Jump to content
SAU Community

Recommended Posts

Hey guys, as some of you may know, not long ago I needed some help about driving my car untuned with a new turbo, injectors, afm and fuel pump, before I was going to get a tune.

I put in the turbo so far, getting a fuel pump this week and then put the rest in over the weekend or so....

but something a little strange seems to be happening to my car at the moment, with just the new turbo in...

The car is running brilliantly at the moment... even though its untuned I can tell there is alot more power... the only concern I have is that after I hit boost ( which comes on really fast and really quick - (2,600 - 3,000 ) and let off the accelerator and go into neutral... ie rolling to the red lights... the revs drop as normal...... but they go too low... they may drop bellow 400rpm or 100rpm and the car may even stall on itself... this only happens in neutral when revs are free... not when I am rolling to the lights in a gear after hitting boost and the revs are a much slower controlled drop.

These are my assumptions: (tell me if you have any other ideas what it could be)

1. Crappy tune- especially not for this turbo and the rest of the stuff I am going to put on (but we already knew this)

2. Standard Blow off valve not doing its job correctly any more because of bigger turbo (only running about 11psi though) and some of the air it lets back into the turbo and the other goes back the other way making the cho cho cho sound and goes out through the pod making the afm read negative numbers so it drops the rpm and retards timing,etc... so it almost stalls...

3. Timing belt/actuator i don't know??!? timing belt was changed about 40,000 kms ago....

so to help this I have heard I should relocate the afm meter to around the throttle body area and/or get a new BOV but I want something legal.... so maybe like a GTR one.... but I still don't know...

Thanks for the help in advance.

Adam.

Firstly why the hell are you boosting the car with A)A bigger turbo B)Standard fuel pump and injectors? :banana:

Your AFM will be the blame for the fluctuating revs due to the increased airflow,and going a bit crazy as its not tuned for it.

Gives a totally new meaning to fixing something that aint broke... She is broke because its untuned.

Get it tuned. Fix the problems after its tuned, if there are any!

lol... that was the first question I knew I was going to get .... just wanted to wait and see who was going to say it ! but to answer your question... it is very hard not to.... considering how quick the boost comes on... and how low it does.... I also forgot to mention I have a powerfc... but with a crappy tune.. I am not running on a stock ecu.... and thank you for confirming what I thought about the afm...but is it anything to do with the bov because it is making the woosh sound as well as the cho cho cho( so I thought some air is going around and some is coming back out the pod)

so if it is the afm... when I chuck in the z32 that I have... do I relocate it or will it do better once tuned in the same spot? I would like to keep it where it currently is...

Adam

You wont know it was running lean untill you blow it up. pull it appart and think... "maybe i should have waited to tune it before boosting it"

If your that short scrapped for cash PM me maybe i can do you a credit tune

Its simple dude,dont boost the car at all until you get the other mods done.Especially the tune.

But you will only be getting it tuned when you get all the other mods done.Reason being is the car wont run with bigger injectors,plus you will need to change the AFM settings on the PFC once the Z32 is wired in.

oh ok thanks for the info... and you can all rest assured and save lectures because I am not pushing the car... nothing over 3,000 rpm changes... driving like a pussy cat....

interesting guilt toy.. wot is a credit tune?

thanks

oh ok thanks for the info... and you can all rest assured and save lectures because I am not pushing the car... nothing over 3,000 rpm changes... driving like a pussy cat....

interesting guilt toy.. wot is a credit tune?

thanks

credit tune=tune now, pay later...

If you can hear flutter (cho cho cho sound) the air is bouncing out of the turbo back towards the AFM, AFM tells the ECU to add more fuel, ECU adds more fuel, not enough air, car stalls.

As stated above a tune *should* fix it. But i have no experience with hypergear turbos they may suffer compressor suge, either way see how you go.

ok, thats interesting... I don't know about the compression surge your talking about but yeh, I was hoping a tune would help the afm issue... I believe I am getting boost spikes as well..but I havent put my foot down enough to know for sure, but is that a symptom of the surge as well?

thanks,

Adam

Thanks Tao :D I have been really happy with it so far... just need to get a few little bits sorted...and the tune. oh and btw, I got my brakes sorted... used a brand of pads called qfc...I dunno much about them.. but they fixed the squeal! :thumbsup:

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 mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
    • Yes they do. For some maybe. But for those used the most by abusers, ie Skylines, the numbers are known. The stock eyebrow height for R32/3 Skylines is about 365/375mm or thereabouts. The minimum such heights are recorded in adjacent columns in the database.
×
×
  • Create New...