Jump to content
SAU Community

Recommended Posts

Hey guys,

well as some of you know i have been having a few problems with my car lately,

slowly getting it sorted out, its running a little better than before the only thing wrong now is from standing still and lauching full throttle i get a flat spot after 4000rpm and continues until i change gear but i will get it in 2 and 3rd gear also.

what could it be?

Link to comment
https://www.sau.com.au/forums/topic/48400-flat-spot/
Share on other sites

1) Could be stock ecu boost cut. How much boost are you running?

2) Thats about the time the VVT comes in, So big touque increase which means your spark could be a little weak at that point. What have you set your spark gap to, what is the heat range of your plugs? Try lowwering the gap by 1 mil.

3) There could be a air leak in your intake piping somewhere?

Link to comment
https://www.sau.com.au/forums/topic/48400-flat-spot/#findComment-973507
Share on other sites

1 - you are definately running too rich at that RPM due to your increase in boost. The standard ECU does this. Subsequently, timing is pulled when your car runs this rich and you will get that dreaded flat spot / misfire from ~4000rpm up to ~6000 rpm. 6000rpm - 7000rpm it feels fine, doesn't it?

(search for: misfire boost SAFC hesitation)

2 - You could have some small cracks in your coil packs, causing your spark to jump around there. This ma or MAY NOT be a problem for you...

see this thread for the solution.

The first has been covered HEAPS, as just about every R33 driver has experienced this at some stage, so you should find lots of info...

You will definately need some sort of aftermarket management - PFC OR a piggy back to correct your A/F ratios - SAFC. These 2 are the most common choices, I went for the SAFC as I could not afford the combined price of a PFC and tuning that went along with it. The SAFC II (with installation and tuning) cost about $600 - $650 all up and fixed the problem for me.

Zahos

Link to comment
https://www.sau.com.au/forums/topic/48400-flat-spot/#findComment-973601
Share on other sites

  • 1 year later...

Go the fc...

I found the SAFC to do the job however the difference inbetween price/effort and outcome. The fc does it everytime.

I mean its worth saving the bickies to go the fc for future mods and cost saving in fuel has paid the difference within 6 months...

Link to comment
https://www.sau.com.au/forums/topic/48400-flat-spot/#findComment-1523336
Share on other sites

another vote for the powerFC.

If you decrease your boost to 11psi, and make sure it doesn't go any higher with with spikes etc, the standard ecu will run great.

BUt yeah, I have a powerc, and I'm running a brilliant tune.

Link to comment
https://www.sau.com.au/forums/topic/48400-flat-spot/#findComment-1523464
Share on other sites

Guest
This topic is now closed to further replies.


  • Similar Content

  • Latest Posts

    • So either way it is gearbox out and look what is wrong?  I know about the input shaft bearing. Even before swap/new clutch the it sounded exactly like this: So is that inout shaft bearing or the other was installed backwards?  And can some please tell me the part number for that input shaft bearing? The gearbox is small box from R34 N/A and number is FS5W71C. Thank you  
    • I am yet to see anyone ever regret a quaife or helical. ...other than drifting/skidpan duties. I kind of want to upgrade my factory helical with a Quaife (but really it's not ultimately that different, and is a MASSIVE UNDERTAKING), that's how good the hype is about them, that I want to try them 'just to see'  
    • D2 and Ksport are essentially the same thing and basically just generic Taiwanese manufacture. Better than ChinaBay crap, but... not top shelf. Öhlins have got to be some of the best dampers around, so likely to be a good option. It's going to get to the point though where I suggest you buy from Oz. We have at least 2x excellent options here. If I were you though, I'd be talking to KW about doing something for the R33. There's bugger all difference between that and the 32. In GTR land, anyway.
    • KW only offers a set for the R32 GTR. Popular options are D2 racing, Ksport or Öhlins. I have a D2 Racing coilover set, though I don't know for sure which one.
    • Well, the good news is you have more than one very good option for new coilovers in and around your country. Worth the drive over to KW to talk about GTR stuff.
×
×
  • Create New...