Jump to content
SAU Community

Recommended Posts

Here we go again did a search and found out backfiring between gear changes.

Looking at getting my first R33 fresh import.

Took it for a testdrive and warmed up the engine to normal operating temp, and you give it a bootfull and your head learches forward like you hit reverse gear, and than wham ya head gets ripped back into the seat like whiplash almost. Dosnt matter what rev range you do it.

Sometimes it will do a backfire on aceleration and a huge cloud of black smoke comes out of the exhaust (still has jap fuel in it not sure if it is this).

Get this lifted the bonnet and found a hose 3/8 size lying their not connected to anything (around turbo area) could this be the problem??????, hope so as this is a nice car for the price and i got to see and drive before it was complianced and detailed (still had those hard jap tyres on it, pretty much straight of the boat).

Thanks

Edited by Yme33
Link to comment
https://www.sau.com.au/forums/topic/165993-backfire-whiplash/
Share on other sites

Umm that hose is probably meant for the wastegate actuator. Sounds like you're hitting Rich & Retard (fuel cut), if that hose is indeed meant for the actuator then the turbo will be spooling uncontrollably, making way too much boost which will cause the ECU to read an overvoltage from the AFM and throw itself into R&R.

If that is the case, my guess is the car had an electronic boost controller which was removed by a complete monkey :P

It sound as if the fuel injector are either pumping too little or too much petrol... I would check the fuel pumps... I had this problem before... changed fuel pumps and it runds fine now... also, remember to use high octane petrol... if you running anything but high octane petrol it will hinder performance heaps...

good luck bro... try this and then tell me how you go...

I dont think he has wound the boost up, I think it's more a case of his wastegate actuator isn't connected to anything (the loose hose he found) and is boosting uncontrollably. I'm not sure where the 33 gets it's pressure signal from.. pretty sure it's different to my 32 which has the pressure nipple on the compressor housing.

That's what I'm trying to say :( Someone needs to tell him where exactly the wastegate actuator hoses go so he can check if that's what the loose hose is.. I have a 32 so I can't tell him as I don't have the dual stage solenoid etc etc.

If its been disconected for a while and it is the hose im talking about it means that whole time its been running unlimited boost. It may have done damage it may not have, it depends on the driving habits of people using the car while its been in this state. Get it checked out before you hand over your hard earned cash.

what is with this term "fresh import". they are second hand cars.... they were just driven in jp and new to aus... what ... people in jp dont thrash thier cars..... so wierd people talk about fresh imports as if they are new cars... particularly car salesmen eh

what is with this term "fresh import". they are second hand cars.... they were just driven in jp and new to aus... what ... people in jp dont thrash thier cars..... so wierd people talk about fresh imports as if they are new cars... particularly car salesmen eh

I know they are second hand but it is tuffer for a frsh import to get complianced than the dodgy road worthy off that guy for a carton of beer

what is with this term "fresh import". they are second hand cars.... they were just driven in jp and new to aus... what ... people in jp dont thrash thier cars..... so wierd people talk about fresh imports as if they are new cars... particularly car salesmen eh

When people use the term "fresh" they generally mean its fresh to australia not that its a brand new car.

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


  • Latest Posts

    • My thinking is that if the O2 sensor is shot then your entire above described experience is pure placebo.
    • Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
    • -10 is plenty for running to an oil cooler. When you look at oil feeds, like power steering feeds, they're much smaller, and then just a larger hose size to move volume in less pressure. No need for -12. Even on the race cars, like Duncans, and endurance cars, most of them are all running -10 and everything works perfectly fine, temps are under control, and there's no restrictions.
    • Update: O2 sensor in my downpipe turned out to be faulty when I plugged in to the Haltech software. Was getting a "open circuit" warning. Tons of carbon buildup on it, probably from when I was running rich for a while before getting it corrected. Replaced with new unit and test drove again. The shuffle still happens, albeit far less now. I am not able to replicate it as reliably and it no longer happens at the same RPM levels as before. The only time I was able to hear it was in 5th going uphill and another time in 5th where there was no noticeable incline but applying more throttle first sped it up and then cleared it. Then once in 4th when I slightly lifted the throttle going over a bump but cleared right after. My understanding is that with the O2 sensor out, the ECU relies entirely on the MAP tune and isn't able to make its small adjustments based on the sensors reading. All in all, a big improvement, though not the silver bullet. Will try validating the actuators are set up correctly, and potentially setting up shop time to tune the boost controller on closed loop rather than the open loop it is set to now. Think if it's set up on closed loop to take the O2 reading, that should deal with these last bits. Will try to update again as I go. 
×
×
  • Create New...