Jump to content
SAU Community

Recommended Posts

8 minutes ago, tridentt150v said:

Would twin cam work better?  ie anRB25de head?  It has to breathe better surely?

 

That's a seriously more sensible option than spending any money on the 30 head. I guarantee people who want to be different are deluding themselves. There's a reason basically no one bothers with an na rb30, especially spending money on it

  • Like 1

Undoubtedly twin cam would be better, id go with a 26 head, ive found a thread on building a rb30 with a 26 head, but i havent read it. Its what i do want to do down the track but if a rebuilt 30 head is gonna cost as much as a 26 head conversion then yeah, im gonna go with the conversion. You both clearly know more than me so if you think its more sensible to go with a 25 head rather than a 26 head then obviously im gonna take your advice and go with a 25 head. not sure if they made NEO 26 heads but a NEO head would be the way to go regardless, yeah? 

I also do plan on converting both my wagons to twin cam so yeah, illogical to work towards anything but that. 

 

And again, i appreciate your help and any help that is given in the future! Thank you

  • Like 1

And if you think its more sensible to work towards the head conversion rather than working the standard head, then advice is taken! As i said, twin cam conversion is what i want to do with both my wagons down the line so maybe its best to just start there 

Seriously, unless it has to stay NA, DO NOT DO ANY WORK ON THE ENGINE. . . . NOTHING.

If you want it to be fast, put a turbo on it. Case closed. If you want to be different and fast, put a supercharger on it.

An engine conversion to a LS1 would make more sense than doing anything at all to an NA RB30.

  • Like 2
  • Thanks 1

You made me laugh with that last comment hahahaha ?

Well to be honest, i havent got a budget in mind because everything's gonna be happening over time. And im not saying within a 6 - 12 month period. I dont value money like most people, so i dont feel as bad when im "wasting" it...plus cars cost alot when modding and upgrading "properly", so theres that

I have a feeling top end is gonna need new standard gear soon, i can here a tick coming from the rocker cover and i know its not the usual tick that rb30s are prone to...so i might just ditch the NA aspect. Im feeling a supercharger in my daily. Not sure how much the stock internals of a rb30 can withstand but i hope its a decent amount. 

9 minutes ago, Diko31 said:

I dont value money like most people, so i dont feel as bad when im "wasting" it...plus cars cost alot when modding and upgrading "properly", so theres that

In that case, either piss or get off the pot. Don't stuff around. Build a 10000rpm screamer. Full house OTT polish and balance everything to the nth degree. 6 throttles with open ram tubes, handbuilt extractors. 300° cam, 13mm valve lift, 11:1 compression and E85.

12 minutes ago, Diko31 said:

I have a feeling top end is gonna need new standard gear soon, i can here a tick coming from the rocker cover and i know its not the usual tick that rb30s are prone to

These things have hydraulic lifters. Just sayin'.

13 minutes ago, Diko31 said:

Im feeling a supercharger in my daily. Not sure how much the stock internals of a rb30 can withstand but i hope its a decent amount.

This would be a fine way to waste money. No supercharged engine is ever as good as an equivalently turbo'd engine, but it is a different sort of fun. Noise + insta-boost is always fun.

10 minutes ago, Diko31 said:

If it dont cost too much, ill see how much it is to shave a mil or 2 off the head to increase compression but im pretty sure that would involve shorter valve stems 

Not sure how shaving the head means that you need shorter valve stems. Are you thinking about the right things? It's not like it's got pushrods. The cam moves up and down with the head, and everything in it, no matter how much you chop off the bottom.

10 minutes ago, Diko31 said:

Higher compression means the engine will need more air flowing through into the chamber, yeah?

No, higher comp means it will make more power. The swept displacement remains the same (unless you bore &/ore stroke it). The head flow remains the same (unless you do something to the head &/or cam). So, the air flow will remain essentially the same. It's just the extra compression drags more power out of the same amount of fuel and air.

9 minutes ago, Diko31 said:

Ive got a spare rb30 just laying around to so ill just build that into a rb26/30 

An NA 26/30 sounds like a good idea. But a 2JZ swap is probably more interesting.

7 minutes ago, Diko31 said:

Also, thank you for havin a good yarn to us about it

No problem. I'm not actually out to stop people from having fun modifying stuff - but it is sometimes necessary to mention where efforts are wasted vs. where efforts will return benefit.

  • Thanks 1

Yeah nah, i wont be doing work like that at this stage. Maybe in the far future when ive got drift skillz

Okay so hydraulic lifters dont wear out then im guessing

Thats why i said id supercharge my daily. Cause i love the sound and the concept over a turbo. My driftpig will be turboed because well, they provide alot more power than a supercharger

Wait yeah, i thought that through wrong, valves arent at max lift when pistons are at tdc ?‍♂️

Okay so ill definitely be shaving the head. Do you reckon advancing the timing a couple degrees would be worth while, or just leave as is?

I want to build an NA engine because i want to see how much power i can get out of an NA rb. Not many people do it, and i completely understand why, but boy do i love my rb's

I know youre not man, hence why im acknowledging what youre saying and taking your advice with most of what youre saying. But when it comes to how i want to boost my daily, whether super or turbocharged, its pure personal preference. i now realise though, after listening to what youre saying, boosting is the smarter thing to do.

Im not sure about you either, but the sound a worked NA rb30 makes, when its screaming off its dick, sends shivers down my spine 

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

    • Update 3: Hi all It's been a while. Quite a lot of things happened in the meantime, among other things the car is (almost) back together and ready to be started again. Things that I fixed or changed: Full turbo removal, fitting back the OEM turbo oil hardlines. Had to do quite a bit of research and parts shopping to get every last piece that I need and make it work with the GT2860 turbos, but it does work and is not hard to do. Proves that the previous owner(s) just did not want to. While I was there I set the preload for the wastegates to 0,9bar to hopefully make it easier for the tuner to hit the 370hp I need for the legal inspections that will follow later on. Boost can always go up if necessary. Fitted a AN10 line from the catch can to the intake hose to make the catchcan and hopefully the cam covers a slight vacuum to have less restrictive oil returns from the head and not have mud build up as harshly in the lines and catch can. Removed the entire front interior just shy of the dashboard itself to clean up some of the absolutely horrendous wiring, (hopefully) fix the bumpy tacho and put in LED bulbs while I was there. Also put in bulbs where there was none before, like the airbag one. I also used that chance to remove the LED rpm gauge on the steering column, which was also wired in absolute horror show fashion. Moved the 4in1 Prosport gauge from sitting in front of the OEM oil pressure gauge to the center console vents, I used a 3D printed vent piece to hold that gauge there. The HKB steering wheel boss was likely on incorrectly as I sometimes noticed the indicator reset being uneven for left vs. right. In the meantime also installed an airbag delete resistor, as one should. Installed Cube Speed premium short shifter. Feels pretty nice, hope it'll work great too when I actually get to drive. Also put on a fancy Dragon Ball shift knob, cause why not. My buddy was kind enough to weld the rust hole in the back, it was basically rusted through in the lowermost corner of the passenger side trunk area where the wheel arch, trunk panel and rear quarter all meet. Obviously there is still a lot of crustiness in various areas but as long as it's not rusted out I'll just treat and isolate the corrosion and pretend it's not there. Also had to put down a new ground wire for the rear subframe as the original one was BARELY there. Probably a bit controversial depending on who you ask about this... but I ended up just covering the crack in the side of the engine block, the one above the oil feed, with JB Weld. I used a generous amount and roughed up the whole area with a Dremel before, so I hope this will hold the coolant where it should be for the foreseeable future. Did a cam cover gasket job as the half moons were a bit leaky, and there too one could see the people who worked on this car before me were absolute tools. The same half moons were probably used like 3 times without even cleaning the old RTV off. Dremeled out the inside of the flange where the turbine housing mates onto the exhaust manifolds so the diameter matches, as the OEM exhaust manifolds are even narrower than the turbine housings as we all know. Even if this doesn't do much, I had them out anyways, so can't harm. Ideally one would port-match both the turbo and the manifold to the gasket size but I really didn't feel up to disassembling the turbine housings. Wrapped turbo outlet dumps in heat wrap band. Will do the frontpipe again as well as now the oil leak which promted me to tear apart half the engine in the first place is hopefully fixed. Fitted an ATI super damper to get rid of the worn old harmonic balancer. Surely one of the easiest and most worth to do mods. But torquing that ARP bolt to spec was a bitch without being able to lock the flywheel. Did some minor adjustments in the ECU tables to change some things I didn't like, like the launch control that was ALWAYS active. Treated rusty spots and surface corrosion on places I could get to and on many spots under the car, not pretty or ideal but good enough for now. Removed the N1 rear spats and the carbon surrounding for the tailpipe to put them back on with new adhesive as the old one was lifting in many spots, not pretty. Took out the passenger rear lamp housing... what do you know. Amateur work screwed me again here as they were glued in hard and removing it took a lot of force, so I broke one of the housing bolts off. And when removing the adhesive from the chassis the paint came right off too. Thankfully all the damaged area won't be visible later, but whoever did the very limited bodywork on this car needs to have their limbs chopped off piece by piece.   Quite a list if I do say so myself, but a lot of time was spent just discovering new shit that is wrong with the car and finding a solution or parts to fix it. My last problem that I now have the headache of dealing with is that the exhaust studs on the turbo outlets are M10x1.25 threaded, but the previous owner already put on regular M10 nuts so the threads are... weird. I only found this out the hard way. So now I will just try if I can in any way fit the front pipe regardless, if not I'll have to redo the studs with the turbos installed. Lesson learned for the future: Redo ALL studs you put your hands on, especially if they are old and the previous owners were inept maniacs. Thanks for reading if you did, will update when the engine runs again. Hope nothing breaks or leaks and I can do a test drive.
    • No those pads are DBA too  but they have colors too. I look at the and imo the green "street" are the best.
    • I’m not sure what happened I told them about sonic tunes free OTS tune and the next the I know .. I was booted..   To funny 
    • Yea - I mean I've seen my fuel pump which is decades old and uh, while I'm not saying this with real knowledge... but I sure get the ick at using anything in the fuel system that produced the state of that pump. Many years ago I went through multiple pumps (and strainers) before I dropped the tank to clean it out with extreme violence. I'm talking the car would do maybe 50km before coming to a halt, which resulted in me cleaning out the filter with some brake cleaner and going on my way. None of my stuff ever looked like what came out of your fuel tank. I don't think I'd be happy with it unless every single component was replaced (or at least checked/cleaned/confirmed to be clean here).
    • I'm not going to recommend an EBC pad. I don't like them. Just about anything else would suit me better. I've been using Intima pads for a while now.
×
×
  • Create New...