Na Pistons

[unarmed_skyline]

i got a mate who works for nis-pro and his is possibly thinking of building me up my engine free labor

so he can learn some more stuff and im trying to find some pistons and pricing and have had no luck

I have a series 1 r33 gtss25 non turbo and looking at doing an Rb30de high comp build up.

Im not sure where i can find some light weight high comp pistons thou can anyone help me??

hoping for a nice built up, thinking of high comp engine 3lt bottom end, pfc, cams, mabye light weight rods, most likely hex throttles with trumpets. extractors hoping for mabye 150 kwatw

[BADR33]

you can use your rb25de pistons and you will get a 10.5:1 compression with stock headgasket. if you want more compressoin deck the block 1mm as the pistons sit 1mm from the top due to the higher pin hight on rb25de pistons.

otherwise you will probly have to look at getting custom pistons as there is bugger all tuneing for NA RBs

with the power fc you would need the dejet kit thingy so it can work with out an AFM.

im looking at the hex throttles for my car right now... if you know of somewhere you can buy them let me know!

well trying to find some! then ill probly be using a LINK ecu as you dont need a AFM and its pretty cheep.

there was a guy in NZ who built one that was 3.1ltr cus he over bored it. greddy side pleninum, 3" exhuast, fuel pressure regulator and a couple of other mods but he wasnt running VVT and he got 139rwkw before being tuned down to 130rwkw. but that didnt have alot of torque from what i was told. 150rwkw is possible. you will just need the right mods.. my 123rwkw rb30 is plenty of fun and its amazing how meny people are suprised by the torque mine has.. and all these guys are coming from light weight modded turbo cars...

so you should either use a RB26 head or RB25DE with vvt as with the NA vvt is worth it.. well i think it is. RB26 would be easyer and probly a better idea as you get solid lifters, plenty of aftermarket cams to choose, better flowing head, 6throttles.. all you would need is trumpets and extractors..

[fatz]

100 hp shot of noss

cheaper and more dun

[BADR33]

you speak like a man who hasnt been in a rb30de powerd car..

sure nos is fun when your wanting to thrash it. but how long will it last? how often would you have to fill it up? plus its illigial to use on the roads?the rb30 is handy all over the show.

[unarmed_skyline]

yeh the hex throttles are hard to find but im on the lookout might have to get some sent over from japan. im looking at using a rb25de vvt head decking the head a mm sounds like a good idea, although ill lookout for an rb26 head and look into that as well it might give me that extra power i want plus with the 26 head i wouldnt have to lower the engine and i can still keep my all loved sway bar.

for the rebuild what exatly will i need??

i know ill need pistons but prob just use the stock 25 ones,

shot peened rods (or would using gtr rods be ok if i got an rb26 head) or lightened rods

big end bearings

vrs gasket set

ill prob get a complete vl series 2 engine as i got a mate selling one

Computer link will probably be a better option if i go with thrumpets

extractors

timing belt

then extras being cams trumpets and any other goodies i think of.

Do you think the gtr head will be a better preformance option?? compaired to decking the na head?? will the gains justify the cost, as ill have the intake on the 25 head ported and polished so i should flow pretty well.

it sounds like your happy you built up urs,

im not looking for my car to be some all out drag car hopeing to take it out on the track and making it look nice, all out rwkw power doesnt bother me its weather the car feels nice n fun, throws you bak in your seat a bit

[BADR33]

im just using rb30 rods and crank, series 2 vl block. customised rb20e coby extractors. rb30e head gasket. all you really need to do is ballance the internals and you will be sweet to rev to 7500rpm. on my stock ecu it revs hard to just over 7000rpm. i would replace all the bearings and seals in the short block atleast. you might find the crank has a grove warn by the oil pully seal so that would have to get fixed to be sure it dont leak oil.

i think the rb26 head is a better choice if your wanting to do cams and trumpets as the heads are pretty much set up for big cams and they are a better flowing head... as the 6 throttles will bolt straight on with out an adaptor plate you can still deck the block if you go rb26 head.. if you go r33 rb25 head you will need to get the front oil gallirie modifyed and run a hose for the VVT oil feed.

i am happy with mine. mine put out 1040nm of torque on a hub dyno.. or 264NM from the engine. it dus throw you back in the seat. everybody that rides in it is suprise with the torque it has for a NA even the guys from turbo cars are suprised. my car is definaly fun to drive. hence why i just go for random drives just for the sake of it. if you want to see the dyno sheet just scroll thru the old pages and you should be able to find a link of my dyno sheet. i have a few threads on my bulid up of my engine.

i dont have a front strut bar. car still handles fine but thats probly becasue i have coilovers and a huge front sway bar

Edited July 13, 2006 by BADR33

[dondesoto]

BADR33 , have you got a time for your car on the 1/4 mile yet .

[BADR33]

nah not yet sorry. its winter time here. the nearest drag strip is closed.. well the only other one i know of is 8hrs away..

when it gets back to spring/summer i will take it to the strip and see what she dus well whenever i hear of the next drag met

have you dynoed yours yet?

[unarmed_skyline]

how much harder is it to build up an rb26/30 rather than a 25/30 thou?? because i've been told its not as straight and easy with a rb26 and then i have to go throw the hassels of having an obvious different engine than what was in there, because i have a 33 with an rb25de in there already and so i dont have to but a gtr head and i can get away without getting a conversion engineered cause the cops wont easily be able to tell i got a vl bottom end on there, although the trumpets are illeagal.

im not sure the grt head will be worth the extra trouble

[BADR33]

the GTR head actually requires less modification then the rb25 one. its all to do with the head stud being larger. but im not sure weather your make them bigger on the block or where.

im not to sure about the wiring for rb26. if you got a r33 rb26 engine loom you should be sweet as. otherwise just run rb25de items as they should work alright. but really the rb26 head looks the same as a rb25 head.. just with a side pleninum.. how meny cops are going to know the difference?

but otherwise just to make the wiring easyer just go with the rb25de head as wiring is a pain in the ass...

damn trumpets are illigial over there? gutted as for you.

with the rb25de head it will look just like a rb25de.. you will need to bang a couple of the bonnet suports up. but if you get a side pleninum you will be all good.

in the end its up to you. plan out what you think will work best and suits your budget and parts avaliability. as your engine is already rb25de. are you using your engine as donar parts? if so then just use your engine for the parts as you will need all the senders etc off it.

[342Four]

get in contact with member Slide for info on a 26/30 build - although his is a det

(he is actually running a rb30det with a rb26 head and some mad ass gt35/40 turbo - unless he has actually changed it now )

[dondesoto]

nah not yet sorry. its winter time here. the nearest drag strip is closed.. well the only other one i know of is 8hrs away..

when it gets back to spring/summer i will take it to the strip and see what she dus well whenever i hear of the next drag met

have you dynoed yours yet?

sorry for delay . No havent had it dynoed yet , probably wont , car will only be on road a few more months before it goes to Skyline heaven .

[BADR33]

what you mean going to skyline heaven?!

what are you going to do with the engine etc?

what plans do you have after this one?

[unarmed_skyline]

R.I.P. :,(

[dondesoto]

what you mean going to skyline heaven?!

what are you going to do with the engine etc?

what plans do you have after this one?

This is whats happening .

About 6 mths ago i bought a mint 89 gx wagon off ebay for $ 900 .

The plan was to tranfer the drive train from the rusty red car into it .

As i wanted more power out of the rb30de , i did some sums and figured i could get more power by putting in a Nissan V8 . So i have bought a Nissan vh41de half cut for $ 1700 . It was going to cost me at least $ 2000 for a pair of rb25 cams and an aftermarket ecu . Plus i can sell off the rb30de and manual box and all the other goodies for more than the cost of the half cut . Bsaically its going to cost me nothing to go faster , just a lot of time and a few headaches i spose .

End result will be 89 gx wagon with vh41de , hopefully by about October .

Red wagon will go to heaven ( just dont like dead cars hanging around )

[BADR33]

oh true. sad to hear. but understandable. im sure you should easily be able to sell that engine. wuold save alot of people the hastle and cost of building one...

good luck with the vh41. should be good fun i must say