Jump to content
SAU Community

2860 Help Please

donkey

By donkey,
in Engines & Forced Induction

 Share

Recommended Posts

donkey Community Regular

donkey

Posted
Posted

hey all,

so ive just had the full garrett treatment; 2860-5, 115mm FMIC+ pipping, LINK G4, 770 inj, profect b, hks twin, nismo pump, standard mint engine running 18 lbs, 7500RPM limit, 320AWKW......

i dont want to have to go through the whole forged rebuild yet, but will eventually, i am really only using this car for street, and am guessing if i start winding these buggers up to around the 380+awkw its going to put a strain on the rest of the car

QUESTIONS

i think i would like to trade down to the smaller -7's

i miss the big kick of the smaller turbos, im not after massive power

1. so the -7's are maxed at around 330awkw, what kind of boost is needed for this figure?

2. are cams needed?

3. has anyone driven same car, but with the different turbos, is there quite a big difference?

4. am i stupid? i kinda was given wrong advice on turbo sizing

5. have tryed searching but it aint working

cheers robbie

Link to comment
https://www.sau.com.au/forums/topic/250659-2860-help-please/
Share on other sites
Bakes Mentor

Bakes

Posted
Posted

Read this thread:

http://www.gtr.co.uk/forum/99765-gt-ss-gt2530.html

2530s are similar to what you have -5. A good tuner will get similar response out of -5 to the -7 (only 500rpm difference) but with more power from 5000rpm onwards.

There are some in the thread that started with the -7 and went to the -5. They say they prefer the -5 set up.

Id be listening to people who have had both set ups, but thats just me.

Heres a link to GTSS vs -5 done on the same car on the same dyno if that helps.

http://sthitec.blogspot.com/2008/05/gt-ss-...or-2560r-5.html

rev210 Grand Master

rev210

Posted
Posted

The setup of the -5's it's bundled off with the 0.64 AR rear as opposed to the smaller hot side on the -7's , so at 250rwkw plus it's got an easier path to push the compressor to it's potential.

The -7's at 330rwkw are going to need lots of boost and due to the efficiency range will be pumping much hotter air than the -5's or -9's.

The -9's are better than -7's and if setup correctly will get you the same power you have now (320rwkw) with 1,000 rpm or more of earlier spool and a larger amount of power in the lower / mid part of the power band.

The key factor in getting the turbos to do what you want is to set them up correctly. The -9's are very tune forgiving and this is clear from the compressor map.

I reckon -9's with a larger 0.84 housing (and custom dumps to suit) would be the ultimate with a serious build/cams.

donkey Community Regular

donkey

Posted
  • Author
Posted
The setup of the -5's it's bundled off with the 0.64 AR rear as opposed to the smaller hot side on the -7's , so at 250rwkw plus it's got an easier path to push the compressor to it's potential.

The -7's at 330rwkw are going to need lots of boost and due to the efficiency range will be pumping much hotter air than the -5's or -9's.

The -9's are better than -7's and if setup correctly will get you the same power you have now (320rwkw) with 1,000 rpm or more of earlier spool and a larger amount of power in the lower / mid part of the power band.

The key factor in getting the turbos to do what you want is to set them up correctly. The -9's are very tune forgiving and this is clear from the compressor map.

I reckon -9's with a larger 0.84 housing (and custom dumps to suit) would be the ultimate with a serious build/cams.

rev210 Grand Master

rev210

Posted
Posted
hmmm, maybe i should just increase the boost to 20lbs, and see how they feel then, dont get me wrong its a sweet car to drive, but miss the ol' "chuck back into seat"

At 320rwkw you should be thrown back alot more than the stock turbo's.

You could tune the bottom end power band with adjustable cam gears and lop off the top end power to keep the stock motor alive.

It will be a nice suprise for your tuner to be one of the few people who walk in and say " up the boost to 20lbs we are aiming for the best mid range and I want to limit the top end to 300rwkw and 7000 rpm ".

Redman180 Rookie

Redman180

Posted
Posted

My rb26 has the 2860 -7 and is making 300rwkw at 16psi it fairly throws me back into the seat... was enough for a passenger to bend the support for the backrest lol. i'm thinking about winding them up to 18-19psi and going for 330-340rwkw with a more aggressive tune.

joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted
At 320rwkw you should be thrown back alot more than the stock turbo's.

You could tune the bottom end power band with adjustable cam gears and lop off the top end power to keep the stock motor alive.

It will be a nice suprise for your tuner to be one of the few people who walk in and say " up the boost to 20lbs we are aiming for the best mid range and I want to limit the top end to 300rwkw and 7000 rpm ".

that's what i did with the 33

hks 2835 pro s on stock rb25 with adj ex cam gear

i'm gettin 265 where most people are gettin 280 BUT i have stock turbo response and couldn't be happier

Redman180 Rookie

Redman180

Posted
Posted

yeah i get full boost by about 3200 - 3500 and with the bottom end of a 26 it's not too worrying to have it alitlle later at least you can drive off boost around town easier but it's still super responsive and doesn't stop pulling till the rev limiter.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • suko
      J50 clock date suddenly reset to January 1

      By suko · Posted

      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 ).
    • GTSBoy
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By GTSBoy · Posted

      Yuh, if it's 45°C outside, my car is driving in it.
    • soviet_merlin
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By soviet_merlin · Posted

      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. 
    • BaronOBeefdip
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By BaronOBeefdip · Posted

      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.
    • Bwagz
      Engine model

      By Bwagz · Posted

      Thanks for that, hadn’t used my brain enough to think about that. 
×
×
  • Create New...