HKS GT-RS questions

[Lithium]

Hi

I know at least a couple of people have HKS GT-RS turbos on their R33 Skylines, and have seen some dyno results from people using them - but there are a couple of questions which have I've had that I haven't found answered yet:

What boost level is the actuator that comes with the turbo set to?

Do people use the factory fuel system - or upgrade the pump? Injectors?

What kind of 1/4 mile times have people with them on R33s achieved?

Any input would be appreciated

Cheers

[Trust33]

hi mate i think they upgrade the fuel system with the turbo.It makes allot of scence.

P.S. Allot of people say that the hks actuators are set at 1bar permanent but i belive that this is not the case as how can people not have a lower seting of boost for their given application.

I think that it is the recomended pressure that they run best at most efficiently for heat created spoolup,response and peak hold psi.IMO not many others i think though.

[Reedy]

Not sure what boost level the actuator comes set at but the minimum boost I can run is 0.9 although it still seems to sit at 15psi anyway, max boost is 1.2 with stock internals.

I have a bosch 044 fuel pump and 555cc nismo injectors.

Have not taken it to drags yet but got 270rwkw and not to much lag so should be in the 12s depending on tires?

[paulr33]

This is what I found on google

Direct bolt-on to stock manifold. Includes 0.9kg Actuator, Gaskets and other Hardware. S13 requires custom or modified oil/coolant lines.

52T / A/R 0.64 / T25 Inlet / Internal Wastegate

[benm]

You will need aftermarket fuel pump, injectors and Z32 AFM I believe.

[Lithium]

Not sure what boost level the actuator comes set at but the minimum boost I can run is 0.9 although it still seems to sit at 15psi anyway, max boost is 1.2 with stock internals.

I have a bosch 044 fuel pump and 555cc nismo injectors.

Have not taken it to drags yet but got 270rwkw and not to much lag so should be in the 12s depending on tires?

Awesome - thanks a lot That pretty much covers what I was looking for.

So it drives fairly well like a pretty standard R33 when not giving it some??

[Wazz]

Reedy, Wat rpm range does it spool up and create full boost by i am looking at putting one on my rb20 soon but i havent been able to find out wat rough area it will spool up by i've got the stock rb25 series 1 turbo on my car at the moment and i dont get full boost untill around 4000rpm lil bit after running 14psi lil bit before running 10psi.. so yer any info on spool of GTRS would be helpful thanks

[Lithium]

On WWW.HKS-POWER.CO.JP (warning... in japanese) you can go to the turbos menu, and there is a section called "RB20-25" or something like that, which has a section on the GT-RS and GT2530Kai kits for R32 and R33 GTSt Skylines. It shows boost plots and dyno plots comparing between a stock R33 turbo and a GTRS or GT2530Kai to get an idea of comparative power/torque/spool performance.

The GT-RS at least on paper looks SLIGHTLY laggier than the R33 turbo, maybe ~300-400rpm later at most to reach the same boost level on an Rb25. The 2530Kai looks like its better right through the rev range than the R33 turbo. From what I've seen around the place, the 2530Kai looks like what I'd consider the perfect turbo for a "street tune" R32 GTSt with an RB20DET. Slightly better down low, and much better up high and with higher boost levels than the R33 unit.

I'm just looking for what realistcally I'd have to expect in terms of set up and general driving with one I have no doubt I'll like the full throttle performance of a GT-RS.

[Reedy]

I think drivability is better with tuned powerfc as more responsive and turbo is not to laggy shown in dyno when its set to 1.2bar as it reaches 15psi at 3400rpm and 17psi at 3800rpm.

[carlo]

This turbo is awesome.. It spools up very fast and gives the car some serious punch..

Would be a good idea to get a new fuel pump at least. PowerFC would be a good move.

[Wazz]

Reedy, can you list all your mods please?

is that with stock cams?

thats a bloody nice power band

[Reedy]

My mods are;

-Full 3 inch exhaust

-FMIC

-Bosch 044 fuel pump

-Spitfire ignition coils

-Power FC and boost kit

-Adjustable exhaust cam gear

-Nismo 555cc injectors

-HKS GT-RS turbo kit

-Z32 AFM

-Xtreme billet lightened flywheel

-UAS sports clutch kit

-Tein super street coilovers

-Whiteline front and rear swaybars

-JIC tension rods, front negative upper link, rear adjustable upper link

[Wazz]

nice did the ex cam gear make much difference?

[Reedy]

I did it at the same time as the PFC and turbo and they said they got an extra 5 kw with it.

[Wazz]

ahh k so not really all that much difference but yer i think i might go one of these GTRS's on the rb20 put a set of pon cams in to reduce a little bit of lag.. nice setup

[Interloper]

ahh k so not really all that much difference but yer i think i might go one of these GTRS's on the rb20 put a set of pon cams in to reduce a little bit of lag.. nice setup

thats pretty much what i hope to do in the near future

[Lithium]

What I had hoped I'd be able to get away with is getting a decent fuel pump , a PFC, FMIC and a GT-RS kit and get it tuned on the minimum boost setting - is it fair to say that even if I wanted to run the "minimum" I'd still need the bigger injectors?

[Wazz]

should be good to see wat some people can pull out of the ole rb20's with these GTRS's

had a bit of a mind blank here.. gtrs is ball bearing right? (lacking sleep)

[Reedy]

I've heard stock injectors are alright under 250 rwkw and 1 bar should be under that without cam and coils. You'd also need a Z32 air flow for more boost anyway, also might be worth looking into 2nd gtr injectors as my 555cc injectors max duty are only about 70%.

[Wazz]

i was actualy looking at goin 600cc nismo injectors.. wolf3d (**** that afm off) and yer mods to go along with it