Has Anyone Got An Rb26 With A Single Gt35 On It?

[Lithium]

Ye but compared to the setup snowman has now with virtually similar power, thats how you notice the difference

Which is?? Assuming it doesn't include a custom gearbox or bigger displacement?

[Gts-t]

What would be the go on a 26/30 for 300rwkw?

uras, disco?

I forgot the keyword

What SINGLE turbo would be the go on a 26/30 for 300rwkw.

thanks guys

[discopotato03]

For my money it would be a 56 comp trim GT3076R based on the 700177-5007 cartridge (real GT3076R) .

It would be your call on which A/R GT30 turbine housing to use but if you want it to be reasonably free reving with reasonable response probably the 0.82 housing would be a good starting point .

IMO but with good reason you should only really use Garretts GT30 turbine housings in non IW single scroll form . If the 0.82 is a tad restrictive (unlikely IMO) and you could live with an IW go the HKS 3037 Pro S one in 0.87 A/R - someone here is trying to sell one ATM BTW .

Some people put GT3582R's on those engines and wonder why they feel a bit lazy , I think its a bit pointless using a 600 odd Hp capable turbo when 450 is the ask . I think its better to have a turbo thats run almost to capacity than one that may never reach it .

Cheers A .

[Gts-t]

Hey A,

thanks for the reply, i will use a 44mm tial external gate on a high mount manifold. Also i will fit some cams if it makes or breaks the turbo lag/response etc. I do plan to go with the .82 rear also

I should probably say also that im looking for 500hp, which is about 305-10rwkw (given a 65kw loss)

Also where is the best place to buy a 3076R turbo with the genuine cartridge etc? Can gcg be trusted?

[RNS11Z]

ok abit off topic here: what turbo would you recommend to use for an rb30 sohc to make 450+rwhp on pump fuel. the motor will be turning to 8k so i dont mind it coming on song @ 5k. Im currently looking for a turbo to use, not sure on what to get.

thanks

h

[STATUS]

I think its a bit pointless using a 600 odd Hp capable turbo when 450 is the ask . I think its better to have a turbo thats run almost to capacity than one that may never reach it .

Cheers A .

hell yeah, finally some-one else with sense. so many times i hear i got a 550hp turbo running 15psi.... what a waste of time... but in the end 550hp is bragging rights and most would not know a good setup if it bit them in the ass.

[discopotato03]

The problem 2630GTS is that most cam profiles for 26 heads are speced for the twin parallel turbos which would give noticeably lower exhaust manifold pressure - once you start using them with single scroll single turbo hot sides the reversion demon may make life difficult . I think I mentioned somewhere here that just to stay even with parallel twins a twin scroll single is mandatory otherwise exhaust manifold pressure characteristics change and very likely won't suit the the rest of the engines setup ie valve timing/static compression ratio/inlet side airflow characteristics .

The way I see it RB26's are a bit of a bastard because of the ways Nissan went about getting power from it . Nearly EVERYTHING was an attempt to have high flow rates at lowish pressures (unrestricted) because thats what works in a limited capacity 4-8 rev range engine . Don't get me wrong its all good (low exhaust restriction and creamy inlet system) but if you want to alter its state of tune everything that affects air and exhaust has to be considered because they all affect one another .

If you look at the setup in an RB25DET its very different to an RB26 , obviously still a performance turbo twin cam six but its based on one turbo and a single throttle valve plenum inlet manifold .

Now because people like Mafia don't give in easily we know that 300 Kw can be screwed out of a reasonably std RB25DET if you try hard . If that head was improved a little and plonked on a three litre block it should romp it in - with a single scroll single IW turbocharger and std inlet manifold system . Its the cost of the externals thats so much lower doing it this way than with an RB26 top end .

At the end of the day it hasn't got four paw traction so extreme states of tune will achieve zip - as in unzip your wallet and nothing falls out when it comes to having a life .

Now I don't know how deep you are in here as in what you you already have and whats its cost so far . Need an update I think .

Cheers A .

Just for the record that HKS housing being sold is not mine , someone else here .

[Gts-t]

Hey A,

thanks for the long reply, i like the way you think. As far as cash goes im not loaded but if a part can show its merit ill more than happily get it.

The car is aimed at circuit only. Im trying to build basically a rwd gtr with more capacity/torque, lighter weight, the 6 throttle bodies etc. Then see how much i can mix it up with the gtr's in the dry. Obviously in the wet its never going to happen

Looking at atpturbo.com it showed that i could get the GT3076R with a split pulse exhaust housing, is this what you mean by twin scroll? My next problem then would be finding a good split pulse top mount manifold if that was the case. EDIT: turns out i was making it up, the split pulse housing is available only in .78 rear, too small for rb30 id think.

As far as cams specs go i have no doubt what you are saying about the low pressure stuff, but wouldnt real world results of rb26's fitted with high mounts come into play here. And yeah im sure there are a lots of shit single turbo rb26 combo's but try and think of the good ones like the saurus and garage katogani gtr's

Also about the cam profiles, its not a big issue to get a set of aftermarket cams. I dont know heaps about cams but figured if they were for a rb26 round 256 deg and 9mm lift then, they would be basically the same as a rb25 pair with the same specs.

My biggest reason for wanting a single is to remove compromises in the twin turbo system, that is being able to have an external gate, better dump pipe design etc. The fact that i have a rb20 pfc that only allows one afm and 02 sensor also weighs in.

Maybe i should get a gtr loom, gtr pfc, another afm and 02 sensor and throw a pair of those 2530 garret equiv's everyone loves on there. However this might be the easy way

Edited November 26, 2007 by 2630GTS

[discopotato03]

So many workable ways to skin the cat , just need to find the simplist most cost effective one .

I think you need to draw up a list of the pros and cons of a twin turbo setup vs a single twin scroll (split pulsed) one and then cost it out .

Actually even before that I think you need to think seriously about what your trying to achieve here . It may or may not be an easy task to take on the GTR's , sure you should be lighter but will that make enough of a difference ?

Weight works for and against a GTR , for when it comes to weight on the driving wheels but against when it comes to changing direction and stopping .

There was a bit of history made with the Ford Cosworth Sierras and in their case it was mainly bad . With local oposition only being the Doors and Cans they did quite well , light weight and a fair bit of admittedly peaky squirt .

When the R32's came along they had to push harder to stay competitive and thats when they found that they couldn't keep rear tyres on them . In the dry and on the straights the DJR Sierras could just about stay with the GMS R32 (1992) but in the courners and with wet greasy surfaces forget it . I've got the tape of Bathurst 92 and I think it may have been that year that Dick Johnson blew a rear tyre at something like 270 on the way down conrod and and spun the thing I don't remember how many times . Very lucky to drive it away .

Anyway that was a case of more power than traction and the legal tyre sizes couldn't hack it .

If I wanted to seriously take on the GTR's with a view to winning I'd be looking at Evo Lancers because they've become arguably a superior package particularly with chassis balance and weight distribution . They have the electronic smarts just not available to Nissan in the late 80's and suspension development is a never ending thing .

Please don't think I'm being totally negative about your plans but if you don't achieve what you want its a bitter and expensive pill isn't it . To sink 30-40G into building and maintaining a race std R32 makes a not too old Evo seem affordable , you could just about do wheels/tyres/pads/fluids and have a bit of fun in that . If its not for you I think you'd turn it into more moolah than a 3L 2WD R32 .

Food for thought , cheers A .

[Gts-t]

Thanks A,

I think all the same things, and ultimately can only hope to be on the heels of Gtr's in the dry. Think of it as roys car with a better motor.

Honestly though i dont care that much about the gtr's it would just be nice to have a car that can perhaps mix it up a bit with them over 1 lap in the dry. Not a 10-30 lap race, and yeah def not in the wet

I like the idea of a gts-t with rb26/30 so that i can

1. Stay the rwd junkie i am

2. have a lower weight, better weight balance, and better turn into the corner from the missing 150kg front drivetrain

As far as evo's go i dont like the fact the computers are doing the driving, similar to the gtr perhaps

At the end of the day my project is not that $$ smart and will cost alot of coin, but like ive said im not going to break down and cry if it doesnt come any closer to the gtr's than roys car. I will still have what i want , that is a good gtst

Only thing i can see going bad is that the 3.0 will be too much torque and ill have to build a 2.6 for it in the future.

At this stage, thanks to your input, ill add a set of cams to the build and the turbo will most likely be the GT3076R with 44mm gate on a gcg manifold.

Edited November 27, 2007 by 2630GTS

[TommO]

Nothing wrong with staying with a GTS-T, they're still great cars... besides, just chuck some mickey thompson tyres on the rear and go hunting for traffic lights haha..

As far as evo's go i dont like the fact the computers are doing the driving, similar to the gtr perhaps

Nah, quite different. I've owned both and I can assure you a GTR is much "harder" to drive fast than the Evo... GTR will actually still get very sideways and won't just come back by itself, the Evo is just gas -> brake -> turn -> gas. Very fast, not as much fun

[Gts-t]

Yeah i understand that tommo, from a rwd purists point of view tho the gtr and evo are in the same basket.

Wont be doing the slicks thing nor the traffic lights

The aim is to be fast over 1 lap on the track in the dry, not that i dont like some "fun" in the wet

Edited November 27, 2007 by 2630GTS

[STATUS]

Please don't think I'm being totally negative about your plans but if you don't achieve what you want its a bitter and expensive pill isn't it . To sink 30-40G into building and maintaining a race std R32 makes a not too old Evo seem affordable , you could just about do wheels/tyres/pads/fluids and have a bit of fun in that . If its not for you I think you'd turn it into more moolah than a 3L 2WD R32 .

Food for thought , cheers A .

fair side track but speaking of EVO's i coulda had this super lap car in the shed for a measy 30k

[Gts-t]

Hey trent,

what single turb would u use on a 26/30 with for 500hp, 7000rpm and 1 bar boost limit.

thanks bud

Edited November 27, 2007 by 2630GTS

[STATUS]

Hey trent,

what single turb would u use on a 26/30 with for 500hp, 7000rpm and 1 bar boost limit.

thanks bud

dont know, that is not a combo i would ever consider building as its a mismatch 1 bar of boost and a limit of 7000 to get 500hp would requie something big and useless... you would be better of with 1.2-1.4bar 7000rpm limit then we would be talking my sort of setup.... emphasis on mid range torque spread, done to maximise the power spread from the on point to the low 7000 rev limit. better to get the turbos working a bit harder to make that 500hp yet not run out of useable revs.

[Gts-t]

A standard internal rb30 is limited to 1bar boost, 7000 rpm and 500hp (well really 475) so its for that reason they are the limits.

I dont really want to put a forged piston/rod combo just to run more boost, though the increase in cr would be nice.

I would have thought there were single turbos available that where in their effeciency band at 1 bar?

What is your new single setup consist of?

Previous info from SK suggested that a gt3040 would supply roughly 500hp at 1bar boost.

Edited November 27, 2007 by 2630GTS

[SirRacer]

A standard internal rb30 is limited to 1bar boost, 7000 rpm and 500hp (well really 475) so its for that reason they are the limits.

I dont really want to put a forged piston/rod combo just to run more boost, though the increase in cr would be nice.

I would have thought there were single turbos available that where in their effeciency band at 1 bar?

What is your new single setup consist of?

Previous info from SK suggested that a gt3040 would supply roughly 500hp at 1bar boost.

I dont know what planet your on but Rb30's are running around everywhere running more than 1 bar boost and 500hp with stock internals.

One car in NZ running stock pistons ran 10.4 and is still going strong 4 years after the engine was put together. It ran 475kws (nitrous fed and turboed) and still is together now?

[Lithium]

I dont know what planet your on but Rb30's are running around everywhere running more than 1 bar boost and 500hp with stock internals.

One car in NZ running stock pistons ran 10.4 and is still going strong 4 years after the engine was put together. It ran 475kws (nitrous fed and turboed) and still is together now?

Simon Dudding ran his first 8 on the pick a part RB30

[Sydneykid]

I dont know what planet your on but Rb30's are running around everywhere running more than 1 bar boost and 500hp with stock internals.

One car in NZ running stock pistons ran 10.4 and is still going strong 4 years after the engine was put together. It ran 475kws (nitrous fed and turboed) and still is together now?

So that's 1, I can show you 30 or so that didn't make it. Roll the dice if you like, but don't be surprised when it comes up snake eyes.

Back on topic, an RB30/26 with 500 bhp in a 1200 kgs R32GTST won't have any problems with minor mismatches in turbos to manifolds, split pulse or not. You would be hard pressed to even feel it, even if you totally stuffed up all of the choices. Search for the cheapest GT30 combo (ball bearing core of course) with a China T3 flanged manifold and stick it on. Make sure you support the turbo's weight with some bracing, the manifold will be OK then. I guarantee that the tune will make more difference as 3 litres of exhaust pulse covers up for many sins.

Cheers

Gary

[Roy]

Like i have said all along. Changing an Rb20 to RB30 is Bird Dog Engineering.

...cheep, cheep...ruff, ruff...