Jump to content
SAU Community

Recommended Posts

Car: '95 GTR R33 V-Spec, RB26DETT

Miles: 24,000

Current Condition: Bone Stock

Have ordered most of the STD goodies to prepare for this buildup:

* Nismo TwinPlate

* PFC w/Commander & Datalogit

* Fuel Rail, Pump, Lines

* HKS Type R Intercooler

* 264 Cams, Cam gears, etc

etc, etc, etc...

Just finished my RX7 single project, Large Street Port 13b w/Garrett GT35/40, put down 420rwhp @ 16psi (94 Octane pump) and just over 500rwhp @ 22psi (100 Octane). Get excellent spool for my driving habits, starts boosting by 3800rpm, full boost by 4500 - 4800rpm & 9000rpm redline.

Would like to have similar spool and performance caracteristics on the GTR and looking for insight on a single turbo choice for it. The car will be 98% street driven, with a current power goal of 600awhp (US Dynojet). Am currently looking at the Garrett GT40R or GT42R. Will the GT40R take me to 600awhp? Are there other singles I should be considering?

Thanks for your expertise, opinions and advice!

K

Just my personal opinion, having driven both big single and twin high mount versions, I much prefer twin terbs for the street. They tend to be more responsive and give a broader torque curve.

Also, there is no sound on earth like a GTR with two large highmounts spooling up!

my personal opinion , sorry to say this to you GAV but ive also had both twin turbo and single turbo set up in my gtr's and i can honestly tell you that there is no beter feeling, then driving a gtr with single conversion, (eg t78 or t88) waiting for the boost to kick in and hearing the external wastegate open up will serioulsy demolish any thoughts of twin turbo set up being beter, sorry no offence its just my 5 cents.

HKS T04r cut back, or the new HKS T04z.

Both support around 600hp, although the T04z is newer and is supposed to spool up quicker due to the holes drilled in the compressor cover.

Trust T-78 either 33, or 34D.

thats for high mount single.

However, it would be very hard to achieve (on an un-stroked RB26) 600hp and have full boost hit by 4500rpm. thats with any turbo.

I know two people who have made 320rwkw on thier R33 GTR's with HKS 2530's. These are a low mount bolt on application.

They have a great spool and would hit full boost around 4500rpm.

how much does 320 rwkw equate to in HP?

if u r aiming for 600ps or less then the best option would be to go 2 lowmount turbos ..maybe twin trust t51z's or twin hks 2540's or gt-rs's ..that way it will give the best response and torque ..however if u want to go down the single turbo path ..maybe a to4z cutback ..or trust t78 or even a t67 for good response ...there are other things we need to know like are u going to rebuild the engine and gearbox options!

nocab72,

according to Ray Hall's turbo match app, it seems that with a rev limit of 9000rpm and 26psi on an RB26, you will require a GT42 with A/R 1.22 exhaust housing which would give you ~700bhp and 64lb/min worth of air flow.

http://www.turbofast.com.au/TFmatch.html

yeah, it sounds all good and sweet but then again, i'm not too sure how this turbo would be for a street GTR, i would dare say that it would be quite laggy down low but with a monstrous top end power band.

Hi nocab72, my suggestion would be a Garrett GT35R, good for 700 bhp less around 60 hp for losses on a 4wd hub dyno. However I wouldn't be aiming for that sort of power on standard RB26 internals, particularly pistons and conrod bolts.

As for spool up, being a 3.9 litre 6 cylinder 2 stroke, 13B rotaries have a lot of exhaust gas flow. If you want that sort of boost build out of an RB26, I would suggest around 2.7 litres with 9 to 1 compression ratio, porting and a good dose of ceramic coating.

Hope that is of some help.

Hi Harry, looks awesome. What else have you done, other than 2.8 litres of course?

Full spec here

PS; Why di they stop the run at 7,000 rpm?

run went to 7500rpm - chart updated now (my mistake) - limited as no need to run further - engine was set up for max torque on or around 4000rpm onwards

Nice graph there Harry, how is the car to drive? Happy with it?

Excellent!!! and v happy so far - havent really had a chance to drive it in anger yet - still a bit wet here :)

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

    • Could be. Could also be that they sit around broken more. To be fair, you almost never see one driving around. I see more R chassis GTRs than the Renault ones.
    • Yeah. Nah. This is why I said My bold for my double emphasis. We're not talking about cars tuned to the edge of det here. We're talking about normal cars. Flame propagation speed and the amount of energy required to ignite the fuel are not significant factors when running at 1500-4000 rpm, and medium to light loads, like nearly every car on the road (except twin cab utes which are driven at 6k and 100% load all the time). There is no shortage of ignition energy available in any petrol engine. If there was, we'd all be in deep shit. The calorific value, on a volume basis, is significantly different, between 98 and 91, and that turns up immediately in consumption numbers. You can see the signal easily if you control for the other variables well enough, and/or collect enough stats. As to not seeing any benefit - we had a couple of EF and EL Falcons in the company fleet back in the late 90s and early 2000s. The EEC IV ECU in those things was particularly good at adding in timing as soon as knock headroom improved, which typically came from putting in some 95 or 98. The responsiveness and power improved noticeably, and the fuel consumption dropped considerably, just from going to 95. Less delta from there to 98 - almost not noticeable, compared to the big differences seen between 91 and 95. Way back in the day, when supermarkets first started selling fuel from their own stations, I did thousands of km in FNQ in a small Toyota. I can't remember if it was a Starlet or an early Yaris. Anyway - the supermarket servos were bringing in cheap fuel from Indonesia, and the other servos were still using locally refined gear. The fuel consumption was typically at least 5%, often as much as 8% worse on the Indo shit, presumably because they had a lot more oxygenated component in the brew, and were probably barely meeting the octane spec. Around the same time or maybe a bit later (like 25 years ago), I could tell the difference between Shell 98 and BP 98, and typically preferred to only use Shell then because the Skyline ran so much better on it. Years later I found the realtionship between them had swapped, as a consequence of yet more refinery closures. So I've only used BP 98 since. Although, I must say that I could not fault the odd tank of United 98 that I've run. It's probably the same stuff. It is also very important to remember that these findings are often dependent on region. With most of the refineries in Oz now dead, there's less variability in local stuff, and he majority of our fuels are not even refined here any more anyway. It probably depends more on which SE Asian refinery is currently cheapest to operate.
    • You don't have an R34 service manual for the body do you? Have found plenty for the engine and drivetrain but nothing else
    • If they can dyno them, get them dyno'd, make sure they're not leaking, and if they look okay on the dyno and are performing relatively well, put them in the car.   If they're leaking oil etc, and you feel so inclined, open them up yourself and see what you can do to fix it. The main thing you're trying to do is replace the parts that perish, like seals. You're not attempting to change the valving. You might even be able to find somewhere that has the Tein parts/rebuild kit if you dig hard.
    • Can you also make sure the invoices on the box (And none exist in the boxes) are below our import duty limits... I jest, there's nothing I need to actually purchase and order in. (Unless you can find me a rear diff carrier, brand new, for stupidly cheap, that is for a Toyota Landcruiser, HZJ105R GXL, 2000 year model...)  
×
×
  • Create New...