Jump to content
SAU Community

Recommended Posts

Very interested in a comparison between the HKS 25/30, HKS 25/35 and Rb25 hi-flowed turbos!! (http://www.gcg.com.au/Catalogue_Menus/Upgr...pgrade_gtst.htm)

Im also interested in spooling times, mid-range and max power figures on an rb20 from these...

Im guessin the 30 will spool quicker than the 35 but not have the same peak power ratings? Interetsed to know where the GCG hi-flowed rb25 turbo would come between these two turbos.

Anyone know??

Also another thought... what about a HKS GTR-S in terms of lag and max power?

GT2530 results update

http://www.skylinesaustralia.com/forums/sh...ght=2530+Hiflow

HKSGT** head to head with GCG H-flow

http://www.skylinesaustralia.com/forums/sh...ght=2530+Hiflow

RB25 turbo ugrade, ALL DYNO RESULTS

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

Rb25 Hks2535

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS GT2530 turbo question

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS 2530 on RB25 Wrap Up

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

[iNFO] Before & After GCG Turbo Hi-Flow

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

GT-RS or high flow?? opinions??

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS GT-RS Installed

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

Fitting a hks 2530

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS GT2535 - Optimum efficiency band ?

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

The Ultimate Turbo for your RB25DET

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS 2540 on RB25DET result

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS 2530 Dyno Results

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

Hks Gt2530

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

high flow or aftermarket turbo for r33

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

What boost to run for a HKS 2530

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

GCG or HKS 25** Turbo

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKS 2530 on a R33???

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

HKSGT2530 Results on RB25.

http://www.skylinesaustralia.com/forums/sh...hlight=HKS+2530

From what im reading im getting that impression too..

220rwkw on a tired rb20 (170,000kms) and 265rwkw on a neo rb25. Shows the turbo can produce the goods and has plenty of scope left! Dont see many 2530s making more than 300rwhp really.. this turbos done 355rwhp on that rb25! So probably 320+rwhp on a good condition rb20.

Although expensive i think i will go with my first idea the GCG 450hp hi-flow...

and a few other little goodies...

Im personally looking for anywhere around 300rwhp out of my rb20 with a turbo thats not TOO laggy... the GCG rebuild looks the go as it can push alittle more hp outta it where as the gt2530 cant. Thought about the 25/35 but this seems too laggy..

Whats ur thoughts dude?

and a few other little goodies...  

Im personally looking for anywhere around 300rwhp out of my rb20 with a turbo thats not TOO laggy... the GCG rebuild looks the go as it can push alittle more hp outta it where as the gt2530 cant. Thought about the 25/35 but this seems too laggy..

Whats ur thoughts dude?

Id go a stock hi-flo turbo for sure with a set of tomei poncams.

gt2530 for the rb20. high flow for the rb25.

"i think the hiflow makes more power and also spools up quicker"

i dont see why the highflow would spool up quicker, the 2530 spools pretty quick! Id actually say the 2530 would spool up quicker, going on runs ive had with garret equivalents.

I believe a 2530 on an RB20 would be an OK upgrade.

But on an RB25 I have found a small problem, it boosts up at cruise (100 kph) as soon as I squeeze the throttle. This is a bit annoying when driving along any freeway with hills, I squeeze a little bit to get up the hill and it boosts up and accelerates too much. I back off so as not to go over 110 kph, then I slow down too much. It is hard to keep at a constant speed and it definitely uses more gas.

The GCG ball bearing hi flow doesn't do that, you need to give it a bit more on the throttle to boost up the hills, I don't have to flatten it or change down, just an extra few mm of pedal travel. It is so much easier to keep at the set speed and it uses less gas as a result.

Since we race interstate 9 times a year, this is important for my usage patterns. Maybe not so for others.

:P

SK thats right about the quick boosting up, and i agree this can be annoying when you want only a bit of acceleration rather than a surge, but it can also be fun and give the car an effortless feeling of power from boosting point thru midrange, eg. for overtaking you just need a tiny bit of throttle and you whoosh by.

SK thats right about the quick boosting up, and i agree this can be annoying when you want only a bit of acceleration rather than a surge, but it can also be fun and give the car an effortless feeling of power from boosting point thru midrange, eg. for overtaking you just need a tiny bit of throttle and you whoosh by.

Yeh, but how much is " tiny bit of throttle"? I am going to waste a bucket load of fuel if, every time I move the pedal ~1mm, it boosts up. I reckon ~5mm is good, that gives me ~4 mm to adjust speed, without surging away. After all I have ~50mm left to demonstate effortless acceleration.:)

Each to there own.With a RB20 we need all the poke we can get :) (Don't worry Roy I love the RB20)

I'd rather squeeze the pedal a little and for it to take off but it aint going to happen.So the RB25 is that much of a different animal?

its just that i already have a gcg hi-flowed turbo on my rb20, and was just wondering if a 2530 is better....i just want a good power result, the car has a hks front mount, apexi 3.5inch exhaust (turbo back), bosch 040 pump, 14psi, the stock computer chipped in japan b4 i got the high flowed done to run heaps of boost. stock injectors.....i just want to know how to get more power with this turbo...im currently lookin for a power fc and a set of poncams and injectors...will these parts give me alot more power than it has now or would i just expect a little bit?

sry for so many questions

its just that i already have a gcg hi-flowed turbo on my rb20, and was just wondering if a 2530 is better....i just want a good power result, the car has a hks front mount, apexi 3.5inch exhaust (turbo back), bosch 040 pump, 14psi, the stock computer chipped in japan b4 i got the high flowed done to run heaps of boost. stock injectors.....i just want to know how to get more power with this turbo...im currently lookin for a power fc and a set of poncams and injectors...will these parts give me alot more power than it has now or would i just expect a little bit?

sry for so many questions

What sort of hi flow? There are hi hi flows and low hi flows.

I have a GCG Ball Bearing Hi Flow that flows enough air for 265rwkw on an RB25DET at 1.4 bar with Tomei Poncams, Std R33GTR intercooler, split dump, 4" cat, 3.25" exhaust, Nismo injectors, Std R33GTR fuel pump, Power FC and Z32 AFM. It has more power EVERWHERE than when it was standard.

I have not been able to get within 30 rwkw of that with a 2530, but it might make a little more down low, not much I suspect.

:)

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, yes, every CU on the bus is available via the Consult port, but whether the scanner you are using is capable of talking to the TCU, the ABS/TCS modules, etc etc, is what is at question here. Many of them are only for engine codes. So, if you have one of those, you won't know if the ABS is having a bitch.
    • That's now. R chassis Skylines come from a time when the tolerance in the ADRs was a bit more....slack. My car, on 235/35-17, which is damn near the exact same size as the original 205/55-16, is pretty much bang on correct indicated speed across the whole legal range. That's demonstrated with constant speed run over 5km, and GPS speed. It's just the luck of the draw. My particular speedo head has to be the thing that is "calibrated" that way, because everything else (the diff ratio, the gearbox and the speedo drive**) are all same same as most other Skylines. **OK, so the speedo drive is a Navara unit to drive the R32's cable, not the electronic unit than an R33/4 would normally have with teh same gear on it. Otherwise, I applaud your OCD tendencies, and I would do the same if I needed to.
    • Not too sure, I believe the Nissan consult port does everything? Also just filled up the reservoir to full and the light is still on. The float seems to move up and down fine.
    • The speedo's can be very conservative, when my Mazda NC MX5 speedo is showing 118kph, the GPS, and a calibrated radar.... cop mate.....hits me at around 110kph +/- 1 or 2 kph, and that is on a 215/45 17, stock tyres size is 205/45 17 as well, so weirdly conservative with stock tyre size When my Commodore speedo red 116kph GPS had me at 110kph on 255/40 17, so again conservative Google says manufacturers need to set the speedo from 4 to 10% slower than actual road speed.....for safety.....and compliance  After doing some offset and clearance measurements to see what can fit the NC on 17x8 +40, without guard rolling or rubbing anything at my current ride height, I've decided that when my tyres are toast, I'm going to fit 225/45 17 and see where that gets me IRT actual speed of my speedo and GPS/radar From the online calculator I should be still be doing around 5kph under an actual 110kph when the speedo is showing 110kph My ADHD requires that when I'm doing 110kph on the speedo, that the actual road speed is actually really close to that, and not alot slower And going from 205 to 225 still keeps the car within the %/mm allowable in the NSW vehicle rules and regulations, which is nice, as long as I'm looking at the latest version that is.....LOL https://www.nsw.gov.au/sites/default/files/2021-02/RMS-13.464-Light-vehicle-modifications-Vehicle-Standards-Information-No-6-November-2013.pdf
    • Take the value it measured as, and pick the closest range available that is above the reading on the screen.   Also, no point just testing the coils. Read what has been said again. You need to test all your wiring, everything.
×
×
  • Create New...