Jump to content
SAU Community

Recommended Posts

Well ok so my R33 has been funny, allong with some other issues, like cold start.

No idea what is going on. The car has been tuned and so forht, and runs great normally. However, i have some funny surge with the car. At 2500 rpm, in second if i floor it, boost comes up to 14 psi, as preset, and the car kinda surges, well it accelerates, then stops a bit, goes to 3500 and takes off agian and stops a bit, and then form 4500rpm it's fine, no issies at all.

What can this be, It only doe sit on higher boost settings.

BTW the turbo is stock, and i don't normally run it at 14 psi. Car mods as per my sig.

Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/
Share on other sites

Showing my ignorance, but what is a Central 20 ECU?

Sounds a bit like electronic intervention to me.

2 much fuel or missfire? r33's normally run rich on higher boost... i had the same problem with my car so i turned it down and left it what it was tuned at lol

Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/#findComment-2956043
Share on other sites

How about failsafe?

Maybe they've retained/modified some of the protection parameters. The AFM reports flow voltages in excess of what is deemed "safe" by the tuners, pushing into map cells that they say it shouldn't do if operating at a certain boost level.

Then it just goes through a series of rich/retard steps to discourage the driver. Guys running stock ECU report the same phenomenon but generally at lower boost.

Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/#findComment-2956117
Share on other sites

Compressor surge has nothing to do with an electronic tune.

It is about the physical inability of the engine to ingest the mass of air that the compressor is delivering. It is generally associated with big compressors and small capacity engines running a bit of boost. Garrett offers a really informative tutorial here http://www.turbobygarrett.com/turbobygarre...bo_tech103.html to explain the phenomenon.

Original post indicated a stock turbo, running higher than stock boost. Very very unlikely to be surge @ 14psi.

Edited by Dale FZ1
Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/#findComment-2956834
Share on other sites

Buy a Z32 air flow meter and retune the safc to suit?

tune it at say 12psi and keep it there (stnd turbo)

or tune it at 14psi, your call

If you want 14psi talk to Slide about a highflow :happy:

that'd sort out alllll the issues, Im sure

* could possibly be the stnd afm maxxing out at the points you mention..................

Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/#findComment-2957202
Share on other sites

tune it at say 12psi and keep it there (stnd turbo)

or tune it at 14psi, your call

If you want 14psi talk to Slide about a highflow :happy:

that'd sort out alllll the issues, Im sure

* could possibly be the stnd afm maxxing out at the points you mention..................

I'd agree there is a good chance of failure if he's wanting to run it at 14. I wasn't prepared to run mine any higher than stock, knowing that elevated speeds would eventually result in the turbine rotor parting company with the shaft.

Slide's product would be a useful upgrade, but quite frankly a useless change unless the ECU is able to support it. And it seems that the ECU currently won't handle the mass air flow capacity of a stock turbo @ 14psi.

It's not a case of the AFM "maxing out" though, just exceeding tuner defined parameters within the ECU settings at those lower engine speed ranges.

Link to comment
https://www.sau.com.au/forums/topic/159298-funny-surge/#findComment-2957248
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

    • Welcome!  How long have you had it? And what colour is it?
    • "CAD" version 1.0 It will have a 15mm lip around the top for 6 × 5 or 6mm nutserts and fixtures (two on each of the three straight edges), and some pinch weld on any exposed edges, it has three mounting points, one of the power steering reservoir bolts, and two on the rad support, my 120mm hole saw will make short work of hole for the silicone joiner, with ample room for some pinch weld  I've also got enough Carbuilders "peel and stick" heat shield to cover the outside of it at the coolant expansion tank and on the engine side, as pictured, and internally on the lid and where the fuse box is, I've also got some thin, about 3mm, black 3M single sided sticky foam stuff that was left over after sealing some door drafts at home to help seal the lid As for the shape, it "sort of" matches the shape of the fuse box, so shouldn't look to "out of place" The lower area and hole for the intake will need pinch weld with a balloon on it to fully seal the hole and bottom of it, that will happen after it has been fabricated so I know exactly what size is required  Filter service has been trialed,  and so far it was a simple process  Just need to get some alloy, and then head into work to use the guillotine and break press in the workshop Hopefully it should be sorted in a week or two Guestimated outlay will be under a $50 for the stuff I don't have on hand (alloy, 6mm nutserts, the pinch weld, and wrinkle paint) Disclaimer: That's what the "voices in my head" are telling me how the filter box should end up getting done......lets see if they know what they are talking about  
    • Have been polishing up the trailer rims as they had been sitting in the shed for a few years and are really in need of some love. This was after a couple of passes with chrome polish - coming up quite well ✅ .
    • Welcome aboard! Is your Skyline auto or manual? I'm assuming manual. Does it have any mods done yet?
    • Hey mate, the brown and grey plugs would usually go to the TPS, brown one goes on the bottom connector and grey is the top but isn't used unless the car is auto, your TPS looks different to mine though I've got a series 2 engine.
×
×
  • Create New...