FOR THOSE WANTING TO KNOW.....
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FOR THOSE WANTING TO KNOW.....
The differences between fuels.
In a copy of Banzia i have just bought there is an interesting read that should quash most oppinions on tesco's 99 ron fuel out performing Shell's optimax and BP's ultimate.
I will bring home the mag tomorrow and post the graphs that they have produced.
Basicly, they took 4 fuels, normal SM 95 ron, Shells optimax, BP's ultimate and Tesco's 99 ron fuels and tested them in an engine on a dyno. its quite an interesting read, so i would recomand buying it.
Results to follow tomorrow if someone hasnt already post them by the time i get in tomorrow.
John
In a copy of Banzia i have just bought there is an interesting read that should quash most oppinions on tesco's 99 ron fuel out performing Shell's optimax and BP's ultimate.
I will bring home the mag tomorrow and post the graphs that they have produced.
Basicly, they took 4 fuels, normal SM 95 ron, Shells optimax, BP's ultimate and Tesco's 99 ron fuels and tested them in an engine on a dyno. its quite an interesting read, so i would recomand buying it.
Results to follow tomorrow if someone hasnt already post them by the time i get in tomorrow.
John
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John look forward to reading the results
Hower how it was mapped would play a biggest part in any variance. if Mapped to 95-98 ron (eg Subaru WRXUK and Subaru STiUK) 98 ron (eg with PPP) or 100ron (STiJDM) IMHO
Bigger power outputs from the greater ron Fuel has never been my intension or need. As lower ron Fuels on high performance Cars is a 5 horse power more on 300+ then "running hot/detting" and melted engines
Tony
Hower how it was mapped would play a biggest part in any variance. if Mapped to 95-98 ron (eg Subaru WRXUK and Subaru STiUK) 98 ron (eg with PPP) or 100ron (STiJDM) IMHO
Bigger power outputs from the greater ron Fuel has never been my intension or need. As lower ron Fuels on high performance Cars is a 5 horse power more on 300+ then "running hot/detting" and melted engines
Tony
Last edited by T5NYW; 17 February 2006 at 11:33 AM.
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not quoting exact figures, but, the engine used was a turbo'd cosworth unit, which was previously dynoed at 500bhp approx.
The were playing with the timing i think, now i dont know a great deal about this area, but it was started at 13 degrees and they were trying to see how far they could advance it if any.
Now from memory, the 95 ron made 518bhp, tescos was 530, ultimate was 540 and optimax was 548.
There was a torque figure given as well but off hand i cant remember. Dont really want to say to much as im not sure of all the data supplied and dont really want to give a half arsed version of the write up like i just have lol
For those that have not read it in the mag, i will post it up tomorrow when i get a chance
John
The were playing with the timing i think, now i dont know a great deal about this area, but it was started at 13 degrees and they were trying to see how far they could advance it if any.
Now from memory, the 95 ron made 518bhp, tescos was 530, ultimate was 540 and optimax was 548.
There was a torque figure given as well but off hand i cant remember. Dont really want to say to much as im not sure of all the data supplied and dont really want to give a half arsed version of the write up like i just have lol
For those that have not read it in the mag, i will post it up tomorrow when i get a chance
John
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I dont see the point in doing things like this, it may show which fuel offers greater potential for bhp, but fuel is so inconsistent even within the same grade that its pointless. I haven't read the article but it sounds as though they have mapped it to within an inch of its life on each of the fuels used, and you cant do this in real world scenarios due to the aforementioned inconsistencies.
#6
To be honest i don't really care what tests say.....it is how each fuel feels in MY car that i am bothered about.
Personally i only use Tesco 99 or Optimax, runs crap on BP.
But i know others say different, and others agree.
Just choose which feels best in your car and stick to that, ignore what magazine tests say.
Personally i only use Tesco 99 or Optimax, runs crap on BP.
But i know others say different, and others agree.
Just choose which feels best in your car and stick to that, ignore what magazine tests say.
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Right the TEST
The test was carried out on a COSWORTH YB engine running 8 green injectors and a roller-bearing T4 turbo at FIELD MOTORSPORTS. The engine was set to run at a constand 6500rpm and 2.0 bar of boost with a ignition value of 13 degrees advance.
Fuels used
supermarket 95 RON
Tescos 99 RON
BP Ultimate 97 RON
Shell Optimax 98 RON
RESULTS
supermarket 95 RON
They could not get the engine to run safely on the 13 deg advance, so it had to be set back @10.75 deg to record a safe power run
At peak power they recorded 516bhp and 417ft/lb torque
Tescos 99 RON
@ 13 deg, a peek power of 521bhp and 421 ft/lb torque was recorded. They could avance it only by 0.75 deg to get a final output of 523bhp and 423 ft/lb torque
BP Ultimate 97 RON
@ 13 deg, a peek power of 530bhp and 428 ft/lb torque was recorded. They could avance by 2.0 deg to get a final output of 537bhp and 434 ft/lb torque
Shell Optimax 98 RON
@ 13 deg, a peek power of 537bhp and 434 ft/lb torque was recorded. They could avance by 3.0 deg to get a final output of 547bhp and 442ft/lb torque
So, there are two sets of figures there to take in. Question is, what is the ignition advance usualy set to on a standard uk impreza??? Im pretty far from an expert on this, but it does look to me that as in terms of the safe running of your engine, BP and optimax are the safer option for cars set at the 13deg marks.
This was just something i found quite an interesting read, the article goes into more detail. Maybe someone with more knowlage than myself can add to this or in fact prove that this test was just a waste of time.
John
The test was carried out on a COSWORTH YB engine running 8 green injectors and a roller-bearing T4 turbo at FIELD MOTORSPORTS. The engine was set to run at a constand 6500rpm and 2.0 bar of boost with a ignition value of 13 degrees advance.
Fuels used
supermarket 95 RON
Tescos 99 RON
BP Ultimate 97 RON
Shell Optimax 98 RON
RESULTS
supermarket 95 RON
They could not get the engine to run safely on the 13 deg advance, so it had to be set back @10.75 deg to record a safe power run
At peak power they recorded 516bhp and 417ft/lb torque
Tescos 99 RON
@ 13 deg, a peek power of 521bhp and 421 ft/lb torque was recorded. They could avance it only by 0.75 deg to get a final output of 523bhp and 423 ft/lb torque
BP Ultimate 97 RON
@ 13 deg, a peek power of 530bhp and 428 ft/lb torque was recorded. They could avance by 2.0 deg to get a final output of 537bhp and 434 ft/lb torque
Shell Optimax 98 RON
@ 13 deg, a peek power of 537bhp and 434 ft/lb torque was recorded. They could avance by 3.0 deg to get a final output of 547bhp and 442ft/lb torque
So, there are two sets of figures there to take in. Question is, what is the ignition advance usualy set to on a standard uk impreza??? Im pretty far from an expert on this, but it does look to me that as in terms of the safe running of your engine, BP and optimax are the safer option for cars set at the 13deg marks.
This was just something i found quite an interesting read, the article goes into more detail. Maybe someone with more knowlage than myself can add to this or in fact prove that this test was just a waste of time.
John
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