Jump to content
SAU Community

Recommended Posts

does anyone know what cause the car to idle to hunt after installing the HKS Twin Power.

Car is r33 gtst with the usual mods with new splitfire coil pack. With the twin power i can run 1.1mm plug gap and no miss at 23psi and seems to run smooth everywhere except when idling.

any help would be appreciated!

I have checked a few times for leaks and seemed to be ok... i will check again over the weekend. I have also plugged back the stock harness last week and it seems to be idling ok but not smooth. Was thinking the hks unit but it seems to run fine to redline with 1.1mm plug gap at 23psi. :wacko:

sorry, i meant stock coil pack harness. have checked TPS-0.45v, clean the AFM, all the hoses, the only thing i haven't clean is idle air control valve. I have also tried richen the AFR to 12.5:1 and reduce mytiming by 2 degrees and lower myidle rpm to 700rpm, which reduce the hunting by 70%, now only a little hunting which still not smooth.

Thanks for all the input guys.

have you tried to adjust the idle screw on the AAC to match the target idle on the PFC?

yes. it's already matched, but have also tried to rise/low the idle above/below the PFC and it was worst to go higher than PFC. I will clean the ACC today sometime and set the timing for lower cell to 15 from 17 (as suggested by DVS32R)and see how it go.

I have a slightly different theory.

While I havent seen the twin power CDI before, I have seen this sort of behavior with other CDI's when the ignition triggering is set incorrectly. The AEM CDI's and MSD CDI's have configurable rising or falling edge triggering. If it is set incorrectly, you idle advance will drift by the effect of the dwell angle the ecu is sending to the coils. This is most noticable at idle, and not noticable at all at higher rpms.

Im pretty sure the R34 coil packs contain a dumb ignitor module and are falling edge triggered. If you are triggering the twin power CDI from the output of the R32/R33 ignitor, then that could explain it. Re-wiring to have it trigger from the ecu directly could resolve the issue.

You wont be able to spot this ignition drift with a timing light aimed at the balancer timing marks as the flurry of sparks the CDI delivers at low RPM makes exact timing impossible to read. The AEM CDI's allow you to disable multispark to set the base timing. I have no idea if the twin power allows you to do the same. I'd figure you would just bypass the twinpower to set the base timing and then re-connect it afterwards.

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

    • I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
×
×
  • Create New...