Jump to content
SAU Community

Recommended Posts

RB25 Fuel and compressor surge issues.

HI guys

I just want to say how frustrated I am with my stupid car. I have sent this issue to 4 mechanics in gold coast and no one can seem to fix it.

Basically the car feels like its compressor surging under light acceleration and feels like something is restricting the car power wise. The car wont pull like it should and feels more like a civic. The car also sounds raspier and harsher than it usually does.

The back of my bumper is caked with oil and completely black. Looks like it might be over fueling or something. You would think it would be picked up on the dyno though.

 At times, although rare, it will free itself up and boost like it should but its a rare occurrence when this happens.

when this is happening the car is is using a crap load of fuel. It would easily go through a whole tank of fuel in half a day. This isnt normal.

I think lowering the boost and duty on the EBC seems to help slightly but im not sure. 

I have had the car on the dyno and no one can seem to find the issue.

mods I have done

Power FC

front mount 

full exhaust

spit fire coil pack

aftermarket fuel pump

AVCR boost controller

stock turbo and injectors. 

I have done everything humanly possible to fix it. Boost leak test, replace waste gate actuator. All new piping. I don't know what else to do!

any help would be greatly appreciated.

 

 

Edited by Redknight

None of your mods are really going to make your car get up and go but since you have a PFC it should be tuned by someone who is familiar with RBs.

This one is not very close but does come highly recommended: http://dvstuning.com.au/contact/

Maybe members can find you someone adequate closer to you.

2 minutes ago, KiwiRS4T said:

None of your mods are really going to make your car get up and go but since you have a PFC it should be tuned by someone who is familiar with RBs.

This one is not very close but does come highly recommended: http://dvstuning.com.au/contact/

Maybe members can find you someone adequate closer to you.

 

Thanks for the reply mate. My car was tuned by PITTS at Molendinor. 

it made over 200kw at the wheels so its not too bad. Problem is the surging under acceleration is making the car lose power.

do you think it could be tune issue? I hope not because PITTS is considered the best in Australia according to many people.

2 minutes ago, hy_rpm said:

Turbo intake been replaced?
Known to suck shut under more boost power and heat

Hey mate. No its still using the stock turbo intake. It does feel pretty soft though.

I am running 13 pound boost. Would it suck shut with that amount of boost? And would it be picked up on the dyno?

 

15 minutes ago, hy_rpm said:

Yes depending on the condition and age
Depends on the dyno as the bonnets open and only do afew full power runs for short burst
Where as on the road under bonnet temps are alot higher and running under load alot longer

Thanks a lot for your help. I will replace it with a metal intake and see if it helps.

would the intake sucking shut make the car compressor surge under acceleration? 

One thing to double check is the fuel lines, i'm not sure on the details but i have seen on a previous car when the lines got confused, the vapor line was hooked up to the return and the return on the vapor nipple...  the two nipples were different size internally and the car sucked up raw fuel under vacumn and pumped out a shitload of fuel on load.

Also, try Gavin Woods at Autotech, he knows RB's.

Edited by AngryRB
28 minutes ago, AngryRB said:

One thing to double check is the fuel lines, i'm not sure on the details but i have seen on a previous car when the lines got confused, the vapor line was hooked up to the return and the return on the vapor nipple...  the two nipples were different size internally and the car sucked up raw fuel under vacumn and pumped out a shitload of fuel on load.

Also, try Gavin Woods at Autotech, he knows RB's.

 

Thanks a lot guys. You might be on to something there mate as my vapor lines don't look right. Ill be taking my car to Gavin wood on monday.

 

  • Like 1

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

    • HELP   Hey all, Is there an accelerator cable from another Nissan that can be used on the R33 GTST RB25DET with a Greddy forward facing plenum?  Thanks in advance  Rob 
    • Or do we think it was installed to give 1 bar of boost max, all day, everyday?
    • So could it be assumed it has been installed intentionally with potentially a power FC boost controller kit? 
    • Had my rig on Matt's dyno at PITS the other day. After a few years between tunes I added a few sensors and swapped intercoolers. Result. 553hp at 26psi. Not bad for an FJ20 that was built in 2007. The problem.. It filled the overflow bottle on hard runs which leads me to believe the head gasket isn't sealing. I have a coolant pressure sensor which was reading cap pressure at 22psi and occasionally overrunning to 23/24 psi on deceleration after a pull. It was not spiking. It has arp2000 head studs and a cometic gasket. As its been 18 years in service, I pulled the engine out and head off. Everything looks good but we obviously have an issue. Where I'm at.. Years ago I had the same issue, I checked the stud tension and they were all over the place. Some at 60 to 70 and some up near 90. I nipped them all to 100ft lbs and this stopped the water push until now. I believe this compromised the gasket back then. What do I do? 2 options are..  1) I bought arp 625+s, which I could put in with a new gasket. Thinking Kameari this time, reassemble and try again. 2) strip the block, get fire rings machined in with copper gasket and try that. I do not want to push it more than 28 to 30psi. I think the turbo will be out by then anyway. (G30-770). My other concern is the long term ability of a copper head gasket. Are they streetable for years? I feel like a new gasket with the new studs will probably suffice, but I don't know. Any thoughts welcome and advice on copper gaskets and fire rings. Thanks!
    • I'm a fan of the JZX110, and the Aristo. Big cruiser cars, and with the factory cars, super comfortable and feel like you're driving an armchair! And the JZ motors are a pretty nice engine too, especially with some basic mods.   The import process, and the need to be able to trust people, and the fact there's so many scammers around is what ever puts me off wanting to go through that ordeal!
×
×
  • Create New...