Shell Optimax Extreme 100ron

[Cubes]

i blame that on every 1 else not keeping up when i gunned it so i went slow after that and early on in the cruise we had a spot of rain

yer those stagea drivers.. heheh

Ahh wasn't too bad.. Was fairly brisk at times then at other times it felt as if we were not moving.

[Madaz]

lol dont let tangles see that

[Cubes]

hehe thats who I was stirring.

[pixel8r]

yer those stagea drivers.. heheh

Ahh wasn't too bad.. Was fairly brisk at times then at other times it felt as if we were not moving.

hey!!

i thought we did a pretty good job of keeping up...except for getting stuck behind a terribly slow 4wd going up mt lofty - double lines all the way. After that things picked up a bit...

Very nice drive, and i was very impressed to experience how well the stagea handles. Its just sooo much more than just a family wagon!!

[DriftR_33]

my fc was tuned with bp ultamate and bit of octance booster, it drives ok on lower octance but when i boost it shows increased knock and slugish.

so im keen to see this new optimax :sorcerer:

[Cubes]

I've came across a few posts where 'Tuna' (Who I believe is Martin Donnan) tested BOOST98 and found it provided more power over other PULP fuels.

I've just dropped $30 in an empty tank, I will check out if it affects ign. timing tomorrow.

Apparently cleans your fuel system right up so its recommended to change your fuel filter after a tank of the stuff.

[Busky2k]

Also I've found that Boost98 hasn't had any effect on how much my engine pings. Damn. However its good stuff its a lot cheaper than BP Ultimate and the rest and the station is only 100m from where I live. But I have a strange feeling that its only me that ever buys Boost98 there so I begin to wonder how old the stuff is.

[Madaz]

my dad works for mobil and says it would be very rare that it would just sit there Busk2k

i sits in the storage tanks @ the terminals for ages b4 getting to the servo's 1 would suggest it doesnt have a shelf life

[sky30]

I've came across a few posts where 'Tuna' (Who I believe is Martin Donnan) tested BOOST98 and found it provided more power over other PULP fuels.

I've just dropped $30 in an empty tank, I will check out if it affects ign. timing tomorrow.

Apparently cleans your fuel system right up so its recommended to change your fuel filter after a tank of the stuff.

Im pretty sure the boost98 runs a little leaner so you probably need to richen it up slightly, but it can handle a fair bit more timing.

Let us know how you go joel. Dyno before and after???

[Cubes]

A quote from Mr. Chops this time last year.

Ok, I have done a little bit more research on this fuel.

Speaking to Martin Donnon today, it turns out this fuel CAN be a good thing. If tuned for this "boost 98" every car he's seen has picked up power in comparison to regular 98 octane fuel.

There is a catch however. He showed me some dyno graphs, and just by changing to this from another 98RON fuel, the car LEANED OUT BY A FULL AFR POINT (ie 12.5-13.5).

This would explain the increase in performance experienced by owners of cars with factory style rich tunes, but if your car is tuned on regular 98, and is "on the edge" I would steer clear, it could give you problems.

A full point is a hell of a lot.

[Busky2k]

I dont understand. If its tuned to the edge then the Boost98 should do better. Isn't that the whole point? Ie winding in more timing/leaning it out. Although I bet if you leaned out most cars by a full AFR point you'll end up pulling timing, not adding it in.

[Cubes]

Well thats just it...

If it has leaned the car out and still running the usual ign. timing and not pinging then there is definitely room for improvement by dropping the afr back down to 12-12.5 and dialing in more ign. timing.

All though mr. Chops is a reliable source I almost find it hard to believe that it will lean it out by a full point. I've richened it up by half a point (without wideband guestimating) and will see what ign. it will take.

All though last night I gave it a little squirt after dropping boost98 in and felt a little lean spot after 5000-5500rpm.

No det just had that lean feel if you know what I mean.

I guess to know the lean feel takes many years of being a fiddler. lmao.

[J_Red33]

Some interesting comments on this stuff.

I would have thought that the idea when using a higher grade fuel was to maintain the same AFR while producing more power. To do this you then have to advance the timing due to the longer burn time. The effectiveness of it then comes down to the fact that you need less of it to maintain the AFR, you can fit more air in the cylinder for a bigger bang & therefore create more power.

I have done a fair bit of reading & research as well as having a bit of experience on this subject, & this is my understanding on how it works. Leaning out sounds like a bit of a worry, like the fuel is actually a lower octane rather than higher. Confusing

Edited September 2, 2006 by JazzaR33

[Cubes]

I ended up using the Boost98 up as quickly as possible as it made my external bosch pump noisy.

Some who have a bosch pump may know of the sound I speak of. It usually only makes the louder buzzing, airating type noises on hotter days after a long drive.

This fuel for what ever reason made the pump do it all the time.

I didn't have any luck from a seat of the pants point of view richening up the mixture, dialing in more ign (managed to get another 3degree's in) and feeling more go, it still felt not as rev happy.

However.... Leaving ign and fuel as it is and dialing in more boost saw another 2psi being pushed in before I began to see signs of det and it definitely did feel better.

Dropping BP 98 straight in after saw increased levels of det with the increased boost level. The fuel pump also instantly shut up and has stayed quiet since.

Without a wideband I can't do anything.. Boost98 really does need to see the dyno.

If it wasn't for the fuel pump noise when running Boost98 I would stick with it.

[Busky2k]

What Bosch pump are you using?

[9krpm]

Also I've found that Boost98 hasn't had any effect on how much my engine pings. Damn. However its good stuff its a lot cheaper than BP Ultimate and the rest and the station is only 100m from where I live. But I have a strange feeling that its only me that ever buys Boost98 there so I begin to wonder how old the stuff is.

I used to buy it from there too busky

Just make sure you check your AF Busky. Martin tested and tuned a lot of cars on boost98 when the fuel first came out. He found that the car runs fairly lean with the extra oxygen in the fuel. Your knock might be ok but the cylinders and exh temp might be dangerously high.

I've been using Boost98 on the my R32 almost since I got the car. Great power gain after Martin tuned it for this fuel. I use Shell Extreme when ever I go to the track up here. The car seems to like the extra RON. You guys will love it when it's on the pump.

[Cubes]

What Bosch pump are you using?

I'm running a 4.5yr old Bosch 910 thats done somewhere around 140,000-150,000km's.

Its a little long in the tooth. I'm going to have shaun fit an 044 intank as he is able to get them in there and keep them quiet. Bl4ck32's 044 is silent compared to my 910.

[sky30]

when you going to do a before and after on the dyno joel??

I wouldnt be too concerned about the fuel pump noise, my bosch pump does it from time to time.

[Cubes]

Well I was going to drop the Boost98 idea and wait for the extreme 100 gear but after driving today it appears at the higher the boost level requires .... 3degree's retard to stop det from the previous boost98.

I think i'll give this boost98 gear a go. I'll have a chat to shaun see when I can sort out a bit of dyno time to do the back to back.

[J_Red33]

I ended up using the Boost98 up as quickly as possible as it made my external bosch pump noisy.

Some who have a bosch pump may know of the sound I speak of. It usually only makes the louder buzzing, airating type noises on hotter days after a long drive.

This fuel for what ever reason made the pump do it all the time.

I didn't have any luck from a seat of the pants point of view richening up the mixture, dialing in more ign (managed to get another 3degree's in) and feeling more go, it still felt not as rev happy.

However.... Leaving ign and fuel as it is and dialing in more boost saw another 2psi being pushed in before I began to see signs of det and it definitely did feel better.

Dropping BP 98 straight in after saw increased levels of det with the increased boost level. The fuel pump also instantly shut up and has stayed quiet since.

Without a wideband I can't do anything.. Boost98 really does need to see the dyno.

If it wasn't for the fuel pump noise when running Boost98 I would stick with it.

You may find the main reason the pump was noisy is either 1 of 2 things: Either the Boost98 fuel is more prone to cavitation with the ethanol in it, or the ethanol fuel itself is less lubracative, meaning the brushes & bearings are wearing faster & therefore making more noise. Either way it doesn't sound like a good thing.

4 & a half years isn't that long for a fuel pump though should have a bit of life in it yet.

The other thing with the ignition timing, I read somewhere that ethanol actually burns faster than petrol due to it not being in great long chains like high octane petrol, so in theory this would mean you actually have to retard the timing a bit anyway for the same amount of fuel would it not?

Edited September 3, 2006 by JazzaR33