Diko31

Id love to do that, but i dont really want to hop on the band wagon so soon Im pretty sure im gonna need new valve springs soon so i might just rebuild the top end then, get slightly bigger valves and possibly cam. Give the head a wash in an acid bath, and if it doesnt cost too much, ill get it ported just a fraction (if machine shop reckons its necessary) and tidy the bowls up. Get nistune installed, new injectors, new fuel rail+pump. Get the intake machined and possibly chuck on vl turbo extractors I think thats the best way to go about it.

Thanks for the help everyone

Wouldnt mind getting some NA power though Its not like im gonna expecting to get as much power out of it like you would with a turbo. I guess if i have to ill upgrade the bottom end so i can get more power out of it while its NA

So just leave it stock and focus on doing my drift pig up?

@GTSBoyIt definitely looks poxy. And i did want to get a billet purely based on looks...so maybe its the wrong thing to do Billets do look lovely but if it isnt gonna provide more power than what the stock one could already provide, then yeah, theres no point hey

I want to upgrade/mod everything besides the bottom end. I was planning on buy a nistune ECU aswell as a better fuel system as a whole. The intake was gonna be modded or replaced with a billet intake. I have spoken to otaku garage and they said that you cant run a billet intake with stock ECU, and the upgraded ECU is gonna have to be mapped to run a billet intake while staying NA. Ive been reading engine tuning books, and i do understand that wider ports and bigger valves arent always ideal for road use, hence why i dont want big upgrades. But if i can only achieve a max of say 150kw with what you're mentioning, then so be it, ill be happy with that. @admS15 what numbers would that produce do you reckon? I would resort with that, but i do want to do somewhat extensive work to my wagon, it may be illogical, but i dont think thats gonna get me what im sort of aiming for, then again, who am i to say anything, i don't know much at the moment

ill give it my best. Will be a while away. If anyone has any tips or advice on how i should go about a top end rebuild, would be much appreciated! I would like to achieve around 200kw NA for road use and some track use (powercruise) without going to big on the upgrades. Fuel system aswell as the intake manifold will be modded/upgraded aswell as ECU mapping. Id like to maybe get a billet front face intake and get an appropriate ECU so i can get it programmed to run NA. From my knowledge, billet front face intakes are for turbo applications,unless you get the ECU programmed accordingly

Bottom end upgrades are out of question as i dont plan on touching the crank, conrods or pistons until i decide to boost it. I would like to supercharge, but a supercharger is obsolete if the power isnt already there...

So not realistic...proof that ive got alot to learn. I dont plan on rushing, so when it happens, doesnt bother me. I do understand that upgrading fuel system, modding intake manifold and rebuilding the top end is only gonna get me so far, but as to how far it gets me, im entirely unsure. I say 350hp because i genuinely thought itd be achievable with out going to big in the top end, but obviously not. What do you think would be optimum power without running a massive cam and what not, or what do you think is acceptable for what i want to achieve, im staying open minded because compared to the info thats out there, i dont know shit...excuse the french ?

Thats why i need to read up alot, because i dont know what would be an ideal choice for valves and what not. It gonna be for road use mainly, but i do plan on attending powercruises and stuff once its ready. Maybe 350hp at 4.5-5k rpm, not sure if thats realisitic or not, but thats what ive got in my mind. Im taking advice on as i go, so i can understand how i should go about it. i will be constantly referring back to this forum, because i know the point of veiw i have atm isnt a good point to start from So you're saying if im gonna port the head, its probably best to clean the head up, upgrade seats, valves, guides etc?

@Steve85 I plan on going sleeper, but wagons look mint slammed with some shallow dish wheels so yeah? thanks man! @PranK thank God there is, gotta lot of forums to read haha!

Yeah i thought that. I plan on upgrading fuel system and what not prior to doing headwork. I was just enquiring so i can start to get my head around what actually goes into getting better performance out of a head. I do plan on keeping stock cam, or possibly going a wee bit bigger if run out on the cam is out of spec. At the moment im just planning though! I am also not sure if a port is necessary when getting bigger valaves...

Yeah man, heres my old girl ?

So i plan on rebuilding the top end of my rb30e out of a 86 r31. I want to a bit more power and economy. Is it possible to achieve that by keeping the cam stock but replace valves and porting the head? I plan on getting the stock head flow tested so i compare the difference. Not sure how i should go about it. I plan on talking to an engine builder, aswell as reading forums and books for knowledge. Yes i am a rookie when it comes to internal work If im thinking to far ahead, let me know please

New to the forums. Not sure what im meant to say in my introduction. All i can say is i love my r31s and thats probably all ill be asking abouy