Jump to content
SAU Community

Hesitation Between 4 And 5000 Rpm???

SIR33

By SIR33,
in Engines & Forced Induction

 Share

Recommended Posts

R33 Impul Rising Star

R33 Impul

Posted
Posted

I have the same problem got my line put on a dyno to find out WTF was happening, ends up it's running hell rich and is gutsing up. The solution SAFC or aftermarket ECU. I'm seriously looking at a WOLF plug and play, depends what plans you have for your car.

Blitz Grand Master

Blitz

Posted
Posted

I will assume you are running higher than factory boost SIR33.

R33 GTS-T's are notorious for having a flatspot in the rev range due to the timing being retarded when running higher boost.

Power FC is your friend.

justified2.4 Enthusiast

justified2.4

Posted
Posted
its starts boosting then when it hits about 3800-4000rpms it reallly struggles, but then after 5000rpm the boost kicks in hard again. standard boost. exhaust. bov and filter.

cheers

I am having a very similar problem, except occasionally after letting off the throttle it starts stumbling really bad and takes a bit to recover as if the MAF is not working properly.

But like your problem, if I stay on the throttle after hesistation it kicks really hard and often spins tires afterwards.

I am using a Techtom MDM-100 to monitor, and it shows that timing is not being pulled and that it is not leaning out. I checked plugs more than once and they are fine and gapped properly. I am only boosting 10 psi MAX.

I am also now running a z32 MAF along with Apex'i S-AFC to try and fix the problem but that is not changing anything.

Very frustrated and do not know where to look next.

SLY33 Mentor

SLY33

Posted
Posted

Blitz is spot on.

Sir33 you have filter and exhaust, meaning you are no longer running std boost, as due to increasing the flow characteristics you pick up a couple of pounds boost.

I had same prob when i first got mine with the same mods as you, but i had a bleed valve. Mine was more a problem when it was very cold, boost spiked, AFM freaks out and the std ECU pulls back the timing.

Power FC is your very best friend!!! In my opinion if you want to mod change the ecu coz they run SOOO much better when tuned for your mods, even just filter and exhaust. No flat spots, just smooth power all the way to the redline.

GT-Rmgedon Collaborator

GT-Rmgedon

Posted
Posted

I had a similar problem except it was misfiring like crazy. I've got one of those old skool Apexi S-AFC's and whacked the car onto the dyno. Gapped the plugs and advanced the timing ever so slightly - Problem solved. I am running standard ecu 2 as well as aftermarket zorst and filter. I'd be checking what kinda spark plugs you have also if they weren't recently installed.

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

    • The Bogan
      Torana Lx Gtr Hatch, Lots Of Pictures

      By The Bogan · Posted

      LOL, when one "money pit" is never enough Noice, and excellent work mate
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I have more than enough digging, laying blocks, moving gravel, airrating, feeding and top soiling the grass, and setting up the veggie gardens growing some seedlings,  and then removing all the unused rock to keep me busy for the next few months at least,  hopefully the rain stops soon so I can get a few hours in this arvo, but, before that Sunday is washing day, is every body happy, you bet your life we are Nice country road day drives are a day off whenever I'm muscle sore from all the landscaping at the moment, but, more epic multiple day drives will start once the majority of the big jobs outside are completed
    • MBS206
      NC MX5

      By MBS206 · Posted

      I hear that would involve some nice country road drives into the hills for Mark...
    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
×
×
  • Create New...