Jump to content
SAU Community

Recommended Posts

hey dudes

i have rb20det

full inch exhast

600x300x76 intercooler + piping

pod filter

gtr fuel pump

ecu (mines chip)

and just installed new rebuilt rb25det turbo (by steve murch, new bearings still the same wheels)

now before i installed the rb25det the original rb20det turbo was boosting 12psi (about 0.9 bar)

i ran the car for the first time tonight with the rb25det turbo on and the cars power feels the same but its only boosting 0.55 bar???

Should i be buying a boost tap and cranking this to 1 bar (14.7psi)?? and getting what this turbo can really achieve?

have i done something wrong?

if i need a boost tap wat would be the cheapest recommendation???

any help would be great thx

If you didn't swap the wastgate actuators over, that could be it.

and your settings were different bi 0.35bar which is right on 5psi

R32 standard actuator is set to 10psi.

R33 standard actuator is set to 5psi (....i think with the R33 boost solenoid tweaking it to 7psi over 4500)

If that the case (which it looks like it is), spend 20mins swaping the old actuator back in :domokun:

spot on the money birnie.

Since he won't have the 2 stage solenoid, with just an r33 actuator, it runs about 4.5 psi. since he's got a few mods like ic, exhaust etc, it'll run a bit more - that's the 5.5 psi.

pop the 32 actuator in and i won't be suprised with your extra mods if you get 11-12 psi. she'll rip really hard.

spot on the money birnie.

Since he won't have the 2 stage solenoid, with just an r33 actuator, it runs about 4.5 psi. since he's got a few mods like ic, exhaust etc, it'll run a bit more - that's the 5.5 psi.

pop the 32 actuator in and i won't be suprised with your extra mods if you get 11-12 psi. she'll rip really hard.

is it pretty hard to do???

i know how to take pipes off the car and unbolt stuff but do i need to set anything?

cheers

2 bolts to undo on the actuator side, and a 'C' clip on the end where it attatches to the gate.

Put on the R32 one in reverse order and that's it. It should be a straight swap out.

No settings unless you have a boost controller or something to play with

hey dudes

i changed the unit over

and i reset the ecu

boost is now around 10 - 12 psi

but im now loosing power and the engine is slightly popping at 4500 - 5500 rpm

do i need to replace the injectors or fuel regulator or a retune or something?

cheers

FYI,

The spring in the rb25det acuator is 7psi rated. Which is 0.55bar i think?

The 5psi is controlled by the ecu then after 4500rpm it grounds the black wire coming from the elec boost tap deivce and runs 7psi from the actuator.

I ran a rb20 actuator on an r33 turbo and it would run 5psi then after 4500rpm 10-11psi...I cut the black wire going to the ecu and then it never ran 5psi anymore..

Cheers

fyi mzturbo, it is not set at 7 psi. well, not on the stock turbo anyways. With just my stock turbo, I connectected the stock solenoid system up. Because I had exhaust and cooler, I was getting 9psi.

with just the actuator, I was getting 5 psi.

The solenoid is a bleeder. The actuator is 5 psi, it bleeds a little air above 4500 rpm, so it gets a few more psi. not the other way round.

Edited by MANWHORE
boost is now around 10 - 12 psi

but im now loosing power and the engine is slightly popping at 4500 - 5500 rpm

do i need to replace the injectors or fuel regulator or a retune or something?

cheers

the joys of a misfiring skyline

there a billions of threads on misfire

increased boost = harder for spark to jump on plugs = misfiring

solutions? bringing down gaps on plugs = cheapsolution, you still have a weak ignition system

spitfire coil packs = $560 from sliding, it'll fix it

or you could do your own wiring up of igniter's and leads for $100-300, lots more work, theres a few threads about it here and on other sites

intercool is right,

my car done the same thing when is was in R&R mode as it did when it was misfiring.

I had 1.1mm plugs regapped them to 0.6 and the misfiring went completely..

the R&R a tune sorted that out..

ngk bcpr6es which are a .8 gap. It should help with the mis fire unless your coils are absolutely rooted. If it doesn't then either new coils or one of the many fixes that are posted in the maintainence sticky thread.

Dont worry about injectors and regs for now. fix the miss first.

Dude its just a standard RB25 turbo. You really shouldnt need to do much. Just keep gapping the plugs down until it stops miss firing, assuming that sovles the problem. If it does it still means your ignition isnt up to sratch (which is expected as the car is a good 15+yo). You could maybe just put the fuel reg on to be a little safter.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Well, I can recommend the partial AV system translation CD I ordered from Car Audio Workshop in NZ. Whilst it didn't address the date issue, it has conveniently translated on-screen menu items into English, and now allows the GPS-received time to be offset in hours rather than minutes, so I can display Eastern Australian time accurately ( and bump it by another hour when daylight savings starts ).
    • Yuh, if it's 45°C outside, my car is driving in it.
    • I'd be curious to hear more. Otherwise, have you driven a modern x-trail? I wonder how it compares. Here in Australia they are/were popular for rentals and fleet vehicles. I have been in some and my impression was they are bad. But, this may have been very different in the 2000s at a good trim level. Twenty years is plenty of time to make the model worse. I do very much agree with the 2 silver cars in the garage approach. But, not driving because it's too hot would not leave a lot of time in the year for many Australians. I don't think you need to worry too much unless the car has actual issues with overheating. 
    • Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Thanks for that, hadn’t used my brain enough to think about that. 
×
×
  • Create New...