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Old 10-12-2010, 09:07 PM   #29
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Originally Posted by danhr View Post
ummm if I remember your dyno sheet correctly, you keep making power until 6700 or so rpm. That means you should be shifting/redlining around 7000 rpms.

So for you, the max trap speed of a 3.45 gear is 147 mph
3.73 gear is 136 mph.

A couple "special" things about your setup though

A) You are running a bias ply tire. Bias ply tires are known to "grow" on the top end of the track, since they have soft sidewalls and the higher speed. So your 28" tall tire, is going to be more like a 28.4ish tall tire by the time it crosses the traps. The faster your wheel goes, the taller it will get.

B) With most forced induction, they sometimes perform better with less gear, because the motor works better when it has more of a load on it. Well at least I know this to be true with turbochargers, I don't know about superchargers.

With that being said, I can't give an honest opinion on what should perform the best. That would be something to bring up with Ted... maybe he has a better answer than me. I know if it was me, I would be throwing a set of 3.73's in there, when you do the differential bushings. That's just me though...

Ted wants to do the 4.10's. We have a pumkin all set up with his posi-mod allready done. His theory is that the car is so heavy that it needs all the help it can get. I just think thats to much gear and all I will do is blow the tires off. And won't I be into 5th? I've seen these cars with these gears and power just over power the tires and the track. I have very limited wheel spin now so thats why I was thinking the 3.45's to try if I can find an M6 rear. Maybe 3.73's at the max. I'm still unsure so I won't pull the trigget until all my research is complete.

Thank you
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Old 10-12-2010, 09:29 PM   #30
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Ted wants to do the 4.10's. We have a pumkin all set up with his posi-mod allready done. His theory is that the car is so heavy that it needs all the help it can get. I just think thats to much gear and all I will do is blow the tires off. And won't I be into 5th? I've seen these cars with these gears and power just over power the tires and the track. I have very limited wheel spin now so thats why I was thinking the 3.45's to try if I can find an M6 rear. Maybe 3.73's at the max. I'm still unsure so I won't pull the trigget until all my research is complete.

Thank you

As a general rule the higher the power of the engine, the less gear you need. You have a much better converter than stock so it will really depend on if you can plant those slicks !! On another fairly high powered car, we put in 4.11s but later switched to 3.70 (Ford 9") and ran a faster E.T. and more MPH. There are so many variables. But it was also a lighter car. These Camaros are pretty beefy.
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Old 10-12-2010, 09:36 PM   #31
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As a general rule the higher the power of the engine, the less gear you need. You have a much better converter than stock so it will really depend on if you can plant those slicks !! On another fairly high powered car, we put in 4.11s but later switched to 3.70 (Ford 9") and ran a faster E.T. and more MPH. There are so many variables. But it was also a lighter car. These Camaros are pretty beefy.

Thanks Bruce. Thats Ted argument. The weight of the car but I'm convinced that with my setup I'll kill the tires with 4.10's. If I go with the tq multiplacation table I think the 3.45's should be gd and keep the car in 4th. 3.73's seem like I'll be shifting into 5th at the end of the pass.
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Old 10-12-2010, 09:47 PM   #32
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Thanks Bruce. Thats Ted argument. The weight of the car but I'm convinced that with my setup I'll kill the tires with 4.10's. If I go with the tq multiplacation table I think the 3.45's should be gd and keep the car in 4th. 3.73's seem like I'll be shifting into 5th at the end of the pass.

Well I have a spare rear diff if you ever want to experiment. I lent it to various people to prototype Camaro components.
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Old 10-12-2010, 09:50 PM   #33
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Not getting it.
Smaller gear ratio # the faster I can go in a lower gear, but, achieving that higher speed in a lower gear is going to take longer than with higher gear ratio.
yes
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So, the only reason why people spend big $$$ on these gears is to save themselves from shifting to a higher gear?
No. They spend the money to accelerate faster, and a consequence is having to shift more often than stock
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Hmmm...... I don't get it, everyone seems to freak out at how much qucker and more responsive the vehicle is when they change their gears to 4.10's or 3.73's, is it an illusion of the mind. What's the point?
If this is correct, shouldn't I just keep my stock gears?
It is very real. 3.73's increase torque at the wheel by about 8% over stock. 4.10's give about 19% more.
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Old 10-12-2010, 11:12 PM   #34
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Well Done Dan. Thank you for the Calculator Time. I know what you put into this.

Great write up. +hp to you.
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Old 03-05-2011, 01:59 PM   #35
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Sticky This Please

Can we get this in a Sticky??
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Old 04-18-2011, 11:45 AM   #36
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Great information!!!!!
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Old 04-27-2011, 09:15 PM   #37
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Wow that what I need.....
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Old 05-16-2011, 11:55 PM   #38
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Awesome write up man.....(now if I could just wrap my mind around how the limited slip diff works)
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Old 01-16-2012, 08:50 PM   #39
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So if I am as good as the testers are and I can turn a 13 flat with a stock SS..What kind of times could I expect to get with a gear swap to 3.73'S or 4.10's ?
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Old 01-16-2012, 09:04 PM   #40
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good question
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Old 01-20-2012, 10:07 PM   #41
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anyone?...
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Old 01-21-2012, 02:39 AM   #42
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What do you have to do to get the speedo correct when the gears are changed? Does this require a tune? Don't want to knock it out of warranty.
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