bladerider

lol

Thats why you're such a gibbering, twitching, slack brained neanderthal Mycroft. Hardly capable of stringing together a coherent sentence !!!! lol

Do you just rinse, or do you gargle as well??......I think I could do with "brain damage" like yours matey !!

Am I increadibly obtuse or is toluene the last bit of TNT.........and why not just mix a bit of the liquid form of this with some petrol to really get the old motor racing??

Only kidding Mycroft......keep up the good work !

James...............

__________________
The future is bright.........................the future is ORANGE

SP 325i

Sorry to crash this thread but there was a link to it from a BMW forum.
I am also a Chemist so I have read all 13 pages with interest. You guys with turbos, high boost etc have a lot more detonation problems than the NA cars but being into a certain French hot hatch I thought I would add the following insights.

The car was a 1991 205 1.9 Gti. This has a very basic fuel management system. The car was designed to run on min 97 RON fuel. Immediately if the fuel is of lower quality or 95 RON UL is used "pinking " under load can be heard so the ignition is retarded (this has to be done manually remember). The guy (an old school race mechanic) uses a stethoscope to listen for the noise as the timing is changed. I presume this is just a manual version of the knock sensors and then the ECU takes care retardation.
Using this method on old 98RON would get back to OEM spec and Optimax allowed the timing to be slightly in advance.
This is a real world example of "the Mycroft theory", if I am wrong please correct me.
I am now into BMW ownership and have decided to use Optimax instead of 95UL. Reading "being guinea pigs etc " has started to worry me though. I use it for the low sulphur content (BMW owners are paranoid about NIKASIL bore wear) and cleaning properties.

Good thread please keep it going.

Steve

Mycroft

Brought over from another thread on here as it maybe pertinent to this discussion.

This leads on from the Octane booster thread to some extent, so for clarity I'll simply outline how a sensor of this type works;

The oxygen sensor utilises the "Nernst effect." Nernst's law measures the voltage between two materials in close contact, one of which is a known constant. When the sensor reaches a temp. 640degrees F ±25F, it produces a voltage which is interpreted by the ECU and adjusts the fueling to suit.

The outer shell of the sensor is Zirconium Oxide, this material is very sensitive to contamination, think of a nice piece of polished alloy and how easily it will absorb the oil excreted by you skin, well ZircOx will take up all those additives in petrol, but for the most part they don't effect it too badly, but Opt and all those OBs' do contain contaminents and if over applied or applied constantly (as in using Opt continually) the voltage engendered is not as it should be, Citric acid cleans ZircOx perfectly, the acid actually cleans down into this 'rough' surface, we are talking very small scale here, so to the hand it is quite smooth.

Lead, from fuel screws them, Phosphorous (Opt, and most OBs') does the same only slowly, If your turbos have ever blown their seals and blown smoke out the back, the phosphorous in that burn out will kill it fairly quickly, you should always replace the sensor if this has ever happened to you.

dan0h

Mycroft...

As my car is arriving soon I've been looking into ways of getting around having to use Opt or SUL and have been pushed in the direction of the "Broquet Fuel Catalyst" (http://www.broquet.com/), apparantly it was used by Subaru UK to remove pre-ignition problems on early impreza's.

Can you confirm or deny the usefulness of these, will it work, or is it just garbage?!

Cheers,

Dan

__________________
planet dan0h

Dynapack Operator and Engine mapper @ Abbey's ... Responsible for Tim's BNR34 Nur, tokyodrew's BNR34, Rocket Ronnie's 3xTOTB Winning BCNR33, Harry's BCNR33, Big Marks BCNR33, Jae's BCNR33, Zenon's (Nemesis) BCNR33, Ron Kidell's (RK Tuning) BNR32, m6beg's BNR32 & m6beg's missus's GDB Subaru!, Daz's BNR32, Knight's BNR32, GBH Motorsport JZA80 ... And quite a lot of other cars people don't know about...

SurreyPuma

Very simple and very easy!
1.Obtain jerry can,
2.Proceed to a local airfield where they fly 'PISTON' engined aircraft.
3.Squat down under wing and look for fuel drain, which will at lowest point in wing.
4.Turn drain and empty fuel into can(May need a screwdriver but most are hand turnable)
5.Fill can, may take some time!!!

Piston engine aircraft fuel is blue in colour and 100 octane. I imagine u can buy it as it is taxable etc. There are also different grades of Avgas which go up too 115 octane, but ive never seen any.Maybe contact shell or some oil company, 115 fuel is purple colour!!
100 avgas aslo contains small amounts of lead so do not use on a cat car!!!

Have fun

dan0h

I believe you've forgotton steps 6 & 7...

6. Replace destroyed cylinderhead and pistons in 6,000 miles.
7. Make a note never to use AvGas in a road car again.

I've heard all kinds of horror stories about AvGas and its long term effects on road engines. Maybe its just scare stories but I'm not going to try it in an RB motor until someone else does

Good idea though

__________________
planet dan0h

Dynapack Operator and Engine mapper @ Abbey's ... Responsible for Tim's BNR34 Nur, tokyodrew's BNR34, Rocket Ronnie's 3xTOTB Winning BCNR33, Harry's BCNR33, Big Marks BCNR33, Jae's BCNR33, Zenon's (Nemesis) BCNR33, Ron Kidell's (RK Tuning) BNR32, m6beg's BNR32 & m6beg's missus's GDB Subaru!, Daz's BNR32, Knight's BNR32, GBH Motorsport JZA80 ... And quite a lot of other cars people don't know about...

bladerider

lend me your car and i'll try it for you !!!

yer wimp !!!!!

James..........

__________________
The future is bright.........................the future is ORANGE

SurreyPuma

I cannot see the problem with using it as a one off. People mix it for use on jet skis and it keeps light aircraft flying with no problem. I know lots of people who use it in their cars, when i can i use Jet A-1 in my diesel and it makes no difference. All i can say is compare spec sheets on fuels!

dan0h

A-1 Jet is basically parafin though so no harm to a diesel, its just the long term issues I was concerned with ... Although as you say for one offs its probably not an issue... I'll still wait until someone else does it to an RB though

__________________
planet dan0h

Dynapack Operator and Engine mapper @ Abbey's ... Responsible for Tim's BNR34 Nur, tokyodrew's BNR34, Rocket Ronnie's 3xTOTB Winning BCNR33, Harry's BCNR33, Big Marks BCNR33, Jae's BCNR33, Zenon's (Nemesis) BCNR33, Ron Kidell's (RK Tuning) BNR32, m6beg's BNR32 & m6beg's missus's GDB Subaru!, Daz's BNR32, Knight's BNR32, GBH Motorsport JZA80 ... And quite a lot of other cars people don't know about...

R32BigSly

Surreypuma,

Was reading you post with a lot of interest! and you say that avgas does contain a small amount of lead, does this mean i cannot use it in my motor as i have sensors tapped into the zorst for afr, egt etc ect and i was told that AVGAS will put a "coating" on theses sensor and render them useless??

I do not have a cat on the car BTW....

Many Thanks

Stu

Mycroft

Please, if you have a Japanese car made since 1987 then don't even think about fuel with Lead in it, you are playing russian roulette with you engine and your wallet.

R32BigSly

Cheers Iain,

Will keep my gambling to a wed & sat nite max then!!

Stu

dan0h

Thats pretty much what I heard ... what do you think of the Broquet thing though Mycroft?

__________________
planet dan0h

Dynapack Operator and Engine mapper @ Abbey's ... Responsible for Tim's BNR34 Nur, tokyodrew's BNR34, Rocket Ronnie's 3xTOTB Winning BCNR33, Harry's BCNR33, Big Marks BCNR33, Jae's BCNR33, Zenon's (Nemesis) BCNR33, Ron Kidell's (RK Tuning) BNR32, m6beg's BNR32 & m6beg's missus's GDB Subaru!, Daz's BNR32, Knight's BNR32, GBH Motorsport JZA80 ... And quite a lot of other cars people don't know about...

R32BigSly

Dan,

When reading the spec sheet of Gary's HKS R33 on his website!! i am sure it said something about him using the Broquets to help raise the octane!!

Stu