posted 10-29-2001 09:42 PM            

gene

posted 11-05-2001 06:47 PM            

quote:

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Originally posted by Richard:
Thanks! I just installed the pulleys over the weekend. There are no drawbacks...just don't install them in conjunction with the LWT Flywheel.

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posted 11-06-2001 02:11 PM            

In short, what the URI pullies change is the weight and the diameter of the pullies to help the engine rev up quicker. This does not harm the engine in any manner.

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posted 11-08-2001 02:19 PM            

Please don't come off like a faulty AI program. Click on the link I provided and learn something. The FAQs on the UOR website are apparently written by people with little more than a highschool education and show a pitiful disregard for physics.

I personally have seen first hand accounts of about a dozen engines blown due to the use of an undamped overdrive crank pulley over the past four years, all from UOR. None of these are from BMWs, Hondas and Miatas primarily, but I'm new to BMWs and the enthusiast web presence is extraordinarily small by comparison. The fact remains this article on the merits of the crank nose damper is written by one of the top BMW tuners is reason enough to take heed.

Just because one can program a CNC machine does not make one an automotive engineer! - Beau

posted 11-09-2001 02:15 PM              

also richard, why will changing the pulley effect a lighter flywheel? thanks all.

posted 11-10-2001 06:35 PM            

A low boost centrifugal setup is fairly innocuous and should hardly affect engine life with similar driving habits. A centrifugal is basically a crank driven turbo which means it doesn't start to really produce much power until well up in the rev band. Its progressive nature is easier on the engine and drivetrain components, and the increasing boost past the torque peak means cylinder pressures don't really skyrocket like they would with a positive displacement blower or turbo. That jives with the high compression ratio of our engines. Also it helps counter the intertial loads caused by high rpms. Inertial loads due to high rpm running is by far the greatest stress the engine will see - typically you have to triple or quadruple the compressive loads to equal the inertial loads on a naturally aspirated engine running at 7k rpm.

With some work done for engine management (ECU reprogram/injectors or adjustable fuel pressure regulator) the engine should run like a champ as long as there's no detonation - running premium fuel is a must and perhaps backing off the throttle on very hot days if you ever hear detonation. For high boost setups I question the viability of a simple ECU reprogram - high horsepower requires precise engine management, and each engine is different due to tolerances so an aftermarket programmable ECU is a very wise idea. And then the owner should educate himself on EFI tuning to properly tune the beast.

If an engine dies prematurely due to a low boost forced induction solution its simply due to installer error or something else. I've already read accounts of these engines handling mondo horsepower quite nicely, as I understand it this supercharger _realistically_ gives maybe 70-80 horsepower, that barely tickles it considering its naturally aspirated specific output.

As far as the flywheel vs. power pulleys, there is no relation I can see. The flywheel adds some shock-loading protection from the crank to the tranny. If too light and torque transition is great the tranny may die quickly. Power pulleys certainly don't free up the kinda power under which such a problem would exist. The only case I'd be truly worried is with a large nitrous shot triggered low in the rev band equating to a tremendous amount of torque delivered virtually _all_ at once, and the little extra protection a heavier flywheel could afford would be welcome. - Beau

posted 11-23-2001 09:46 PM            

quote:

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Originally posted by Roadrunner:
hi all. this past weekend i installed the shark injector and cai from j.conforti in my mcoupe. the cai has def. improved the sound. in the higher rpm, the sound alone makes it worth it. as for the injector, i can't really tell yet. my car seems to run a little smoother and a slightly better throttle response. i was expecting 20hp increase as turnermotorsports told me. but,i'm not sure. i have'nt dyno it so i can't say for sure but it doesn't feel like it.
over all, for now, it's a bit pricey. but maybe i need to push it harder. i'll keep you guys updated.

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