Darren198712 I also heard that the Mitsu's Evo's and Scoobies are designed to use 97+[/QUOTE said:
I remember reading in evo ages ago about the super unleaded thing and they did a shootout. Can't remember what car they ran it on tho which isn't much use, the bp ultimate won and gave an extra 2bhp or something like that over standard. Will have a look for the mag. They had a big write up on it.
I use it if I can but I don't go out my way to get it. I ran tesco 99 for 3 tanks in a row and it seemed a bit more responsive. I've read and I don't know if I agree, is that it takes time for the ECU to adjust to the new fuel. and you should run it for a couple of tanks. I also reckon you need to have as little fuel as possible in the tank when u fill up otherwise you won't get the same effect. Just thinking out loud
I run the bp ultimate in my bike and i can tell a difference on that, its much smoother.
**EDIT**
Found the power figures in the EVO forums but it still doesn'tt tell you what car
Tesco 95 - 205bhp / 234 torques
BP 95 - 204bhp / 242 torques
Shell Optimax - 209bhp / 242 torques
Tesco 99 - 212bhp / 242 torques
BP Ultimate - 212bhp / 252 torques
I use it if I can but I don't go out my way to get it. I ran tesco 99 for 3 tanks in a row and it seemed a bit more responsive. I've read and I don't know if I agree, is that it takes time for the ECU to adjust to the new fuel. and you should run it for a couple of tanks. I also reckon you need to have as little fuel as possible in the tank when u fill up otherwise you won't get the same effect. Just thinking out loud
I run the bp ultimate in my bike and i can tell a difference on that, its much smoother.
**EDIT**
Found the power figures in the EVO forums but it still doesn'tt tell you what car
Tesco 95 - 205bhp / 234 torques
BP 95 - 204bhp / 242 torques
Shell Optimax - 209bhp / 242 torques
Tesco 99 - 212bhp / 242 torques
BP Ultimate - 212bhp / 252 torques
The Infiniti G20 ONLY comes with the SR20DE.Awooga Guy said:So does that above bulletin apply to the SR20 engine? /noob
The cleaners they aren't recommending is the stuff they use in dealerships in the US where they pump neat solution through the injectors I believe.
I still wouldn't use the in-tank cleaners too.
Check this link out if you doubt it!
http://fifthgear.five.tv/jsp/5gmain.jsp?lnk=601&featureid=143&pageid=273
take a look at this, shows that there is not neccessarily any noticeable difference in something like a 1.4 but in something designed to be more sporty then you can see the benefits.
Personally i always used tesco's fuel and occassionally tried bpultimate or optimax and never really noticed any improvment.
When there was the thing about super market fuels in the news i decided to try v-power regularly and i have noticed loads of difference.(i think its cos your ecu learns)
it costs me about £2 difference a tank and i was getting a return of 26mpg where as now i am getting 34mpg and i had my best of 36mpg.
i won't be going back to standard.
http://fifthgear.five.tv/jsp/5gmain.jsp?lnk=601&featureid=143&pageid=273
take a look at this, shows that there is not neccessarily any noticeable difference in something like a 1.4 but in something designed to be more sporty then you can see the benefits.
Personally i always used tesco's fuel and occassionally tried bpultimate or optimax and never really noticed any improvment.
When there was the thing about super market fuels in the news i decided to try v-power regularly and i have noticed loads of difference.(i think its cos your ecu learns)
it costs me about £2 difference a tank and i was getting a return of 26mpg where as now i am getting 34mpg and i had my best of 36mpg.
i won't be going back to standard.
i'm guessing that the ecu doesn't learn, what infact happens is if you put one tankfull of vpower in, there is still remains of the old fuel that was in... so it will mix.. but four or five tankfulls should completely clear it...
the simple way to describe it, is if you get a clear bottle with a coloured liquid in, and then fill it with water and keep the tap running, it takes a while before it becomes pure water
the simple way to describe it, is if you get a clear bottle with a coloured liquid in, and then fill it with water and keep the tap running, it takes a while before it becomes pure water
Did you also notice the cars that gain power are turbochargedw4rdy said:
The increased inlet charge temp and pressure are more prone to knock.Advance your timing to take advantage of the increased knock resistance and then you'll gain power. Pointless just sticking it in and expecting the car to do something magical. If the ECU isn't retarding the timing due to sensing knock then how do you expect it to advance the timing on it's own ??
I know Colin on NPOC has been religously keeping track of MPG with different fuels and the difference isn't anything to shout about. Some tankfulls of 95RON do better than the super fuels and vice-versa.
The Fifthgear link states "And because modern cars adjust their timing according to the fuel they're using, we reset the ECU, to make sure the next fuel would start from a level playing field." So appears the car can adjust the timing to the RON to extract the best performance. Shame they didn't have a non turbo car tho'.
Personally when i've used Optimax i've def got a better return on a tank from 280 to around 310+. Car felt more responsive too tho' this could of well been psychosamatic due to spending an extra £3!
Personally when i've used Optimax i've def got a better return on a tank from 280 to around 310+. Car felt more responsive too tho' this could of well been psychosamatic due to spending an extra £3!
The ECU has no way of knowing what fuel you have in it. It's not going to magically advance the timing depending on what fuel you use. If the engine is knocking on normal fuel because you have advanced the timing then the ECU will retard the timing, putting higher octane fuel in will stop the knock and allow the timing to revert back to std that is all.hmatt said:
You think a N15 has a modern ECU ??
It's OBD-I, the N16 has a more modern ECU with OBD-II.
J
johnbwoy
Guest
who gives a wotsit about usa? not like your cars ever gonna be used in usa...the larger the engine the more effect high octane will have, i believe and espcially if its tuned for high octane! i get better mpg and its def smoother on shell optimax. as for supermarket fule i stay well clear after hearing bout morrisions and tesco putting silicone in their cheap as chips fuel..petrols pretty much the same all over uk...its what the companys add the fuel that makes the difference...but i could be wrong!
johnbwoy said:
Not especially if it's tuned for high octane...only if it is
High octane without adjusting the timing is a waste and could even produce less power. The higher octane fuel burns slower...hence why it's more resistant to knock. If you don't advance the timing then the fuel will still be burning after the piston has gone past the point where it needs to.