GeoffreyS Posted October 19, 2020 Report Share Posted October 19, 2020 Hello, I fill up with premium unleaded, but someone mentioned that I should also add a fuel enhancer. I just wondered if other members do this, and if so which product is recommended. Thank you Quote Link to post Share on other sites
TRTOM2498PI Posted October 19, 2020 Report Share Posted October 19, 2020 Hi There, Fuel enhancer should not really be required, if your car (& timing) are set-up correctly. I have used this one before in my tuned 6:- https://www.classic-oils.net/Penrite-Octane-Booster Cheers. Quote Link to post Share on other sites
GeoffreyS Posted October 19, 2020 Author Report Share Posted October 19, 2020 59 minutes ago, TRTOM2498PI said: Hi There, Fuel enhancer should not really be required, if your car (& timing) are set-up correctly. I have used this one before in my tuned 6:- https://www.classic-oils.net/Penrite-Octane-Booster Cheers. Thanks, Tom. My PI is set up and tuned professionally, so I was surprised when someone suggested an enhancer was needed. Quote Link to post Share on other sites
TRTOM2498PI Posted October 19, 2020 Report Share Posted October 19, 2020 (edited) Well, originally 5 star fuel was specified, but you will be fine without an additive. Cheers. Edited October 19, 2020 by TRTOM2498PI Quote Link to post Share on other sites
DRD Posted October 19, 2020 Report Share Posted October 19, 2020 1 hour ago, GeoffreyS said: Thanks, Tom. My PI is set up and tuned professionally, so I was surprised when someone suggested an enhancer was needed. It depends on what fuel they set it up with and what they set the timing to. Quote Link to post Share on other sites
aardvark Posted October 19, 2020 Report Share Posted October 19, 2020 I use this .... https://www.classic-oils.net/Valvemaster-Plus It must also stabilise the fuel as I never have problems after a winter layup. Quote Link to post Share on other sites
GeoffreyS Posted October 19, 2020 Author Report Share Posted October 19, 2020 5 hours ago, TRTOM2498PI said: Hi There, Fuel enhancer should not really be required, if your car (& timing) are set-up correctly. I have used this one before in my tuned 6:- https://www.classic-oils.net/Penrite-Octane-Booster Cheers. Thanks. I just Shell or BP (not Esso). Seems to be fine. I’ll don’t think I’ll worry about an enhancer. Quote Link to post Share on other sites
GeoffreyS Posted October 19, 2020 Author Report Share Posted October 19, 2020 4 hours ago, TRTOM2498PI said: Well, originally 5 star fuel was specified, but you will be fine without an additive. Cheers. Thanks Quote Link to post Share on other sites
GeoffreyS Posted October 19, 2020 Author Report Share Posted October 19, 2020 2 hours ago, aardvark said: I use this .... https://www.classic-oils.net/Valvemaster-Plus It must also stabilise the fuel as I never have problems after a winter layup. Thanks. It sounds a good product. I’ll look into it. I haven’t heard of that website before. Very useful. Thanks for the introduction. Quote Link to post Share on other sites
Jctr6EFI72 Posted October 19, 2020 Report Share Posted October 19, 2020 Did use octane booster on my porsche when going on track days.... better combustion for sure, exhaust white. I don t know how much it improves performance but anyway it s not bad Quote Link to post Share on other sites
GeoffreyS Posted October 20, 2020 Author Report Share Posted October 20, 2020 Thank you Quote Link to post Share on other sites
john.r.davies Posted October 20, 2020 Report Share Posted October 20, 2020 Many seem to consider that a 'fuel enhancer' (enhancing what?) is like Popeye's spinach, producing a magical performance improvement. Additives can be hepful, but you need to know what you are doing, not sprinkling fairy dust. "5 star" was 100 octane, and modern fuels like BP Ultimate or Shell V-Power are rated at 99 octane. But what does that mean? Absolutely nothing about 'performance'; it refers to the tendency of the fuel to knock, pre-ignite, in the face of increased compression ratio, and the ratio of iso-octane, a hydrocarbon that has a high resistance to knock, to heptane, another hydocarbon that is the reverse. The fuel in the pump will have a knock resistance the same as a mixture of the two in that proportion. Raising the compression does increase performance, but there is no advantage in using a higher octane fuel that one that will burn without knock in your engine. My engine was built to a CR of 10.5, really the limit for pump fuel. This became obvious one spring, when on first trip with overwintered fuel it knocked, badly. But a fill up with new fuel stopped it at once. JOhn Quote Link to post Share on other sites
GeoffreyS Posted October 21, 2020 Author Report Share Posted October 21, 2020 On 10/20/2020 at 9:55 AM, john.r.davies said: Many seem to consider that a 'fuel enhancer' (enhancing what?) is like Popeye's spinach, producing a magical performance improvement. Additives can be hepful, but you need to know what you are doing, not sprinkling fairy dust. "5 star" was 100 octane, and modern fuels like BP Ultimate or Shell V-Power are rated at 99 octane. But what does that mean? Absolutely nothing about 'performance'; it refers to the tendency of the fuel to knock, pre-ignite, in the face of increased compression ratio, and the ratio of iso-octane, a hydrocarbon that has a high resistance to knock, to heptane, another hydocarbon that is the reverse. The fuel in the pump will have a knock resistance the same as a mixture of the two in that proportion. Raising the compression does increase performance, but there is no advantage in using a higher octane fuel that one that will burn without knock in your engine. My engine was built to a CR of 10.5, really the limit for pump fuel. This became obvious one spring, when on first trip with overwintered fuel it knocked, badly. But a fill up with new fuel stopped it at once. JOhn Thank you, John Quote Link to post Share on other sites
Phil Read Posted October 21, 2020 Report Share Posted October 21, 2020 (edited) It all depends on what you call an "enhanser" Modern fuel goes off quickly and enhansers are useful in stopping it going "stale" when a car is laid up. You can also get enhansers that stabalise by converting any water in the system which could cause corrosion, this is an issue with ethanol fuels. Edited October 21, 2020 by Phil Read spelling Quote Link to post Share on other sites
john.r.davies Posted October 21, 2020 Report Share Posted October 21, 2020 Quibble, I know, but that's not an "Enhancer", that improves quality, it's a "stabilser" that keeps it the same! Quote Link to post Share on other sites
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