Need Help With Rb25det Twinturbo Build

[stricnynel0s]

please for the love of god.. dont have it running untill you replace those stock r32 turbos.. they will let go on you easily

haha i just wanna break engine with them, i am not gunna try to squeeze milk from a rock !! for the water return lines could i use something like this

http://www.gtfactory.jp/cms/e107_plugins/z...t=22&cat=11

Edited April 5, 2008 by stricnynel0s

[gtst25]

Big power TT rb25 I had years ago. Photos are recent taken from the current owner, ignor the dust/dirt. New owner ditched AFM and went Djeto Power FC.

Oil and water lines were custom. Low mounted as it was more "stealth". Manifolds were factory cast GTR items that has the flange's cut off and re welded to suit the rb25 stud pattern.

Oversized forged pistons

Fully balanced

O ringed block

Major head work - Huge ports, a/m valves and springs ect ect

275 HKS cams

Custom cam gears

Greddy plenum

Q45 throttle body

100mm+ thick FMIC

GreddyBOV

Power FC

HKS 2530 turbos - Had them rebuilt using larger HKS 2535 wheels

HKS dumps

3inch front pipes

HKS 4inch super dragger exhaust

1000cc Sard injectors

300zx AFM (Might have been Q45, can't remeber)

Apexi pod filter

3/8 fuel lines

Malpassi fuel regulator

Wow,

Very nice engine bay - I take it the new owner's had it sitting in his dirty garage for years?

You didn't post up a power figure, or even better a dyno chart?? Would love to know what it made!

Cheers

[STR8E180]

^ nice setup

i just dont like the idea of welding onto cast iron

[Nismo_Boy]

Wow,

Very nice engine bay - I take it the new owner's had it sitting in his dirty garage for years?

You didn't post up a power figure, or even better a dyno chart?? Would love to know what it made!

Cheers

Yeh, the current owner works in the mines or something and is never home, he is on the forums, no doubt he’ll come across this thread soon enough and be able to fill you in on all the little changes.

My under standing is, it hasn’t been driven in over 2 years, or close too and has just been sitting in the shed.

I don’t have dyno sheet, or wouldn’t know where to put my hands on one, sold that car way back in 03` or 04`.

There might be one in the zoom mag write up. I think it was number 33.

The hp figures however where 600rwhp on c16 with 1.8bar IIRC and 10.8 @ 128mph at Willowbank

[jeffworld2]

how i plumbed the water returns from the turbos:

[jeffworld2]

also i had the same idea with the r32 turbos, now have 4 dead ones sitting in the shed.. they just didnt like being removed and put on a different car. i assume they need to be kept full of oil while off which i certainly didnt do. after fitting turbos, rebuilt the motor after bottom end noise, then the built motor was fine but turbos were shite...

so now i have fitted the turbos i initially wanted to after around 2k km's on noisy non-boosting half-blown r33 turbos. soooo much shaft play

but yeah lots of turbos in the shed looks cool? lol

[stricnynel0s]

also i had the same idea with the r32 turbos, now have 4 dead ones sitting in the shed.. they just didnt like being removed and put on a different car. i assume they need to be kept full of oil while off which i certainly didnt do. after fitting turbos, rebuilt the motor after bottom end noise, then the built motor was fine but turbos were shite...

so now i have fitted the turbos i initially wanted to after around 2k km's on noisy non-boosting half-blown r33 turbos. soooo much shaft play

but yeah lots of turbos in the shed looks cool? lol

is that the heater core hose ? and which one the top one or the bottom one ? since my car is lhd its all the way on the other side lol ohh well i will do it, its just a barb fitting from the turbo to an6 line at thet cross bracket ?

[jeffworld2]

you might be better off doing same thing in the ottom radiator hose then, that might still be in the right spot? lol

[stricnynel0s]

you might be better off doing same thing in the ottom radiator hose then, that might still be in the right spot? lol

thats worse lol !! i was thinking of returning the water to here http://www.gtfactory.jp/cms/e107_plugins/z...t=22&cat=11 ir maybe even the heatercore

if i use that air water seperator, i could do the two lines to the two intake nipples on it and the return nipple to the water nipple at the water neck on intake side

[DaGr81]

would it be more cost effective adapting the rb26 head to the rb25 block? how about the intercooler did you have to ditch your old one or did you customise the old one?

for example if i had twin turbos on an rb25 (lets say both can make 500hp combined power) stock displacement and all and if you put that side by side with an rb25 sporting a 2.8L kit and a 500hp turbo (single) which would be more responsive??????????

[PM-R33]

for example if i had twin turbos on an rb25 (lets say both can make 500hp combined power) stock displacement and all and if you put that side by side with an rb25 sporting a 2.8L kit and a 500hp turbo (single) which would be more responsive??????????

Assuming compression ratio is the same id put my money on the 2.8 with a single.

[mambastu]

I would have thought the RB26 would be more resposive; larger displacement, better flowing head with larger cams, 6 throttle intake etc. Only down side i can see is the RB26 having a lower compression ratio. However surely a RB25 would still be slightly laggier with twins? Any one that has experienced both cars know?

I have a 420ish bhp RB25DETT in a RS13 which I built a few years ago. Very linear power delivery. Used R32 GTR standard turbos. Spools about 250rpm faster than my R32GTR and produces better power.

The only thing I prefer over the RB25 is the RB26's throttle response which is better but the 25 spooled earlier and generally felt more zippy which I attributed to the the NVCS and higher compression.

Change the pistons though, my number 1 piston broke up after two years/30,000 miles of being hammered.

[R31Nismoid]

re: larger displacement.... RB26 factory isnt a true 2.6l, its 2555 or something and the RB25 is around 2495, rough figures so they arent gospel but you get the idea... not much in it

[Mr Jollwah]

I was thinking that the water return for the turbos could be routed around the front of the engine

to a fitting in the thermostat housing.

Has anyone tried this?

On second thought why wouldn't you just tee them together and use the exhisting return for the factory return.

[whietdragon]

hey guys does anyone know where i can by earls performance hose fittings, in melbourne australia (south-east)? or any online stores that sells to Aus, also accepting non-us paypal accounts