Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/127541
BUTTON Althoug h seemingly the firs t cho ice to receive the ABS/TCS system, the touri ng series of Gold Wing models already has li nked brakes, and the ABSITCS wo uld add more weig ht to an a lready heavy machine. Arid H onda feels that addin g $2000 to the price of a lo w-cost model would ma ke it unsaleable. Honda feels th at riders who purchase STllOOs tend to be more pe rforman ce o rie nted, a nd tend to ride on mor e-varied road conditions than a Gold Win g ri der migh t. The STI I000 ABSITCS is scheduled to arrive at. deal er showrooms in ear ly May, and H on da unveiled the comp lete system with a technical bri efin g and demonstrati on ride at its provin g center, which is loca ted in Ca lifornia 's Moj av e Desert, north ea st o f L os Ang eles. . Both the Honda and BMW ABS system s use simi lar designs cons isting of three primary co m po ne n ts: a n electro n ic con tro l unit (ECU), a pair of hydraul ic pressure modulat or s, and speed senso rs at each wheel. With in Honda 's ECU is a 16-bit centra l processi ng unit that converts .signa ls from the two whee l sensors into speed data once every 3/ 1000ths of a second . The ECU then uses the data to ca lc u la te th e spec ific ra tes of acceleratio n , deceleration and tire sli p ratio. When braking, the ECU determin es the need for ABS control and if necessary, relays hydraulic pressure control signals to the modula tor (s). Each modula to r is he r me tica lly sea led and contains two high-speed soleno id valves. Honda's modulator s have three operation modes, unlike th e BMW system which has two. When the brakes are app lied hard, the ECU will detect th e wh eel' s tenden cy tow ards locking and rapidl y reduce hydraulic pressure to the calipe rs by simu ltaneously closi ng the inlet valve, ope n ing the o u tlet valve, sh ifting an expander p iston toward a backup piston and closing th e cutoff valve. After a predetermined decompressio n inte rva l, the ou tlet valve closes and hydrau lic pr essure is held, allo wing wh eel speed to recover. Once th e ECU detects wheel speed recovery, i t res tores hydra u lic pressure at the calipers by open ing the in let valve and closi ng the out let valve. ' Internal system pressure shifts the expander piston to the cutoff valve. The decrease/h old/in crea se sequen ce permits rapid ada pta tio n to cha n ges in whe el rota tio n whil e accuratel y controlling hydraulic pressure to th e brake ca li pe rs, and is designed to closely foll ow ideal braki ng p ressure: In co mpar iso n, th e T wo valves in the ABS modulators regulate h ydraulic p ressure at the brake calipe rs. at Charlotte SX Wiseco congratulatesDGY Racing's Jimmy Button on capturing Round 8 of the 125cc AMA Camel Supercross Series. Button predic ted ' his Wiseco / ProTru equipped YZ125 was up to the test and proved it with a 2nd place finish in the qualifying heat and a convincing win in the 125 Main. Button's win places him a solid third in 125 Eastern Regional Point Standings. .. GEeD I._~'" 2-Cycle MX / ATV Piston Design Available for HONDA - KAWASAKI· SUZUKI· YAMAHA Anti-detonation grooves Dynamometer tests Indicate: Wiseco 's computerized mac hined antl-detonatlon grooves create a turbu lent flow of combustible gases sealing the ring to the cylinder wall virtually elimin ating ring blowby wh ile providing maximum power and performance. . Computerized high -speed diamond tooled tu rning centers hold exact tolerance s with no size variations . Forged from hi-silicon aluminum alloy for superior strength and reliability , the reinforced waffle dome design offers add itiona l dome strength with improved heat transfer. W1seco ProTru p istons are supplied with tapered wa ll wrist p ins, rings and ci rcl lps. Can for your FREEl Motorcycle/ATV piston c ata log today CB-92 I WISECO PISTON INC. 7201 Industrial Pa rk Blvd . Mentor. OH 44060 (216) 951-6600 In Canada: (519)-537-6281 -------------------------------------------------------, Attention . - .Subscribers, - Normal Mode 1 . Fo r FASTEST service attach o ld ma iling label in space be low. If m ai ling label is not available . print y ou r nam e and ad d ress i n th is box. Ple ase all ow 3 weeks fo r c hange to take effect . iston iston 2 . Pr int your NEW address he re . NAM E •• Outlet valve lnlet valve L ~ ADDR ESS '_ _--' _ STATE C ITY _ ZIP _ 3. Mail t o: Circulation Department CYCLE NEWS, P.O. Bo x 49 8, Long Beach, CA 90801-G498 ~ J 17