Zahos

it looks that way, doesn't it.... oh well, I guess other will start posting their experiences once they start using it....

This was measured last dyno tune of the SAFC. (March this year, no modifications done sice) The car pops a little when I hold a gear out to say 4000rpm on low throttle, then change gears, which also tells me it runs a little rich at low rpm. There is no guessing that it runs rich at low rpm.

Sorry Matt, I dont have time to your entire post at the moment, but my A/F ratios are rich at low throttle, and low RPM. They are leaned out from 4500 (or 4200) rpm onwards, at 70% + throttle. It's not just cold start, it stalled just as I can off the freeway after 40 mins of driving, then wouldn't start properly for about 1 minute.

Hey Randy, I changed the fuel filter half way through the tank, and it made no difference. I even chopped up the old one (which was in there just over 10,000 km), and it was relatively clean... The car ran fine for the 3 days before I filled up with this fuel, and it has been running perfectly for the past week and a bit since I filled up on regular optimax. I checked most things I thought were relevant at the time, and found nothing. I cleaned all my electrical plugs (AFM, TPS, CAS, ignitor module) with no difference there. I cleaned the AFM hot wire. I cleaned each coil contact point. I unplugged my SAFC, and let the car run on the standard ECU. Re checked the base timing was at 15deg, at 650 rpm with the AAC valve unplugged. Visually inspected the harness at the coils / ignitor for any fatigue. And recently (couple of months before the problem occured) had my fuel pump tested. Seeing as the car runs just fine now, and that our other car experienced no issues when filled from the same pump, I put it down to my RB25DET being a fussy bitch.

For an octane rating increase of 2, (opposed to regular 98RON optimax) I cant see how I could have had such problems on startup and idle. I never pushed the car past 30% throttle while i had that tank of fuel, as i was worried of any serious permanent damage. NGK BCPR6E gapped at 0.8mm, put it 3 days before that fuel was purchased.

possibly, I'm not ruling that out, but very unlikely b/c I filled my wifes car from the same pump, and it had no problems. I have no idea mate, can't comment. Could be a possibility though b/c my car runs little shitty on BP Ultimate (tried it from 3 different servo's now, and associated problems are consistent), whereas everyone else swears by it.... Yes it is , and Yes I did I was already shitty about someone at work arguing on something (work related) he knew nothing about, and those few responses topped it off..... I know I'm a cranky bastard, but I have a low B/S tollerance at times...

Like I said I know very little about Ethanol.... One thing I can tell you is that ethanol virtually no lubricating properties compared to unleaded fuel (which still has low lubricating properties unless it has a high sulphur content, or some other additive added), so 100% ethanol could cause all sorts of problems like damage to your fuel pump, seizure of the motor, etc.... Why dont you run 100% Ethanol, get your tuner to retune your car, then tell us what happens? If not, why? ok Mr science type guy, my head is out of my arse now, and my eyes are washed, awaiting your response with what it actually does........ I think many comapanies(including nissan) HAVE carried out test, thus not recomending it. They could potentially be up for law suites unless they did.... Try google, there are plenty of articles both for and against ethanol, and I think you will find most articles will tell you that you will have problems similar to what i experienced.... Here is an article i read before i posted anything detailing the problems it can cause to marine outboard engines. I did not want to post it though b/c I'm not sure of the relevancy to automotive engines. So you know this for sure?

Why would you need to retune? You haven't said why, but you sound like you swear by Ethanol.... I never said why it is bad, or that it is bad. I said it recomended our cars dont use it, and gave my experiences with the aleged reasons why we shouldn't use it. This is a good example of what i was talking about yesterday.... Saying ethanol mixtures in your fuel is great, without giving any reasons as to why.... So does every person need to retune their car when they put any fuels containing ethanol in their car. Doesn't sound very reasonable to me. Sounds idiotic to me... And for those that are interested: My car has been tuned for a flat 12:1 A/F ratio from around 4500 rpm onwards, and I did not dare take my car anywhere in that range when driving with that fuel. The problems i had were: - Would not start at times - Would stall on idle - Would stall and start during normal driving (2 - 3000 rpm) I don't know how much of a difference a retune for Ethanol based fuels a car would need at idle / startup, but I'm guessing the difference would be negligable. Anyone who actually knows care to elaborate on that, as I am interested to know.

No I'm not. Obviously you have not paid attention to anything i said. Have a nice day. Bye

if you really want to bother me about it more, send me a PM bye

Don't females have arses? What theory? Did you read this theory? Who wrote it, was it a creditable source? What did this theory say exactly?

Refer to post #30 Not really. There are people quoting it's safe without any evidence. I didn't quote why it is bad either. I regurgetated the car manufacturers recomendation, and explained my experience. I don't care if anyone uses it and gains 5 seconds on their quarter mile pass... infact, good luck to anyone if they do. If you have used it with no problems so far, then I'm happy for you to... (really, I'm not being sarcastic)

Post Deleted. My apologies to Redback for nasty comments...

There are several report floating around that show it causes damage.

Then it's not exactly the same is it. What fact is that assertion based on?

why would a higher RON rated fuel cause problems? If my car is tuned for 98RON, and I use 92RON, then yes it will. But if it is tuned for 98RON, and I use 100RON, then the chances of pinging decrease, not increase. The whole point to all of this is: - Shell brought out a variant of optimax with 5% Ethanol. - Nissan recomends we don't use it - Some of us experienced problems with ethanol blended fuels.

b/c of the ethanol Is this comment based on more research, or again is your arse doing all the talking? How can you determine how often people will re-build their engines?? and secondly, by making that comment you basically admit that you think ethanol WILL cause damage.

Exactly. And Iexperienced the problems mentioned: - difficulty starting - poor drivability

well when i was at 1/4 of a tank, i filled up with regular 98RON optimax, and within 1km of driving, all my problems were solved. Nissan recomends you dont use it, I have provided my experience with this fuel, Just trying to warn others...

Shell has released a new fuel Optimax Exteme. It is at least 100RON blended with 5% ethanol. The shell near my house stocks this fuel and I filled up a tank thinking it was regular optimax. Anyhow, my car stalled, and jerked continuously. It would not start at times, and just ran like crap!!! I highly recomend you do NOT use this fuel in your skyline, or any high performance nissan! I took this from the subaru website, and I guess this also applies to forced induction Nissans also... All model year Liberty B4 and Impreza WRX STi MY99-00 models may experience starting and or drivability concerns if ethanol blended fuel of any level is used and therefore we do not recommend its use. For a list of Shell servo's that stock this fuel, visit the shell australia website, and follow the optimax extreme links.... Z

to put another spin on this.... i have had the same problem lately... I DO NOT have a Power FC (but do have a SAFC2 - had it for 2 years though) Mine starting doing it a few days after changing the plugs, and cleaning the coils. It also started doing it the same day I filled up after letting it go down to just 5 litres of petrol in the tank (late for appointment no time to stop and fillup). And this was only 1km after filling up it started, so i suspect dirty fuel or water in the fuel. I have changed my fuel filter, cleaned all the plugs (ignitor, CAS, AFM) and double checked them to ensure they are secure. I'll clean my AFM, and recheck all connections to spark plugs and coil packs over the weekend. Has any1 dealt with dirty fuel, or water in the fuel tank before? Has any1 tried putting metho in their fuel when they suspected water seeing as water and methylated spirits are miscible? I will post an update if i have any progress....

Yeah clerks was farrrrking boooooring.... I turned it off half way through. Jay & Stoned bob are not funny, they're gay I get it. <{POST_SNAPBACK}> If you like brainless movies, yeah it's boring..... Jay and Silent Bob kick ass... "37??????? <slurp, slurp, slurp>" The only Kevin Smith movie that did bore me a little was Chasing Amy.... Sin City was OK, especially the parts with Mickey Rourke... Favourite scene is where he is driving with the door open at about 100km/h scraping that guy on the road and says: "I dunno about you, but I'm having a ball" And I can't believe someone else has seen the toxic avenger..... That movie was soooooo CRAP, but I pissed myself the whole way through! I love those crappy, Stupid American B grade movies with college chicks and boobies. Favourite part is when he punches that fat guy in the guts, and pulls his intestines out... then the fat guy starts shoving them back into his gut like it's gonna make him better again....

sorry dude, I'm in Melb. I'm sure you can find what u r looking for if you have a bit of a search. I think there is an entire thread dedicated to what you just asked...

that means the clutch plate is faulty (sort of). From what I understand, if it IS that, then it won't cause any damage, it is just an annoyance. Cost to fix is basically replace clutch plate... What clutch do you have? I have a daiken exceedy organic sports clutch.

yeah, I have one too... I have seen quite a few on the prestige motorsport website with sunroofs. Dealers will always say shit like that to make buyers feel special... it's part of their job.