AutoTrans comes w/ rear axle, 2.77 ratio

cyberbro · 08-28-2015, 04:16 PM

AutoTrans comes w/ rear axle, 2.77 ratio
Gas mileage move? not going to be very aggressive with that.

Curr · 08-28-2015, 04:21 PM

True, but combine that with the really low ratios of the first few gears and I have no doubts the SS will get out of the hole pretty damn quick. There was a chart floating around with the gear ratios and I think the first few gears were lower than the MN6 with 3.73's or whatever it has.

ULTRAZLS1 · 08-28-2015, 04:27 PM

Quote:

Originally Posted by Curr

True, but combine that with the really low ratios of the first few gears and I have no doubts the SS will get out of the hole pretty damn quick. There was a chart floating around with the gear ratios and I think the first few gears were lower than the MN6 with 3.73's or whatever it has.

+1

I think 1st and 2nd gear are more aggressive in the a8. 3rd might go to m6. Like u said that chart was floating around here a month ago cant remember all the details.

The a8 will move out and return good mpg. The advantage of 8 speeds. No worries.

SuperSound · 08-28-2015, 04:32 PM

Quote:

Originally Posted by Curr

True, but combine that with the really low ratios of the first few gears and I have no doubts the SS will get out of the hole pretty damn quick. There was a chart floating around with the gear ratios and I think the first few gears were lower than the MN6 with 3.73's or whatever it has.

Here you go. Also here's a link showing the gears of the 8HP70 used in teh Charger/Challenger. As far as I can find there's no difference in gearing between Dodge trucks and cars. The rear ratios on the Charger/Challenger range from 3.05-.09 it appears. So they are geared a bit more aggressively but also take a slight hit to MPG. The A8 makes them just barely avoid a GG tax.
http://www.dieselhub.com/trans/torqueflite-8.html

Also note the Z51 is geared similar to the 6th gen SS.

*DGthe3* · 08-28-2015, 04:48 PM

Quote:

Originally Posted by cyberbro

AutoTrans comes w/ rear axle, 2.77 ratio
Gas mileage move? not going to be very aggressive with that.

Gearing depends on both the transmission ratio & the axle ratio. Just because its got a tall final drive doesn't mean that its going to be a dog, especially when there are 8 gears to choose from. Look at the chart in the link in the 2nd part of my post & you'll see that the 1st is still more aggressive in the auto even with its somewhat tall axle ratio.

Quote:

Originally Posted by Curr

True, but combine that with the really low ratios of the first few gears and I have no doubts the SS will get out of the hole pretty damn quick. There was a chart floating around with the gear ratios and I think the first few gears were lower than the MN6 with 3.73's or whatever it has.

Here is the post with the chart comparing the 2016 SS manual & automatic:
http://www.camaro6.com/forums/showpo...38&postcount=2

*DGthe3* · 08-28-2015, 04:52 PM

Quote:

Originally Posted by SuperSound

Here you go. Also here's a link showing the gears of the 8HP70 used in teh Charger/Challenger. As far as I can find there's no difference in gearing between Dodge trucks and cars. The rear ratios on the Charger/Challenger range from 3.05-.09 it appears. So they are geared a bit more aggressively but also take a slight hit to MPG. The A8 makes them just barely avoid a GG tax.
http://www.dieselhub.com/trans/torqueflite-8.html

Also note the Z51 is geared similar to the 6th gen SS.

I've never seen that chart before. With an automatic, the V6 gets about 20% taller gearing than the turbo4. It might get interesting to see how the fuel economy of those two compare.

SuperSound · 08-28-2015, 04:55 PM

Quote:

Originally Posted by DGthe3

I've never seen that chart before. With an automatic, the V6 gets about 20% taller gearing than the turbo4. It might get interesting to see how the fuel economy of those two compare.

Think you mean the LT cars get a 20% taller gearing. I think read they did that to make up for lower torque at low rpm. Something about "giving them an extra kick off the line".

cyberbro · 08-28-2015, 04:58 PM

Great Link, wow they made up a bit for it in that 1st & 2nd gears.
This car is going to be so much fun to hold those gears a bit.

*DGthe3* · 08-28-2015, 06:01 PM

Quote:

Originally Posted by SuperSound

Think you mean the LT cars get a 20% taller gearing. I think read they did that to make up for lower torque at low rpm. Something about "giving them an extra kick off the line".

No, I was talking about a difference in final drive ratio between the two different engines offered in the LT when equipped with an automatic. 3rd column (8L45, 2.0L & 3.6L), last row (Final drive ratio). For the 2.0L its 3.27 but the 3.6L gets 2.77. So the V6 auto is going to be getting roughly 20% taller gearing than the turbo4 automatic.

SuperSound · 08-28-2015, 06:02 PM

Quote:

Originally Posted by DGthe3

No, I was talking about a difference in final drive ratio between the two different engines offered in the LT when equipped with an automatic. 3rd column (8L45, 2.0L & 3.6L), last row (Final drive ratio). For the 2.0L its 3.27 but the 3.6L gets 2.77. So the V6 auto is going to be getting roughly 20% taller gearing than the turbo4 automatic.

Doh I've looked at thing several times and didn't notice. Odd indeed.

Sent from my SAMSUNG-SM-N900A using Tapatalk

KMPrenger · 08-28-2015, 06:48 PM

Quote:

Originally Posted by cyberbro

AutoTrans comes w/ rear axle, 2.77 ratio
Gas mileage move? not going to be very aggressive with that.

Yes...it will be plenty aggressive.

Its an 8 speed automatic...it doesn't need 3.73s.

Keep in mind the regular Vette comes with 2.42s or something like that, while the Z51, which has turned deep 11s in the 1/4 comes with nearly exact same gearing as the A8 in the SS.

It will be just fine.

GMGP5X · 08-28-2015, 06:54 PM

Quote:

Originally Posted by DGthe3

No, I was talking about a difference in final drive ratio between the two different engines offered in the LT when equipped with an automatic. 3rd column (8L45, 2.0L & 3.6L), last row (Final drive ratio). For the 2.0L its 3.27 but the 3.6L gets 2.77. So the V6 auto is going to be getting roughly 20% taller gearing than the turbo4 automatic.

I wonder what the redline and power band is on the 2.0L turbo?

*DGthe3* · 08-28-2015, 07:19 PM

Quote:

Originally Posted by GMGP5X

I wonder what the redline and power band is on the 2.0L turbo?

This is for the CTS variant of that engine, should be very similar to the one going into the Camaro.

Source

Name: 2015_LTG_CTS.jpg
Views: 6983
Size: 70.6 KB

GMGP5X · 08-28-2015, 07:23 PM

Quote:

Originally Posted by DGthe3

This is for the CTS variant of that engine, should be very similar to the one going into the Camaro.

Source

Attachment 740790

Thanks interesting!

08-28-2015, 04:16 PM	#1
cyberbro Drives: Not a Camaro at this time Join Date: Mar 2009 Location: Long Island, New York Posts: 1,056	AutoTrans comes w/ rear axle, 2.77 ratio AutoTrans comes w/ rear axle, 2.77 ratio Gas mileage move? not going to be very aggressive with that. __________________ Order Status: 2000 8/27/15 3000 9/3/15 2000 9/22/15 (Order changed) 2016 2SS With Auto, NPP, MRC, Nav, Split 5 Spoke Bright Aluminum.

08-28-2015, 04:21 PM	#2
Curr Probably doesn't like you Drives: 2022 WCT ZL1 M6 Join Date: Jun 2015 Location: Boston-ish Posts: 1,384	True, but combine that with the really low ratios of the first few gears and I have no doubts the SS will get out of the hole pretty damn quick. There was a chart floating around with the gear ratios and I think the first few gears were lower than the MN6 with 3.73's or whatever it has. __________________ I hope the 6th gen Camaro has a melodious horn trumpet. I'll tootel it at the ladies, yelling out "Hi hi." - RenegadeXR كافر ΜΟΛΩΝ ΛΑΒΕ железобетонное очко Quod gratis asseritur, gratis negatur. There is an unequal amount of good and bad in most things, the trick is to work out the ratio and act accordingly.

08-28-2015, 04:58 PM	#8
cyberbro Drives: Not a Camaro at this time Join Date: Mar 2009 Location: Long Island, New York Posts: 1,056	Great Link, wow they made up a bit for it in that 1st & 2nd gears. This car is going to be so much fun to hold those gears a bit. __________________ Order Status: 2000 8/27/15 3000 9/3/15 2000 9/22/15 (Order changed) 2016 2SS With Auto, NPP, MRC, Nav, Split 5 Spoke Bright Aluminum.

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