underdrive pulley or not? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 02-06-2006, 02:54 PM
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underdrive pulley or not?

should i get an u/d pulley kit? pros and cons please
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#2 (permalink) Old 02-06-2006, 03:23 PM
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get them. there really is no cons to them as long as you dont underdrive the alternator or the crank. they say its safe to underdrive the alternator but i dont think (personally i would take the chance) there are underdrive pullies for the crank as well but once again its a bad idea to do this, especially if you decide to do a lightweight flywheel in the future.


they are a decent mod to do , i will be putting mine in , in the spring

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#3 (permalink) Old 02-06-2006, 06:32 PM
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My buddy has them onhis e36. It's annoying as shit


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#4 (permalink) Old 02-06-2006, 08:26 PM
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like mark said...no alternator or crank pully's...

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#5 (permalink) Old 02-06-2006, 10:26 PM
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Quote:
Originally Posted by ///M Power
My buddy has them onhis e36. It's annoying as shit
Did he say what annoyed him? I was thinking about it too.
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#6 (permalink) Old 02-06-2006, 10:33 PM
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Steve Dinan is generally against them. He knows a lot about our cars.

http://dinancars.com/whitepapersFile.asp?ID=5



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#7 (permalink) Old 02-07-2006, 05:27 AM
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With a light flighwheel you'll always get unbalance in your crank, eventually causing your crank to break.

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#8 (permalink) Old 02-07-2006, 01:09 PM
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Good link M3UOND. That was more detailed than anything I've found but it did make me feel pretty good I'd already decided against underdriving. I'm still planning on a fan delete mod though. I would think that should free up just as much without the damage (Ohio isn't that warm anyway). http://www.understeer.com/onlinestore-engine.shtml

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#9 (permalink) Old 02-07-2006, 02:21 PM
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that link is pretty much talking about the dangers of underdriving the crank pully, i dont recall anything bad said about underdriving the other accessories.

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#10 (permalink) Old 02-09-2006, 08:46 AM
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Any underdriving is bad. Weither it's for your waterpump, dynamo etc.

I can assure you it's bad.

@Walsdru
Don't get your hopes up to high about the fan delete mod.
It's nice to do when your fan clutch is broke, but otherwise please keep the money in your pocket.
Dyno tests I've seen have proven a 1~3bhp gain, so IMO it's not word the effort.

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#11 (permalink) Old 02-09-2006, 10:11 AM
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Quote:
Originally Posted by vince318i
Any underdriving is bad. Weither it's for your waterpump, dynamo etc.

I can assure you it's bad.

@Walsdru
Don't get your hopes up to high about the fan delete mod.
It's nice to do when your fan clutch is broke, but otherwise please keep the money in your pocket.
Dyno tests I've seen have proven a 1~3bhp gain, so IMO it's not word the effort.


thats odd, can you link me to these dyno graphs? or PM me some? im curious as i will be doing it, and friends that have done this mod have seen a gain of around 4-5wrhp (like a hp gain of like 8-9hp)

as for the pullies i dunno, ive yet to read any cautions where someone had damaged the car due to it.. ive talked to bmw about pullies, they obviously dont recommend them , but they do say there is a tolerance that most do follow, because most accesories do use more power than is required,

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#12 (permalink) Old 02-10-2006, 02:13 AM
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Quote:
Originally Posted by Furious
thats odd, can you link me to these dyno graphs? or PM me some? im curious as i will be doing it, and friends that have done this mod have seen a gain of around 4-5wrhp (like a hp gain of like 8-9hp)

as for the pullies i dunno, ive yet to read any cautions where someone had damaged the car due to it.. ive talked to bmw about pullies, they obviously dont recommend them , but they do say there is a tolerance that most do follow, because most accesories do use more power than is required,
I don't have the dynocharts myself, I would like to give them to you to prove it, so you just have to believe me based on the fact that I drive a bimmer

I often visit this guy over here in Holland, he makes his living with car maintainance, mostly BMW. He also races professional with bimmers, makes racecars, build an M3 3.2L engine into a 323ti compact tuned to 350PK, so the guy really knows his deal.

I've asked him what he thinks about the commond mods like fan delete, underdrive pulley's etc. When I said if the fan delete mod really produced 6PK gain, he just laughed. He tested it himself on the Dyno, and showed 1 to 3PK gain.

Ofcourse it's something that makes your car "slower", but why spend that amount of money for so little gain... was his advise.

I've asked him because with my accident the fan got stuck between the engine and the radiator, so my clutch is fucked.
In his opinion this would be the only valid reason for me to do the fan delete mod.

If you want to spend 100~150 dollars for a fan + 99 dollars for the thermostat, waterwetter etc. just to gain 3PK, please do so.. But IMO it's not worth the money.

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#13 (permalink) Old 02-10-2006, 11:34 AM
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I guess if we all look at HP on a financial matter it should break down to approximately $40.00 per HP. I think this is a pretty close estimate on what we all spend to get the extra umph!!! out of our engines. SO, If anyone has the money to spend just do it. A little HP from the C/A a little from the Chip, a little from the exhaust a little from the fan delete and a little from the underdrive pulley WOW! if I get an average 5 HP for every addition that calculates to Ahhhhhhh?
25 HP I think that a hell of a lot of little HP.
Not I dont want to believe anyone but if there is no documentation its just heresay or someone elses opinion. I myself like to see it on paper.

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#14 (permalink) Old 02-10-2006, 11:53 AM
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im gonna be putting my car on the dyno this spring, we will see what my mods will be able to get. im hoping to see around 215-220wrhp but its along shot we will see i guess when everything is done.



as for the fan delete, i guess , much like most mods, it depends on the car, some cars react very well to mods and some do not react to them at all

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#15 (permalink) Old 02-10-2006, 01:50 PM
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That I agree with you, but in my case I'd spended the bucks on a OEM M3 GT Class II spoiler and the paint for that. Rather doing that then the risk of gaining 2PK :P

But as far as the underdrive pulleys go: Just don't

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