Author Topic: 58mm pulley  (Read 6000 times)

Offline GAF2

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58mm pulley
« on: August 03, 2011, 08:15:14 pm »
Hi guys,

i managed to get my hands on a 58mm toothed pulley a while back and today my nose finally got the better off me and i fitted it.  Now i know that in a perfect world i would need a new chip/map to run the smaller and i am goin to contact PPP for a custom chip but before i get that will it be dangerous to run it as is?

The chip i have is set up for my 65mm pulley and it has always ran rich which i read is common with off the shelf chips so with the smaller pulley = more air is it possible it could be ok or is that wishful thinking and not as easy as that?

I havent driven the car just idle and it seem to run fine and when you rev it... ha ha what a noise.

cheers Grant

Offline PeteG40

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Re: 58mm pulley
« Reply #1 on: August 03, 2011, 11:10:15 pm »
only issue is that at 7,000 engine rpm, the charger bearings are at their max safe rpm with a 65mm pulley, so watch yr rpm!!!

I know one person who revved a freshly serviced charger with a 60mm pulley 3x to 7.5k and then the top charger bearings seized and it grenaded!!!


Offline Justin14100

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Re: 58mm pulley
« Reply #2 on: August 03, 2011, 11:20:39 pm »
Sounds fun! any chance you could count the teeth on the pulley for me? I'm toying with going to the next size down my my current pulley and would like to know some drive ratio's.

Offline GAF2

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Re: 58mm pulley
« Reply #3 on: August 04, 2011, 03:38:32 pm »
cheers for the warning pete, is there uprated bearings available do you know?

 Am shite at maths any idea what the max rpm would be now? suppose just need to be sensible see how it goes. What do we think service intervals would drop to with a 58mm pulley, every 5000 miles?

Dont think am gonna run it all the time will prob just put it on every now and then or get my spare charger ported and rebuilt and put it on that. Its sounds sweet tho my 65mm pulley never made any noise at all me being a big kid i love the whine.ha ha.

Justin an not gonna be near it today but will count them for you tommorow or saturday. You thinking about making a 60mm or something?

cheers Grant.

Offline Justin14100

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Re: 58mm pulley
« Reply #4 on: August 04, 2011, 04:12:01 pm »
cheers for the warning pete, is there uprated bearings available do you know?

 Am shite at maths any idea what the max rpm would be now? suppose just need to be sensible see how it goes. What do we think service intervals would drop to with a 58mm pulley, every 5000 miles?

Dont think am gonna run it all the time will prob just put it on every now and then or get my spare charger ported and rebuilt and put it on that. Its sounds sweet tho my 65mm pulley never made any noise at all me being a big kid i love the whine.ha ha.

Justin an not gonna be near it today but will count them for you tommorow or saturday. You thinking about making a 60mm or something?

cheers Grant.
Well I have some custom made steel ones that i machined myself so know the drive ratios, also know the ratios of the PSD ones ( they are a different amount of teeth but the same drive ratio) so at the moment I'm on a 2x crank speed pulley (1.6x is standard) next one up is 2.18x just wanted to know what PSD would call a 58mm drive pulley - so i can see what 2.18x would be comparatively.

Hopefully it would be around 60/62mm so its not massively brutal on the charger like a 58 could be, chances are its probe the same as your 58 though.
« Last Edit: August 04, 2011, 04:14:40 pm by Justin14100 »

Offline GAF2

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Re: 58mm pulley
« Reply #5 on: August 04, 2011, 04:15:48 pm »
Straight over my head mate. ;D. Will get them counted tomorrow.

Offline PeteG40

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Re: 58mm pulley
« Reply #6 on: August 04, 2011, 06:49:25 pm »
you can get top bearings which are higher speed, but the seals on them arent as good (they are shields) so shit can get in and grease come out!

Offline Justin14100

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Re: 58mm pulley
« Reply #7 on: August 04, 2011, 07:21:06 pm »
you can get top bearings which are higher speed, but the seals on them arent as good (they are shields) so shit can get in and grease come out!
How long will they last? Can you get some? they are ZZ code are they not? quite tempted to try it out but would have to make a stand alone oil supply so i don't feel guilty for the G-Lader

Offline PeteG40

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Re: 58mm pulley
« Reply #8 on: August 04, 2011, 07:54:33 pm »
they are zz's and are same price as normal shielded ones... these are the only bearing in the lader that is not oil fed, just grease lubed.  Not sure how long they'd last tbh...

these at bartek are supposedly higher rev range - http://www.bar-tek-tuning.com/lshop,showdetail,28272,en,1312484027-28327,g-lader.1132925576,1100007,9,Tshowrub--g-lader.1132925576,.htm

probably means the seals are viton so absorb heat better. (thats all difference between rubber shielded and metal ones will be i think)

Offline Richg40

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Re: 58mm pulley
« Reply #9 on: August 04, 2011, 07:58:12 pm »
 i used them and never had problems. Just pack em with a little grease between the two side shaft bearings, obviously dont fill the gap with grease though.

Oh, i wasn't using a 58mm (deep pockets pulley) nor would i have even though the bearing supposedly could take it.
« Last Edit: August 04, 2011, 08:03:06 pm by Richg40 »

Offline GAF2

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Re: 58mm pulley
« Reply #10 on: August 04, 2011, 08:05:10 pm »
cheers for that pete, just getting a stand alone oil supply sorted out. Might see about getting my other charger rebuilt with these bearings and see how it lasts with the 58mm pulley.

cheers

Offline Justin14100

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Re: 58mm pulley
« Reply #11 on: August 06, 2011, 09:41:08 am »
not sure what would be better, the bar-tek ones or some ZZ's if the ZZ's shit grease everywhere they might not last long.

Offline PeteG40

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Re: 58mm pulley
« Reply #12 on: August 06, 2011, 10:07:51 am »
i'd sooner use  the barteks in my opinion, be interested to know their code to see if can be sourced in uk

Offline Justin14100

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Re: 58mm pulley
« Reply #13 on: August 06, 2011, 04:29:48 pm »
i'd sooner use  the barteks in my opinion, be interested to know their code to see if can be sourced in uk
http://ahrinternational.com/SKF_nomenclature.shtml
according to this the SKF code for bearings with a viton seal is '2rs2' so i suppose the bearing you are looking for is a SKF 6003.2RS2

Offline PeteG40

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Re: 58mm pulley
« Reply #14 on: August 06, 2011, 04:32:35 pm »
now you need to find specs of bearing  for differences in rpm, if there is one!