M6 3.42's SUCK

[2010 2-Tone]

Does anyone know how to calculate this?
Originally Posted by 2010 2-Tone
Someone out there please help with this!
What rpm does the LS3 turn at 70 in 6th? If anyone knows how to figure what it would turn at 70 with 3.90 gears.

[logan1080]

what do you think the top speed in a ss manual would be if you put in a set of 4.10's?

[JJ#48Racing]

I don't have a 5th gen yet, but I went from 3.42's to 3.73's in my 4th gen and it made a world of difference. Gears really wake a car up. I'd like to put 3.90's in my 5th gen if it's possible.

[SSRider]

Originally Posted by 2010 2-Tone

Does anyone know how to calculate this?
Originally Posted by 2010 2-Tone
Someone out there please help with this!
What rpm does the LS3 turn at 70 in 6th? If anyone knows how to figure what it would turn at 70 with 3.90 gears.

The calculations I am giving are based on a stock tire diameter of 28.7. I really need someone to measure the actuall stock 20's for me to calculate a more accurate result. Here is my link requesting this under wheels: http://www.camaro5.com/forums/showth...366#post557366

For now this should be very close:

The M6 LS3 Camaro with the stock 3.45 gear would turn 63mph @ 1500 rpm and 83 mph @2000 rpm. You really are going to want a 4:10 gear in this car here is why. With a 4:10 the available speed at fuel cutoff (6600 rpm) is a little over 130mph in fourth gear. This is plenty of room for a power adder and mods. If more speed is needed you could still bump the rev limit to 6800 or more if needed and get more mph in the quarter mile. If you are planning on getting more than a 130mph trap speed then
Some other things to note is that the 4.10 will make 6th gear usable on the freeway. 70mph in 6th gear with a 4.10 =2000 rpm. As you can see in my sig I ran a 4.10 in my M6 LS1 Vette. I had a trap speed of 118 but I had to bump the rev limit to 6800 to achieve that. I normally ran low 12's @118 (I obviously had problems launching this car even with DR's, my launching skills have faded alittle)

Once I receive the actual OD of the stock wheels I will recalculate and post. So for now this is the best I am able to do. Do not take these numbers to the mod shop just yet we could be off some.

[SSRider]

I would also add that the stock set up on the 2010 M6 LS3 Camaro seems to have a lot of room to make simple bolt on improvements that will have this car hauling some serious ass even if it does way 3849 lbs. Hell it can damn near do the quarter mile with three gears in stock form!! Imagine getting the full benefit of fourth gear

[speedster]

Originally Posted by SSRider

The calculations I am giving are based on a stock tire diameter of 28.7.

Looks like your number is pretty much dead nuts on. Tire Rack lists a Pirelli 275/40ZR20 as 28.6" diameter on a 9.5" rim.

[The_Blur]

Originally Posted by daniel@txangl.com

I know that 3.73's would wake it up, but is this our problem? Do you guys agree with what I am saying? Do you have the M6? Do feel that the performance is less than expected?

The EPA has standards that GM must meet. They compensate by making it as fuel efficient as possible while still making the car fast on the whole. GM has actually given us a car with potential to be easily improved. Simply bolting on mods will get this car past 475 hp, and a tune can break 500. With gears and the very versatile LS-series motor, GM did everything they could to make us happy, including avoiding the gas guzzler tax. When gears are available, get some, and make sure to slap on some other mods as well.

In order to change EPA standards, I would encourage you to lobby Congress and the White House. The best alternative to punishing automakers for using traditional internal combustion engines is to provide significant incentives to invest in alternative fuels. Make sure to be polite when calling your elected officials and members of the White House. Politely ask that they consider providing benefits to companies that invest in new technologies, and make sure to point out that fines only slow the process of new investment. For example, if I'm too busy paying taxes for last year's products, I can't buy new products that might give me a tax break this year. GM is in the same place. Since GM has to spend extra on taxes and fines from the EPA and other environmental agencies, GM does not have the available resources to invest in technologies that will rid it of those fines.

[2tons of fun]

I had 4.10's in my cobra but steep gears isn't the best option when adding power by other methods... As stated earlier, if you are going put on a power adder or increase your power significantly with bolt-on's..skip the gears. I spent most of my time spinin' in 1st gear in my cobra. You will also lose the low-RPM, high-speed highway cruising these cars are built for. My Cobra turned almost 2800 rpm going 70 mph...that sucked. I also had a 98 WS6 T/A and the LS1 really came to life after a few thousand miles. My gas milage even increased....

[Scrapppy666]

went from 2.72 pegleg to 3.73 posi in the El Camino... HUGE difference in the way it responded.... I do minimal highway driving unless headed to a cruise somewhere out of the norm.... but it does suffer a bit on the highway... 3500-4k at 70mpg in 4th gear.

[logan1080]

Originally Posted by 2tons of fun

I had 4.10's in my cobra but steep gears isn't the best option when adding power by other methods... As stated earlier, if you are going put on a power adder or increase your power significantly with bolt-on's..skip the gears. I spent most of my time spinin' in 1st gear in my cobra. You will also lose the low-RPM, high-speed highway cruising these cars are built for. My Cobra turned almost 2800 rpm going 70 mph...that sucked. I also had a 98 WS6 T/A and the LS1 really came to life after a few thousand miles. My gas milage even increased....

So if we are going to be adding more power, and a 4.10 would just be a waste of 1st gear, should we just go to a 3.73 or 3.83?

[SSRider]

I agree that if you are going to do some freeway driving carefully calculate your gearing. My experience in my Vette was that I had hit the maximum point between 1/4 mile performance, highway cruising comfort and MPG's for the "Setup" on my car, I was very satisfied with the final result. BTW the rearend was my final modification and it took me two tries to get it right. The first time I guessed at a 3:73 and was not happy with the result. Then I decided to do the math. It really is a personal preference and should match well with the modifications or the intended modifications and your desired outcome of performance, MPG and drivability. for me 75 mph @2200 rpm is fine on the highway. If you want less rpm, then go 3.90 gears this is still a great option. I might also add that this assumes that those ratios will be available in the aftermarket or from GMPP for the 2010 Camaro M6.

[caverman]

I would think 3.73 or 3.9 would give you a good trade off of torquiness vs mpg. I went from a 3.36 - 3.73 when I put a TKO 5-speed in my '69. It gave me much better off the line feel but it did take a little away from my highway cruising. For me it was a good trade off because I don't drive on the highway all that much and it's still 10x better than the original 3.73 with a 1.1 ratio the muncie had (55 mph @ 2800).

I'm thinking that 3.9 with the 6th gear would make a good combo and you should definately feel the difference. If you're that concerned with the slightly lower MPG then the V6 will probably suit you better anyway.

[SSRider]

Originally Posted by 2tons of fun

I had 4.10's in my cobra but steep gears isn't the best option when adding power by other methods... As stated earlier, if you are going put on a power adder or increase your power significantly with bolt-on's..skip the gears. I spent most of my time spinin' in 1st gear in my cobra. You will also lose the low-RPM, high-speed highway cruising these cars are built for. My Cobra turned almost 2800 rpm going 70 mph...that sucked. I also had a 98 WS6 T/A and the LS1 really came to life after a few thousand miles. My gas milage even increased....

I hear what you are saying and I am not disagreeing but I would like to point out that the transmission gearing could be way different in a Cobra to that of a 2010 Camaro M6. For example the SS A6 has a very short first gear (4.03) vs. the M6 (3.01). So if you were to install a 4.10 in the SS A6 then yes you would blow right through first gear. So to compare the Cobra first gear to the M6 first gear I would need the ratio and the
wheel dimension of the Cobra in order for an accurate comparison. A 4.10 gear in an M6 SS (according to my calcs) will give you 44 mph @6600 rpm. I would not consider that to be blowing through first gear or making first gear unusable. Would most on this forum agree with that? I think for bolt on performance I would go 4.10. If I was adding a SC
or Turbo then I would have to carefully consider raising the fuel cut-off up to 7000 rpm, a 3.90 or 3.73 and/or a custom tranny with different gears. Lots of brain work here

[kdoske]

isn't the camaro automatic 4.0? probably isn't really noticed because of the torque limiter though...