Jump to content
SAU Community

Recommended Posts

Recently there have been a couple of threads discussing the adaptation of a VG30 exh. housing to a hi-flowed rb25 turbo. I have completed such an upgrade and would like to compare my results with others. I am more interested in the response of your setup for this type of turbo, but power comparisons (all though limited) are also appreciated.

So please copy the fields below, past them in a post and edit as required:

(NOTE: Required support mods/systems are assumed to be fitted to the car.)

ENGINE: RB25det, R33 S1

- Std. plenum

- Tomei Poncams (256 Duration, 8.5mm Lift)

- Head "race" ported

- Std. exhaust manifold, but has been ported/hi-flowed

- IN (VVT still active) and EX cam gears. IN set to 0deg, EX set to -2deg

- STANDARD BOTTOM END :P

ECU: Wolf 3D Ver4+

Exhaust: 3" with cat, long "hotdog" and hi-flow muffler.

RESULTS: 270rwkw@15psi

post-1811-1132730754.jpgpost-1811-1132732720.jpgpost-1811-1132732847.jpg

270rwkw was acheived quite easily but due to the std. bottom end, boost was reduced, to acheive about 255rwkw, and tunning then continued. Hopefully this set-up will last approx 12 months, then the bottom end will be treated to forgies and this combination's true potential will be explored. With forgies i plan to run about 20psi, experiment with both IN and EX cam gears, and have alot more runs to achieve a better tune.

  • Replies 92
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

al i know this might be a bit off topic to your thread but i just installed a wolf on my r33 s1, now looking to upgrade the turbo, wondering where you sourced this turbo from and how it compares to a standard hi-flow?

thanks mate if you dont clog up this thread PM me.

al i know this might be a bit off topic to your thread but i just installed a wolf on my r33 s1, now looking to upgrade the turbo, wondering where you sourced this turbo from and how it compares to a standard hi-flow?  

thanks mate if you dont clog up this thread PM me.

Get your std rb25 turbo hi-flowed, either by ATP (Vic) or GCG (NSW), mine still has the roller-bearing core. The hard part is finding the correct VG30 turbo. It has to come from an early model, single turbo'ed, 300ZX, as this will bolt straight on like factory, but has the larger A/R rating. Your best bet is to ask ATP or GCG to source it for you, as they have better contacts.

I bought my hi-flowed rb25 turbo second hand; Paid $900, which included a aftermarket dump/front pipe. This made about 235rwkw, without cams or porting, but due to the small std rb25 exhaust housing and roller-bearing core, it fluttered (compressor surged) at light throttle. I rang ATP and they found the correct VG30 exh housing. I was charged $500 for the housing, machining and fitting. So the whole turbo combo costed me $1400 :P.

I am absolutely stoked with the result, even my mechanic was grinning from ear-to-ear.

Best part; Turbo still looks factory! :D

post-1811-1132736359.jpgpost-1811-1132736440.jpgpost-1811-1132736472.jpg

Excellent result, but It looks a little laggy.

So its a Standard RB25 turbo, highflowed with a VG30 rear?

I've got a GT30r with a VG30 rear end. Goes for a tune monday morning.

Will definately let everyone know the results.

That's why i want to compare results with ppl that have the same turbo.

On the road it is absolutely great, but during the SAU VIC's motokahna day, the lag was felt.

Also on other threads, ppl have mentioned that after adding the VG30 exh. housing, the setup was not much laggier. But all my headwork and VG30 upgrade mods were done at the same time, so i am not sure if the setup should be this laggy.

Definitely a little laggy.

15 psi by 4810rpm.

Others have stated the GCG/VG30 setup is pretty much all in by 4000rpm. However the VG30 turbine housings used there was the later model Cima/Leopard VG30DET, this VG30 turbine housing also happens to be the same as the R34 GTT turbine housing.

What boost controller?

Edited by Cubes
That's why i want to compare results with ppl that have the same turbo.

On the road it is absolutely great, but during the SAU VIC's motokahna day, the lag was felt.

Also on other threads, ppl have mentioned that after adding the VG30 exh. housing, the setup was not much laggier.  But all my headwork and VG30 upgrade mods were done at the same time, so i am not sure if the setup should be this laggy.

the gcg/vg30 is definately laggier than the normal gcg highflow. i'm getting 18psi in 3800rpm & 20psi in 4100rpm, whereas the normal gcg highflow 18psi in 3400rpm.

The Wolf3D controls boost, using the factory soleniod and actuator. We are going to be playing with actuators and also other components, mechanic is fairly confident that he could get it spooling faster.

  • 1 year later...

Zoom - Are you stilll around?

I just got my VG30 highflow BB and it isn't too bad on lag, but quite a lot less responsive to stock. I haven't had a tune yet so all the AFR's could be out the window, since I have fitted a Z32 afm and just made some corrections.

Zoom - Did you get a bit more response from your VG30 highflow after tuning? Or was the difference still about 400-500rpm.

It builds boost a lot slower now. You have to be above 3000rpm to get some decent acceleration now. Whereas before from just over 2500rpm in 2nd would be fun.

It has an awesome top end, though Im still only running 9-10psi. Can't wait for injectors and tune..hopefully running about 17psi.

Hope I've made the right decision since I'm only aiming for about 230-240rwkw. Will the VG30 Hi-flow make that target easier (maybe with less boost) than the rb25 hi-flow?

Edited by benl1981

Thanks Dave.

250rwkw - bit of a monster hey! Is your turbo a GCG?

Just looking at old videos of my car accelerating in 2nd. Used to get 8psi by 3000rpm. In 2nd I reckon it's more like 8psi by 3800rpm now...

It has lost some of the crispness at low revs. I guess once its tuned when you want to hit it it will go hard, but for the street I reckon that little stock turbo was pretty fine.

I run this turbo.

The standard R34 GTT turbo has the "VG30" turbine housing.

I run GCG high flow and some other bits and pieces and make full boost by 3000rpm, any gear, any time.

Fat power curve.

I highly recommend it, my tuner tell me that he's never seen one like it that spools so quick.

She's a bit backed up at high rpm, but this is because of the size of the rear housing. it needs to be a little bigger to support more kw without running on detonation.

post-6399-1191982317_thumb.jpg

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

    • 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
    • Apologies for the long read My R34 GTT was up for sale at the beginning of spring due to a few repairs creeping up. The strut tops needed replacing, roof and bonnet (hood) painting (yay for 3 stage pearl) and the underside stripped and treated. I sold the car which allowed me to be in a much better place financially. Leading up to the sale I was already thinking about the replacement. In an ideal world it needed to be a good all-rounder. Something I can mess around with, modify, do track days, do the school run, go on long drives etc.  Options included but not limited to... Laurel C35, Evo 8/9, Civic FD2, Impreza Hawkeye, Aristo and even an Audi S4 Avant (I've already got the Mazda 6 wagon). But there was always one car at the top of the list The Toyota Mark ii JZX110 I found an advert on a Facebook group for an example in Japan, from a seller called Jon at Rising Sun Exports. A few messages back and forth and Jon calls me from Yokohama one morning (or afternoon in his case). He briefly explained the import process, the costs involved and a repeat of the advert. After much deliberation, the price was agreed and the sale was locked in. I've never imported a vehicle so I jumped into the unknown head first. The money transfer was completed through wise.com (fees apply), very easy to use and the money was with him within a day or two.  The car suspension was raised for the vessel and the car dropped off at the port. It was 7 weeks later when the bill of lading was received and the freight invoice sent to me, followed by the export certificate a couple of days after (both digital copies) In the mean time the port had been in contact. I needed an agent to deal with the NOVA (notification of vehicle arrival) along with the tax/duty invoice, this was £75.00. The port also had a fee of £100, I'm guessing to cover the cost of the 10 day 'free storage' and for moving the car off the boat etc. They need a copy of the vehicle invoice, freight invoice and export certificate to allow the vehicle to pass through customs. The vessel arrived on Tuesday 5th August, the tax/duty invoice was generated and sent over. This is generally tax 20% and duty 10% of the vehicle value. Although the invoice came in at a higher amount than I had calculated. Once HMRC had received the payment the vehicle could be released from customs. I thought once the tax/duty was paid you could collect at any point, that's not the case. Your agent will need to book a collection slot, I requested Thursday 7th which was accepted, with a 9:00am slot allocated. It was a 5:00am start from Norfolk heading to Southampton. We eventually found the compound, upon presenting the bill of lading and some ID they released the car (they drove it out of the compound to the front ready for us to load up). The email from the port stated each slot had a 10 minute window, which seemed abit farfetched but the staff said it's not a strict rule. We were there for approx. 30-40 mins in total. A week prior to collecting I contacted my garage and explained the situation, I was able to get an inspection slot that afternoon. For the registration, DVLA require the car to be insured, for this I used a company called Adrian Flux who can insure the vehicle using the VIN number. 
    • Hey guys, looking for these side skirts if anyone can help me out. 
×
×
  • Create New...