4.777 Diff
05-20-2009, 03:14 PM
#26
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Hey Joe, no offence meant I didnt know who installed it! It just looked like a nic that opened up under the heat that goes through the lightweight stuff. I know you do good work and thats why I said from an untrained eye. I bet if you try and get warranty from the manufacturor though that would be the answer you would get lol. Like I have always said and maintained post after post, the lightweight stuff is great in a race car that never goes below 7,000rpm, but like other stuff it doesnt work well on the street. Some of the race car guys that run small tight tracks are re-thinking their flywheel choices because of the lack of low end light weight produces.
05-20-2009, 03:25 PM
#27
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Won't get any kind of response from manufacturer until they receive the defective part.
On a side note, was speaking to Racing Beat about their flywheel, which is 3 pounds heavier than the SPEC flywheel, and he was reinforcing what you were saying Al about application. They said, that if you have a dragster (quarter mile car), you would want a heavier flywheel to better launch the vehicle. Wheres, a race car which relies on high revs would benefit from a light flywheel.
The ironic thing is we need BOTH
We need more launching power, which the OEM flywheel provides and yet, as a high revving engine, the lightweight flywheel also has merits.
I can't wait to see how quickly my car launches with OEM flywheel and 4.777 diff
On a side note, was speaking to Racing Beat about their flywheel, which is 3 pounds heavier than the SPEC flywheel, and he was reinforcing what you were saying Al about application. They said, that if you have a dragster (quarter mile car), you would want a heavier flywheel to better launch the vehicle. Wheres, a race car which relies on high revs would benefit from a light flywheel.
The ironic thing is we need BOTH
We need more launching power, which the OEM flywheel provides and yet, as a high revving engine, the lightweight flywheel also has merits. I can't wait to see how quickly my car launches with OEM flywheel and 4.777 diff
05-20-2009, 03:32 PM
#29
Rebuilds anyone?
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No offence taken Al, the internet sucks and I re-read my post, sorta does seem like I took offence lol.
Its all good though. Moral of the story is....Spec made a defective part.
Its all good though. Moral of the story is....Spec made a defective part.
Last edited by R.P.M.; 05-20-2009 at 07:09 PM.
05-20-2009, 03:34 PM
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05-21-2009, 01:46 AM
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I am going to use the OEM 4.777 but won't buy the whole back, only the gears themselves, and have them installed.
On a separate note, I found this article on flywheels interesting
On a separate note, I found this article on flywheels interesting
05-21-2009, 01:16 PM
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I am going to use the OEM 4.777 but won't buy the whole back, only the gears themselves, and have them installed.
On a separate note, I found this article on flywheels interesting
On a separate note, I found this article on flywheels interesting
Only point they missed in the article is the fact that the light-flywheel car booged when the clutch was dropped and almost stalled lol.
05-24-2009, 04:25 PM
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Ray, you've peaked my curiosity about the Racing Beat Flywheel. Sent them an email asking for confirmation on the weight of their flywheel and counterweight. Will report back on what I find out.
05-24-2009, 07:37 PM
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^ that would make most sense but they probably aren't adding bolt weight. Sounds like it is very similar in weight to your offering.
They mention both absolute weight reduction and moment of inertia in their literature.
They mention both absolute weight reduction and moment of inertia in their literature.
05-25-2009, 12:34 AM
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/\ Still thinking to get a flywheel from you... Charles
But damn, only if there wasn't so much labour involved with the clutch and transmission I would've gotten it by now.
But damn, only if there wasn't so much labour involved with the clutch and transmission I would've gotten it by now.
05-25-2009, 09:40 AM
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This article has it exactly correct and I sum it all up by saying that "flywheels are for people, not engines."
As such, light flywheels (especially when used in conjunction with light pressure plates) require a different finesse between the gas and clutch pedals. For example, I have no problem driving this exact flywheel/pressure plate combo with every bit of smoothness as I do the factory flywheel and pressure plate.
The reason the engine "bogs" when people are not that familiar with these set-ups is simply because they have to concentrate a bit more on the coordination between their two feet. Once they concentrate and develop a new methodology, they have no issues with driveability. OEMs select the flywheel weights they do as a result of considering the entire demographic that is likely to be driving the car. Higher 'wheel weights allow for more driver error before driveability suffers. Conversely, lower rotating masses require more driving precision.
In the future, I will be issuing guidance manuals for those who purchase my flywheels and clutches.
BTW, if Racing Beat's flywheel is ACTUALLY 12 lbs. (as their website indicates) and the necessary counterweight of 3.8 lbs. is added to that, plus the weight of the bolts, we are looking at a mere reduction of about 1 lb. from the rotating mass. Not much for the $505 plus shipping they are asking for it. If you look at their picture, their flywheel looks exactly like the Fidanza/SPEC/BHR units.
As for drag-racing launches; why do you suppose that NHRA/IHRA Pro Stock class vehicles use 6.0 lb. flywheels?
As such, light flywheels (especially when used in conjunction with light pressure plates) require a different finesse between the gas and clutch pedals. For example, I have no problem driving this exact flywheel/pressure plate combo with every bit of smoothness as I do the factory flywheel and pressure plate.
The reason the engine "bogs" when people are not that familiar with these set-ups is simply because they have to concentrate a bit more on the coordination between their two feet. Once they concentrate and develop a new methodology, they have no issues with driveability. OEMs select the flywheel weights they do as a result of considering the entire demographic that is likely to be driving the car. Higher 'wheel weights allow for more driver error before driveability suffers. Conversely, lower rotating masses require more driving precision.
In the future, I will be issuing guidance manuals for those who purchase my flywheels and clutches.
BTW, if Racing Beat's flywheel is ACTUALLY 12 lbs. (as their website indicates) and the necessary counterweight of 3.8 lbs. is added to that, plus the weight of the bolts, we are looking at a mere reduction of about 1 lb. from the rotating mass. Not much for the $505 plus shipping they are asking for it. If you look at their picture, their flywheel looks exactly like the Fidanza/SPEC/BHR units.
As for drag-racing launches; why do you suppose that NHRA/IHRA Pro Stock class vehicles use 6.0 lb. flywheels?
Also you better recheck your numbers about Racing Beats flywheels weights. The stock flywheel is 18lbs and the RB WITH counter weight is 12 lbs. Pretty signiciant if you ask me.
Last edited by 01Racing; 05-25-2009 at 09:43 AM.
05-25-2009, 11:53 AM
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I like yourself are very particular about what aftermarket parts we sell out of our dealership. I find that most people read way too much on the internet and believe everything they read. Having 30 years of experience modifing cars for myself and customers I have learned the hard way that 70% of what you modify from the OEM may result in the ebenfits that the aftermarket supplier claims, however(your favorite word again) the downsides after a while out weigh the benefits. Just to give you an idea, we had a discussion about supercharging small displacement engines which the supplier of the supercharges rave about. The real world is slightly different. When you take an engine that produces little or no torque and then drag 25% or better of its bottom end power, the overall result isnt that great. What the supplier didnt tell the customer is the supercharger doesnt change the powerband of the engine. When we supercharge 5.0L Mustangs, we can actually use a bottom end power loss to get traction. That is just one of the small examples of the many that are out there. I stil maintain that a light weight flywheel on and engine that has little or no torque down low is not worth the driveabilty issues for the gains.
