Brentmcd12

do u goto ur mechanics and they use a controller to advance ur timming ?? after reading the service manual it says u need a diagonists controller to update ur timming ?? so only a mechanic can do this ? im pretty sure my 25de is running rich because the exaust (extractors hiflow cat 2.5 catbak + hotdog + supercat cannon it pops and splutters when u back off the throttle or gear change ?

okay its a VCT head... what year model ? is the VCT connected ? i cant see the oil line ?? so the compression would be 10:5:1 with these forged N/A pistons ? i have a wold 3d v3 to wire up... what else does it need ?? i am in sydney and could drive up with a trailer...

ahhh keen as ! will get back to u with more info!

how much would u say a intake and exuast side port n polish would cost ? but like keep in mind that i dont want it heaps flow tested n all that other crap just like a basic one...

Okay! so it has taken me 1 entire month and a lil longer to read through this ENTIRE THREAD!! so ! i have 93 RB25DE VCT in my R31 skyline.. i have a RB30 block all stripped apart and ready to go for a acid bath... i will be usuing the 25de pistons so i should get around 10-5-1 comp ? i am usuin tomei pon cams type b with exaust side adj cam gear... also buyin harder valve springs and valves i will have my VCT connected and working.. i will be usuing the RB25DE oil pump with the tomei oil restrictor... i have a N1 waterpump ummm std injectors DE afm extractors custom 3" intake 2.5hiflow cat back exaust will be eventually tuned on my wold 3d V3... just need a loom for it.. i will get back with all the prices i have been quoted on for the gasket kit n piston rings n main bearings n all the other build parts... anything anyone else can reccommend while everything is out and i am doing this conversion ? it is staying NON TURBO... RB30DE cheers.. brent

it wasnt that easy !! anyywayss i now have the block apart stripped off everything... its going in for a acid bath and clean and then the build is going to start... im pretty sure its gonna cost me around 3grand...

if i can just buy new valves and springs i will... if it is recommended with the camshafts im getting... i have the exaust side adj cam gear already this build is becomming very expensive

so i DONT need the intake cam gear then ? ill have to find some valve springs to buy from somewhere if u guys think its worthwile... im still unsure about port n polish because to get a place to do it will cost a fair bit extra.

well i just need the intake side.. do u have a link or where to buy ? im still confused over the turbo and non turbo issue.. i havent decided if i should get harder valves n springs... because it will be N/A but will this make it rev harder?

i pmd bass juny for a intake cam gear but he hasnt replied

im not goin to worry about any of that... maybey the balancer if u can show me where to buy them..

im trying to work out exactly wat i need to do for the VCT setup and the oil n high pressure feed

so even tho they are turbo cams they still work fine on the non turbo 25DE ?? - type b sounds good if they will work my car is staying N/A so i cant use adj intake side cam gear only the exaust side gear ? also been looking at the Trust - Greddy - Clear Cam Cover To Suit RB26DETT engines will fit with some modification anyone know ??

cheers for the info guys... im guessing after i press check out i can select wheather i want Type A or B on Nengun ? havent got that far yet i will be usuing 25de pistons in the 30e so compression should be 10;5;1 ? EUG.. i have exaust side cam gear... looking at getting intake side. as well... from bass junkey ? i have a wolf 3d v3.. im not going to worry about a port and polish.. its just going to cost too much.. i asked about it n they said depends wat u want out of it... i just want bottom end torque with enough top end.. 7000rpm sorta thing yeh my rev limiter is 6200 :S # oversized valves? - while ive got the head off do u reckon i should upgrade ? - i might go turbo in a few years... # upgraded valve and valve springs - same as above... im going to be doing everything at once... not worth wasting the money doing bits by bits... just trying to find a mechanic that can help me mod the block and head to get it all to fit.. - re vct and - oil lines...

Tomei Poncams Part NO: 143020 AU $ 733.86 ECR33 Series 1 (RB25DET) - Duration: IN,EX 256 Lift: IN,EX 8.5mm i have a 93rb25de... i will be making a RB30DE the 30de will make enough torque so i want something that will give me midrange to topend... this is from nengun.. Generally, engine tuning is to modify the torque characteristic of engine by changing cam duration timing and height of the cam lift, so as to gaining maximum torque and horse power. However, when tuning the engine strictly, it should be carried out with the idea of securing effective area of the valve not only by duration timing and height of the cam lift, but also by through improvement of its intake efficiency. High valve lift allows huge amount of air to flow in, yet it mechanically damages the system and gains friction loss. Also, wide cam duration will deriver great power at high RPM, but it gives rough engine character at low RPM too. Tomei have worked to get an ideal well-balanced profile of camshaft and succeeded to give it 1.3 to 1.5 times more effective area than regular camshafts Tomei have been developing and producing their original camshafst ever since TOMEI established. Still today, they are providing high performance camshaft to many racing teams and winning lots of titles. Type A In order to get stable idle and raise low-mid RPM torque, we set the duration of EX camshaft shorter. Best suit used with stock turbine or N1 turbine. Type B By giving longer duration timing than type a, it eables to raise both response and peak power at the same time, even with mid-large sized turbine. WHAT ELSE IS THERE THAT I SHOULD GET IF THIS IS WRONG ??

okay well i got it for $500.. do u think i should re sell it and look at getting something else ? or can it be upgraded ? i have the V4 Software...

is that good or bad ? i know its heaps old but will it still work okay ?

sorting out my engine build first then ill get it installed

ah k well maybey because mine is in a R31 the tacho reading might be wrong.. yeah true with the gearing but similar stuff at 100kays... 5th to 3rd.. again.. im doin RB30DE very soon... wat i was going to ask is... what series head do i have its a 93 RB25DE the afm has 4 wires if that helps is that S1 or S2 ? yes it has VCT... i want to buy camshafts of Nengun i belive its cheaper than just jap... which ones are good for midrange power ? keeping in mind it will be for RB30DE..

after several weeks of alot of reading up to page 120 of that thread and alot more info... i have a 89 skyline block... now i was was wondering what series head do i have its a 93 RB25DE the afm has 4 wires if that helps is that S1 or S2 ? yes it has VCT... i want to buy camshafts of Nengun i belive its cheaper than just jap... which ones are good for midrange power ? my build will start as soon as i get the VSR gasket kit... ill be usuing the 25De pistions as well.. im also ordering a Oil restrictor...

is 6200 the rev limiter for the 25de ??? coz thats when mine bounces back.. i thought it was 7500 ?? the engine needs wayy more torque is crap at speeds goin from 5th to 4th just to speed up and usuing 3rd to hold power... anything under 3000rpm is terrible

i might get it installed sometime this week !

might be interested..

bump ! can any 1 come n help me install it ?

so if i upgrade my camshafts say pon cams or watever and i use adj cam gear do i keep my vct ?