Jump to content
SAU Community

Recommended Posts

Well I have finally found the problem to my recent thread on backfires and smoke.. my last cylinder is KAPUT...so now i enter the fork in the road as to rebuild and strengthen my current RB25DET or upgrade/crossgrade to a RB26DETT with either using the current single highflowed turbo I have or using original RB26 Turbos? If I went RB26 way then I would not going AWD but still leave it in RWD.

What thoughts or suggestions do any of you that have done this or known of someone whom has got?

Thanks

Link to comment
https://www.sau.com.au/forums/topic/65622-rb25-or-rb26-in-upgrade/
Share on other sites

RB26 is a very expensive option (have one in my GTST) unless you can fit it all yourself - save your bucks & rebuild what you have.

Yes I know it can be exspensive, but what are the power output options like, I gather you will not gain a substainal difference from just rebuilding the engine? That the RB26 would give a better platform from which to grow into a beast :)

My goal would be to get approx 250-260rwkw from the car. Currently I am at 215rwkw and with the current turbo (just high flowed recently) and the new injectors, pump, stand alone ecu etc I think the RB25 will do the job if rebuilt properly. I think I would be able to get to 300rwkw with the RB25 as well by strengthing the internals with Aria pistons and some Tomei gear?

I do think with 250-260rwkw I will be very happy with as I am still looking at keeping it a streetable car.

do what i did and stroked the rb25 engine with a GTR crank :D Little bit of machining had to be done to block but didnt cost much at all. Also bigger head gasket and 1mm was taken out of the combustion chambers in the head to decompress it down abit :)

do what i did and stroked the rb25 engine with a GTR crank :D Little bit of machining had to be done to block but didnt cost much at all.

for less than 100cc extra, a GTR crank isnt worth the $$ IMO.

better spent elsewhere.

if you only want 250-260, jsut rebuild the 25.

Cost you 7k motor in and out.

RB26 might be a tad cheaper, but then its 2nd hand.

Your 25 will be fresh and if looked after will last for years.

Yeah well they are all good suggestions and if I have a good amount to spend, then I would most likely go all out. However me thinks sticking to rebuilding the RB25 with forged pistons, rods and bolts along with a new engine & head gasket and regrounding the crankshaft to harden it and add new cam gears and valve springs and poncams. This way I am pretty much assured the engine will handle 400+kw and take me into the low 12's with the rest of my setup.

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

    • The nature of my commute has changed. Way back then it was traffic lights all the way, for ~28km. It sucked. When they finally stitched the expressway together I can do a good 15+km of it at a steady 80-100 with no stopping. That alone has gotten me down to flat 10s. Prior to that it was mid-high 10s. I can't remember the delta that I saw when I got the idle down. It was only ~150 rpm, because the idle speed was never terrible, but for the delta in consumption to be noticeable it would have had to have been at least 0.2-0.3 L/100km - which is not to be sneezed at when it comes for absolute free.
    • If you're claiming the issues are not skyline specific, then either the USA is living in the 90s / early 2000s, OR you have the issue of "survivor bias". Which is you're mainly hearing and listening to those with terrible experiences, and haven't found the guys who have cars with good decent builds and no problems. It happens in AU too, that plenty of people keep having issues, and they keep going to the workshops that are known to be shit "because I read on the internet". Even worse, are those who keep posting on the internet as though they know for a fact what something is, when they've never touched/looked at said item in their life, and again are making assumptions, based on something they read, or because it's a certain way in other cars. It's even funnier when those same people debate the facts with the people who've lived and breathed this stuff for over 15 years. Example, I've had someone tell me you can't do something with a Skyline, because they read it on the internet, except I can tell they're wrong, as I did that exact thing back in 2008 with my Skyline.
    • The funniest part I saw, was someone would bitch and moan on FB about something, Andy would be the one to respond, asking for more info, if he could contact them, what the engine setup is, what their config file was, and 95% of the responses were people just going "der! It doesn't work" and Andy going "What doesn't work?" And then going "The firmware!" And they'd go around in circles as no one could ever give information, and Haltech couldn't fault things on the bench, (especially when people wouldn't give any specifics).   Many moons ago, when Andy was back at e420c stage, he reached out to me, and asked me to test different plug and play looms for him (already had an e420c in the car on his V1 PNP loom). And he kept asking me, as I was competent enough to be able to give him some specific feedback on what was/wasn't working, how to replicate the faults etc, and work through things with him. Most people are terrible at answering the questions they're asked, or being able to provide quality feedback other than "it doesn't work".
    • I say it often, none of this stuff is really Skyline-specific per se. But in general there's not a lot of people who actually know what they're doing. A lot of people charging like they do. Agile software development probably isn't the greatest idea for an engine controller.
    • Incidentally, I also put v3 of the tune on the car and did an oil change from 5w20 to 5w40 to see how it affected oil pressure in the mid to high end. I'm still happier with the thicker oil and will stick with it, but clearly the system is happy with 55psi even if I'm not! It's well within the service manual specs...but they are very open
×
×
  • Create New...