Jump to content
SAU Community

Recommended Posts

Hey just a few quick questions RE: lag..

I recently built my gtr up pretty well and now want to put some power through it.. I'm sticking with the twin turbo setup and am currently tossing up between 2860-7's or 2860-t5's/2530's. I just want to know the difference between 290-310kw's and 340-370kw's..

fastest car i've ever been in is a mates 32 gtr which had n1's and around 260kw.. Anyway basically, is there a way sum1 can compare this to a r32, with an rb20 powered engine? I've been in a few 220/230kw ones and used to drive a 165/180kw one (r34 turbo).. As it is currently a mates 170/180kw gts-t with a 34 turbo on it keeps up with me (not off the line obviously) the GTR running 11psi so i'm not so sure it will be a very accurate way of comparing it but.. What i'm wanting to know is more the lag difference, will the 50kw difference in a gts-t with mods listed be the same as a 50kw difference in a gtr with mods lifted, and at higher power lvls?

Will 350kw be crazily laggy? As in no more cornering? Because i don't want to just go 300kw's after having spent all that cashola on a fair decent rebuild, but if it's gonna take the fun out of driving it, and it's gonna make accelerating out of corners too difficult i might have to..

Also, gtr fuel pumps aren't good for that kind of power ay?

Cheers

As i posted in another thread

-7s/GT-SS/R31N1 - 300-330rwkw

-5/2530 - 360-400rwkw

-7s are the best choice for a street car. responsive as stock, with much more meaty midrange due to the added boost you can run

Makes your car feel like a big 4ltr N/A, basically power everywhere.

oh wow really, didn't think they'd even be close to as responsive as the stock ones :( Stock ones are as responsive as a stock rb20 i'd say so that's sweet, the 2530's wouldn't be much less responsive than one of those 220kw 32's

I've seen some people with GT-SS's and -7's only come up with 290/300kw and was a bit worried, 2530's are a pretty safe 350kw bet, theres nothing in between the gtss's/-7's and the 2530/-5's?

Ok, a real noob question but i am what does the -7 mean? As in 2871R -7 or -5 or -10. Looking at a few turbo's at the moment and coming across all these minus numbers....

hey mate,

Im in the same boat as you!! lol gets confusing hey but this is taken from a trader on here

Garrett GT2860R-7 (R34 N1)

Power Rating (Max): 310hp (620hp the pair)

Details: This turbocharger set-up are OE (original equipment) from the Nissan Skyline R34 GTR N1. They come with adjustable garret actuators.

Garrett GT2860R-5 (HKS GT-SS Equivalents)

Power Rating (Max): 360hp each (720hp the pair)

Details: This turbocharger set-up have extremely similar specifications to the HKS GT2530. They come with adjustable garret actuators.

Garrett GT2860R-10 (HKS GT-RS Equivalents)

Power Rating (Max): 460hp each (920hp the pair)

Details: This turbocharger set-up have extremely similar specifications to the HKS GT-RS, these are a serious set-up.

Edited by Adz2332

Yeh like he said except i think the 2860-7's i'm talking about won't be the nissan OEM ones but rebuilt ones.. pretty sure thats what the disco potato ones are anyway, anyone know if theres a turbo size in between the -7's and the 2860-5's/2530?

GTAAAH

Get either the GT-SS or 2530's (or you want the cheaper alternative the 2860R 5 or 7). both will be great - I have a set of REAL HKS 2530's and they respond great :devil:

my nismo pump and stock injectors, AFM's ECU have made just shy of 300kw@w @ 18psi.

you can't lose!

I can't quite think of a much gayer goal than that. Please explain?!

lol :devil:

Well what doesnt make sense?

It feels like a much bigger motor.

Doesnt feel like a 2.6ltr turbo. See you get in a car with a turbo that comes on say what, 4000rpm. You know its got a turbo.

GT-SS/-7/R34N1 come on so smooth and early that you would think its just a big torqued N/A motor.

Literally there is power everywhere in every gear and you don't really have to 'wait' for boost like a bigger turbo setup.

Downgear off cruise, press pedal, off you go as boost is just 'there'. Its nothing like my GT30 setup, yet makes about the same power.

I mean if you want a peaky laggy setup to 'know' you've got a turbo, good for you... i enjoy my response :D

lol :devil:

Well what doesnt make sense?

It feels like a much bigger motor.

Doesnt feel like a 2.6ltr turbo. See you get in a car with a turbo that comes on say what, 4000rpm. You know its got a turbo.

GT-SS/-7/R34N1 come on so smooth and early that you would think its just a big torqued N/A motor.

Literally there is power everywhere in every gear and you don't really have to 'wait' for boost like a bigger turbo setup.

Downgear off cruise, press pedal, off you go as boost is just 'there'. Its nothing like my GT30 setup, yet makes about the same power.

I mean if you want a peaky laggy setup to 'know' you've got a turbo, good for you... i enjoy my response :D

And that's the advantage of the 3L and a big turbo...

Hit the throttle, while waiting for boost, you have torque, when it comes on boost... GONE!!!

Ash, your car is RWD isnt it? just throw the 26 head on a 30 bottom end with a set of -5's. It should be just as responsive as the 26 with the -7's and it would be hard to spot the difference between the two engines once in the engine bay.

Yeah, wasn't interested in RB30 to be honest, restamping blocks illegally with incorrect engine numbers etc.

Happy with RB26 (plus id rather use a racepace 2.6ltr block with all the dev work done to it)

Just my own choice really end of the day as i picked up gt-ss's at a very good price when the yen was decent 2yrs ago

:D

I've looked in to the legality issues sought advice etc...

Larger turbo's, ECU, bigger injectors are not any less illegal than a larger motor. At the end of the day HP is HP.

If the car is insured and in a questionable accident suspected due to speed/hooning. The aftermarket ecu & larger turbo's will be found and insurance will be void as a result you may be up for the cost of car/property and bodily damage involved. Big $$ and thats still with the 2.6ltr.

When listing mods with the insurance company there is fine print stating it is on onus of your self to ensure mods listed are legal. If they are not well .... Insurance void.

Then there's the bodily insurance that is part of your registration. Illegal mods and insurance is void. Typically mods are not looked at unless it is suspected excessive speed has possibly attributed to the accident.

In short.. They won't go any easier on you just because its a 2.6ltr. Go the 3ltr, full crank collar, forged rods, pistons and ATI balancer (all the bits youd shove in to a tough rb26 anyway) and it will see 8-8.5k reliably with a hell of a lot more low and mid range which allows the sizing of a considerably larger turbo before drive ability is negatively impacted.

Good thing i wont have a problem with my speeding being the cause in the instance of a claim, i'm behaved when it comes to things like that :P

Anyway, this isn't a thread about me or legalities of upgrades... back to the main point :D

Think of the 50kw extra as lots of broken g/box's and front diffs etc. For half a second or one down the quarter for example the ongoing cost of 50kw is huge. I think drag is geh but its an example. A gtr with just under 300rwkw will go all day everyday on stock fuel pump/cams/inj/afm's/radiator etc. A gtr with 370rwkw break drivelines and with the extra power you need bigger inj/fuel pump/afm's/brakes/oil cooler/radiators and lots more to use it to its full potential and they cost big $.

Its not a matter of 50rwkw its the parts that are required to make the power plus the parts to keep it going.

I have 280rwkw guessed in my car reduced from 295rwkw as the inj were maxed and I turned the boost down to keep it safe. Its all you really need on the street or track until you learn how to drive a gtr properly and once you can drive it hard, your continually learn more about how the car handles instead of relying on power. Spend the extra money on good suspension and a 300rwkw will beat a 370rwkw on the track or street. Better off driving it with less power instead of working to pay for it to sit in a workshop and never driving it.

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

    • Look, realistically, those are some fairly chunky connectors and wires so it is a reasonably fair bet that that loom was involved in the redirection of the fuel pump and/or ECU/ignition power for the immobiliser. It's also fair to be that the new immobiliser is essentially the same thing as the old one, and so it probably needs the same stuff done to make it do what it has to do. Given that you are talking about a car that no-one else here is familiar with (I mean your exact car) and an alarm that I've never heard of before and so probably not many others are familiar with, and that some wire monkey has been messing with it out of our sight, it seems reasonable that the wire monkey should be fixing this.
    • Wheel alignment immediately. Not "when I get around to it". And further to what Duncan said - you cannot just put camber arms on and shorten them. You will introduce bump steer far in excess of what the car had with stock arms. You need adjustable tension arms and they need to be shortened also. The simplest approach is to shorten them the same % as the stock ones. This will not be correct or optimal, but it will be better than any other guess. The correct way to set the lengths of both arms is to use a properly built/set up bump steer gauge and trial and error the adjustments until you hit the camber you need and want and have minimum bump steer in the range of motion that the wheel is expected to travel. And what Duncan said about toe is also very true. And you cannot change the camber arm without also affecting toe. So when you have adjustable arms on the back of a Skyline, the car either needs to go to a talented wheel aligner (not your local tyre shop dropout), or you need to be able to do this stuff yourself at home. Guess which approach I have taken? I have built my own gear for camber, toe and bump steer measurement and I do all this on the flattest bit of concrete I have, with some shims under the tyres on one side to level the car.
    • Thought I would get some advice from others on this situation.    Relevant info: R33 GTS25t Link G4x ECU Walbro 255LPH w/ OEM FP Relay (No relay mod) Scenario: I accidentally messed up my old AVS S5 (rev.1) at the start of the year and the cars been immobilised. Also the siren BBU has completely failed; so I decided to upgrade it.  I got a newer AVS S5 (rev.2?) installed on Friday. The guy removed the old one and its immobilisers. Tried to start it; the car cranks but doesnt start.  The new one was installed and all the alarm functions seem to be working as they should; still wouldn't start Went to bed; got up on Friday morning and decided to have a look into the no start problem. Found the car completely dead.  Charged the battery; plugged it back in and found the brake lights were stuck on.  Unplugging the brake pedal switch the lights turn off. Plug it back in and theyre stuck on again. I tested the switch (continuity test and resistance); all looks good (0-1kohm).  On talking to AVS; found its because of the rubber stopper on the brake pedal; sure enough the middle of it is missing so have ordered a new one. One of those wear items; which was confusing what was going on However when I try unplugging the STOP Light fuses (under the dash and under the hood) the brake light still stays on. Should those fuses not cut the brake light circuit?  I then checked the ECU; FP Speed Error.  Testing the pump again; I can hear the relay clicking every time I switch it to ON. I unplugged the pump and put the multimeter across the plug. No continuity; im seeing 0.6V (ECU signal?) and when it switches the relay I think its like 20mA or 200mA). Not seeing 12.4V / 7-9A. As far as I know; the Fuel Pump was wired through one of the immobiliser relays on the old alarm.  He pulled some thick gauged harness out with the old alarm wiring; which looks to me like it was to bridge connections into the immobilisers? Before it got immobilised it was running just fine.  Im at a loss to why the FP is getting no voltage; I thought maybe the FP was faulty (even though I havent even done 50km on the new pump) but no voltage at the harness plug.  Questions: Could it be he didnt reconnect the fuel pump when testing it after the old alarm removal (before installing the new alarm)?  Is this a case of bridging to the brake lights instead of the fuel pump circuit? It's a bit beyond me as I dont do a lot with electrical; so have tried my best to diagnose what I think seems to make sense.  Seeking advice if theres for sure an issue with the alarm install to get him back here; or if I do infact, need an auto electrician to diagnose it. 
    • Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
    • I know I have to get a wheel alignment but until then I just need to bring the rear tyres in a bit they're wearing to the belt on the inside and brand new on the outside edge. I did shorten the arms a bit but got it wrong now after a few klms the Slip and VDC lights come on. I'd just like to get it to a point where I can drive for another week or two before getting an alignment. I've had to pay a lot of other stuff recently so doing it myself is my only option 
×
×
  • Create New...