Jump to content
SAU Community

Recommended Posts

Hey guys.

Have an issue with my r33. Lately (last 2 tanks) has been Randomly pinging/ knocking on boost.

When I first heard it, backed off straight away. Temps seemed fine and was driving fine off boost, almost as it hit full boost, would ping. 
Suspecting shit fuel, put in some octane booster, and that seemed to fix it. 
Fueled up at a different servo, and was going better than ever, zero knocks. Put it down to shit fuel.
 

Current Tank is about 1/4 full, rolled on in third coming home tonight and it pinged again.

Car drives fine, and exactly the same everywhere else, no strange noises, temp is fine.

Car has a Vipec plugin, deutchworks 255l/h fuel pump with 14v feed, splitfires, hyper gear turbo, pretty basic setup. 260ish rwkw,  Tuned by Mitch (of haltech)

Car has been the same for the last 2.5 years, parts were new (apart from ecu) at tune time.

Both times it’s happened now, it’s been between 1/4tank and a 1/3 tank of fuel, unsure if that’s linked. Initially thought maybe a shit fuel pump, but thought that would be more consistent

From what I gather the Vipec plug ins don’t have knock protection? Either that if mines not setup. 
 

Will have to head back to tuners I think. I’m guessing if I can hear knock, it’s probably already doing damage. 
 

After first tank with knocking, pulled plugs out (all looked normal) and did compression test, 165-170 across all 6. Top of pistons looked unmarked.

 

Bloody intermittent issues! 
Anyone had a similar intermittent knocking issues/things I should check?

 

Cheers
 

 

 

Link to comment
https://www.sau.com.au/forums/topic/483055-intermittent-pinging/
Share on other sites

On 12/2/2021 at 6:46 AM, Duncan said:

assuming it is not overboosting....

I would change the fuel filter and if possible check fuel pressure under load. 

Not over boosting, boost control is setup through ecu, but have a gauge with recall, I’ve seen 21-22psi before. When it pinged, didn’t get there, was around 17psi.

Yep that’s the train of thought I’m on. (Fuel supply)

Will sort out a fuel pressure gauge, I think my Defi meter has provisions for another pressure sensor, will also check voltage getting to pump.

 

Thanks

If you have oil pressure gauge already plumbed up you have the option of plugging the oil sender port (generally 1/4 BSP) and then plumbing the sensor into the fuel feed to the rail, you would need a T fitting (2x 5/8th barb and 1x 1/4 BSP) which are readily available

On 12/3/2021 at 1:38 AM, Lithium said:

Have you upgraded your CAS setup? There are various options but an aging RB25 and knock on boost has a definite trigger error feel to it 

Easiest way to test is try a fixed timing test like 15 degrees regardless of load/RPM, get a timing light on it and see how much it jumps around while you rev. Load doesn't really affect timing scatter.

  • Like 1
On 03/12/2021 at 11:25 PM, joshuaho96 said:

Load doesn't really affect timing scatter.

Of course not, but knock becomes a lot more likely if you introduce boost to a setup which has erratic timing 

  • Like 2
On 12/5/2021 at 4:56 PM, CEF33Y said:

Stock (old!) CAS, 

It is very inconsistent. will try the timing check and see what I can find.

Thanks

 

If the timing check shows timing bouncing all over the place despite commanding a fixed value in the ECU then the most likely explanation is either the CAS drive pin on the cam has worn, the CAS drive gear has worn, or both. I suspect a number of the more severe cases of timing scatter are actually due to this issue.

  • Like 1

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

    • Hello First, I apologize if this is not the correct forum. Let me know and I will move it to the correct one. I'm having a problem with the tachometer on my Skyline R33 with an RB25DET Neo engine. I'll tell you from the beginning. I'll tell you from the beginning. I have the RB25DET Neo engine installed in a Nissan Patrol GU, with a Link G4X control unit specifically for that engine,  and I have fitted a Skyline R33 tachograph to the original GU dashboard, but it doesn't work properly. I have the tachometer connected to the positive and negative terminals of the GU panel's wiring, and the signal cable is connected directly to the ECU output pin, but the rpm fluctuates widely. Can anyone tell me if the output signal from an R33 ECU is the same as the output signal from an R34 ECU, or if the voltage and signal type are different? Regards and thanks.  
    • I guess it was the thought about "Oh if I were to drive this everyday". Then no, SL500 I wouldn't really consider lmao. 
    • Yeah actually really fair point. Idk what I was thinking when looking at the SL500. Now that I think about it, I feel like I would have more enjoyment out of a shitbox that I would need to repair than some fancy merc. Although I must admit the SL500 does look quite nice. My bad hahaha.
    • 100% Also "Not wanting to spend money" is THE WORST IDEA IMAGINABLE when coming to a project car of any kind. They EXIST to BURN MONEY. Sure, gas money is a thing. A stock car with the worst fuel economy ever sold would probably be cheaper than modifying a car with FREE petrol for the life of your ownership of it, lol.
    • Amount of time you're being observed by law enforcement is so minute, that you could be a dumb shit 90% of your driving time, and never lose a demerit. You could also be the best driver ever and still get hit with a fine.   When you realise how quickly everything turns from "Wee, we're having fun!" To "oh f**k oh f**k oh f**k", you start to realise the only way to be a good driver, is to not be doing anything dumb or unexpected by normies on the road. You want to go fast, go to the track. Someone there in a 1990s slow POS will also show you how bad of a driver you are as they lap 10 seconds per lap quicker than you can in a car that should be considerably faster.
×
×
  • Create New...