Flywheel Modification: To Maintain or To Reduce the Weight?

I believed all of us heard about lighten flywheel. It is an inexpensive and easy wake to wake up your Normally aspirated or Turbocharged eng...

I believed all of us heard about lighten flywheel. It is an inexpensive and easy wake to wake up your Normally aspirated or Turbocharged engine. Sorry for auto tranny owners as this is only applicable for manual tranny. The are no negative effects to lightening your stock flywheel unlike replacing it with an ultra-lightweight Aluminum flywheel. Most manufacturers make the stock flywheel very heavy because this makes the engine very smooth and enables it to retain energy at part throttle cruise and up long grades for better fuel economy.

However, an Aluminum flywheel goes completely the other direction with almost no weight. This lets the engine rev up very quickly and allows the engine to work easier due to the reduced weight spinning around on the back of the crank. This is fine as long as you are at full throttle and wide open throttle all the time like in a Road Race or Drag Race only car. As soon as you let off the gas the engine RPM drops instantly and the car slows down. In a road car this causes surging and bucking at cruise speeds and poor drive ability and clutch engagement. Thus a lot of people will tell you that lighten your flywheel will cause your car does not have enough momentum when driving uphill.

A lightened stock unit on the other hand gives you the best of both worlds. It is a compromise between the OVERLY HEAVY OEM unit and a TOO LIGHT Racing unit. You get the benefits of both with none of the bad qualities.

Turbo cars are exceptionally critical to flywheel weight. Too light a flywheel will make the car rev faster and possibly come on boost faster but that is only half the issue. When you let off the gas to shift the car will drop off of boost just as quickly causing a poor transition when you come back on the throttle.

Basically when lightened a stock unit, we will try to maintain it around 3.5-4.5kg lighter than the original yet still give the driveability needed for street use. By the way, lighten flywheel will only taken off the weight from the back side of the flywheel so the surface is still the same height and your clutch still fits and works the same.

Anyway, here is an example:
a) 10Kg of flywheel + Clutch Cover + Clutch Plate is rotating at 7000 rpm
b) 13Kg of flywheel + Clutch Cover + Clutch Plate is rotating at 7000 rpm

a will definitely has a better pickup compare to b but b will give better power at the higher rpm. At the end of the day, this is all depends on individual preference.

Technorati Tags: ,,,,,,,,


  1. Syazrul.

    great article about flywheel. I've always came across people saying they want to lighten their flywheel for better pickup, now I understand better. BTW what's the cost for lightening a flywheel? and which is better, lighten a stock flywheel or buy a lightweight flywheel? i'm drving an Iswara..

    TQ Ben

  2. Hi Syazrul,

    Thanks a lot. The cost to skim the stock flywheel is around RM30-50. If your car is for daily usage, then better don't get the lightweight flywheel as what I stated above which you can't gain momentum to drive up the hill.

  3. Hi Ben,

    May I know which flywheel suitable for Proton Saga old model


  4. Hi Ben,

    I heard that flywheel can only be skimmed once, second time need to change to new flywheel.. is that true?


  5. Hi,

    You may use Galant Supertouring.Supertouring flywheel is 8inch in diameter whereby 4G13/15 flywheel is 7.5inch in diameter. The extra size allow you to use the 1.6 clutch plate as of it has a larger friction area, better grip, improved acceleration. However, do remember to lighten the supertouring flywheel as it is heavier than 4G13/15. If not you will feel less pickup for your car.

  6. Hi Syazrul,

    Possible if the first time you skim your flywheel until too light. As of the post above explained, lighten flywheel you will lost the ability to maintain your momentum.

  7. Hi

    Do you have to balance your flywheel after lighten.

  8. Hi Feisal,

    The workshop who help you to skim your flywheel will help to balance it. So no worry about that.


  9. where can i skim? and what type of flywheel can go into naza sutera?

  10. Hi !tKeY87,

    You can get it skim at any machining shop. Do take note that it might be balance. I'm sorry that I have limited knowledge about flywheel that can fit to naza sutera.


  11. Hi ben

    Just wanna ask you how far can my persona 1.6 at can do this modification? And what do you suggest for my persona 1.6 for higher perfomance?



20 valves,1,20V,1,2ZZGE,20,360,1,4AGE,25,4D58,8,4D65,8,4D65T,8,4G13,16,4G15,15,4G16,8,4G37,8,4G61,8,4G61T,1,4G63,8,4G63T,15,4G64,10,4G91,2,4G92,20,4G93,13,4G93T,36,4G94,9,6A12,4,ABT,2,Acura,1,Acura NSX Type R,1,Adjustable Cam Pulley,6,Adjustable Suspension,6,All,444,ANCAP,1,Apexi,1,Arospeed,1,Audi,4,Audi R8,2,Audi R8 GTR,1,Audi RS6,1,Audi TT,1,BBS,1,Bentley,1,Bentley Continental GT BR-10,1,Benz,1,Bike Modification,1,BMW,4,BMW 1 Series,1,BMW 5.0L V10,1,BMW M3 GTS,1,BMW M6,1,Bolt on Turbo,2,Boost Controller,1,Boost Meter,1,Brake,1,Brake caliper,1,Bugatti,1,Bugatti Veyron,1,Cafe Racer,1,Campro Engine,12,Capristo,1,Car,1,Car Accident,1,Car Alarm,1,Car Detailing,2,Car Info,29,Car Modification,55,Car Repair,2,Car Shots,2,Car Stolen,1,Car Stuffs,32,Carbon Fiber,1,Celica Veilside 2ZZGE,29,Chevrolet,1,Concept Car,2,Crank Shaft,1,CRV L15B7,2,D.I.Y,23,Daihasu,8,Daihatsu,9,Daihatsu Ayla,1,Daihatsu Mira,19,Daihatsu Move,2,Daytime Running Light,1,DMC Tuning,1,DRL,1,Duratech,1,EDFC,2,EFJL,1,Electric cars,1,Engine bay,2,Engine valve cover,3,Enkei,1,Enkei RP01,1,Exhaust,2,Extreme Bodykit,1,Featured Cars,51,Ferrari,8,Ferrari 360,1,Ferrari 360 Challenge,1,Ferrari 458 Italia,2,Ferrari Enzo,1,Ferrari F12 Berlinetta,1,Ferrari F430,1,Ferrari F70,1,Flywheel,1,Ford Mustang,2,Formula Atlantic,1,Formula One,2,Fox Marketing,1,Fuel Pressure Regulator,2,Gallery,6,Gearbox,11,Gemballa,1,Goodwoord,1,GSR,23,Hella Flush,1,Hennessey Performance,1,Hennessey Venom GT Spyder,1,High CamShaft,3,HKS,1,Honda,26,Honda Beat,1,Honda Bike,2,Honda CB350,1,Honda Civic,10,Honda Civic EK,4,Honda Civic Si,1,Honda Civic Type R,7,Honda CRV,2,Honda CRX,1,Honda EX-5,1,Honda Integra DC2,1,Honda Integra DC5,1,Honda Jazz,1,Honda S660,1,HondaEF8,1,HWL,4,Hybrid cars,2,Hydrogen EV,1,Hyundai,1,Hyundai i-oniq,1,Indy Car,2,Inifinity,1,Inifinity Emerg-E,1,IPIN Auto,1,J's Racing,1,J32,1,Japanese,2,JBJL,3,JDM,2,K&N,1,K20A,2,Kancil L2s/L5,49,Kawashima Celica,1,KC Persona,11,Kegani Autotech,1,KemKita,1,KemKitaProton,2,Ken Block,1,Kia,1,Koenigsegg,1,Koenigsegg CCXR,1,L15B7,2,L200,4,L200s,8,L2s,8,L5,1,L502s,3,L700,2,L900,2,Lamborghini,8,Lamborghini Aventador,3,Lamborghini Cabrera,1,Lamborghini Gallardo,3,Lamborghini Urus,1,Lamborghini Veneno,1,Lexus,2,Lexus LF-LC,1,Lexus LFA,1,Lightened Crank Pulley,1,Limousine Toyota Prius,1,Lotus,4,Lotus Elise,2,Lotus Evora,1,Lotus Exige,1,LS4,1,Lumma Design,1,Lumma Design CLR 6M,1,Maintenance,6,Mazda,7,Mazda Lantis,1,Mazda MX-5,1,Mazda MX-5 GT,1,Mazda RX-7,2,Mazda RX-8,1,Mazda RX-8 SPIRIT,1,Mazda Spaceship,1,McLaren,1,McLaren P1,1,Mercedes,1,Mercedes C63 AMG Black Series,1,Mirage,2,Mirage Cyborg,5,Mitsubishi,38,Mitsubishi Colt,3,Mitsubishi FTO,1,Mitsubishi i-MiEV,1,Mitsubishi Lancer,1,Mitsubishi Lancer Evolution,8,Mitsubishi Lancer GSR,1,Mitsubishi Mirage,4,Mitsubishi Mirage Asti,1,MIVEC,11,Monkey Wrench Racing,1,Mugen,2,My Project Celica,9,My Project CRV,2,My Project Kancil,5,My Project Satria,23,News,75,NISMO,2,Nissan,14,Nissan Almera,1,Nissan GTR30,1,Nissan GTR35,4,Nissan Juke R,1,Nissan Latio,1,Nissan Skyline GT-R (KGC10),1,Nissan Skyline GT-R (KPGC110),1,nissan skyline GT-R 33,1,Nissan Skyline GTR-34,3,Oil Leak,1,Old School Car Retro,1,Others,1,Performance Parts,1,Perodua,20,Perodua Alza,3,Perodua Axia,1,Perodua Kancil,16,Perodua Kelisa,1,Perodua Kenari,1,Perodua Myvi,5,Perodua Viva,1,Pimp my ride,1,Police Car,1,Polo Sedan PQ25,6,Porsche,9,Porsche 911,2,Porsche 911 GT3 RS 4.0,2,Porsche Cayenne 958,1,Porsche Cayman,2,Porsche Gemballa Mirage,1,Prior Design,1,Project car,1,Project Cars,129,Proton,86,Proton Artiga,2,Proton Coupe Evolution 16v,1,Proton Exora,5,Proton Exora Bold,1,Proton Exora Prime,1,Proton Exora Turbo,3,Proton Gen2,2,Proton Inspira,2,Proton Iswara,2,Proton P3-21A,7,Proton Persona,13,Proton Persona R,1,Proton Preve,4,Proton Preve Hatchback,1,Proton Preve Sapphire,1,Proton Putra,2,Proton Saga,6,Proton Saga BLM,3,Proton Saga BLM FLX,1,Proton Saga BLM FLX 1.6,2,Proton Satria,37,Proton Satria Cabriolet,1,Proton Satria GTi,4,Proton Satria GTi R3,1,Proton Satria Neo,6,Proton Satria RWD,1,Proton Wira,2,Proton Wira Edition,1,R3,1,Renault,2,Renault Alpine,1,Renault Clio 4,1,Rocket Bunny,1,Rotary,2,RWB,1,S4PE,1,S4PH,1,Satria GSR,37,Scion,1,Scion FR-S,1,Sepang International Circuit,1,Shoft Shifter,1,Shoshinsha,1,Silvertop,1,Spark Plugs,5,Speed Cut,1,SpeedArt,2,Sport Rim,1,Spy Shot,3,SR Auto Group,1,Subaru,2,Super Strut,2,Supercharged,2,Team Orange,1,TEIN,3,TEQ,1,Throttle Body,2,Torque Converter,1,Toyoda,1,Toyota,60,Toyota Agya,1,Toyota Agya TRD,1,Toyota Avanza,1,Toyota Camry,1,Toyota Celica,26,Toyota Corolla,4,Toyota Corolla BZR Levin,2,Toyota FT-86,1,Toyota LFA Special,1,Toyota MR2,2,Toyota MRS,1,Toyota Prius,1,Toyota Supra,2,Toyota TE27,1,Toyota VIOS,3,Transparent Cam Pulley,2,TRD,1,TRD. Stance,1,twin pot,1,Type R,1,Underground Racing,1,Varis,1,Video,12,Volkswagen,4,Volkswagen Golf,1,Volkswagen Golf R,1,Volkswagen Jetta,1,Volkswagen Polo,1,Volvo,1,Vorsteiner,1,VR-4,1,VVTL-i,2,Wakaba,1,Works,1,Works Engineering,2,XXX-Performance,1,Yamaha Ami,1,ZZT231,7,
BEN9166: Flywheel Modification: To Maintain or To Reduce the Weight?
Flywheel Modification: To Maintain or To Reduce the Weight?
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share. STEP 2: Click the link you shared to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy