Know Your

We caught up with Colin Pe­abody from Per­for­mance Parts to get the low­down on fuelling mod­ules, what they do and why they ben­e­fit you…


Fuelling mod­ules – what are they and why do you need one?

FB: Can you tell us what a fuelling mod­ule is, and what it con­sists off?

CP: In terms of the Rapid Bike prod­ucts, there’s three dif­fer­ent mod­ules you can play around with. The first is the ‘Easy’, which is a ba­sic fuel in­jec­tion con­trol mod­ule that al­ters the sig­nal to the ECU to al­low it to in­crease fuelling be­yond nor­mal lim­its that you’d have on a Euro 3 or Euro 4 ma­chine. The ‘Evo­lu­tion’ is next up, which is our best seller and is the mid­dle of the road job which has a more com­plex de­sign, mod­i­fy­ing the ECU sig­nals ac­cord­ing to what’s needed for the bike and con­di­tions. It also has a self-learn­ing mode that con­stantly mon­i­tors the fuelling, which then changes the map for ev­ery lit­tle in­tri­cacy; from the tem­per­a­ture to the den­sity of the air. The rac­ing mod­ule is the third, which has all the same fea­tures as the Evo­lu­tion, while work­ing along­side things like the trac­tion con­trol and quick­shifter and all the other elec­tron­ics that help to con­trol the bike per­fectly – adapt­ing the fuelling along­side those elec­tron­ics.

FB: How do they work?

CP: They work by plug­ging into the bike, and adapt­ing the ECU’s stan­dard sig­nal to the fuel in­jec­tion side of the in­take. Some other mod­ules can’t deal with the ‘closed loop’, so will only pro­vide a map that con­trols the fuelling ‘after’ the loop – which means prob­lems at low rpm aren’t ad­dressed. Ba­si­cally the mod­ule sends a mes­sage from the brain of the bike, to ma­nip­u­late the sig­nal and make ev­ery­thing run bet­ter and smoother.

FB: What causes a road bike to have poor fuelling at low RPM?

CP: That’s re­ally a more rel­e­vant ques­tion than ever. From

Jan­uary 2017, stricter reg­u­la­tions came in for emis­sions than ever be­fore, mean­ing that man­u­fac­tur­ers are hav­ing to use far less fuel in their mix­ture, so typ­i­cally they can’t run the bikes how they want; they’re run­ning very snatchy, par­tic­u­larly on low revs due to the closed loop – which is where the ECU is con­stantly mon­i­tor­ing the ex­haust fumes which cal­cu­lates the fuel and air go­ing into the en­gine to con­stantly com­ply. By ma­nip­u­lat­ing the sig­nal from the ex­haust lambda sen­sor to the ECU, more fuel will be sent which al­lows the bike to run more freely – a sharper, crisper more re­spon­sive ma­chine. We have guys that have been rid­ing twenty years, get a new bike and find the throt­tle re­ally snatchy and hor­ri­ble – which is all thanks to Euro 4.

FB: How can you max­imise those ad­van­tages?

CP: There are no bound­aries! It’s an FIM ap­proved rac­ing prod­uct as a fuelling de­vice which shows its po­ten­tial, and there’s ab­so­lutely no cal­i­bra­tion re­stric­tions on the EVO and the Rac­ing. You can open the whole en­gine how­ever you want to go, so from a full ex­haust sys­tem and rac­ing fil­ter to go­ing ban­zai on in­ter­nal en­gine work – the mod­ule will help to max­imise ev­ery lit­tle change.

FB: How come fuelling isn’t per­fect from the fac­tory?

CP: As I said, it’s all thanks to the new Eu­ro­pean reg­u­la­tions – and it’s only go­ing to get worse which is a real shame. Let’s put it this way, if man­u­fac­tur­ers were able to fuel the bikes with­out any re­stric­tion, ev­ery modern bike would be fu­elled very dif­fer­ently – and prob­a­bly per­fectly. They sim­ply can’t get what they want and still be com­pli­ant, which is ex­actly why these lit­tle com­po­nents ex­ist.

FB: Is it more ben­e­fi­cial on a race bike?

CP: No, not at all. The ben­e­fits are eas­ily as ap­pli­ca­ble, and per­haps even more ap­pro­pri­ate on a road bike thanks to the mas­sive improve­ment in the lower rev range and at slow speeds. It’s ap­pro­pri­ate and handy for rac­ing as it will let you un­leash the en­gine’s full po­ten­tial, but we sell a lot of the Easy range on things like Africa Twins… if you have a ride on one you’ll un­der­stand why!

FB: How easy is a mod­ule to in­stall?

CP: Well the Easy is pretty damn easy – it’s lit­er­ally just a plug and play job that re­ally any­one can do with­out any drama. The Evo kit is slightly more com­plex as it uses a sub-wiring har­ness that piggy-backs onto the fuel in­jec­tion sys­tem and plugs into the ECU with things like a throt­tle sen­sor. We would rec­om­mend you have some sort of me­chan­i­cal knowl­edge to stick this in (or use a dealer) but cru­cially you do not need a dyno to set it up – so if you feel com­fort­able, you can get it on and ride away. If you want help get­ting it set up, we’ve got a grow­ing dealer net­work that can help you set it up.

FB: Can they go wrong eas­ily?

CP: No, not re­ally. Ev­ery­thing can go wrong if you try hard enough, but to be hon­est any fail­ures we’ve had have been through user er­ror, or peo­ple not read­ing the in­struc­tions prop­erly… as far as re­li­a­bil­ity goes though they’ve proven to be in­cred­i­bly durable.

FB: Do you need to ad­just them to find a per­fect set­ting?

CP: Yes and no. As they’re con­stantly com­pletely live, they adapt in live tim­ing to find you the best set­ting, so it can be as easy as you want. If you’re after that truly be­spoke set­ting though, there is the op­tion to plug it into a lap­top, and within per­mis­si­ble pa­ram­e­ters you can change your own fuelling, and even re­set it if you mess it up. It’s not too scary, as you can even set up your own base map rather than our pre­de­ter­mined one, which means you can have a per­fectly re­fined map in three or four pretty sim­ple steps. We also do a tog­gle switch which means you can change maps as well, which will help if you’re a full on en­durance racer and want some­thing smoother through a stint or even if you want to have op­tions like a wet map and a dry map.

Plug and play, baby!

Don’t be fu­el­lish, get a fuel mod­ule.

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