Jump to content
SAU Community

Huge Shot Gun Bang On Boost!

humz

By humz,
in Engines & Forced Induction

 Share

Recommended Posts

TTT Grand Master

TTT

Posted
Posted

just to question everyone with the same problem.

1.) do you have the correct heat range spark plugs?

For those guys with gt30’s and what not, have you tried a $25 set of NGK BCPR7ES-8 (the 7 is the colder heat range,, stock is BCPR6ES which is good enough for mild mods like anything using stock turbo) and the -8 is the 0.8mm gap.

Even try 0.7mm.. I’ve heard of some people going as little as 6.5mm at high power levels.

2.) Have you taped up the coil packs?

It’ll cost you nothing but 30 minutes of your time and you can be sure that the coil packs are not arcing out and making you lose spark.

Yes some of you have said you’ve replaced a couple of them but at idle they might read fine on a multi meter, but under load at hi revs and boost, it’s a different world for them.

Just tape them up to be sure.

You got nothing to lose.

3.) Those of you with AFM still in use… Clean them and resolder them

I keep repeating myself on this topic but it seems that they are logical things to check/do first.

Here is the thread in which I posted more details for something similar.

http://www.skylinesaustralia.com/forums/in...c=122908&hl

Post 5

Mark-R33 Contributor

Mark-R33

Posted
Posted

same prob here too.....popping and then a bang, it was at night and when it went bang i looked in2 the review mirror and saw like lil red dots get sprayed outa the exhaust (prolly red-hot metal)...

i got a stock ecu, cooler, pump, boost at 10psi, pod.....new plugs didnt make a difference

:P

The Dan Grand Master

The Dan

Posted
Posted
Plugs in good condition?

Coils working?

side note 604 - 14psi/gt30/rb25 300rwkw = impossible

Ring 101 motorcafe and talk to Rob. He tuned one a couple of months back with the exact same and it made 302rwkw on 14psi.

The Dan Grand Master

The Dan

Posted
Posted

I would start by doing what Nismoid said...check spark plugs. Then move on to check you fuel setup. Is your pump flowing enough or at all? You need to chekc basics before you start spending a whole day sorting out 'common faults' and hoping you nail it.

WiZardOz Collaborator

WiZardOz

Posted
Posted
i am having the exact same problem...

only under WOT and at high rpm, it starts popping like im bouncing off a rev limiter, very rapidly, it almost sounds like popcorn popping. my sparkplugs are new/gapped...this is pissing me off ;)

I was having this exact problem a couple of months ago :happy: RB25 running 13 psi PFC blah blah blah

problem wasn't as bad as I turned the boost down to 10psi (eboost makes this so easy)

Put a new set of BCPR7ES-11 plugs in (gapped down to 0.8mm) started the car up and it was missing really bad (thought I had stuffed something up)... left it idle for 15 mins in the driveway, turned it off

later in the day when I started it up to go all was fine .. and has never had the problem again

Never understood why it ran so rough when I first started it up after doing the plugs, as before doing it was idling and running fine off boost.

Endless604 Apprentice

Endless604

Posted
Posted
I was having this exact problem a couple of months ago :O RB25 running 13 psi PFC blah blah blah

problem wasn't as bad as I turned the boost down to 10psi (eboost makes this so easy)

Put a new set of BCPR7ES-11 plugs in (gapped down to 0.8mm) started the car up and it was missing really bad (thought I had stuffed something up)... left it idle for 15 mins in the driveway, turned it off

later in the day when I started it up to go all was fine .. and has never had the problem again

Never understood why it ran so rough when I first started it up after doing the plugs, as before doing it was idling and running fine off boost.

I just installed a set of ngk BCPR6E-11 (Copper V-Power) in my rb20det....start it up and it misses BAD. lumpy idle that's shaking the whole car. god. how am i gonna fix this? :laugh:

i hope it'll sort itself out like yours did, but if it doesn't looks like im going to put BCPR5EIX-11's (iridium ix) back in, atleast those didn't miss till 5000+ rpm...

i taped up the coils while i was in there though, so hopefully that rules them out.

Tex Willer Apprentice

Tex Willer

Posted
Posted

We have had some problems with the 1. Generation RB25 (with external coildrivers).

Seems like the spark dissappears over 14 psi boost, even lower on big turboed/hp engines.

Don`t know if it is the coildriver or coil that is the weak link, but most likely the coils.

HKS dli box did not help(as it does on the supra`s)

Generation 2 coils seems better, but probably not working with the external amps.

  • 2 weeks later...
604cefiro Contributor

604cefiro

Posted
Posted

Hey guys,

Thank you VERY much for all the input.

Well a couple days ago we started to play around with the spark plugs / coils.

I replaced my HKS plugs with some NGK heat range 6 (yea i know, too cheap to want to foul expensive plugs right now). Siliconed and cleaned the coils.

I think it was cylinder 2 or 3, the coil looked like it was arcing outwards.

Took it for a spin, 1st gear and 2nd gear was OK. mid to high RPM in 3rd, the car still goes BANG BANG.

I'm thinking of picking up the Splitfire coilpacks, we'll see if that helps any.

  • 4 weeks later...
2_eclipsed Rookie

2_eclipsed

Posted
Posted (edited)

i got the exact same problems as u guys.

i have a stock rb26/T04R/HKS GT waste gate/splitfire coils/NGK plugs heat range 6/stock injectors/stock ecu un-tuned running 1bar.

did everything u guys suggested except changing the spark plugs. will change them l8er this week to heat range 8 with 0.07mm gap.

problem only occurs at WOT(wide open throttle)

but another ploblem is that iam scared shitless to even check if the problem is still there cause i don't want it to go kaboom. i know iam playing with fire but car will be tuned as soon as this problem is solved. just waiting to get power fc.

Edited by 2_eclipsed
2_eclipsed Rookie

2_eclipsed

Posted
Posted

changed my plugs as well to heat range 7 and still haveing the same problem, n e other suggestions. on a side note ill be changing the injectors to 555cc in the next couple of days as i sus my stock ones to be leaking.

james young Apprentice

james young

Posted
Posted

ok i found this

http://www.uniqueautosports.com/pricelists...electronics.htm

the item on top being the BEE*R REV LIMITER

makes the car do exactly what you are all talking about

thought it might help solve your problem.

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

    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      @soviet_merlin Thanks mate!  Nothing too major but will hold me up for a while. I've got lymphomas to get taken off the back of my neck and the middle of my spine which always conjures scary thoughts!  It sounds worse than it is. Yeah great, conjuring more rabbit hole deepening , just what I need! 🤣  
    • RP1421
      S15 Spec R

      By RP1421 · Posted

      I'd argue the F50 kit I got is very good value. For ~2k I got the calipers (refurbed condition), adapters, pads, brake lines, rotors, and top hats. I think you'd be pretty hard to get Evo/GTR/350z brembos + the additional hardware for similar money. Used market for a pair of front calipers alone I've seen tend to run anywhere from $1500-2000 depending on condition.    That said, something like a GTR or 350z brembo is a lot easier to adapt to the Silvia. 
    • Milkmun
      S15 Spec R

      By Milkmun · Posted

      Is there a significant price difference between the Evo/gtr/350z brembos vs the F50? Looks amazing.
    • Dose Pipe Sutututu
      R33 fuel setup

      By Dose Pipe Sutututu · Posted

      I was actually being a tightarse at the time LOL... My OCD is tickling me into running a 2nd 8AN Teflon hose all the way down and removing the 2x OEM hardlines. My other side of my brain is telling me to run 2x hardlines front to back (also acts as a fuel cooler, so win win).
    • RP1421
      S15 Spec R

      By RP1421 · Posted

      As I mentioned in an earlier post, I had some trouble with the Silvia's brakes dragging back in 2023. I managed to sort it out then, but the same problem came back to bite me late last year. Just take a look at the picture – I had a feeling the handbrake was acting up again, and I was right. Anyway, I'd been wanting to upgrade to bigger brakes for a while. Not that the Silvia's brakes were bad, but it was more of a "want" than a "need", you know? It was funny, though – at the time, I couldn't find any Evo Brembos, 350Z Brembos, or GTR Brembos for a decent price (of course, tons of them popped up online after I already bought my kit!). I ended up going with an F50 Brembo kit, which came with adapters, brake lines, 330mm rotors, and top hats. The F50 Brembo caliper was used in a few other cars too, like the FPV. I also decided this was the perfect opportunity to ditch the Silvia's ridiculous rear brakes and that awful handbrake (some of you were definitely right about that!). I picked up some R33 calipers and all the necessary bits – rear drums, backing plates, and new hardware to refurbish the calipers. Of course, it wouldn't be a project without a few hiccups. Turns out the brake master cylinder was playing up and basically (to put it simply) keeping the brakes engaged. I had it overhauled, and after some adjustments, everything was working again. The whole process took a while, as you can imagine. To top it off, the front right wheel bearings were shot and needed replacing too. This is a rare occasion where I'm posting an update while it's all still fresh! These pictures were taken just this afternoon.
×
×
  • Create New...