rb-de ITB madness thought

[slideways]

so im here sourcing information reguarding rb25de(t) and rb26de(t) interchangable parts. so here is what ive been trying to piece together but needing confirmation on. want to eventually build an na rb itb engine, so i have a few questions on engine specifications and interchangable parts.does the rb26dett intake manifold w/itb fit the rb25 head. reguarding the rb26dett block and rb25de head fitment, are there any issues doing this.

thought process of possible parts to put together.

-rb25de head-rb26det block-rb26dett itb/surge tank

specification?'s-reguarding heads, which heads are best used for an NA set up

-reguarding blocks, which block is more balanced and suitable for high revs

from here i can decide which parts will be pieced together. though it sems i am relying on you guys for information i', just a NOOB to the rb world with limited information and sources for parts. if you could shoot me some weblinks with knawlegable information pretaining what i am intrested in doing that would be great. thanks for yout help.

brandon

[krayton]

from what i recall, the rb26 will not bolt up. would take some modification. i recall blitz making something for their drift car that they were able to put it on. but they later switched backed to the over the top intake manifold.

dont get me wrong, i like the idea. sounds fun, but RBs are such big engines, wouldnt u wanna do this on a SR or KA? being that your not gonna have all that power as a turbo to be pumping it?

just curious is all why your going this route. if u really want to i still say try it out. would be neat to see

[eh?]

That's a really big waste of time,money and a RB26 block...A VQ30 or 35 will make a better NA motor.

As for your questions: no the RB26 itb will not bolt onto an RB25 without an adapter plate which is sold in japan. The RB25de (?????) head will bolt to the RB26 block. However the RB25 uses smaller head bolts so the bolt holes will need to be opened up to 12mm to accomadate RB26 bolts/studs.

[NightKids2]

If you go through with it, Ill buy your RB26 head =)

[slideways]

i appreciate your views and oppionions. for me this is not a PLAn just a thought. but here is where i am sourcing this from so you can get an idea of what i am seeing.



i know it may be a waste of money, but adding up cost of parts to put this together is under 2k from my resources adn connects.

i can get the block for 700, the head for 500, the itb setup for 500 power steering pump,altornator and belts for another 2-300.

other parts i havent put into facotor are headgasket, timing belt and other gaskets needed to put it together. but since you have confirmed the heads and blocks arent interchangable.

so im here asking for more info, what are my options for making an NA rb besides going full rb25 head and block w/adapter for rb26tt ITB's?

[krayton]

^wheres the lil hump on that rb25?

[eh?]

so im here asking for more info, what are my options for making an NA rb besides going full rb25 head and block w/adapter for rb26tt ITB's?

Just get a full RB26. The problem with the RB25 head is the weaker valve springs and the hydraulic lifters. I wouldn't want to rev the stock RB25 head over 8.5k.Or get a RB30 block and a RB25DE head if you don't want to rev over 8.5k.

[slideways]

that s for your support guys.

i was reading some things on the rb30e block and 25 head but i really want to run the itb setup. i have a few fireds with 20v's in their hatchis and one guy here who has an itb ka they are sick. kind of out of hte turbo thing. i mhave to look at this more realisticly and go with what is available and is within my budget since i can nowhere find rb30e blocks not rb26 heads.

rb30e block+rb25head isnt good over 8.5 grand, were talking stock components right? not with aftermarket valtrain?

explain your statment so i can better understand what you m eant. thanks

brandon

[eh?]

rb30e block+rb25head isnt good over 8.5 grand, were talking stock components right? not with aftermarket valtrain?

explain your statment so i can better understand what you m eant. thanks

brandon

Limited by oil pump/ oil drainage, also going with solid valve lifter is really cost prohibitive.But what's with the obsession with going NA?

[slideways]

not soo much of an obsession. i previously owned an s13 with mildly built ca18det, now before anyone comments on the engine and how crapy they think it is you should first look into the build before judging its potential.

i had hte following done to it.

hks gt2510 turbomines ecuz32 maffmicfull turbo back and 15 psi

car made closed to 245whpcar weighed in a litle under 2600 lbs.

hung with my friends fully built 300hp sr20 and beave just about every honda in my area. b18, k20 you name it, its been in my rear view so its potential was close to what an sr is compared to.

really loved the turbo engines coming from a ka boy, but i missed the low end, the easy maintenance and i think for me to build an na rb would get me where i want to be.

something reliable and simple to work with is what i am aiming for. not nesecarily the rb30 idea but something with revs and plenty of raw power.

this is an infiniti m30 project if you are wondering.

[eh?]

Have you driven an RB before? The RB's (Except maybe the RB30) don't have a lot of low end torque. For what you want a VQ is your best bet. I've driven a 350z with I/E and it felt like it had more low end than my rb25 with t3/4 13psi.

[slideways]

yeah ive driven rb20det in an s13, compared to my ca and other sr's ive swapped th ey have far more low end torque.

i could only imagine an rb30de.

vq and vk motors will cost me a serrious arma nd leg to come by. i can get ahold of blown blocks for free. we/ll see,

[sean8564]

that picture is of a Rb25 DE they do not have the rear hump on the valve cover and that kit is like a toda ITB setup from japan you can find them at the autobacs store in japan for like 198,000 JPY was what i saw a set up go for at the local up garage in kanazawa Japan

[27RB240]

This might sound kinda stupid and all, but in my opinion, if you wanna go NA, and your want to swap, just get a SR20DE.............I mean you can find parts for it, its alittle bit better than the KA, and I heard of one guy having +270hp on a built one.......Unless you are trying to get creative and using different parts from different motors and stuff, but what you are saying isnt too bad, I would like to see it also............

[BoostFab]

^wheres the lil hump on that rb25?

that's a RB25DE my friend

if you're going NA....just stick with the KA. not doing the rb26 any justice not boosting it .

[sean8564]

why i was reading in a option magazine that a N/A Rb26 out dose a mildly modified GTR in a road course by mildly im mean a 485 Hp GTR Vs a 320 HP N/A GTR and it did not do so well in the straight away but in the corners it was gone

[95silvia]

i have a rb25de sitting in my garage I have been looking for a ITB set up cheap for the last 4 years. I wanted to put it in a 240z. any way if you find a good deal on a set and decide to pass post it up. im actually thinking of 3 sets of duel 44mm mikunis like the ricks auto one. anyway sounds like most of the others dont likee it but i feel ya... cjex

[slideways]

is it possible to use rb25 ecu when doing this hybrid conv? or willa stand alone be nessecary for this.

i realy want to look into what throttle body set up that car is running. he runs an m30/nissan leopard site in japan but i need someone to translate my questions from eng. to japanese. anyhow ill beb ack withmore info to back up my decision / thanks for all your time and responses.

brandon