Jump to content
SAU Community

Recommended Posts

results are in.

Blue us RB30 orange is rb25. full comparison and nothing else has changed except the bottom end.

turbo is 3076 56t with 0.63 rear... falls over pretty hard and adding more boost doesnt increase it.. so rear is a restriction thats for sure. Need a .82 rear for it.

548970_396306537085122_1736352689_n.jpg

didnt have any issues with the car apart from oil pissing out the catch can due to the sump being 2L overfull... after spewing oil out several times and filling the can its finally reached a happy level where it wont do it any more haha. still a fair bit above the H mark too. i now have a massive mess in the engine bay which i need to clean confused.gif

in terms of power and performance... wow.. its like night and day. can leave it in 3rd in the esses, even if following someone and you have to adjust your line in the entry to a slower one you can back off.. get back on the throttle and it just spools straight away haha. exiting the esses you can shift straight to 4th and it pulls HARD up the straight and just bakes 1 and 2 in 4th. loves it!

have a slight oil pressure related issue... not sure whats going on. have a read here if you care http://www.skylinesaustralia.com/forums/topic/405788-oil-pressure-dropping-when-no-load-on-engine/page__fromsearch__1

all in all... decent shake down. plenty of grip with the rear DW knuckles in now.. not a fan of the front DW knuckles. i wouldnt recommend them to anyone thats for sure. as a drop spindle they are wicked but for big lock with no bind... nope they dont tick that box. I will be cutting and shutting (in a not so dodgy way) and repositioning the tie rod mount on the knuckle so its more in line with my modified knuckles that i do. It should be easy enough to do due to the construction of the DW knuckle as its just made out of welded plate steel. I wont do it before WTAC as theres to much to do and EC isnt a big angle entry track anyway so worry bout it when i get back.

good results

would have expected more kw power with the extra capacity and higher comp ratio

seeing that camshafts alter power band, no chance that changing shafts to suit the 30 while keeping the 0.62 rear would increase power with more psi ?

just a thought

  • 2 weeks later...

WTAC run and done.. just got back 3am this morning so im running low on energy.

full write up coming soon.

25 dollar bottom end loved life. smashed limiter and shredded tyres. Missed out on top 16 battles but won the bottom 16 battles beating the NZ guy who won it last year so reasonable effort!

car's a bit smashed up.. quick vid here

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

    • I don't think the shuffle can damage the turbos. It only happens at low shaft speeds and loads. It's just annoying (to some people - others are tickled by the effect) and it quite possibly reduces spool performance a little bit.
    • Oh dear. The panel beating needs to be done before the filler work. Do you have a photo of the dent before you started? Hard enough to not flex and only hit the high spots?  What do you mean it was just temporary? 
    • Can u check this way it works for power supply?
    • These coils draw 10amps that what i read online
    • I appreciate the detailed explanation, think I understand now. I spent the better part of last night reading what I could about shuffle and potential solutions. I had replaced the OEM twin turbo pipe with an alternate Y pipe that is separated further away from the turbo. The current one is from HKS and I had a previous pipe that was separated even further away, both have shuffle. I had heard that a divider can be welded in to the OEM pipe to remove turbulence, and figure that aftermarket pipes that are more separated would achieve the same thing. From what I read, most people with -10 turbos get shuffle due to their size, though it's a bit less common with -5s on a standard RB26. I think Nismoid mentioned somewhere it's because OEM recirculation piping is common in Australia with -5 cars. It seems that the recommendation tends to vary between a few options, which I've ordered in what I think is most feasible for me:  1. Retune the MAP or boost controller to try to eliminate shuffle 2. Install OEM recirculation piping 3. Something called a 'balance pipe' welded onto the exhaust manifolds. I don't know if kits for this are available, seems like pure fabrication work 4. simply go single turbo My current layout is as follows: Garrett 2860 -5s HKS Racing Suction intake MAF delete pipes HKS racing chamber intake piping hard intercooler piping,  ARC intercooler HKS SSQV BOV and pipe Haltech 2500 elite ECU and boost solenoid/controller HPI dump pipes OEM exhaust manifolds HKS VCAM step 1 and supporting head modifications Built 2.6 bottom end All OEM recirculation piping was removed, relevant areas sealed off I'll keep an eye out for any alternative solutions but can get started with this.  Only other question is, does shuffle harm the turbo (or anything else)? It seems like some people say your turbo shafts will explode because of the opposing forces after a while and others say they just live with it and adjust their pedal foot accordingly. 
×
×
  • Create New...