Repairable

Someone has to know, i checked Rays site but i couldnt find GT specs...

Cheers,

Trev

Woops forgot to attach screenie:

Ok copy from Ray Halls site:

Order is:

Model: Part#: CHRA#: AR: Trim: Model: diam: HP: lbs flow: AR: Trim: diam

GT35 714568-0001 706451-0005 0.70 56 GT40 2.41/3.22 700 60 1.06 84 2.45/2.68 

GT35 714568-0002 706451-0005 0.70 56 GT40 2.41/3.22 620 60 0.83 84 2.45/2.68 

GT35 714568-0003 706451-0005 0.70 56 GT40 2.41/3.22 550 60 0.63 84 2.45/2.68

Pretty decent listing there

GT35 = GT35

GT35R = GT3540 as far as i know.

There is a lot of bad feeling towards going internally gated, what is the reason?

Another question and probably the most important is when these larger GT's make full boost and how suddenly?

please just open the garrett catalogue and look at the damn definitions :P

The "R" Denotes the 'rolling' element found in garrett single cartridge, dual ball bearing hi performance turbos.

GT35/40 is another naming convention made up by suppliers which has been discussed in the R33 RB30 conversion thread... Why bother arguing, just look up the catalogue and match it to what you are buying.

Internal gate is 'bad' as it wont be as effective at controlling boost as an external larger diameter wastegate would be... Sure you could do it if you really wanted to, but you would benefit from using these turbos the way they are meant to be run.. with custom manifolds and external wastegates

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
    • My experience with Rising Sun Exports Before agreeing to the sale I tried to do as much research as I could (obviously), his Facebook reviews are 98% and he goes Live at least once or twice a week. I contacted 2 people in the UK who had used him for their imports, both had positive feedback. His explanation and talk through of the import process was thorough, answering any query no matter how stupid it was. It felt as soon as the money was sent, communication dropped off. I asked for shipping updates every 2 weeks or so, not wanting to pester him, he never had any updates. I wasn't informed the car had been dropped off at the port, I only found out by his Facebook story. I asked for the photos taken at the port, knowing he would need some for insurance purposes. I received a few 5 second clips and that's it. When asked again, he said his staff had them. Weeks later I asked again, he tells me he doesn't have any, but does have 50 photos from the original advert. I never received them. I eventually got the documents sent via WhatsApp after I mentioned the port was requesting them. I purchased a CarVX report, to find out the vehicle is a Grade R with recorded accident damage, first recorded in 2017 when it was first auctioned. He never told me the grade, then again I didn't ask. His response was "Grade R means nothing, it wasn't chassis damage". Still, I would have liked to have been informed about it. Jon prides himself on being open and honest when it comes to inspecting cars, it's his main job doing so at the auctions for customers. When the vehicle arrived in the UK I noticed a few little cosmetic issues. It's a 21 year old car so it wasn't going to be mint condition. The side skirts are cracked on each corner and the sealant is failing. The front grill on the bonnet/hood isn't secured very well, mounting studs are missing. Both minor things, but again, it would have been nice to be told. During a Facebook Live walk around video of the vehicle, he mentioned it has a front Whiteline anti roll bar/sway bar. While on the inspection ramp, I noticed the stock item has been installed. When first questioned, his response was "the ARB? Switched? Since when, it never had them". Since sending video and photo evidence I've not received a response. I'm probably being over critical of the overall condition of an old car, but all I wanted was honesty (which he claims to have). I'm aware I wasn't his only customer, he's busy doing XYZ but other reviews praise him for great communication with regular updates and photos, I felt I didn't receive the same treatment. 
    • I was able to get some underside photos while the car was on the ramp The suspension is all Altezza/IS200/IS300 so getting part's will hopefully be less of a headache
    • Welcome to my 2004 Toyota Mark ii IR-V Fortuna (series 2) With a 1JZ-GTE powerplant under the bonnet (hood) it'll give me plenty of scope for power upgrades. For those who aren't familiar with imports, the 1JZ-GTE is a 2.5L 6 cylinder VVTi engine with a single turbocharger. This has the factory R154 5 speed gearbox, along with a aftermarket 2 way LSD differential (brand unknown). Under the arches are a set of CST Zero 1 alloys, 18x9 +30 225/40 up front and 18x9.5 +15 265/35 on the rear. The car was quite low in Japan and there's evidence of the wheels catching the rolled arches/fenders. The tyre's aren't great so I'm in two minds whether to replace both or just the tyres and put up with the wider wheels on the rear. The car still uses stock brakes with the addition of some braided hoses. The exterior is stock with the exception of a BN Sports front bumper and a replacement Fortuna grill  Moving to the interior, the steering wheel has been replaced with a dished MOMO steering wheel (which will get swapped for my Momo Tuner for the time being) Defi Link Gauges are mounted above the climate controls and on the A pillar, the Oil Temp,Oil Pressure,Water Temp and Boost gauges should help with spirited and track driving  The stock seats have been replaced with some retrimmed Recaro bucket seats. Being a larger build these are a little snug, unfortunately the orange isn't for me so I'll look into replacing these down the line. Other modifications include a twin plate clutch, Blitz intercooler, Evolve alloy radiator, a stainless exhaust with decat, HKS EVC-S boost controller and coil overs
×
×
  • Create New...