Jump to content
SAU Community

Recommended Posts

Hey all.. ive done some searching but couldn't find anthing...

I have a rb25 series 2

Nistune

exhaust and cooler

new coils and plugs

the car "stumbles" at 3500rpm...and the boosts fine to 10psi in all gears.... its gets worse once its warm... im unable to boost it without it popping and farten.

any ideas guys???

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/
Share on other sites

It had splitfires in her. Then changed to some ebay ones..they are red.

brand new z32 afm has been installed

ive put in 3 new sets of plugs... 7es ones (colder type plug)

Also had the cooler piping fixed up last week as well. . It was fouling the swaybars etc

Also cleaned the iac valve

checked the injectors and had new orings installed

any advice would be great.... this car is doing my head in

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7331100
Share on other sites

So car hammers when cold? And you hammer it when cold? That's dumb.

Why write any advice would be great after receiving heaps of advice?

Should we take that as you are rejecting advice given up untill that point?

And to clarify. I suggested the three things as they are all likely causes causes of your car running like it does. You are welcome to ignore them but I would suggest pressure testing your inlet.

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7331129
Share on other sites

Ben, I actually thought the same as you....but I then realised that just maybe, giving a little credit to the OP, that mentioning that it goes hard when cold but has a bigger problem when hot is at least a valid piece of information.

I mean, if it were me being the OP I would have felt the need to tell people that I don't normally punt it when cold, just to make sure they realise I'm not an idiot but only did it for diagnostic purposes, but obviously some people don't feel the need to allay suspicion in such circumstances.

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7331226
Share on other sites

Im not trying to start an argument. .. but picking up on " it hammers when cold" and telling me im dumb.. to me is a key peice of information to help diagnosis

as for writing "any advice with a reason for your advice" .. anyone can rattle of parts of a car afm, gearbox, plugs... but why do you think its that part will help me alot more

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7331306
Share on other sites

Im not trying to start an argument. .. but picking up on " it hammers when cold" and telling me im dumb.. to me is a key peice of information to help diagnosis

as for writing "any advice with a reason for your advice" .. anyone can rattle of parts of a car afm, gearbox, plugs... but why do you think its that part will help me alot more

I didn't say you are dumb.

I said hammering a cold engine is dumb.

I think it's a boost leak or dirty afm because they make the car have the symptoms you are suggesting

I also couldn't be stuffed writing along response explaining my reasons initially.

Just like you didn't bother to write a post that explains your problem and the car history fully.

Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7331332
Share on other sites

It had splitfires in her. Then changed to some ebay ones..they are red.

brand new z32 afm has been installed

ive put in 3 new sets of plugs... 7es ones (colder type plug)

Also had the cooler piping fixed up last week as well. . It was fouling the swaybars etc

Also cleaned the iac valve

checked the injectors and had new orings installed

any advice would be great.... this car is doing my head in

Might want to check the compression and timing, then put the splitfires back in and check for leaks with carby cleaner. Injector O-rings lubed?

We are assuming the setup was tuned before not just someone elses nistune from ebay with an Ebay special turbo bolted on ?

Edited by AngryRB
Link to comment
https://www.sau.com.au/forums/topic/445271-bloody-rb25/#findComment-7332335
Share on other sites

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

    • I guess one thing that might be wrong is the manifold pressure.  It is a constant -5.9 and never moves even under 100% throttle and load.  I would expect it to atleast go to 0 correct?  It's doing this with the OEM MAP as well as the ECU vacuum sensor. When trying to tune the base map under load the crosshairs only climb vertically with RPM, but always in the -5.9 column.
    • AHHHH gotchaa, I'll do that once I am home again. I tried doing the harness with the multimeter but it seems the car needed a jump, there was no power when it was in the "ON" position. Not sure if I should use car battery jump starter or if its because the stuff that has been disconnect the car just does send power.
    • As far as I can tell I have everything properly set in the Haltech software for engine size, injector data, all sensors seem to be reporting proper numbers.  If I change any injector details it doesnt run right.    Changing the base map is having the biggest change in response, im not sure how people are saying it doesnt really matter.  I'm guessing under normal conditions the ECU is able to self adjust and keep everything smooth.   Right now my best performance is happening by lowering the base map just enough to where the ECU us doing short term cut of about 45% to reach the target Lambda of 14.7.  That way when I start putting load on it still has high enough fuel map to not be so lean.  After 2500 rpm I raised the base map to what would be really rich at no load, but still helps with the lean spots on load.  I figure I don't have much reason to be above 2500rpm with no load.  When watching other videos it seems their target is reached much faster than mine.  Mine takes forever to adjust and reach the target. My next few days will be spent making sure timing is good, it was running fine before doing the ECU and DBW swap, but want to verify.  I'll also probably swap in the new injectors I bought as well as a walbro 255 pump.  
    • It would be different if the sealant hadn't started to peel up with gaps in the glue about ~6cm and bigger in some areas. I would much prefer not having to do the work take them off the car . However, the filler the owner put in the roof rack mount cavities has shrunk and begun to crack on the rail delete panels. I cant trust that to hold off moisture ingress especially where I live. Not only that but I have faded paint on as well as on either side of these panels, so they would need to come off to give the roofline a proper respray. My goal is to get in there and put a healthy amount of epoxy instead of panel filler/bog and potentially skin with carbon fiber. I have 2 spare rolls from an old motorcycle fairing project from a few years back and I think it'd be a nice touch on a black stag.  I've seen some threads where people replace their roof rack delete with a welded in sheet metal part. But has anyone re-worked the roof rails themselves? It seems like there is a lot of volume there to add in some threads and maybe a keyway for a quick(er) release roof rack system. Not afraid to mill something out if I have to. It would be cool to have a cross bar only setup. That way I can keep the sleek roofline that would accept a couple bolts to gain back that extra utility  3D print some snazzy covers to hide the threaded section to be thorough and keep things covered when not using the rack. 
    • Probably not. A workshop grade scantool is my go to for proper Consult interrogation. Any workshop grade tool should do it. Just go to a workshop.
×
×
  • Create New...