UNDERDRIVE (crank) PULLEY?

[Nikita]

what do you all think? i've heard about possible engine damage issues...but never any actual evidence that it has happened. do these really make any difference in performance? is unorthodox the best or will ANY brand work the same? thanks for any info....especially from those who are using this mod.

 

[SOURCE1064]

That was my second mod on my car after the air intake and I did feel a bit of difference on my car. I got the unorthodox pulley; the car felt like it has a bit more torque.

 

[Nikita]

what's involved in installing it? do you have to unmount the engine or anything? what tools are necessary? thanks

 

[SOURCE1064]

http://www.unorthodoxracing.com/install/ultras/Mitsu 90-94 2.0L Eclipse-Laser-Talon-95-99 Turbo.doc Here is the instructions. All you have to do it take off the drivers side font wheel and the plastic that cover the crank pully area. I had mine done in 98 and now a kit or just the crank pulley. When I got mine the only had the pully so I got the rest of the pulley's from dsm-preformance.com. Hope that site helps. Also just go to http://www.unorthodoxracing.com and they have a q&a section that might help answer more of your questions.

 

[Nikita]

thanks alot!

while searching for places that sell the unorthodox, i stumbled upon the mach V pulley (only $149). any opinions?

 

[L2RTSiAWD]

I have these

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A fulley-pulley set. I beileve it uses the same crank pulley machv sells since they sell DSM-Performance stuff.

 

[Nikita]

yeah i also just found some on www.dsm-performance.com for $139.

 

[SOURCE1064]

I got the rest of my pulley's from dsm-performance. They are real nice.

 

[Newlogics]

I've only installed crnak pulley (got it off ebay, $60)
Works nice. Engine seems to spool-up faster. Because I've put it on tog3ether with some other mods, I can't tell it it was pulley that made me feel the difference.

 

[Nikita]

Originally posted by Newlogics
I've only installed crnak pulley (got it off ebay, $60)
Works nice. Engine seems to spool-up faster. Because I've put it on tog3ether with some other mods, I can't tell it it was pulley that made me feel the difference.

you're the guy i need to talk to! i've seen these ebay pullies and was wondering if they were any good? quality? etc. etc.? i'll have to find the auction i've seen and see if you have the same one.....

 

[Tom Sawyer]

I'd be careful with pulleys if you have a 7-bolt. The stock piece has a harmonic dampener that takes up vibrations and shocks. I have yet to find an aftermarket one that has the dampener and that means all those vibrations are transferred directly to your crank. I dunno about you guys but I don't wanna ask for trouble with that. My buddy just C-walked and he's working on the 1Gina2G swap...major PITA. I'll keep my stock pulleys.

Tom

 

[Nikita]

Originally posted by Tom Sawyer
I'd be careful with pulleys if you have a 7-bolt. The stock piece has a harmonic dampener that takes up vibrations and shocks. I have yet to find an aftermarket one that has the dampener and that means all those vibrations are transferred directly to your crank. I dunno about you guys but I don't wanna ask for trouble with that. My buddy just C-walked and he's working on the 1Gina2G swap...major PITA. I'll keep my stock pulleys.

Tom

i've heard of this concern...but through ALL my research, have yet to see any actual complaints or damages directly linked to a UDP...

 

[doug]

I've heard about the harmonic dampening thing, but have only seen one or two stories about actual damage. However, I've seen lots more stories about the dampener on the stock pulley failing and causing the pulley to fly apart, causing probably just as much damage. Your choice.

I have an underdrive pulley from a place called Pro1. My brother-in-law got it for me since he runs a shop. I have not been able to find any other reference to them on the web, but he tells me they make pretty good stuff. It's about the same price as the dsm-performance one, I think-- maybe a few bucks less. I've had it on for about 2 months now and no problems to report-- car seems to rev a bit quicker, but like Newlogics, I also put some other stuff on at the same time.

 

[Nikita]

Newlogics-PM me about the e-bay pulley, i've been wondering about them...


concering install...am i going to have to un-mount the motor and raise/lower it to gain access to the pulley? also, am i going to need a puller to get it off or is there another way? thanks again.

 

[GRNDSM]

>I've heard about the harmonic dampening thing, but have only
>seen one or two stories about actual damage.

Doug,

That is because the damage is not always very evident. If you reduce the life of your bearings from 200k miles to 100k miles, you are not always going to point the finger to the pulley. Plus, not many people keep their cars that long anyway.

Many big racing shops, who open their motors a couple of times a year, have noticed strange, uneven bearing wear. Some stopped using them, other are still using them figuring that they will blow the engine before the bearings fails anyway.

In ether case, there is a VERY GOOD reason why it is there. You can take a calculated risk and use it, just understand what you are doing…

I am not going to get into another one these discussions. These guys say it pretty well:

http://www.dinanbmw.com/html/danger_of_power_pulleys.htm

Leon
RR

 

[Newlogics]

Originally posted by Nikita


you're the guy i need to talk to! i've seen these ebay pullies and was wondering if they were any good? quality? etc. etc.? i'll have to find the auction i've seen and see if you have the same one.....

Ebay pulley was machinned pretty nicely. The only flaw was that little hole for proper positioning. It was a bit off the position of the knob on the crank whis is supposed to go in it, so I had to elongate the hole just a bit. That was very easy and actual bolt hole matched up perfectly. Drive it ever since with no issues whatsoever.

 

[doug]

Originally posted by GRNDSM
Many big racing shops, who open their motors a couple of times a year, have noticed strange, uneven bearing wear.

By this do you mean big DSM racing shops, or shops in general?

Originally posted by GRNDSM
These guys say it pretty well:

http://www.dinanbmw.com/html/danger_of_power_pulleys.htm

I had read that article before, but thanks-- it is very informative. If I had a car with a BMW E36 engine, I might be more concerned. I really do appreciate your response, but I'm pretty hardheaded, so I'm gonna just take my chances.

 

[GRNDSM]

> By this do you mean big DSM racing shops, or shops in general?

DSM specific shops.

>I might be more concerned. I really do appreciate your response,
>but I'm pretty hardheaded, so I'm gonna just take my chances.

Well, I do not have a problem with people taking a calculated risk (we all do when we run over 20 psi of boost ). What annoys me is when companies sell those pulleys to kids who just do not know any better as completely benign mods, which they are NOT!

Leon
RR

 

[doug]

You do make good points-- hopefully those that have not researched this topic will take them to heart. But yeah, after much reading and scouring and discussing this issue with many people, I have decided to take that calculated risk.

I still have my stock pulley-- maybe one day I can do a before/after dyno pull with each to see if there really is a HP increase. But like I mentioned earlier, I may keep the new one anyway just to avoid the chance of having the two-piece stock pulley separate on me while out on the highway one day....

 

[RabidDonkeyBoy]

OEM pulleys > over priced ricey Aftermarket ones.

the only thing pulley/gear worth replacing is cam gears for adjustable cam gears. otherwise you're wasting money to shed a few ounces

 

[Nikita]

Originally posted by RabidDonkeyBoy
OEM pulleys > over priced ricey Aftermarket ones.

the only thing pulley/gear worth replacing is cam gears for adjustable cam gears. otherwise you're wasting money to shed a few ounces

ricey?? wow, i didn't know now even some engine mods were rice...isn't that kinda an oxymoron?

 

[Newlogics]

Originally posted by RabidDonkeyBoy
OEM pulleys > over priced ricey Aftermarket ones.

the only thing pulley/gear worth replacing is cam gears for adjustable cam gears. otherwise you're wasting money to shed a few ounces

Yes, you shed a few pounds, but it's not about makeing your car lighter, it's about reducing weight on your crank shaft. Aluminum pulley is about 3 times lighter then stock one, in addition to that, reduced diameter means less force is required to drive accessories like alternator and pumps. It does allow engine to rev up considerably faster. I've noticed it as soon as I installed the pulley. If anything, it's not rice !

 

[Awdboost]

buschurracing.com has crank pulleys that have the harmonic balancer. I've been thinking about getting that and AEM ones. What do you guys think.

 

[doug]

Originally posted by Awdboost
buschurracing.com has crank pulleys that have the harmonic balancer. I've been thinking about getting that and AEM ones. What do you guys think.

I think that $350 for the Buschur pulley is a lot of money. How much does it weigh?

 

[GRNDSM]

>think that $350 for the Buschur pulley is a lot of money.

I also used to think that it relatively expensive, but in now days you pay $300 for a set of UR pulleys. While BR pulley remained the same price.

>How much does it weigh?

It is NOT about saving weight! It is all about “underdrive” feature. If you want save weight, get a super light flywheel. It is much easier to shed a few pounds that way. But with lighter rotating assy will come much trickier launching…

Leon
RR