Jump to content
SAU Community

Recommended Posts

anyone know anything about how much power is lost with defference between wheels? 19"275 to 16"205?

Think of it this way - if you were riding a bicycle which would be easier for you to turn? I can't quantify it exactly but the bigger and heavier, the worst they are. Of course the trade off is a larger contact pad means greater traction so a wheel size that put more rubber on the road (wider) will give you more traction but a bigger (e.g. 22 vs 17) is a big negative.

  • Replies 368
  • Created
  • Last Reply

Top Posters In This Topic

the bigger wheels you have the more power you get. same with chrome. Thats why people go bigger and bigger wheels thse days....not becaues they look cool, only the cool people know they add at least 30kw for every size up. who needs bigger turbos when you can get the same power with 2" larger wheels

Thanks for your lovely comments.....i was asking a serious question....how much power is lost with big wheels as power is lost from the engine to the gearbox, diff etc....my bro reckons it will have a fairly significant effect and suggests that I change my wheels before going to get a bigger figure...

i have to change my rims for the skid pan day next weekend eventually, and at the drags i have light stock rims, thought id match power. also it aint cheating, maximising....why spend money on mods when you couldnt care less to change rims to maximise power output.

Mainly i was curious at how much power would be eaten up.....you lose quite alot from the engine to wheels and was interested where it was lost the most and where i could save it....

Smaller rims gets more power because you are effectively shortening the gearing. This is only so if the overall tyre diameter reduces as well. It's got nothing to do with weight.

To achieve a similar effect you could dyno it in 3rd gear instead of 4th.

i have to change my rims for the skid pan day next weekend eventually, and at the drags i have light stock rims, thought id match power. also it aint cheating, maximising....why spend money on mods when you couldnt care less to change rims to maximise power output.

Mainly i was curious at how much power would be eaten up.....you lose quite alot from the engine to wheels and was interested where it was lost the most and where i could save it....

hehehe.. yeah valid point!! i'll be changing my rims for drags.. will probably just get street semis for track! can't be bothered going to that extent!! :) i like just turning up, and driving straight out! :D

Small overall diameter tyres shorten your effective diff ratio which increases the tractive effort (torque..well, sort of), measured by the chassis dyno. Since HP is calculated from the 'torque' measured, power increases.

Nismo God, you have it backwards mate.

dont want to state the obviouse

but where is the farken r31 award

if your not going to have one then can i just get a prize john and call it the fatz rocs prize!

ya poofs!

I was the only R31 there last time, no competition :) I didn't even have to get on the dyno to win (well, i did, but, you know)

umm was I the only person who spotted lingeringsoul was being damn funny.

Dyno days always seem to bring out everyone's serious/competitive side :)

silly ain't it!

and lol @ 2rismo. "VTEC y0"

I won't be running, I can't afford it. Well, if anyone wants to pay me, I'll actually run on the dyno rollers and see if I can make 1kW.

errmm... where would one put the temp sensor then?

Hi all.

At the dyno day, will they just be running your car on the dyno to see how much it's got at the time or will they tinker with a few of your mod's to see if they can get more out of your engine? :P:)

Hey Joeyz, they won't necesarily tinker with the car. There's generally no time.

Unless it's Ben that's running the cars up, and your name is Mona, and you say, "I don't care what it gets just make sure I beat wilch!"

Then you make close to 500rwkW with a tiny turbo.

lol

I bet my R31 makes more powah and tourqe than you James!

AND will be quicker than you!!!

Oh shit, now the thread is getting more competitive!! hahahahaha

:)

agree with Jess - Restepa ftw!




  • Similar Content

  • Latest Posts

    • Wife wanted basket things in the wardrobe in our temporary house. Thought about ripping our the wardrobe and fitting the entire IKEA set, but it's a temporary house and we want to move in a few years. So IKEA advertises this as a 50cm unit, however the actually basket and rails measure 46cm wide. Only issue was depth, IKEA stuff is quite deep, where as the builder special junk is super shallow at less than 40cm. Send it, chopped the rails, then offset the mounting holes, job done, happy wife, less shit scattered all over the bedroom. Did the same to the other side too. Also drove the Skyline shit box today, dropped off oil at Supercheap Auto. I didn't realise they only now take max 2x bottles per visit. I visited 2x Supercheap Autos.  
    • I've seen similar actually in my situation. You never know what tables are attempted to be used when the car thinks it's -99C or +200C. The fail state is not usually that extreme but you know what I mean - it was in my case though! This is where being able to read all the sensors is useful cause you see this stuff really quickly.
    • The above is very important. However as long as you keep timing relatively low, it's plausible to make your own knock ears and plausible to learn to tune with a modern ECU that can do wideband O2 correction like a boost controller. I mean if you only have one viable road to even drive the car on, learning to tinker to this level may be worth doing given you can't do much else with the car...?
    • I find the fact that the rear plate has to be bent inwards at the rear not so bad: but the front is just awful: It's like come on. (these are my very old, now retired/turned in plates) TBH it is a lot of money to fix a minor issue, the fact I said "I'll never really spend the money on doing this" is why people ended up buying them as a gift for a 'car guy' who can be hard to shop for.. for car guy things.
    • I just bent the ends of my premo plates. It even went through Regency like that after the engine conversion and the inspector (a great bloke!) just squinted his eyes and said "I didn't see that". Plates, and how they look, are just something that have zero importance to me.
×
×
  • Create New...