SVO Pete

Okay,

We hopefully can get together a group again to do a purchase of UD Pulleys in April. After testing the water at the end of the old thread, I thought a new one might be in order.

So far it seems we have at least 3 or 4 people interested. Please indicate in this thread. Someone will have to organise the group and get onto Barry about it.

Pete

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eng-fnm

I wouldn't mind a confirmation on price first.
Thanks

B-1B

I'm in!

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Gambit

I new you would be in.You wanted mine at the fpv day.

SVO Pete

Okay so far we have 2. Won't get much of a discount with 2. I am sure there would be at least a few more people wanting this upgrade, and able to purchase in April.

I haven't got a price back from Battens yet, but will put it on here when I get one. This will be for a single unit. Once we have a few more people we will see what sort of discount he can do for a bulk buy.

This has got to be the cheapest way of gaining a few KW! Need to find out how much I can get an AU Alternator pulley for now.

Will put a note in the EA forum to see if that catches anyone

Pete

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SVO Pete

Bumpity bump bump, I think we need more than 2 people to get a decent discount from BBP. C'mon guys, surely some other peoples out there are after one of these !

Else I gues it's just you and me B-1B

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edv8wagon

Something strikes me as rather odd about these underdrive pulleys, reading though the previous posts I noticed that the pulley on the alternator has to be changed to an AU type to bring the speed up again. Considering that the greatest load on the system is comming from the alternator isn't this rather counter productive.

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SVO Pete

Are you sure the greatest load is from the alternator? (I have no idea!). I wonder how much of the extra gained is removed again. If the main pulley is 25% smaller, and the alternator is marginally smaller I don't think all of the gains would be lost .... need to talk to someone who knows about these things ...

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edv8wagon

Yep, once you load an alternator up it gets very hard to turn, have a look at portable generators and the size if the donks they put on them. The dyno knows all, but all the dyno reports I have seen are post underdrive and pre alternator pulley change. The main plus from the underdrive pulley is at high revs, the minus is at idle. At idle is when you need the alternator to spin well the most, thermos etc. How much time does your car spend at either end of the rev range? mine spends 95% of it's time between 900-2500 rpm with the odd peak up to 4500 rpm. 250kw is great, but if it's at 6000 rpm what good does it do you?

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SVO Pete

Good point. May have to rethink this idea if it is no good at the low rev range.

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