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Read the WELCOME ALL BMWFANATICS post.
J
Josh-ZN
Guest
seems that the car shuddering under any acceleration was due to a misfire in cylinder 5. bavarian technic software and cable ftw! from what i read this could range from bad gas, old plugs, bad coil, bad injector or bad HPFP :facepalm:
juh, what temperamental machines.
juh, what temperamental machines.
fix the side of the car and take it in to have the engine checked decide after the work is done 
German_spec said:
BMW does not specify what fuel you need to use
but correct me if im wrong...
ed_z
New member
Fouling of Plugs, injectors, can flap, lambda's and o2 sensors will be data logged already so they will check why, they shouldnt take a fuel sample and you can blame it on the poor fuel we have here in SA.
Funny thing is i raced my car the weekend on pump gas and NF race and was getting some error codes on the No2 cat lambda which was sorted after adapting the fuel.
Hope you guys get sorted and glad no one was hurt!
Funny thing is i raced my car the weekend on pump gas and NF race and was getting some error codes on the No2 cat lambda which was sorted after adapting the fuel.
Hope you guys get sorted and glad no one was hurt!
ed_z what do you mean by "adapting the fuel"
J
Josh-ZN
Guest
ok here is a mini-nf ultra review.
the method i used to add the nf ultra was fill the tank half way, add the nf and then fill up to first click. i figured this would be a fairly good way of mixing the nf with the fuel.
didnt take long for the car to boost an extra 2 psi. my 135i was now stupidly fast. relentless acceleration and breaking traction in the first 3 gears in the dry. unbelieveable difference.
just below half way on the tank, the car didnt seem to boost as much. i used the same testing parameters - car warmed up but not hot. weather was cool as it was the day before.
when the tank was nearing the end, the car started its trouble. engine shuddering like crazy with no power but also no error light. i later plugged my bavarian technic cable in and the code indicated misfire in cylinder 5. hasn't done it pre or post nf.
so if you asked me the question, would you recommend nf ultra? My answer at different stages would be:
for the first half of the tank, i would have said, most definitely yes. i dont ever want to be without it in my car. the difference in performance was like going from stock to jb4.
for the second half of the tank, i would say, not really, didnt notice much difference to jb4 and no ob.
for the last bit of the tank just before the low fuel light warning comes on, i would say most definitely not. my car felt broken. i remember at the time thinking about moranor's tow truck thread.
now the problem i experienced could be a mixing issue or maybe even something totally unrelated to the ob. whatever the cause, i would be nervous to use ob again. this may be unfair on octane boosters but one bad experience whether related or not is enough to scare me away. my suggestion to those who want to use ob is to give it a try and see if it works for you. it works for lots of members on this forum. my car had a love/hate relationship with it.
the method i used to add the nf ultra was fill the tank half way, add the nf and then fill up to first click. i figured this would be a fairly good way of mixing the nf with the fuel.
didnt take long for the car to boost an extra 2 psi. my 135i was now stupidly fast. relentless acceleration and breaking traction in the first 3 gears in the dry. unbelieveable difference.
just below half way on the tank, the car didnt seem to boost as much. i used the same testing parameters - car warmed up but not hot. weather was cool as it was the day before.
when the tank was nearing the end, the car started its trouble. engine shuddering like crazy with no power but also no error light. i later plugged my bavarian technic cable in and the code indicated misfire in cylinder 5. hasn't done it pre or post nf.
so if you asked me the question, would you recommend nf ultra? My answer at different stages would be:
for the first half of the tank, i would have said, most definitely yes. i dont ever want to be without it in my car. the difference in performance was like going from stock to jb4.
for the second half of the tank, i would say, not really, didnt notice much difference to jb4 and no ob.
for the last bit of the tank just before the low fuel light warning comes on, i would say most definitely not. my car felt broken. i remember at the time thinking about moranor's tow truck thread.
now the problem i experienced could be a mixing issue or maybe even something totally unrelated to the ob. whatever the cause, i would be nervous to use ob again. this may be unfair on octane boosters but one bad experience whether related or not is enough to scare me away. my suggestion to those who want to use ob is to give it a try and see if it works for you. it works for lots of members on this forum. my car had a love/hate relationship with it.
did you take the car into BMW to see what they could find? Im thinking whatever caused the performance loss halfway though the tank could have been the beginnings of the issues when the tank was low...
please keep us updated if the OB is to blame for this i definitely want to know...
please keep us updated if the OB is to blame for this i definitely want to know...
J
Josh-ZN
Guest
moranor@axis said:
i took it to bmw and they didnt seem too interested in helping. see if it happens again they said. i will take it to a different dealership once the car has been repaired. i am without it for about 3 weeks after that doos crashed into me.
well hopefully the problem is present after you get the car back and BMW find what is causing it quickly...
Agree with Josh. Fueling can be a love - hate relationship. And if you find the right mix and it works for your car stick to it. The JB guys are lucky because they can see what their fueling trims look like by doing a simple log of their car. And if it works...stick with it, unless something better and cheaper comes along :=):
