Jump to content
SAU Community

RB25/30 Big HP VCT?

klutched

By klutched,
in Engines & Forced Induction

 Share

Recommended Posts

klutched Experienced

klutched

Posted
Posted

Ok so I'm a little bit unsure which path to go with my new build this year... I'm building a 25/30 and looking at GTX42/PTE6870g2/EFR9180 and not sure if I should keep VCT and run 268 9mm or get rid of VCT and run 272 10.4mm. I'll be tuning getting it tuned on my manual box then moving to a glide setup as most stuff I do is mexican highway/drags/roll racing. I still want somewhat of a powerband, will probably only rev it to 8k to stay on the safe side for the hydraulic lifters.

Positives and negatives to both, if i delete vct I'll have to clearance head for big lift, but I won't have to do an external vct oil feed, laggier.

If i keep it gotta run external feed, smaller duration and lift but bring the turbo on quicker? 

Head will be ported with +1mm valves also.

Also those of you who run ross balancers, is the metal jacket ok or should I upgrade to the race series? (A/C retrofit is exy). They rate the metal jacket to 600hp which ill be exceeding but just wanted to see what people are running. Open to other options as well if any.

Link to comment
https://www.sau.com.au/forums/topic/473060-rb2530-big-hp-vct/
Share on other sites
klutched Experienced

klutched

Posted
  • Author
Posted
10 minutes ago, sneakey pete said:

Power ratings on balancers is one of the most stupid things ever in my opinion.

Also, is 268x9 really the biggest VCT cam you can get?

I don't understand them haha people make 600whp on stock balancer but their aftermarket 'upgraded' unit is rated to 600hp? 

What do you run on yours Pete? 

Yup, as far as I'm aware anyway. Im gonna shoot kelford an email and see what they say about a custom vct set.

sneakey pete Grand Master

sneakey pete

Posted
Posted

VCT is awesome, but on an auto making 600kw would want more lift than 9mm, and for actual driving under the pump bigger duration with a lot more lift would be the go. Best is best of both worlds, similar specs with VCT!

57 minutes ago, klutched said:

I don't understand them haha people make 600whp on stock balancer but their aftermarket 'upgraded' unit is rated to 600hp? 

What do you run on yours Pete? 

Yup, as far as I'm aware anyway. Im gonna shoot kelford an email and see what they say about a custom vct set.

Got a ati... 1000 or 800 or whatever the higher spec one is. AC works which is a benefit however its overdriven 33% so need to be careful about it being on or off. Do wonder if i could have gone for the smaller one, on the other hand i'd like to be able to rev it to 9000 for when i'm feeling stupid, and doing launches etc sometimes and I expect that is where it would be a more critical difference.

cams wise, no VCT on the 26 head unfortunately, but I have unigroup 260x11mm cams which seem to be pretty amazing.

klutched Experienced

klutched

Posted
  • Author
Posted

I have emailed kelford to ask if it's possible to run more lift with VCT and what they'd recommend for my setup. 

Yeah small lift and relatively low duration for the turbo size I want to run, little worried 268 wont bring out the full potential up top.

Oh yep, shame ATI dont make a balancer for the 25's.... Ross is the only way to go for me I think.

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

    • Komdotkom
      R32 Gtst - Track Car

      By Komdotkom · Posted

      Good luck on the weekend mate
    • Duncan
      From Japan and back to Europe, my sh*tbox R34 GTT

      By Duncan · Posted

      Must have been an absolute nightmare to drive when the power steer was out, the rack ratio/wheel size/caster is all set up for power assistance
    • Duncan
      New

      By Duncan · Posted

      Welcome to SAU, what are you looking at buying?
    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      I checked the injectors again (1 and 2, since they’re easiest to access) to make sure they weren’t clogged. Even though the entire fuel system had been cleaned, I wanted to be certain. Everything looked clean, so I reinstalled and connected everything. When I started the car to confirm everything was okay, it immediately revved up high, so I shut it off straight away. I checked to see if I’d missed a vacuum hose or something, but everything was connected. On the second attempt, the car ran without the high idle, but I noticed a distinct “compressed air” sound coming from the engine bay. Tracing the sound, I pushed injector #6 forward slightly and the noise stopped — it turned out it wasn’t seated properly, despite the fuel rail being bolted down. While holding it in place, the car idled steadily without stalling and ran for over 5 minutes. At this point, I pulled all six injectors out just in case I hadn’t seated them correctly or dirt had gotten onto the O-rings. Unfortunately, I discovered that I had damaged 3 out of 6 injectors (the OEM 270cc ones) during installation. So yes, this was my fault. Since only the pintle caps were damaged, I’ve ordered a Fuel Injector Service Kit from NZEFI to refurbish them. In the meantime, I reinstalled my new injectors – the car now idles fine for over 15 minutes without stalling. I have not attempted to drive it so far. It’s not perfect yet, as it hesitates when the throttle is pressed, but it’s a big improvement. Unplugging the IACV with the new injectors idles at around 800rpm, even with the IACV screw tightened fully. But this is probably due to tune.
    • hoodedreeper
      Chris' Toyota Mark ii JZX110

      By hoodedreeper · Posted

      I wanted to try and preserve the front bumper as long as possible, they're not cheap and are made to order in Japan. Taking inspiration from my previous K11 Micra build where I made an undertray for the Impul bumper, I did the same for this BN Sports bumper but a little slimmed down.  This time round I only made a 'skid plate' (if that's the correct wording/term) for just the bumper surface area, the Micra version covered the gap like an undertray. Starting off with a sheet of mild steel approx. 0.9mm thick 4ft x 2ft in size. I traced around the bumper, cut it out and cleaned the edges. Luckily I was able to get two halves from one piece of metal In the video I installed it as is, but I've since then I've removed it to spray and add a rubber edging trim. The rubber trim is suitable for 1-2mm and it's a really nice tight fit. The bolts had to be loosened due to the plates being too tight against the bumper, the trim wouldn't push on I used some stainless M6 flat headed bolts for a flusher finish (rather than hex heads poking down), I believe this style fastener is used for furniture too incase you struggle to source some. The corner's are a little wider, but this may be an advantage incase I get close to bumping it  The front grill got some attention, finally getting round to repairing it. Upon removal one fixing pulled itself out of the plastic frame, one side is M8 that fixes inside of the frame, where as the other side is M5. Not knowing I could get replacements, I cut down an M8 bolt, threaded it inside the frame along with a decent amount of JB Weld.  The mesh was replaced to match the bumper. One hole on the bonnet/hood had to be drilled out to 8mm to accommodate the new stud, once the glue had set it could be refitted. I think the reason the grill was double meshed was to hide the horn/bonnet latch (which makes sense) but I much prefer it matching the bumper Bumper refitted and it's looking much better IMO The Youtube video can be seen here: https://www.youtube.com/watch?v=bVZP35io9MA
×
×
  • Create New...