Need Quick Rb25 Info Someone Please Help

[RBJ37]

hey all just need some quick rb25 info as im new to them and dont know much about

them have always had rb30et's ok so first i have just bought a vl with a 1996 r33 s2 rb25

conversion done in it mods are 3 inch exhaust and cooler using standard r33 ecu

ok well it was only running standard boost 7psi but i just bought a boost tee and put

it up to 11-12psi now i know they only have a ceramic rear wheel so how much boost am

i safe to run ?? and how much power have ppl gotten out of just few simple mods like mine

and whats acheivable with standard turbo dont wanna upgrade just yet but yer just really

wanna know the boost one before i go driving it to much on 12psi any info is muchly appreciated

thank you all RBJ37

[Jay_stylz]

prob wouldnt go over 12 psi

[RBJ37]

prob wouldnt go over 12 psi

is that a definate cause i have read so much shit that ses its ok to only run 9psi other ppl

say 10 11 and 12 so what can they actually handle ??

[StealthX]

IIRC the series 2 turbos can handle a bit more boost.

Dunno where, but I definitely saw that somewhere.

Still wouldn't go past 12 pound...

With all that, you should be looking at about 180-220rwkw depending on the tune.

If i were you, id be getting a tune, so you can really enjoy the benefits of the increased boost.

[EDIT] my mate has a RB25 (series 2) in his patrol, and runs 12psi daily, no issues. He was at 15psi for a while, and that poor little turbo is still going fine...

Edited October 8, 2009 by turbo x-trail

[RBJ37]

IIRC the series 2 turbos can handle a bit more boost.

Dunno where, but I definitely saw that somewhere.

Still wouldn't go past 12 pound...

With all that, you should be looking at about 180-220rwkw depending on the tune.

If i were you, id be getting a tune, so you can really enjoy the benefits of the increased boost.

[EDIT] my mate has a RB25 (series 2) in his patrol, and runs 12psi daily, no issues. He was at 15psi for a while, and that poor little turbo is still going fine...

thanks heaps for the info but how can you get a tune with a standard ecu ?? what just timing and what not

im not to sure with these 25's and there comps i only know rb30et's as thats all i have ever used i know you cant

do much with a standard vl turbo ecu are 25 comps much different ?? i got nothing to tune only standard ecu ??

[Ultimategtr]

My advice is leave the timing alone(15).

Save up and get a power FC or get a nistune. Might want to turn the boost down to 9-10 if youre going to be taking her to the track.

[RBJ37]

My advice is leave the timing alone(15).

Save up and get a power FC or get a nistune. Might want to turn the boost down to 9-10 if youre going to be taking her to the track.

i was actually just thinking about goin to see my good mate rick at efi performance and was thinking

bout goin with a nistune and maybe using a z32 airflow meter as i have heard they are the best to use

and will support upto about 500hp ?? and for about 950 fitted and tuned the nistune is best bang for the

buck i reckon what is everyones thoughts on even just using maybe and safc and maybe e boost2 or

something was thinking maybe just goin that way as i would be happy with 200rwkw for the mean time

till i upgrade to 35/40 and all the rest of the goodies and would 11 psi be ok for the street with standard

turbs thats what it is on atm cant hear any pinging or anything of the sort so think should be ok maybe till

i get a power run and afr to make sure everything is ok.........

[JonnoHR31]

12psi is fine. aslong as base timing is set properly and everythings working as it should then it wont knock on the standard ecu, way too much fuel and not enough timing. for nistune on a 25 you need to use a r32 or z32 ecu, z32 allows you to keep vct but requires a few wires to be changed around.

[geraus]

Running 12 psi on your stock turbo is fine wouldnt go over though. With your current mods... i know with a PFC stock turbo you'l be achievable of doing 180-200kws. With stock ECU maybe 160-170's range.

[DaveO74]

I was running 15psi through my standard turbo and eventually it did let go, lasted about a year but mine is not a daily. Just my 2cents

[RBJ37]

12psi is fine. aslong as base timing is set properly and everythings working as it should then it wont knock on the standard ecu, way too much fuel and not enough timing. for nistune on a 25 you need to use a r32 or z32 ecu, z32 allows you to keep vct but requires a few wires to be changed around.

well i have set on just 11psi so wont push it anymore then that might go for a highflow very soon as my mate

works for mtq here in brisbane and builds turbos all day haha get myself a brand new highflow for about $400

pretty sure base timing should be ok seems to run fine just not as fast as i would thought it to be i think there

might be another little problem as if you put your foot flat to the floor it doesnt really wanna go anywhere but if

you just ease it on slowly it starts moving really need to get a tune and check timing anyway how do i do that

on a rb25 as they are a lil diff to rb30's ??

[RBJ37]

and does anyone have a z32 comp they wanna sell me so i can do a nistune comp

if anyone has one let me know price and shizz i can get one for 250 but just seeing

what else i can get cheaper thanks ppls

[Simon-S14]

you dont need a Z32 afm for 200 rwkw and stock turbo, just nistune the board with stock afm and it will be sweet

[RBJ37]

you dont need a Z32 afm for 200 rwkw and stock turbo, just nistune the board with stock afm and it will be sweet

yer i know that i sed has anyone got a z32 ecu for sale and i have been told no point doing the

z32 airflow meter till i do injectors so all is good just need ecu and i will use the standard 3 pin afm

till i upgrade turbo and injectors

[Simon-S14]

oh sorry i read wrong.

Personally i would just remap a 32 ecu, disregard the lack of VCT as once the ecu is tuned the loss of VCT is not at all noticable

[RBJ37]

oh sorry i read wrong.

Personally i would just remap a 32 ecu, disregard the lack of VCT as once the ecu is tuned the loss of VCT is not at all noticable

i have heard that you can notice it a lil bit in the midrange ??

[Simon-S14]

depends on the tuner.

When mine was tuned, it made more power everywhere in the rev range, so a loss of midrange was not noticed or even evident at all when compared to the stock map.

that said ive driven some set ups with utterly shit tunes on them and they feel like a dog to drive down low but go hard up top. thats because theres plenty of tuners out there who are shit at anything but focusing on WOT maps.

[RBJ37]

depends on the tuner.

When mine was tuned, it made more power everywhere in the rev range, so a loss of midrange was not noticed or even evident at all when compared to the stock map.

that said ive driven some set ups with utterly shit tunes on them and they feel like a dog to drive down low but go hard up top. thats because theres plenty of tuners out there who are shit at anything but focusing on WOT maps.

hmm interesting well thats really good to know that its only in the tune quite funny how the vct doesnt have

any affect really if the tune is altered haha hmm anyways i will see how i go wen the time comes to put the nistune

in wich will probably be in the next 3 to 4 weeks

[D_Stirls]

Here's a graph of s standard ECU'd R33 SII; just running full 3 inch exhaust and FMIC. Not mine a mates car but as you can see it wasn't done in shootout mode.

Edited October 9, 2009 by D_Stirls

[JonnoHR31]

and a graph of what happens when you run too much boost with a standard ecu, on a s1 anyway. vtec yo

http://i224.photobucket.com/albums/dd251/J...17052008009.jpg

as for not going anywhere, is it blowing out spark?