Jump to content
SAU Community

Recommended Posts

Hey guys, just got an RB25 ball bearing highflow put on my RB20

just wondering how many of you guys have them and how do they go?

like how laggy are yours? Wheres your power range? and how much boost are you running?

Atm ive got mine on 12psi n i dont see it till ~3500-4000rpm but after that it goes pretty well

i havent gotten it tuned yet coz im still looking for some engine management.

its heaps different from the standard turbo since i used to see 12psi by around 3k

i spose a good tune will get it spooling quicker?

Link to comment
https://www.sau.com.au/forums/topic/155293-whos-got-a-highflow-r32s/
Share on other sites

Hey mate I have a hi flow on mine but I have a VG30 rear housing (so it will be laggier then yours), 1st gear I dont really get much boost at all unless I launch the car from about 4 - 5k 2nd gear it comes on strong from about 4500 and really throws you back around 5 - 5500rpm.

It is a LOT laggier then the standard turbo but now that im used to driving it and knowing how to hold my revs etc it doesnt seem so bad at all.

My supporting mods are : Power FC, GTR Injectors, GTR front mount, 3inch turbo back exhaust, and a bosch 040

any other questions you have feel free to ask me and ill try my best to help

PS I made spot on 200rwkw with 17psi

Its a R32 highflow with a VG30 rear housing, the rear housing is whats causing my lag issues, this turbo would much better be suited to a RB25. Nothing I can do about it now anyway I cant afford to pull it off and change turbos or exhaust housings etc so ive learnt to live with it.

atm ive got a 3" split dump/front pipe into a 3" fujitsubo catback and an fmic

i dunno wat kind of management im going to get yet but ive got gtr injectors waiting to go on, gotta get a fuel pump and im looking into some gtr cams to get it spooling earlier.

cant do much about it right now, guess ill just have to live with the lag for a while

Throw an Rb26 Powerfc in to it.

Any half decent workshop knows how easy it is to get it working with the GTST.

Forget the GTR cam's idea UNLESS you are going to have them reground by LukeVL (Tighe cams).

is it rb26? i thought that rb25 PFC was the go for the rb20 without resorting to APengineering ones :D

r32woohoo

I have the same turbo as you and on the RB20det. full boost 19psi is about 4100. boost starts building at around 3000 i am running GTR injectors and pump big fmic, 3" turboback and metalcat.

the car is making 240rwkw and is good to drive once you get used to the lag.

I tuned the stock ECU and it runs perfect 12:1 AFR's

If you want I can burn you a copy of my tune and just modify it to suit your injectors and afm.

pm me if you are interested

Hey guys, just got an RB25 ball bearing highflow put on my RB20

just wondering how many of you guys have them and how do they go?

like how laggy are yours? Wheres your power range? and how much boost are you running?

Atm ive got mine on 12psi n i dont see it till ~3500-4000rpm but after that it goes pretty well

i havent gotten it tuned yet coz im still looking for some engine management.

its heaps different from the standard turbo since i used to see 12psi by around 3k

i spose a good tune will get it spooling quicker?

Exactly what sort of high flow is it? ie. who did it, and what core has gone into it? Using RB25 housings won't be the real issue on lag - the size + trim of impellers will though.

If it's a Garrett core into Nissan/Hitachi housings then there will be ID tag numbers visible. They tell the story on what spec impellers you have. If you can find them, post 'em up.

Both can be used.

Rb26 pfc's are still easy to get where as the rb25's are not. :laugh:

Oh, i wasn't aware that rb25 pfc are getting hard to get. I wonder why?

and to stay on topic: I used to have a R34 Rb25 highflow. all i can say is that HKS GTRS is x10 better...but then i had a pretty average highflow :laugh:

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

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...