Jump to content
SAU Community

Recommended Posts

Ever since I ran 1 tank of United Boost 98 in my car it has pinged and knocked like hell when running anything over 10 psi. Putting new Iridium plugs in stopped the knock at anything around 8 psi, but it still knocks like crazy on high boost when previously it was fine. When testing it out after putting in the new plugs I saw a knock level as high as 110 on my PFC hand controller when running about 12 psi!

Obviously I should have thought more about what I was doing when I filled up, but I feel that my fuel pump is probably on the way out too.

I will never run another car on anything with ethanol in it again, just not worth the risk if you have a modified car.

So far I have replaced plugs, next in line will be a new fuel pump. Does anyone think I should check anything else before I shell out for a new pump?

Link to comment
https://www.sau.com.au/forums/topic/207847-united-boost-98-has-killed-my-car/
Share on other sites

It's been proven that if you tune your car specifically to run on boost 98 (10% eth) you will reap rewards. Your tune must have been near the limit ie timing to ping that bad straight away. It'll be all thru you're system, just run another brand thru it to clear it up. BP98 FTW :P

from all of my experiences with tuning and fuel etc

ive found occasionally a bad batch of fuel - all you need to do is back out the timing and then get rid of the dodgy fuel

once that is done you can either try other fuel or back to the same place

in the 4 years ive owned with an aggressive tune ive only seen one batch of crap fuel

i think he said he has finished with the boost98.

I would replace your fuel filter and pray it fixes the problem. if not your going to have to remove the injectors and get them cleaned.

once you have done that then you can look at changing the fuel pump. it shouldnt wreck the pump. maybe the fuel was dirty and it clogged the filter

Thanks for all the responses guys. I should add that I have run quite a few tanks of Mobil and BP 98 Octane through the car since the United debacle.

What confuses me is that the car runs great at 8 psi, yet runs like shit over 10 psi. So basically the only way to diagnose the problem is to systematically replace the components I guess. I don't know a lot about the tuning of the PFC, is it something that I can do myself, or do I need to go back to my tuner and blow another $150?

try new coils if you are sure the plugs are spot on and correct

my coils died - one day they are perfect, the next day the car detonates its ass off on high boost

dropping boost makes the problem go away

try new coils if you are sure the plugs are spot on and correct

my coils died - one day they are perfect, the next day the car detonates its ass off on high boost

dropping boost makes the problem go away

Haha, I was worried you were going to say that. Laughs aside, thanks to everyone who has contributed to this thread.

Do you (or anyone else) have any suggestions for what coils I should consider?

Go with Nissan stock ones, or after market like Splitfire etc?

Oh I might replace the fuel filter first and pray :)

it wont be the fuel filter - i fail to see how this is causing the problem you are experiecing

if the fuel filter was blocking fuel the car would be lacking fuel on full load

this would mean it would lean out which would skyrocket the exhaust gas temps, which would cause engine failure

given your engine still works it doesnt sound likely

go for splitfires - dont get stock ones you would be mad to do that

when my knock count went bad it turned out to be the fuel pump running out of puff, to make it worse the knob who sold me the car told me it had a bosch high pressure pump in there and it turned out to be stock, anyway wouldnt hurt to change fuel filter and pump!

i would start at the basics first. there is no reason why you need to replace expensive parts if you have not checked the simple things first.

dodgy fuel pump or blocked filter can cause high knock levels. even pull the filter out and blow through it. it must not be hard to blow through at all.

Before you go buying new coild, check out some of the DIY's on the subject. Sometimes tape around the coils, or even nail polish will work.

Have a quick search in the DIY section, you should find something useful.

Ever since I ran 1 tank of United Boost 98 in my car it has pinged and knocked like hell when running anything over 10 psi. Putting new Iridium plugs in stopped the knock at anything around 8 psi, but it still knocks like crazy on high boost when previously it was fine. When testing it out after putting in the new plugs I saw a knock level as high as 110 on my PFC hand controller when running about 12 psi!

Obviously I should have thought more about what I was doing when I filled up, but I feel that my fuel pump is probably on the way out too.

I will never run another car on anything with ethanol in it again, just not worth the risk if you have a modified car.

So far I have replaced plugs, next in line will be a new fuel pump. Does anyone think I should check anything else before I shell out for a new pump?

just a question, which United station did you get your fuel from?

and when?

Yeh, after looking at prices I think I might try some cheap fixes first. If they don't help then maybe I should take it to my mechanic and see what he reckons.

Thanks for all the tips guys, now where did I leave that nailpolish...

just a question, which United station did you get your fuel from?

and when?

I bought the fuel from the Mornington United on the corner of Mornington-Tyabb Rd and Racecourse Rd in early January.

And in response to me being keen to spend money on coils, I'm not really, I just don't know a lot about these kind of issues, so I thought that if that was definitely the answer then I may as well do it. But after reading further advice I will obviously try the cheaper options first.

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 am getting the same issue. Did you resolve it? I just got it after installing my new super coppermix and literally the same issue, new fork, new 18mm carrier, release bearing that came with the kit and replicated the exact same sound. 
    • If you like - I have the STL files so I can email em. There's a couple of gotchas (i.e the holes are not threaded so you might need/will need) to utilize some M3 melt-in threads for some of the points. However if you want to be super accurate, and are willing to remove your calipers and your SHOCKS it's a really good tool. You also might need to scale the part that measures the tyre width a bit wider. It defaults to a 7.5in tyre and I mean who is running that. Luckily with the magic of CAD this is very easy to rescale.
    • jeebus. glad you weren't under it while performing the stunt. Also thanks for the link to the wheel measurer, exactly what I needed
    • In the older stuff there were very significant differences 2wd to 4wd, for example Stagea had strut front end for 2wd and double wishbone for 4wd so it was not minor to swap. From poking around the 2wd v37, it *looks* like it might be more possible; some of the parts specifically have "2wd" stamped on them which suggests the platforms are more similar. You'd still want to start with a 4wd half cut to swap stuff from though. I'd suggest if you don't have a tune on the ECU you don't really need one on the trans either. Throttle mapping is in the ECU side (and you can always use a Roar Pedal if you want the throttle to actually respond to your foot), and really if you are happy with the stock power you probably accept the stock trans behaviour too....its all made to be "sporty" not racey.
    • So, updates. I have not washed the car since it came back from Tassie. I've driven it around a bit but not got around to actually sorting it out. I DID raise it because I cracked the rear bar leaving a hotel which was very distressing. Interestingly, the car drives more compliant now that it's raised a fair bit (5mm front, 15mm rear). Also noticed that my FR height was 10mm lower than FL. So that's now sorted out, too. I also bought this and had it printed: https://www.etsy.com/au/listing/1576422240/wheel-and-tire-fitment-tool-universal?ref=shop_home_feat_1&dd=1&logging_key=08f604d9fa4cc383550ba985e6ac85cd5cac7fbb%3A1576422240 Now, if I was smart I would have taken my brake calipers off to actually use this correctly but it was evident enough to me that in the region where the caliper was... there was nothing to hit suspension/guard/arm wise. So I'm going with "it'll be fine" after using the tool to hopefully very precisely measure the wheel clearance. Also while doing this, I had the very VERY bad idea of jacking one of the wheels/suspension arms up while the rest of the car was on jack stands. I did this to see how the arm would travel. This all was well and good until the car slid off the stands and went through a fence. So don't do that. Incredibly nobody was hurt and there was only minor damage to the rear bumper as the car didn't have far to slide, and had 3-4 wheels on it. The only damage turned out to be the fence itself which was easy to fix, and a little bit of damage to the fibreglass rear bumper trim. I had already planned to try a touch up paint kit to fix the time I drove into my garage door to see if it'd help in the interim before I get it fixed properly. I used the Dr Colorchip kit after looking online and seeing everyone talking about it. Yes it's made for chips and not huge broken missing pieces and I'll be 500% recommending it for stone chips after using it for stupid things like me. This took about ... 10 minutes and looking at the half assed photo the 30 second job I did on the bumper corner was almost perfect just by using the tiny little brush and painting it in. The sealact stuff to remove over-painting is really useful, so if/when I do it again I'll likely slather the touch up paint well over it and then clean it up with the cleaning solution. The wheels should arrive in a couple of weeks. I am still kinda confident after doing a stupid amount of measuring (and borrowing a set of 18x10.5+15) that they will not fit because I overlooked something, somehow and flew too close to the sun. ALSO R34 GTR guard liners do not fit on a GTT. I bought the undertray brake duct guides and had the wonderful problem of them not fitting my intake, my oil cooler and the liners themselves were even worse. Attempting to fit them won't work in general - You would have to cut them up as another poster mentioned as the bodywork is different on the GTT. At least I can try to resell them. So instead of cutting those up, I cut up my old already-cut-up GTT liners and extended them by using some PP plastic and drilling some 8mm holes for some nissan clips for the 'extra' bit. Because I was happy to cut them I was able to mount them pretty damn forward so I now have some semblance of guard liners, and the brake vents seal the bumper from the bottom. It sort-of-looks like this, to give some idea - If you look at the GTR and then the GTT this is when I realised that I needed to seriously measure as the inside of the rim area is entirely, entirely, entirely different and could not take any internet measurements for granted.   
×
×
  • Create New...