Jump to content
SAU Community

Recommended Posts

  • Replies 105
  • Created
  • Last Reply

Top Posters In This Topic

Not too sure Joel, HKS dont have cores, they are a standard garret item - HKS only have proprietry on the comp and turb cover and compressor wheel.

I think it would be more likely to have something to do with turbine AR and comp wheel trim - bigger turbine AR will flow more, but will take longer to build boost, bigger comp wheel will flow more, but if too big could (in theory) result in a miss match to the turbine and result in surge. Always a trade somewhere.

The reason I said it was because he originally said he had a 0.68. I would like to know the exact spec differences to give a better idea of the comparison between the two. Without knowing all the specs, it would be useless comparing;)

At the end of the day, the only true way to compare would be on the same car, cos lots of things can make a difference. I noticed a considerable loss of power when I swapped my N1 exhaust for a nismo dual muffler one.

My big problem at the moment is that I want to try a bigger turbine AR, as I feel the 0.61 is maybe causing a bit too much back pressure. It is interesting that the HKS 3037 kit for RB25 uses a 0.87 AR. Might be worth giving it a try, but at well over $500-$750 a pop for the housing, I am not going to rush out and buy the full range to see the difference:D

Steve: I now have a .81 A/R Ex Housing and noticed a large difference in detenation(spelling?) levels. In my early stage I had the same tuning, same turbo specs apart from the bigger A/R ex housing and my detenation levels reduced by 1/3. I have put this down to less back pressure, less heat , and less cylinder back filling on cam overlap. Obviously my turd is no were near standard now.

The spool up difference from .6 to .8 A/R was hardly noticable. Smoother maybe.

Great results GTS-t VSPEC!! Wow, it really seems that the GT30 turbos are responding well on the RB25s. 270kW@wheels on 13psi is a $#!T load!! :) Sure you'll be having traction problems. The only problem I see with comparing dyno figures is that they can vary from dyno to dyno. Also depends on the air temperature of the day. For example, the JUN s15 equipped with T88 (in Perth I think) produced something like 700rwhp on one dyno, only to get 550rwhp on another dyno. Something like that anyway, I read it in a Fast Fours mag. Anyway, point being that there is a difference between all dynos. To compare two cars you really need to dyno both on the same dyno on the same day. In the end, it's really how fast you run the 1/4 mile which is going to judge how quick your car is. Still, very impressive figures to both! ;)

I think most companies use the Dyno Dynamics dyno (?). Very nice results, will be interesting to see how the turbo fares as the boost is increased. It does seem to produce more power than Steve's HKS one, but it also seems to have more turbo lag. Maybe there is a noticeable difference between the Garrett and HKS turbos afterall?

Once you guys start increasing the boost, then we should be able to see what happens. I've heard that HKS turbos are more efficient at a higher boost level (eg 1.5bar), and that they spool up faster. I've heard that Garrett turbos are more efficient at lower boost (eg 1.0bar). Guess time will tell...keep up the good work!!!

Steve: Do you know what are the differences between an HKS turbo and a Garrett turbo? I heard that the cores and turbine trims are the same. The only difference are the compressor housings and compressor trims. Are the exhaust housings also different? Or is it in size where they are different? Example: I know the GT3037S can have a 0.73A/R exhaust housing, and I don't think the Garrett GT30 has the same size?

The reason I ask is because I have a broken GT3037S turbo. It has a damaged turbine wheel and I am going to try get someone to repair it - either GCG or Garrett in Sydney. If the turbine wheel is replaced with a Garrett turbine wheel, could my repaired turbo still be classified as an HKS one? Meaning that the turbine wheels are the same for both Garrett and HKS GT30 cored turbos?

Originally posted by BOOSTD

Steve: I now have a .81 A/R Ex Housing and noticed a large difference in detenation(spelling?) levels. In my early stage I had the same tuning, same turbo specs apart from the bigger A/R ex housing and my detenation levels reduced by 1/3. I have put this down to less back pressure, less heat , and less cylinder back filling on cam overlap. Obviously my turd is no were near standard now.

The spool up difference from .6 to .8 A/R was hardly noticable. Smoother maybe.

Thats the thing I am thinking, back pressure with a turbo is the big killer, and I am a bit worried with larger cams, therefore more overlap, things could get worse rather than better.

But if you reckon there is bugger all difference in spoolup time between 0.6 and 0.8, I think I might have to speed up the swap.

Smoother onto boost would be good, cos at the moment its bloody violent. I tried upping the boost to 1.2bar on the previous tune and holey fark, 120kmh - 4th gear and only 1/4 to1/3 throttle and the bloody thing got severly bent out of shape, thank god no cars were beside me.

RS500, if it were a 0.73, or maybe a 0.87 ( but I think I would have to give it a spin first) I would be tempted.

But 1.01, now why would you be trying to off load that??????

EVOIV, as far as I know HKS have proprietry on the housings and the comp wheel, which is why no one can buy them except HKS.

As far as I know, exhaust wheel and cartridge can be purchased direct from garret, or be ordered in by your local turbo shop.

Anybody out there got a 0.73 or 0.87 3037 turbine housing they want to off load:D

Steve: As you know, I have a GT3037S in bits at the moment. Compressor and Turbine housing, and core. The exhaust housing is a 0.73A/R. I am still not sure what I am going to do with this turbo. I do want to get it repaired eventually, if I can get my lazy ass into gear :P Also, not sure if it can be fixed - it will have to go to GCG or Garrett first for an inspection. But hopefully it can be as I think the turbine wheel is the only damaged part. If it does get fixed, I may opt to put on a larger turbine housing (sourced from where I don't know?). So then the 0.73A/R might be up for grabs. Maybe I should buy the 1.01A/R of RS500? :)

i might be lining up a buy off a friend for a GT3037 with a 1.01 exhaust housing, so if i get it, i'll swap ya no probs

yeah, if this works out and i sell my current turbo, i'm ready to move into the ball-bearing world :P

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

    • Well, I can recommend the partial AV system translation CD I ordered from Car Audio Workshop in NZ. Whilst it didn't address the date issue, it has conveniently translated on-screen menu items into English, and now allows the GPS-received time to be offset in hours rather than minutes, so I can display Eastern Australian time accurately ( and bump it by another hour when daylight savings starts ).
    • Yuh, if it's 45°C outside, my car is driving in it.
    • I'd be curious to hear more. Otherwise, have you driven a modern x-trail? I wonder how it compares. Here in Australia they are/were popular for rentals and fleet vehicles. I have been in some and my impression was they are bad. But, this may have been very different in the 2000s at a good trim level. Twenty years is plenty of time to make the model worse. I do very much agree with the 2 silver cars in the garage approach. But, not driving because it's too hot would not leave a lot of time in the year for many Australians. I don't think you need to worry too much unless the car has actual issues with overheating. 
    • Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Thanks for that, hadn’t used my brain enough to think about that. 
×
×
  • Create New...