What Turbo Set Up For A Rb28

[Greanmachine UK]

It seems that we are often behind on tuning RBs in the uk so I thought I would get some advice from here.

I am putting a step two 2.8 hks engine in my stagea . It has stage 2 cams and a flowed head and all other relevant oil mods etc,

Previously the car had a rb26 with 2860-5s and was runing around 575 . This is before I killed it......... which is another story

The turbos are supposed to max out at somewhere between 600-650 ( sorry its bhp not kw over here)

I am tempted to use the 5s as it should about as responsive as you could get plus of course I have the turbos, pipework and induction already.

If I am going to change I am drawn towards the single route and would welcome any suggestions.

some info

The engine has run a t51kai and produced silly power which I dont want or need .

It has been refreshed and the rest of the car will cope with the power I am looking at .

700 bhp atf would be nice and is achieveable but I am not sure how much different it would spool up to keeping the 5s

as said before any suggestions appreciated (as long as they are sensible)

[zebra]

Stay with the -5s!

[jet_r31]

Id be looking at Precision 6466

cheers

darren

[Shoota_77]

Agree. -5's are borderline too big for a 26 but awesome on anything bigger. Mine were a bit laggy on my 26 but can't wait too see what they're like on my 30.

[Greanmachine UK]

Thanks for the replies I had looked the garret gtx 3582R and the precision range

Agree. -5's are borderline too big for a 26 but awesome on anything bigger. Mine were a bit laggy on my 26 but can't wait too see what they're like on my 30.

The 5s were fine on my 26 which had stage 1 cams and was tuned with an Fcon. Obviously they didnt spool up by 3000rpm but I wouldnt have called them laggy for a turbos putting out 575.

My issue is that it will run out of steam too easily with a step 2 tuned RB28

[zebra]

Piggaz on here makes 470odd rwkws (630rwhp) with -5s on a 2.8L so something north of 700hp at the crank

[zebra]

http://www.skylinesaustralia.com/forums/topic/397676-piglets-rebuild-of-his-busted-tomei-28/?p=6810303

Link to the dyno sheet

[XRATED]

I think you'll find -5's to be too big for a 2.8 in a stagea. It's the weight that's the killer. You wont move 400kg+ more as easily.

My vote would be for r34 N1's if you wan't somthing usable, unless you'r just chasing numbers... and T51r it is.

J.

[Greanmachine UK]

I think you'll find -5's to be too big for a 2.8 in a stagea. It's the weight that's the killer. You wont move 400kg+ more as easily.

My vote would be for r34 N1's if you wan't somthing usable, unless you'r just chasing numbers... and T51r it is.

Im not chasing numbers infact the exact opposite which is why I dont want a t51 .

The problem isnt that the -5s will be too big it is that they might be too small. As said earlier in the thread the 5s were fine on the car when it had a 26 with stage 1 cans and no head work

The 28 is a step 2 HKS motor with stage 2 cams and a fully flowed head

As for weight the car making a huge difference - with a that 26 set up it ran 30-130 in 13.2 seconds on a v box so I am sure they wont be too big,

But all input appreciated

[zebra]

Did you not look at the link I posted?

[Mick_o]

Keep the 5's hands down if you already have them mate I done a few km's Piggaz car today and its absolutely the most amazing car I have ever driven It most definitely will not run out of puff with the step 2 2.8L pm piggaz he will gladly give you some great insight into your setup hes very knowledgable and a good fella and if you ever rode in his car you would take his advice because its just got grunt everywhere

[Greanmachine UK]

Thanks for the input especially the dyno print out. And yes I certainly did read it thanks

And based on that and also other advice over here I have decided that the 5s stay for sure

Should be interesting to drive once it is back on the road. I will definately have to check piggaz's spec to see how it compares with mine

And If I do ever want to chase numbers I can always have it mapped for E85.

Edited August 25, 2013 by Greanmachine UK

[rb26stagea]

As a matter of interest: what mods did you have, and what boost were you running the -5s at on the 2.6L setup?

Sounds very similar to what I have now, and I go back for the power tune in a couple of weeks: would be nice to have some knowledge of a similar setup, although I'm tuning for midrange rather than outright power...

[(OO)SKYLINE(OO)]

I am putting a step two 2.8 hks engine in my stagea . It has stage 2 cams and a flowed head and all other relevant oil mods etc,

Previously the car had a rb26 with 2860-5s and was runing around 575 . This is before I killed it......... which is another story

The turbos are supposed to max out at somewhere between 600-650 ( sorry its bhp not kw over here)

I am tempted to use the 5s as it should about as responsive as you could get plus of course I have the turbos, pipework and induction already.

Stick with the -5's.

The 2.8 will help with the spool of the -5's.

I have seen a few RB28 with -5's and that seems to be the nice setup.

Are you going for the HKS V-Cam 2.8lt?

[Greanmachine UK]

As a matter of interest: what mods did you have, and what boost were you running the -5s at on the 2.6L setup?

Sounds very similar to what I have now, and I go back for the power tune in a couple of weeks: would be nice to have some knowledge of a similar setup, although I'm tuning for midrange rather than outright power...

Head was stock , stage 1 tomei cams . greddy induction, mapped using fcon v pro gold . ran 1.5 bar through a profec b controller

adustable cam pullies. tomei rods and pistons

print out at the hubs

[rb26stagea]

VERY similar to mine: Tomei Type B cams, Greddy inlet, Power FC, AVC-R, adjustable cam gears, JE pistons and Spool rods.

Was looking at 22psi also.

Interesting to see yours peaks at about the same revs as mine did: Pretty sure I start to taper off at around 7000rpm.

at 20psi running lean (fuel pump was too small), it pulled 458HP at all 4 on a Dyno Dynamics.