Jump to content
SAU Community

tuning and boost pressure.

FATGTS-R

By FATGTS-R,
in Engines & Forced Induction

 Share

Recommended Posts

FATGTS-R Experienced

FATGTS-R

Posted
Posted

ok

Just completed getting a major service, new brakes, fitting a bov and getting a full 3 inch exhaust system.

I am now ready to have my ecu chipped and have the car tuned properley.

My current way of boost control is a greddy under bonnet dial. ( still debating on changing to electronic control, but thats another thread ).

My question is this:

Lets say the car is tuned with the boost pressure at say 1.3 BAR and is running perfectly. If I decide to turn the boost pressure down to say 1.0 or 0.8 BAR will it still be in " tune "? As in will timing and a/f ratios still be spot on? Could it still detonate? I understand turning it up might not be recomended as detonation would be more likely but if the ceiling pressure is 1.3 BAR is anything lower going to still be spot on or will it only be at its most optimum efficiency at the pressure its tuned at?

Link to comment
https://www.sau.com.au/forums/topic/34082-tuning-and-boost-pressure/
Share on other sites
Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi Guys, the Power FC mapping has a boost correction table, so you can tune it for any number of boost levels. When you think about it, that has to be the case, otherwise you would have to drive around at the one boost level all the time. We all know that doesn't happen.

Other tunable ECU's are exactly the same, even a chipped standard ECU would have a boost correction table.

Hope that answered FATGTSR's question.

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi Emre, yes the AFM is relevant but you can have different airflows at the same boost. For example 4,000 rpm at 1.5 bar might be the same airflow as 6,000 rpm at 1 bar. So the ECU uses both, plus of course throttle position, rpm, lambda, engine temp, etc etc. The ECU processes them all and uses the appropriate map.

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

    • sinn3r
      R34 Skyline climate control unit transistor

      By sinn3r · Posted

      Hi all,   long time listener, first time caller   i was wondering if anyone can help me identify a transistor on the climate control unit board that decided to fry itself   I've circled it in the attached photo   any help would be appreciated
    • Kinkstaah
      Blue slip

      By Kinkstaah · Posted

      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!
    • GTSBoy
      Best place to order Authetic R32 Parts in Japan

      By GTSBoy · Posted

      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.
    • GTSBoy
      Ethanol Content Sensor - Always at 11%?

      By GTSBoy · Posted

      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.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      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.
×
×
  • Create New...