What Single Turbo For Rb27 Jun Stroker Engine?

[R31Nismoid]

if you do change from a single to a set of twins... then i wanna see an before/after lol

I'll stick it in my sticky @ the top

[manage13]

knore, I have had lengthy discussions with Sydneykid about the GT-RS set up. He confirmed that they are a very good turbo set up for a 3Ltr RB26. Apparently most of the GTR's using this set up are running the OS 3Ltr block. But it will be interesting to see how these will perform on a 2.7.

[Maxx]

this car has very similar spec to what u have but "slightly" better.

a complete Jun crafted long motor with Jun spec T78-33D turbo and tuned by Jun's owner

[DICKY]

With your camshaft set up & 11.35 lift generally means your car will not be that streetable. I spoke to 4 Door Gtr on the phone about his set up and he said it was far too lumpy for the street

BULL

I have 11.35 lift jun cams with more duration than above in my 32, it pulls from 1100rpm in fourth as clean as a whistle , it idles like a watch !

I also had the jun retainers & springs but had to ditch them ! the first set of springs jun sent me had f all seat pressure, the second set bound up before full lift I did not try a third set ! maybe all that is missing from JUN is the K ?

so be warned - get an expert to install & check those springs !

as for the turbo- t51r kai

IF ANY ONE WANTS A SET OF JUN TITAINIUM RETAINERS CHEAP, DROP ME A PM

[T04GTR]

screw low mounts. laggy and sloww building. you want it to whack on boost hard and fast.

t04z garrett with .84 splitpulse rear(not hks ones)

1.5inch manifold runners (no bigger)

this would be fun and come on full boost by 4ish

if you are going to rev the date out of it then a t51r kai ball bearing would be the go. but lagmaster

Edited August 31, 2005 by T04GTR

[NinetySix]

700hp GT35/40 with 1.06 rear

available with internal wastegates (identical to a falcon turbo exhaust housing) brand new for about $1800 ... got one sitting in my wardrobe

[Gav]

knore, I have had lengthy discussions  with Sydneykid about the GT-RS set up. He confirmed that they are a very good turbo set up for a 3Ltr RB26.  Apparently most of the GTR's using this set up are running the OS 3Ltr block. But it will be interesting to see how these will perform on a 2.7.

<{POST_SNAPBACK}>

I have a new N1 block being built up with a 2.8L crank and HKS internals running GT-RS terbs. On my old engine (std displacement) these terbs produced 1 bar of boost by 4400 rpm without any cam timing optimisation. I expect signficantly better response with the increased capacity as well as extended head room with the counter balanced crank and an HKS Crank Damper kit fitted.

Will of course post results.

[Sydneykid]

I know this will get lost, but time to say it again;

1 bar of boost by 4,500 rpm

In what farkin gear?

With how much bloody load on the engine?

After how farkin long?

Shoot, I have a GT42 that makes 1 bar at 4,500 rpm, in 4th gear up a long, steep hill after the throttle has been floored for 5 minutes.

That sort of quote is MEANINGLESS, it tells me nothing about how the turbo responds. I have driven 3 X Skylines with GTRS's and race team we supply in the UK has tested them on 2 of their cars with 2.7litre engines. Their response is crap, with all sorts of camshafts, different timing and lift, bigger valves, ceramic coating and some serious tuning on the chassis and engine dynos. It wasn't until we stuck them on a 3.1 litre bottom end that they got any decent response out of them.

I will be interested on what Gav finds on a 2.8 litre engine, it might be JUST big enough to get away with it. Even then it will need a close ratio dog box with slick shifts to keep things happening over the 1/4.

cheers

[Gav]

I know this will get lost, but time to say it again;

In what farkin gear?

With how much bloody load on the engine?

After how farkin long?

Shoot, I have a GT42 that makes 1 bar at 4,500 rpm, in 4th gear up a long, steep hill after the throttle has been floored for 5 minutes.

That sort of quote is MEANINGLESS, it tells me nothing about how the turbo responds.  I have driven 3 X Skylines with GTRS's and race team we supply in the UK has tested them on 2 of their cars with 2.7litre engines.  Their response is crap, with all sorts of camshafts, different timing and lift, bigger valves, ceramic coating and some serious tuning on the chassis and engine dynos.  It wasn't until we stuck them on a 3.1 litre bottom end that they got any decent response out of them.

I will be interested on what Gav finds on a 2.8 litre engine, it might be JUST big enough to get away with it.  Even then it will need a close ratio dog box with slick shifts to keep things happening over the 1/4.

cheers 

<{POST_SNAPBACK}>

Ooh - harsh comeback - guess I should have elaborated more.

OK - the boost vs rev quote was on the dyno in 4th gear (pic in gallery). SK's right in that it doesn'r really tell the whole story.

Yep - they are less responsive than 25/30s, but better than 25/40s in my opinion having driven r32s with all of these combos. The curve just doesn't seem to taper off at the high revs like either of these, however, so if the engine supports the revs they make for an impressive combo IMO

Anyway, not meant to be an GT-RS vs 25/30 debate, just that recently there is a huge appreciation on what cam timing can do to "wake up" GTRs. I'm sure the same applies to these terbs, particularly with extra displacement.

Anyway - all theory until it's finally done.

[TurbostyleR]

I personally wouldnt go with any of the turbos mentioned thus far...

I would personally go with an Apexi RX6B or something along those lines.

Im using one on my SR20 - which has had the front wheel and cover modified - and its making around 390rwhp on 17psi with the usual support mods and a set of BABY cams, on a very conservative tune...

I get full boost around 4800-5200rpm depending on gearing and load...

On a 2.7 i think it would easily make ~500rwhp on around 1.6-1.8bar and have excellent response...

[pnblight]

While we are talking about twin well i still think the GT2560R takes alot of beating the last gtr i did made 510rwhp at 15.8psi (~524rwhp at 16.8psi) with rasor sharp responce.And interesting how opinions change in time (was told there was nothing significant in cam timing but i found it very different). Mine runns GT2560R aswell and makes 530rwhp at 20psi and both these cars had poncams and std fuel system (nothing special like high lift cams etc).

As for the boost at a set rpm, in my opinion it is important or a true indication of performance as it is only a measure of back pressure WHAT is important is the toque and hp you get through the rev range and how earily it comes in and how linera the power delivery is, as this is what makes a great streetable car and fun drive.

pete

[Blitz]

Cannot wait to see the end result

Nick

[StageZilla]

on a similiar note, would a smaller turbo choice like a gt35 still pull solid to 10000rpm redline? or will it flatten out at 8000rpm or something?

cheers

Brad

[pnblight]

on a similiar note, would a smaller turbo choice like a gt35 still pull solid to 10000rpm redline? or will it flatten out at 8000rpm or something?

cheers

Brad

<{POST_SNAPBACK}>

There's a lot of variables in that question, cams and cam timing will play a very big part power curve, plus exhaust system etc but it will largely depend on the efficiency of the engine (ie the power it makes at what rpm) this will govern when the turbo runs out of puff.

pete

[Topaz]

hmm, I see your building "The Stagea Of Death pt.1"

quite an impressive shopping list, the car doesn't have enough surface area to list it all

When its done I wanna see it (and hear it) next to Ant's GTR - Jet Engine

[StageZilla]

hmm, I see your building "The Stagea Of Death pt.1"

quite an impressive shopping list, the car doesn't have enough surface area to list it all

When its done I wanna see it (and hear it) next to Ant's GTR - Jet Engine

<{POST_SNAPBACK}>

hehe, yer its gonna abit of a shocker for other road users in its path :lol:

im just deciding on turbo choice at the moment and the engine is being machined and head also for the high lift cams, hoping to get engine block etc back in about 2 weeks, and then just gotta reassemble.

its either big single and options are:

hks t04z

garret t04z 0.86 or maybe 1.06

garret gt35/40r 0.86 or 1.06

garret gt40r 0.86

or maybe something will come up for sale of a diferent variety, i still havent totally ruled out twin low mounts.

options are:

hks 2530s

hks 2540s

garret 2560r

r34 n1 0.64 BB twins

hks gt-ss (bit small maybe?)

hks gtr-s (bit large maybe?)

i still have same power goal of 500rwhp on reasonable boost and on higher boost capable of close to if not 600rwhp or abit higher

so whats the pros and cons of each and considering the parts list im using how it suits my needs?

thanks

Brad

[oh to dream]

since you have all the parts plus an aftermarket manifold for a single turbo it would make sense to go that route, however, i didn't see a gearbox in your list of goodies...

if u can afford jun engine accessories, even if it was a special deal, u can afford to spend the money on an HKS turbo(s).

also assuming this car will be taken to the track; professional drivers run out of balls whilst driving the mines r34 (2530's) before the car runs out of power and although your not building a race car, anything that revs out to 10,000 rpm could hardly be called a street car.

best of luck with the build whatever route you take.

[StageZilla]

since you have all the parts plus an aftermarket manifold for a single turbo it would make sense to go that route, however, i didn't see a gearbox in your list of goodies...

if u can afford jun engine accessories, even if it was a special deal, u can afford to spend the money on an HKS turbo(s).

also assuming this car will be taken to the track; professional drivers run out of balls whilst driving the mines r34 (2530's) before the car runs out of power and although your not building a race car, anything that revs out to 10,000 rpm could hardly be called a street car.

best of luck with the build whatever route you take.

<{POST_SNAPBACK}>

hey mate cheers for the comments, im staying around 600hp on dyno and 500hp at street and i know the box wont be too crash hot but we will have to wait and see

so would 2540s we worth going over 2530s because of the horsepower target im chasing and the fact it will be 2.7L (bugger all increase i know)?

decisions decisions

thanks

Brad

[StageZilla]

whoops double post

Edited September 5, 2005 by StageZilla