-Spooky-

Taking about Alternator, Powersteering, and Crank pulley sets.

OEM Pullies 3.16ish kg
£240.00 RCM Lightweight pullies are 1.18kg a saving of 1.98ish kg
£300.00 RCM Super-lite pullies are 0.85kg a saving of 2.31ish kg

Is it worth going for the super-lite options as I’m already going to be spending £240 quid might as well do the extra £60 if they are considered to be better? Or will this be compromising too much drivability?

Has anyone heard about the super-lite crank pulley causing issues with driving the belt properly?

scoobiewrx555

A super lite pulley won't drive your belt any differently to your OEM pulley. The difference is in the rotating mass. The more weight you can shave off rotating engine parts and the parts connected to those rotating parts the more power you will make.

Lighter internal engine parts are much easier for the engine to move than heavier OEM parts.

carpboy

iTrader: (2)

Whats the difference between them in real life? Can you really tell?

scoobiewrx555

The difference in real life isn't just the weight of those rotating parts obviously but there will be a little bit of extra bhp to be had. Not much though because bhp isn't the biggest benefit to be had and is actually quite small.

The real benefit is just how much quicker your engine will rev compared to standard. This is why a much lightened flywheel makes such a difference from the OEM one to not only tickover (Idle can become lumpy) but to how much quicker it picks up.

MaDaSS

I bought the blue ones for my 03 WRX, i believe just the lightweight ones and not the super lightweight. There is no real world difference but in blue they look mint to me! LOL.
I have however had some belt slipping issues which of course i totally blamed on the new pulleys, BUT having just had my service and seen the offendingly worn and cracked belts, i suppose i will let the pulleys off with a warning!
I have had mine on for a long while now, a couple of years me thinks.

MaDaSS

Jusr bear in mind as well the write up on the RCM webby.
For the superlight set i quote the following:-
"Please note that it is not possible to run air-conditioning with this pulley arrangement."

bigarf

iTrader: (67)

£240 you can get them from cdf racing for around £80 cheaper than that.i got mine from cdf over 2 years ago now and they have been spot on.

-Spooky-

cheers guys, it was pointed out to me on the P1WOC that they are for cars with the aircon removed!

Looks like i will be going with the lightweight onces!

Mperregil

iTrader: (20)

Some one said to me that if i just fit the lighter pulleys with a normal flywheel that it would off set the balances on the crank,is this true or not?

-Spooky-

not sure, don't think so as i know a few that have fitted them with the OE 12kg (or close) fly and had no issues.

I have a 4.4kg fidanza fly however.

aXeL

I've got the four pulley lightweight set from cdf-racing being fitted in January. Moreover, they're swapping the lightweight crank wheel in the set for a super light weight underdrive pulley which is half the weight of the lightweight pulley. CDF state that they'll refund me if I can't feel the difference between that and what I have now on my WRX STI PPP

Not especially interested in any potential bhp change, it's all about throttle response for me and apparently this is the next best thing after the clutch fly wheel.... which will be next and probably my last mod except for a new ECU

Will post some before and after logging data.

CDF Racing

iTrader: (49)

Our lightweight pulleys weight 750 grams mate, no one makes them lighter

I have been making pulleys Myself for 12 years now ... Members price £154.99 delivered!


Chris

CDF Racing

iTrader: (49)

If you need any more info on them give me a call or pm, I can answer anything you need to know

aXeL

Hi Chris, you're in the process of getting some gold anodising for some pulleys to go to Subaru4You. They're for me! Rick has booked the car in. How does this work with your generous pricing offer?

CDF Racing

iTrader: (49)

Hi,

Yes they are at the anodisers but they are having problems with there gold die at the moment.... I dont stock the underdrive pulleys hence the wait,

You will have to pm me the price you are paying from rick then I'll sort the price out with him


is this for a 4 piece?
thanks

aXeL

Thank you kindly Chris. Yes, it's for the four piece set with the lightweight crank pulley changed for the under-drive version. BTW Rick isn't sure if a shorter drive belt is required, should you wish to discuss with him. He's ordered a shorter one for me as a precaution. I'll call him tomorrow and check the price (I can't recall off-hand). If the anodisers are causing you problems, feel free to scrub that part but no rush. The car is booked in beginning of Jan.

aXeL

Matt, my apologies for hi-jacking your thread - feel free to flame, curse, stick pins in dolls etc.

morebhp

do you need to change the belts when you put on lightweight pulleys

CDF Racing

iTrader: (49)

You will need a shorter belt yes,

Stock size pulleys you can use the same belts

Thanks