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Hi everyone
Who can tell me what truth?
different tuners such as protomotive,evoms,championms offer us their crankshaft pulleys.they told yes its coll better, faster car, even evoms tells that car becomes 16hp powerful than it was with stock pulley.
so who installed that part ,from what tuner and did you really noticed that the car becomes faster response or u gain some power with that pulley?
i think to buy one to try but need opinion
I recently had my motor rebuilt and we put in a GT3RSR crankshaft in it along with a GT3RS under drive pulley. Both OEM parts. Then engine revs higher and has better throttle response. I'm not sure why you would want to go with some dubious aftermarket pulleys when race proven Porsche parts are available. My car is a track car and sees a ton on high rpm use. The under drive pulley saves some wear and tear on the PS pump and removes a bit of parasitic drag to boot. Hard to a say how much power you get with the pulley. I doubt it's more than a couple of HP..
I recently had my motor rebuilt and we put in a GT3RSR crankshaft in it along with a GT3RS under drive pulley. Both OEM parts. Then engine revs higher and has better throttle response. I'm not sure why you would want to go with some dubious aftermarket pulleys when race proven Porsche parts are available. My car is a track car and sees a ton on high rpm use. The under drive pulley saves some wear and tear on the PS pump and removes a bit of parasitic drag to boot. Hard to a say how much power you get with the pulley. I doubt it's more than a couple of HP..
evoms compare stock ,their one and gt3 two types of pulleys.i think buy or tuning prt or may be from gt3.for example what i can get with that lighter and smaller pulley ?better throttle response ?it means that boost will get faster?higher rpm?
i want to choose what will be better gt3 pulley or some tun part
Last edited by artem-evo; Jun 8, 2015 at 11:00 AM.
The lighter, smaller crankshaft pulley works in 2 ways, one by reducing weight and drag on the crank. Kind of like a lightened flywheel it helps the motor rev up faster. It also enhances the performance and increases power and torque by reducing drag caused by the belt driven accessories by not having to spin them as hard and fast. It's one of the quickest, easiest, and cheapest ways to gain a little power on any vehicle.
EvoMS pulley is a nice unit. Not only does it shave quiet a bit of rotating weight it also has a larger contact area and will no shear off the crank pin which is a common problem in modified 996 and 997 turbos. i have seen some threads about the BBi one breaking so i went with the EvoMS.
Nice thread
Didn't know its actually adds hp.. Was sure you only need it when you go above 650hp to save the crank from breaking do to heavier loads on the oem pulley or something like that.. $-(
Leave it stock unless it's loose. Spend money's elsewhere where you need it
Markski
__________________ 2001 996TT3.6L and stock ECU
9.66seconds@ 147.76mph 1/4 mileclick to view 160 mph @ 9.77 seconds in 1/4 mileclick to view 50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
Is the OEM 996tt/997tt pulley a harmonic balancer? Has anyone taken apart the OEM pulley to look at its internals to verify?
With some factory boosted motors, such as the BMW N54/N55 for instance, the OEM crank pulley acts as a harmonic balancer. Replacing it with a solid one piece pulley introduces resonance/harmonics that, with mileage and load on the motor, will cause the crank to fail.
Given all the 996tt/997tt aftermarket crank pulleys out there and some of them on motors pushing much higher HP levels than what the stock motor can handle I'd have to assume the OEM crank pulley is not a harmonic balancer and that there are no issues going with a solid one piece aftermarket unit.
For your reference on what I'm talking about have a look here:
If your on a stock motor and not going past 7500 rpm no need to get any pulleys.... in my case Im past 8K and mine came loose twice... double pinning does help...
__________________ 2001 996TT3.6L and stock ECU
9.66seconds@ 147.76mph 1/4 mileclick to view 160 mph @ 9.77 seconds in 1/4 mileclick to view 50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
My pin bent and I was only revving to 7800. We just took apart my friends stock motor champion 68mm VTG car and his pin was broken and that car was only making 580 awhp on mustang Dyno revving to 7500 rpm under 50k miles. Had to replace pin and pulley. Based on that car I do not agree with Markski statement above. Contact surface area of the stock pulley is the problem.
If your on a stock motor and not going past 7500 rpm no need to get any pulleys.... in my case Im past 8K and mine came loose twice... double pinning does help...
RPM is one thing, whats on the other end of the crank is the other. I always suggest swapping to a Dampener like ATI or lightweight pulley when installing the lightweight flywheel/ clutch setup. In most cases the lightweight RS or EvoMS options are fine, big power options reduced harmonic vibration is always a plus and its' cheap insurance.
My seat-of-the-pants -dyno tells me that it revs more freely.
