DamirGTI 342 Posted August 15, 2007 Hello ! I need some chemical help I've suck out 25l of RON95 petrol (it's free petrol !! ) from my old car which I'm not using , and i was wandering how can i raise the octane num. of this 95 petrol to 98 ? Any recommendation for good octane booster/additive which can do this rising job for me ? The problem is because - my 205 1.9 GTi which I'm driving now every day needs at least 97-98RON petrol because the engine is modified with high CR (around 11.1..) and head job etc. ... so 98RON is a must , even now running on 98 petrol I've back off ignition timing almost to the end so it's a bit retarded already (because it was pinking on standard timing now when the CR is raised ..) and I'm scared if i fill this 95 inside that i would not be able to correct (retard some more..) the timing if it start to pink on this low octane petrol ... So any thoughts boys ? Thanks ! Damir Share this post Link to post Share on other sites
Baz 421 Posted August 15, 2007 Any good company's Octane booster would do. I have used a couple. IIRC the STP one is a 250ml bottle and treats 50-60 litres, so half would do. You couldn't say how much it would increase the Researched Octane Number though. Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 (edited) I've found some interesting links regarding this subject : various brand octane boosters tests - http://www.max-boost.co.uk/max-boost/Octan...ter_comparo.htm and some more about boosters ... - http://www.max-boost.co.uk/max-boost/fuelling_advanced.htm looks like theres some DIY octane booster fluids which you can mix up by yourself , but surely this must be done deep down underground far away from people pets any source of heat or sparks and with a good asbestos outfit Cheers ! Damir Edited August 15, 2007 by DamirGTI Share this post Link to post Share on other sites
jackherer 543 Posted August 15, 2007 I would just put small amounts (3-5L) into the tank with a lot (30+L) of 98RON until it was all gone. Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 Any good company's Octane booster would do. I have used a couple. IIRC the STP one is a 250ml bottle and treats 50-60 litres, so half would do. You couldn't say how much it would increase the Researched Octane Number though. Hi ! Well in my local shops i can only find this : STP octane booster (little orange bottle) - is this the one that you are tried ? (good/best price per bottle !) PERMATEX NOS Formula street/race octane booster (a bit pricey per bottle .. +7 octane num. increase written on the bottle sounds silly to me .. ) FUCHS Silkolene PRO Boost (also good price not too expensive ..) and that's it .. Damir Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 I would just put small amounts (3-5L) into the tank with a lot (30+L) of 98RON until it was all gone. not bad either - good thinking ! Damir Share this post Link to post Share on other sites
Baz 421 Posted August 15, 2007 Hi ! Well in my local shops i can only find this : STP octane booster (little orange bottle) - is this the one that you are tried ? (good/best price per bottle !) PERMATEX NOS Formula street/race octane booster (a bit pricey per bottle .. +7 octane num. increase written on the bottle sounds silly to me .. ) FUCHS Silkolene PRO Boost (also good price not too expensive ..) and that's it .. Damir Yup, that's the one!! little orange bottle! Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 Yup, that's the one!! little orange bottle! Ok. , i will try that one ! Thanks ! Damir Share this post Link to post Share on other sites
Baz 421 Posted August 15, 2007 In that case i'd do both, add the STP stuff to 25L of the lower grade stuff you have, but still only add it to your tank a bit at a time, already mostly full of 98Ron anyway, then you should get a nice mix i would've thought. Share this post Link to post Share on other sites
hengti 2 Posted August 15, 2007 Millers produce a good one Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 In that case i'd do both, add the STP stuff to 25L of the lower grade stuff you have, but still only add it to your tank a bit at a time, already mostly full of 98Ron anyway, then you should get a nice mix i would've thought. ditto ! I've been thinking the same thing - add one (or maybe two of STP orange stuff , it's not expensive ..) bottle of octane booster to this 95RON petrol just to be safe , and then pour this mix inside in small amounts to the rest of 98RON petrol in the tank (when i will be filling with fresh 98 petrol i will add a bit of this home made stuff as we sad not more then 5l of "the stuff" ) Cheers ! Damir Share this post Link to post Share on other sites
DamirGTI 342 Posted August 15, 2007 Millers produce a good one Hello Henry ! Well in my country i can't find any Miller's products , just this STP , Permatex NOS , Fuchs octane boosters , and some other brands like Redex , Bardhall , Liqui Molly ...(but they supply regular fuel additives like petrol injection treatment , lead replacement , stop smoke , oil additives etc. , as for octane raising just these three STP , NOS and Fuchs stuff ) Kind regards ! Damir Share this post Link to post Share on other sites
VisaGTi16v 1 Posted August 16, 2007 An old (as in age) friend who rallied and hill climbed for years told me that if you use an octane booster, always use the same one in future, dont mix and match due to the different additives they use coating the inside of the engine or something Share this post Link to post Share on other sites
Anulfo 22 Posted August 16, 2007 Normally i go with Tesco 99 octane fuel.Have tried the shell V Power too,that 100 octane. Share this post Link to post Share on other sites
Grim.Badger 15 Posted August 16, 2007 Modern super unleaded in this country apparently uses ethanol (alcohol) to raise the octane rating, but again I wouldn't like to guess how much to add. Share this post Link to post Share on other sites
Stonesie 0 Posted August 17, 2007 WURTH do a good 1 too that was suposed to be comissioned by porsche....... could be true, but anyway i tried it in the VW as a stop-gap untill the rolling road could fit it in after fitting a weber carb, stopped it pinking and made it feel a bit more 'perkey' Share this post Link to post Share on other sites
