[s33gav]

Just talk to your bloody engine tuner. Tell him the problem and ask for his advise on the matter, simple!!

Edit: I missed the complete second page of this page, so missed the fact you've now done that, oops, I jumped the gun sorry

[DaFlake]

Quote: Originally Posted by s33gav (original)

Just talk to your bloody engine tuner. Tell him the problem and ask for his advise on the matter, simple!!

Edit: I missed the complete second page of this page, so missed the fact you've now done that, oops, I jumped the gun sorry

Doh! It happens....

[roland2003]

Hi, yes US octane is Ron+Mon divided by 2. Ron & Mon are typically 10 points apart with pump fuels.
therefore US 91= European 96 Ron. US 93=European 99Ron.
Best Regards Roland GTT

[Meeerrrk]

Cooper S with 220kit (plus a couple of other bits)
i was told by GTT that running WOT in 5th & 6th gear is a big no no, so i dont. sometimes i wish i could ( i ALWAYS use optimax/tesco 99; im lucky i have both very close to me)
what is the best fix for this, bigger injectors? i remember GTT saying a remap will not help, infact it may make it worse?
any ideas?

[Richard Crofts]

Bigger injectors wont do a great deal. Roland himself has tested stock against jcwe and proved that until over 6k the fuel mix is almnost identical on either set.

[Revolution Mini Works]

Quote: Originally Posted by robbo mcs (original)

Hi,

There are different standards in different countries. 98RON UK / Australia = 91 USA.

Cheers

Robbo

I believe paul webster said that 95Ron was equal to our 91 but I hear what you are saying

[Paul Webster]

The spread between the two numbers is know as the fuels sensitivity, and it is very important. Because of the variety of engines it is possible for a petrol manufacturer to come up with a fuel that has a high RON, but a lower than expected MON. Hence although it looks normal on the pump it may perform badly. However on another day the same company may make its fuel out of a different blend to get the same RON but a different MON. This is done for profit reasons and is why you occasionally get bad fuel even though it is legally rated the same. In the past with high leaded fuels nobody noticed but nowadays high performance cars do notice (The Molemobile has just had a particularly bad batch from Total, and has been pinking all week)

In America the service stations use the Pump Octane Number or PON rather than RON. this is the average of RON and MON and gives a much better grade, and is also why the American gas always seems not as good as our when in fact it is is the same (and has better quality control). But even this system can be abused by adding octane boosters to poor fuel.

Below is an approximate comparison chart, these numbers can vary by as much as 2 grades

RON 90 92 95 96 98 100 105 110
MON 83 85 87 88 90 91.5 95 99
PON 86.6 88.5 91 92 94 95.8 100 104.5


I lifted this off someone elses website
.

[roland2003]

Hi, yes and as a general rule (for what we want) the MON is the more important number. The US system of the mean average of Mon & Ron ratings is preferable for 'seeing what your buying' to our European system.
MON is a higher speed test. All race fuels quote the Ron& the Mon.
Best Regards Roland GTT

[Meeerrrk]

Quote: Originally Posted by Richard Crofts (original)

Bigger injectors wont do a great deal. Roland himself has tested stock against jcwe and proved that until over 6k the fuel mix is almnost identical on either set.

ok, so what do i need to do?

[roland2003]

In situations where you need (& can legally use ) WOT at high revs in 5th/6th gear,on any modded MCS use Aldon octane booster at about 40:1 mix.
So if you do a trackday just put 1 litre (about £9 ) in with three quarters tank of Shell V power or Tesco 99.
JCW injectors will also give more headroom at near peak revs too, so is a good mod for regular trackday warriors.
GTT Adjustable fuel pressure regulator (coming soon) ,is a must for track days etc. You can even up the fuelling for the track, then back it down to nominal afterwards.
Best Regards Roland GTT

[Richard Crofts]

Ohhhh that sounds like big fun

I thought as much from yiour previous stuff Roland...JCWs are only really better for fueling once your above the 5.5-6k rpm mark. Even then stock are ok unless you are consistently above that rpm level (such as on a track day)?!

So octane booster is pretty much the lot except for some rather costly ECu mapping on a proper rig and not a generic map.

[Bhozar]

I picked up some of that NOS octanle booster from Halfords recently. Havent had chance to try it yet. Halfords is totaly useless at having decent selection of anything good.

[roland2003]

Hi guys, when you buy Octane Booster, make sure it is PURE octane booster, as a lot are fuel enhancers 'containing octane booster'. Containing may mean 3 drips per litre, which is not alot of help. Aldon is realy good and good value. If you handle it carelessly you will turn into a mutant and grow extra heads & arms.....In other words its VERy nasty stuff....handle carefully.
One problem with sustained high speed /high load is the inlet temps going up, the ecu will knock back the timing,which helps, but richer mixture and/or octane booster will help keep detonation at bay even more effectivley.. Most road remaps dont run enough fuel for racing, for the road fuel consumpsion would be poor.
Best Regards Roland GTT

[Bhozar]

Quote: Originally Posted by roland2003 (original)

Hi guys, when you buy Octane Booster, make sure it is PURE octane booster, as a lot are fuel enhancers 'containing octane booster'. Containing may mean 3 drips per litre, which is not alot of help. Aldon is realy good and good value. If you handle it carelessly you will turn into a mutant and grow extra heads & arms.....In other words its VERy nasty stuff....handle carefully.
One problem with sustained high speed /high load is the inlet temps going up, the ecu will knock back the timing,which helps, but richer mixture and/or octane booster will help keep detonation at bay even more effectivley.. Most road remaps dont run enough fuel for racing, for the road fuel consumpsion would be poor.
Best Regards Roland GTT

Thanks for that. I have bookmarked their site. That octane booster is such evil stuff they cant send it through the post. I would have to go collect it myself from them. Luckily they are only an hour away.

[sef]

An extra arm might prove useful... Bit drastic tho...

[roland2003]

Heres another 'mutant moment' tale . It was when we drained off the aircon on our TT a few years ago. We just cut the pipes & the whole workshop filled with green smoke, I couldnt see a thing, I ran to the other end of the workshop, After a minutes silence , I knew nothing human could possibly have survived, but I could just make out this figure walking towards me ,it was hideous,six foot seven high, with 3 or 4 arms and like a zombie. I was just about to run for my life when I realised it was only GTT John

[Meeerrrk]

lol sounds like a friendly chap!!

So, as far as giving my car a good thrash (where legally allowed) above 4th gear then i really need to ensure i use that 3rd arm to lean out the window, tip a bottle of aldon octane booster in and shift up into 5th gear....that's gonna take some practice you know

[roland2003]

. Hi,..bigger more efficient intercooler, &bigger injectors both give more headroom. Octane booster isnt 'essential.'. just recommended ..Im sure dozens of our customers have taken their cars to 140+mph anyway, its just insurance against detonation occuring if the fuels not what it should be . Our GTT300T for example has big front mount intercooler and runs huge injectors . Even on pump fuel at very high boost pressure it just will not pink let alone detonate.
Best Regards Roland GTT

[Meeerrrk]

interesting, thanks. A intercooler is next on my list, i had the GT220 kit originally, ive now fitted your re-route pipe and i think the intercooler is the next step. (just dont tell my mrs, she would rather have a new sofa or something like that?!)