Jump to content
SAU Community

Recommended Posts

just wondering what duration cams would b the best to use with these particular turbos?

HKS GT2835

Compressor:

Wheel trim - 52T

Inducer Diameter (mm) - 51.2

Exducer Diameter (mm) - 71

Turbine:

Wheel Trim - GT28

Exducer Diameter (mm) - 51.8

Inducer Diameter (mm) - 56.5

i was thinking atound the 260 - 270 degree area.

any help would be appreciated! cheers

  • Replies 122
  • Created
  • Last Reply

Top Posters In This Topic

I'd be saying factory if it's a street car.

I had nothing but excellent results with factory items, same as Guilt-toy did (GT3540/350rwkw).

It's not all about what looks good on a dyno sheet when it comes to cams and what works/doesn't.

But as per past threads, this will always be a highly trivial topic and there are points for and against.

I'd be saying factory if it's a street car.

I had nothing but excellent results with factory items, same as Guilt-toy did (GT3540/350rwkw).

It's not all about what looks good on a dyno sheet when it comes to cams and what works/doesn't.

But as per past threads, this will always be a highly trivial topic and there are points for and against.

hmm i saw GTR in avatar and GT2835, surely we are talking x 2 yeah? so big hp big setup?

sorry guys! yeah i meant to say gt2835 52t x2! i think they are a little larger than the hks gt-rs'??

engine has been built, althought its 20thou over i think it adds lik an extra .03lt so still a 2.6lt!

would be looking at something real mid range for these turbos?!

oh yes, also how much lift can i increase before i have to do what ever else to the head. if the lift is increased, what else has to be changed?? springs, lifters, guides, retainers, valves??????

is the head off? as your gonna be limited to fairly small lift cams (the tunnels need machining to allow the lobes to clear)

Not if U use Tomei cams which use a thicker buckets and smaller base diameter cams. I would use 270 duration 10.8mm lift.

Edited by bradsm87

For the broken record these are NOT GT28 based turbos even though HKS's handle implies they are . They have cropped GT30 turbines and in todays language are called GT3071R's .

GT28 turbines have 9 blades where GT30's have 10 .

A know a little late now but GTRS's would've probably been a better spec turbo . The cropped GT30 turbine does not like being in GT28 turbine housings and this is what they get in CA/SR/RB26 T25 IW flanged forms . The GTRS's use a GT28 turbine in a matching GT28 turbine housing .

Your call but I'd be trying the std cams first because I don't think twin 2835's are going to be super responsive on 2.6 liters .

A .

For the broken record these are NOT GT28 based turbos even though HKS's handle implies they are . They have cropped GT30 turbines and in todays language are called GT3071R's .

GT28 turbines have 9 blades where GT30's have 10 .

A know a little late now but GTRS's would've probably been a better spec turbo . The cropped GT30 turbine does not like being in GT28 turbine housings and this is what they get in CA/SR/RB26 T25 IW flanged forms . The GTRS's use a GT28 turbine in a matching GT28 turbine housing .

Your call but I'd be trying the std cams first because I don't think twin 2835's are going to be super responsive on 2.6 liters .

A .

Those turbo's without a proper head will be very disapointing...no matter what cams are used. You need lots of air to make them work...something a stock head and small lift cams will not provide.

To give some idea on potential I think Joey here was making something like 270 Kw with one of those 2835 cartridges , admittedly in HKS's Pro S housings , on an RB25 . Even If you could coax 250 odd out of each one in RB26 housing form thats a lot of turbocharger for 2.6 liters .

You really need to look at these "GT2835's" more as a small GT30 rather than a big GT28 .

I know it starts the war but a big twin scroll single with two gates winds up being simpler IMO on an RB26 .

Actually someone I know hasn't found the limits of his 1.06 A/R single scroll GT3582R on a 26 yet , so far 370 kw and climbing as flow restrictions are removed from that car . If he gets towards the flow limits of its compressor thats 470 kw though I think he's chasing 400 at the treads .

A .

na, ithe engine is all together! cause i brought these turbos few months after the rebuild cause i wasnt sure my goals at the time!!

Bugger, i would be looking at using something fairly large 270 10.8mm minimum, you know that setup is good for around 800hp :cool: and Bee-R made close to the ton with a pair.

If it was mine id lash out 280 or 290 11.5mm (and associated head gear)... wind up some boost hold the fk on :cheers:

  • 1 year later...

There's a R33 GTR in HPI issue No. 106 that is running the twin 2835 kit. Its running the 270 10.8mm procams and making 550awhp at 25psi.

Only? Pretty poor result if you ask me! Come very close with a set of 'baby' dash 5's/2530 's on a well sorted engine!

My RB26 made 411rwkw on high mount 2835 52T's on a built engine at 'only' 16psi. Came in at 5,300, full boost at 6,000 and went to 9,500+ power still rising, using 280° 11.5mm cams.

I wouldn't use these as 'bolt-on' upgrade.

Guest
This topic is now closed to further replies.



  • Similar Content

  • Latest Posts

    • Yep, so far most have said that it looks like corrosion on the wall from piston not moving. Which then has probably damaged the oil rings and caused those vertical marks. The longest the engine was still after the rebuild, was the winter of 2018 - 2019, plus the boat trip to Japan. When I shipped the car, it had normal gas in the tank but before that winter pause, it had E85 in tank.  In any case, even if either one of those was the cause, it happened close to 6 years ago and the car has been driven something like 30 000kms after the fact. Again, apart from the plugs and the dip stick, there is nothing in the way the car runs that would indicate what has been going on in the engine. I am going to consult a shop and ask their opinion, what would be the best approach. I do have some access to a garage I could use to diagnose further myself, but time is very restrictive. Might end up buying another engine that could be used while this one is being remedied. Without pulling the head, it will be impossible to find out if it needs another bore, but here's to hoping a hone would suffice.  Goddamnit, I would really have preferred this not happening.  
    • Boot is going to be replaced eventually. I just wire brushed what I could and rust converted. Then painted in rust kill primer. the spoiler also got repainted and plugs replaced on the ends. The under side of the bonnet is going to be black also, currently white. But red on the top side, same colour code as the silo to begin.
    • Hi guys, has anyone either purchased or built themselves a rotisserie for their car before? I can only just justify the need for one hence why I should just make one but at the same time, if I make one I can kiss another 4 weeks of potentially productive car working time goodbye because I'm building a bloody rotisserie....  I mainly want it for the application of the body deadener.  Cleaning the old stuff off, priming and then colour over the deadener doesn't worry me, it's just the application using the Schutz Gun that I feel would achieve a significantly better finish painting it side on and keeping the Schutz Gun upright.  I don't think they would work well on the side let alone almost upside down for some areas.  If the product I use (Terosun, etc) could work through a HVLP ok then it might be ok to apply without the rotisserie.   I can get one of these style ones for about $1200 which is pretty good value-     I reckon if I made one it would cost around $500 but it's more the time that it would take is more of a killer than the cost.  They look to hold their value pretty well second hand so I could always sell it after using it and realistically only lose $200-$300 at worst.  Or keep it and buy another project when this one finally sees the light of day... Anyone selling one...? Cheers!  
    • While it is a very nice idea to put card style AFMs into the charge pipe (post intercooler, obviously), the position of the AFM and the recirc valve relative to each other starts to become something that you really have to consider. The situation: The stock AFM is located upstream the turbo, and the recirc valve return is located between the AFM and the turbo inlet, aimed at the turbo inlet, so that it flows away from and not through the AFM. Thus, once metered air is not metered again, neither flowing forwards, or backwards, when vented out of the charge pipe. When you put the AFM between the turbo outlet and the TB, there is a volume of pressurised charge pipe upstream of the AFM and there is a volume of pressurised pipe downstream of the AFM. When the recirc valve opens and vents the charge pipe, air is going to flow from both ends of the charge pipe towards the recirc valve. If the recirc valve is in the stock location, then the section between it and the TB doesn't really matter here - you're not going to try to put the AFM in that piece of pipe. But the AFM will likely be somewhere between the intercooler and the recirc valve, So the entire charge pipe volume from that position (upstream of the AFM, back through the intercooler, to the turbo outlet) is going to flow through the AFM, get registered as combustion air, cause the ECU to fuel for it, but get dumped out of the recirc valve and you will end up with a typical BOV related rich spike. So ideally you want to put the AFM as close to the TB as possible (so, just upstream of the crossover pipe, assuming that the stock crossover is still in use, or, just before the TB if an FFP is being used) and locate the recirc valve at the turbo outlet. Recirc valve at the turbo outlet is the new normal for things like EFRs anyway. In the even of a recirc valve opening dumping all the air in the charge pipe, pretty much all of it is going to go backwards, from the TB to the recirc valve near the turbo outlet. But only a small portion of it (that between the TB and the AFM) will pass through the AFM, and it will pass through going backwards. The card style AFMs are somewhat more immune to reading flow that passes through them in reverse than older AFMs are, so you should absolutely minimise the rich pulse behaviour associated with the unavoidable outcome of having both a recirc valve and an AFM in the charge pipe.
    • Yep, in my case as soon as I started hearing weird noises I backed off the tension until it sounded normal again. Delicate balance between enough tension to avoid that cold start slip and too much damaging things.
×
×
  • Create New...