Jump to content
SAU Community

My car is nearly leaning out. If I want more boost I need to...

someonestolecc

By someonestolecc,
in Engines & Forced Induction

 Share

Recommended Posts

someonestolecc Grand Master

someonestolecc

Posted
  • Author
Posted

Thanks SydneyKid - any recommendations?

Thanks Dr - hehe I don't know if that would be offset by the petrol and time spent getting to and from (i work a pleb 9-5 mon fri work so not quite feasible). Thanks anyway though.

I was actually wondering how to put the same tune from the current ECU and put it on a PFC as a base to start tuning it in Sydney. Is that possible? (i'm talkin many many months down the track here).

Dr_Drift Veteran

Dr_Drift

Posted
Posted

someonestolecc - I love tuning that car... I'm sure i can make it feasable... we're open weekends also.... As for converting to pfc, no chance, completely different storage methods...

someonestolecc Grand Master

someonestolecc

Posted
  • Author
Posted

Lol.

I assume the aim was to blow it up? ...orr.....?

I'm thinking of getting some larger injectors also after reading up some setups that also run this turbo at the power levels I'd like to have - but mostly for safetys sake.

My theory is if a 550cc has a clog, it flows less then say a 760 with a clog..

My further question is with larger injectors that aren't flowing more? (ie they're just larger but not pumping more fuel in on that map) will it affect fuel economy? and is my theory that larger injectors would have an easier time with flowing fuel whilst being clogged?

I'm 50/50 thinking this at the moment cos on the other hand I guess the injector is just capable of flowing more - if it's not flowing more then if it gets clogged flowing 400cc (say) equivalent of fuel then it don't matter how big it is it's still blocking 400cc worth of flow.... if that makes sense.

someonestolecc Grand Master

someonestolecc

Posted
  • Author
Posted

Well.. I'll re-phrase simply with (a theoretical) assertion as the 'spark'/stimulus.

"550cc injectors clogged with 1 unit worth of gunk perform worse than 760cc injectors clogged with the same 1 unit worth of gunk."

"Therefore based on that assumption bigger injectors are more reliable even though the 550's are not maxed at the power the car is making."

--OR--

'If the injectors are flowing say 300cc at any given moment - whether they are rated at 550 or 760 they are both going to have the same trouble if the same 1 unit of gunk clogs them."

Cubes Grand Master

Cubes

Posted
Posted

The point is if a car is tuned with a 12:1 AFM and an injector becomes clogged then that injector is going supply less fuel in turn leaning out. It doesn't matter if the injector is a 1000cc, if its tune at 400hp then it will still lean out. UNLESS you were running a wideband O2 sensor with some fandangled ECU that kept the fuel afr perfect.

someonestolecc Grand Master

someonestolecc

Posted
  • Author
Posted

That answers my question to a tea - thank you.

Which basically means since the 550's are not maxed out I won't be upgrading the injectors. I will however be making sure they are not blocked!

Thanks again.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      NC MX5

      By GTSBoy · Posted

      Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • GTSBoy
      R33 GTR running -9 with no tune

      By GTSBoy · Posted

      So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around with a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • joshuaho96
      Squeaking clutch/throw out bearing

      By joshuaho96 · Posted

      Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
    • jayden_l33
      Squeaking clutch/throw out bearing

      By jayden_l33 · Posted

      It ended up being that orientation of the float hub in relation to the clutch disk, when I installed it, I heard a loud click and being stupid, I decided to not take it a part and check it. The hub didn't properly align with the clutch disk and was causing the issue. Definitely an odd one! Dahtone Racing was able to fix me right up, stand up blokes!      
    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      Right, but I'm saying on the stock ECU measured airmass from the MAF is no higher than stock. So it's accounting for the higher flow rate iso-manifold pressure. You just have to keep turning down the boost until you're within the stock tune's load scale. If you run off the end there's no telling what will happen. This does mean there's zero benefit to the turbos you're running vs stock, if anything it's just a straight downgrade because the transient response is worse, you don't even get the ECU's boost solenoid helping to pull the wastegate closed during initial spool, and peak power is only whatever the factory map can give you before you hit the R&R corner. On a -9 I would bet that you would have to change out the wastegate spring once you have a real ECU and you're tuning it for real. I'm not saying this is a remotely ideal state of affairs, it's just a way to keep it driveable until you can get a proper tune done.
×
×
  • Create New...