Best gear ratio for a Gen5 Viper?

[mjorgensen]

What would be the best rear gear ratio for your Vipers uses? If you roll race (1/2 mile or mile), drag racing, a gear for your local road course? What would you benefit from the most if you could change easily?

3.73
3.90
4.10
4.56????

Custom ratios?

[rlhay2]

You will need at least three categories: N/A, Supercharger and Turbocharger.

Most turbo cars that still see street use do not work well with high gear ratios.

Supercharged cars can be dependent upon the power level.

And N/A often depends on the intended use.

[Antonio@CalvoMotorsports]

After having my 3.07 to ride out 4th, then putting a .85 5th in it, then swapping back to a 3.55, I think for 185 mph in 5th the 3.55 is the most fun. 3.07 made the car so lazy feeling.

[V10SNAKE]

Hey Mark....I installed 3:73 in my 15 SRT Arrow PCM installed (I think I bought the gears from you?)

I noticed that when launching the car at the drag strip on drag radials less risk of bogging.

[FLATOUT]

3:55's have been great for everything from autocross to road racing to roll and 1/4 Mile for me.

[allans]

The gear that will top out my ACR @165 in 5th gear???

[FrgMstr]

Would like to see a 3.33 come back....

[SilveRT8]

For mostly street driving fun with a few track days per year, my ideal would be 3:73 gears (or even 3:90) combined with the .50 sixth gear for relaxed highway cruising.

[rlhay2]

Would like to see a 3.33 come back....

IMHO, for most cars that are above stock hp 3.33 rear gears and Gen IV trans ratios would be just about perfect.

[7TH_SIGN]

3.55

[Y'orange_UAE]

Mark, here is the speed and RPM for the stock ratios transmission with 3.55

14334


For 3.73 with stock transmission ratios

14335

Speed calculated by MPH.

Khaleefa.



What would be the best rear gear ratio for your Vipers uses? If you roll race (1/2 mile or mile), drag racing, a gear for your local road course? What would you benefit from the most if you could change easily?

3.73
3.90
4.10
4.56????

Custom ratios?

[donk_316]

Are those calculations based off normal gearing or TA trans gearing?

[ViperGeorge]

I think a 3.33 would be ideal. As it is I'm hitting the rev limiter in 4th gear with the OEM 3.55 on some tracks coming into the braking zone after a long straight. Makes no sense to upshift to 5th so I breath a little on the throttle. 3.33s would allow me to stay in the gas in 4th for most tracks.

[imagine]

3.07 for nitrous, otherwise 3.55 across the board.

[timberwolf]

Don't know ratio's but just like my C6 Z06s, 5th gear is an over driven gear and is terrible for roll racing.

[J TNT]

I'm running 3.55's , but 3.33 would be a good option with the H/C Package .

[khalid_viper]

i prefer costume transmission ration like my car
i change my tran with short ration with same rear end 3.55
it light when you drive it in the city and it aggressive when you race

if any one interesting i can post vid for my car and write my ratio

[Y'orange_UAE]

J, here's what speed and RPM with 3.33

14359


I'm running 3.55's , but 3.33 would be a good option with the V.E. / Arrow , H/C Package .

[jkviper]

J, here's what speed and RPM with 3.33

14359

Hi,

Can you post the stock gearing for a 2016 GTC?

Thanks!

[NoMorZR1]

i prefer costume transmission ration like my car
i change my tran with short ration with same rear end 3.55
it light when you drive it in the city and it aggressive when you race

if any one interesting i can post vid for my car and write my ratio

I would like to see your choice of custom ratios. Thanks.

[FrgMstr]

J, here's what speed and RPM with 3.33

14359

That should be it. I used a smaller rear tire at Texas Mile to give us an approximate 3.33 ratio. We hit the 6600 RPM rev limiter in 5th at 191mph.

[Y'orange_UAE]

That's correct FrgMstr. the calculation was done with stock rear tire size 355/30/19 and if i play with the tire profile or width the calculation will be different. Thanks for pointing this.

Khaleefa

[Y'orange_UAE]

I would appreciate if you could provide me with transmission and differential ratios.

Khaleefa


Hi,

Can you post the stock gearing for a 2016 GTC?

Thanks!

[jkviper]

I would appreciate if you could provide me with transmission and differential ratios.

Khaleefa


Thanks Khaleefa, I think these are the GTC/GTS gears where 6th gear is .5 while the TA and ACR use .63
1st 2.26
2nd 1.58
3rd 1.19
4th 1.00
5th 0.77
6th 0.50
Axle Ratio 3.55

[Y'orange_UAE]

I think they have changed the 6th gear ratio for the fuel consumption. I hate long gear ratios, you feel the car is to heavy to move.

As requested J:

14372



Thanks Khaleefa, I think these are the GTC/GTS gears where 6th gear is .5 while the TA and ACR use .63
1st 2.26
2nd 1.58
3rd 1.19
4th 1.00
5th 0.77
6th 0.50
Axle Ratio 3.55

[khalid_viper]

i will give you stock vs mine
stock mine
1st 2.26 2.66
2nd 1.58 1.78
3rd 1.19 1.30
4th 1.00 1.00
5th 0.77 0.83
6th 0.63 0.63

the things here is 1st, 2nd and 3rd gear is follow each other no lazy gear when it come to 4th you will found as stock one will reach speed 155 mph but 5th gear are short that will let you push tell the end to 193mph and also no lazy

check out my c6 zo6 and you will know what i am talking about

https://www.youtube.com/watch?v=zJxbwytbNo4

gd luck

[khalid_viper]

this one has good quality

https://www.youtube.com/watch?v=sgWmhXMT6L0

[khalid_viper]

my old zo6 it has same gear ration but that i use if in my gen 5 viper but zo6 diff is 3.42 the stock diff for zo6 i keep this diff cuz zo6 much lighter than viper

the things when you have NA car you have to play with ratio, wight and traction

[v10enomous]

Didn't they change 6th gear to be higher in the 2015's and up ? The 355's are fine but a higher 6th is needed if you do mostly street driving.

[FrgMstr]

That's correct FrgMstr. the calculation was done with stock rear tire size 355/30/19 and if i play with the tire profile or width the calculation will be different. Thanks for pointing this.

Khaleefa

I just ordered a cloth measuring tape so that I can properly measure tire circumference. The calculations we made were off by 10mph, but I think it was due to not having the tire diameter measured correctly. Then I am going to check my spread sheet against yours.

[FrgMstr]

Didn't they change 6th gear to be higher in the 2015's and up ? The 355's are fine but a higher 6th is needed if you do mostly street driving.

I actually keep up with this and this is the data I have.

0809: 2.66, 1.82, 1.30, 1.00, 0.741, 0.50 - 3.07 rear
2010: 2.66, 1.82, 1.30, 1.00, 0.796, 0.50 - 3.07 rear
13-14/15-16: 2.66, 1.58, 1.19, 1.00, 0.770, 0.63/.50 - 3.55 rear

[v10enomous]

Thanks... I thought so.

I wish my car had the higher 6th cog. I wonder what it would take to do the swap.


I actually keep up with this and this is the data I have.

0809: 2.66, 1.82, 1.30, 1.00, 0.741, 0.50 - 3.07 rear
2010: 2.66, 1.82, 1.30, 1.00, 0.796, 0.50 - 3.07 rear
13-14/15-16: 2.66, 1.58, 1.19, 1.00, 0.770, 0.63/.50 - 3.55 rear

[Jack B]

Typo for the G5 1st gear?

Which 5th gear did they run at the ring, they made a big deal about the change.


I actually keep up with this and this is the data I have.

0809: 2.66, 1.82, 1.30, 1.00, 0.741, 0.50 - 3.07 rear
2010: 2.66, 1.82, 1.30, 1.00, 0.796, 0.50 - 3.07 rear
13-14/15-16: 2.66, 1.58, 1.19, 1.00, 0.770, 0.63/.50 - 3.55 rear

[Jack B]

Your car has an independent 5th and 6th. You can change just the 6th. Call John Donoto at 248 921 4969.

He has a molded shipping carton for the 6060, he can send that to you to solve the logistics.


Thanks... I thought so.

I wish my car had the higher 6th cog. I wonder what it would take to do the swap.

[fuggles]

Which 5th gear did they run at the ring, they made a big deal about the change.

what he has there.. 2010 0.796

[Jack B]

I do not want to confuse the discussion, but, I put a 2010 trans in my G5. It has the .79 5th and the .63 6th. It was out of a salvage car. The original owner must have done the the conversion.

if anyone is interested you have to use the G5 shifter and you have to drill/tap the G4 tail housing for the G5 viscous mount.



what he has there.. 2010 0.796

[NoMorZR1]

Thank you Khalid. Those #'s look perfect.

[v10enomous]

So if you swap rear or trans gears in a GenV I guess it squashes all of dashboard data stuff ?

[Jack B]

Swapping the trans does not affect the pcm or any functions.


So if you swap rear or trans gears in a GenV I guess it squashes all of dashboard data stuff ?

[Mopar'er no car]

Don't know any better but i just like my C6 Z06s,I know they are terrible for roll racing but at my age I only really see 5th gear

Grandpa? Is that you. You joined the Viper site?

[stradman]

Sorry to resurrect this thread, but just checking after nearly 3 years, have opinions changed on best final drive? Also what about with the Heads and Cam and 9 Liter conversions. Does that affect your choice. Of course I understand there are variables here including your tire sizes but just interested to hear peoples updated thoughts. From my end I certainly think 5th gear needs changing as I do mainly track work, where there are a lot of long straights and so 5th is useless to me currently. I'm just not sure about final drive as I have been contemplating it for my upcoming 9.0 L extreme conversion. Having said that the 9.0 extreme also increases the redline to 6700rpm so that changes things a bit.

[Arizona Vipers]

Sorry to resurrect this thread, but just checking after nearly 3 years, have opinions changed on best final drive? Also what about with the Heads and Cam and 9 Liter conversions. Does that affect your choice. Of course I understand there are variables here including your tire sizes but just interested to hear peoples updated thoughts. From my end I certainly think 5th gear needs changing as I do mainly track work, where there are a lot of long straights and so 5th is useless to me currently. I'm just not sure about final drive as I have been contemplating it for my upcoming 9.0 L extreme conversion. Having said that the 9.0 extreme also increases the redline to 6700rpm so that changes things a bit.

With the 9 liter I was going to change to like 3.33 or something, but now that I'm running a 28" rear tire I dont think I'm going to change anything.
I can do 99.5mph in 2nd, 132mph in 3rd and 157mph in 4th. I'd stick to the 3.55's if i were you, I think you'll be happy with them.

[stradman]

With the 9 liter I was going to change to like 3.33 or something, but now that I'm running a 28" rear tire I dont think I'm going to change anything.
I can do 99.5mph in 2nd, 132mph in 3rd and 157mph in 4th. I'd stick to the 3.55's if i were you, I think you'll be happy with them.

Yeah AZ. I know what you mean. As I will also be running DH or Michelin slicks which will be closer to 28" I think I may leave final drive. However I still think 5th gear needs changing though.

[Arizona Vipers]

Yeah AZ. I know what you mean. As I will also be running DH or Michelin slicks which will be closer to 28" I think I may leave final drive. However I still think 5th gear needs changing though.
After COTA I think I'm leaving my 5th gear alone. With 157 in 4th i was only in 5th for a couple seconds, I doubt I will be on any faster tracks.

[stradman]

Yes I suppose it just depends on the circuit. Most of the circuits I play on involve high speed straights where I need to maximise my potential and so need a shorter 5th. So need to pull well, beyond fourth gear. Mclarens at COTA and other fast circuits on straights do 170-175. But of course they have 7 speed flappy paddles so gear ratios are different. Any footage from COTA in the 9.0?

[Stealth78]

I do not want to confuse the discussion, but, I put a 2010 trans in my G5. It has the .79 5th and the .63 6th. It was out of a salvage car. The original owner must have done the the conversion.

if anyone is interested you have to use the G5 shifter and you have to drill/tap the G4 tail housing for the G5 viscous mount.

Doug Shelby, Jack looks to have identified our question in regards to the GenIV/GenV tail housing a long time ago.

[manfreakca]

Mark, here is the speed and RPM for the stock ratios transmission with 3.55

14334


For 3.73 with stock transmission ratios

14335

Speed calculated by MPH.

Khaleefa.
218 with 3.55 so actually faster than 210 mp????

[imzoomintoo]

What would be the best rear gear ratio for your Vipers uses? If you roll race (1/2 mile or mile), drag racing, a gear for your local road course? What would you benefit from the most if you could change easily?

3.73
3.90
4.10
4.56????

Custom ratios?

I think this is a great question as it's what holding me up. Dan Cragin has suggested changing out the 3.55 in my 2013 GTS for 3.73 and say it'll wakes up a street car, however others on here have said the RPM's at HWY would be too high.......I've ask Dan however he doesn't think that would be the case.....

Thoughts?

[stradman]

I think this is a great question as it's what holding me up. Dan Cragin has suggested changing out the 3.55 in my 2013 GTS for 3.73 and say it'll wakes up a street car, however others on here have said the RPM's at HWY would be too high.......I've ask Dan however he doesn't think that would be the case.....

Thoughts?

You haven't said what you want to use the car for?

[Jack B]

I think this is a great question as it's what holding me up. Dan Cragin has suggested changing out the 3.55 in my 2013 GTS for 3.73 and say it'll wakes up a street car, however others on here have said the RPM's at HWY would be too high.......I've ask Dan however he doesn't think that would be the case.....

Thoughts?

Pretty easy, can you tolerate a 5% higher rpm. If you now have the the .63, 6th gear, it might be the straw that broke the camel's back.

[imzoomintoo]

You haven't said what you want to use the car for?

Im sorry I thought it was clear, my fault but its a street car. I have never tracked as of yet.

[imzoomintoo]

Pretty easy, can you tolerate a 5% higher rpm. If you now have the the .63, 6th gear, it might be the straw that broke the camel's back.

I'm not sure what the 6th gear is but I have heard they changed it in like 2015 or something. I guess its hard to say on the RPM not knowing anything thats why I was asking for thoughts.

[stradman]

Im sorry I thought it was clear, my fault but its a street car. I have never tracked as of yet.

Understood. But why are you therefore wanting to change gear ratios for? 1/4 mile, 1/2 mile drag races? Very high speed runs over 140 mph?
For simple street use I don't see a problem with the OEM ratios. You currently have 0.63 atm right? I guess you could go to a 0.5 ratio for 6th to drop revs and improve mpg..

[imzoomintoo]

Understood. But why are you therefore wanting to change gear ratios for? 1/4 mile, 1/2 mile drag races? Very high speed runs over 140 mph?
For simple street use I don't see a problem with the OEM ratios.

I just contacted Dan for headers and some bolt-on Preformance, It was his suggestion on changing the rear gear as he said "it'll wake up a street car" I could see doing the 1/4 1/2 drag races maybe at some point however at this point I just use the car as a street car.

[imzoomintoo]

So...for most purposes there would be little to no need for this change? Dan Cragin has suggested a few changes but I have been hesitant in changing out the 3.55 for 3.73.
I think as we spoke I had mentioned having a heads/cam upgrade and he was of the option that I could achieve a more fun factor by changing out the gears and not bothering the motor or voiding the warranty.

[gpbtt]

I just purchased a 2016. It has the 3:55 and liked mentioned prior it is quite dead from a start. I am already thinking about changing out to 3:73. You can't use 6 gear until at least 70MPH.
I know the car is designed for 200, but I never go there. I do a few track days and feel it would be a big plus with 3:73
I came from a Roush Mustang with a 100 more Hp and 3:73. I miss that pick up!
I have scheduled a track day next Saturday, I will make a decision after the Track Day.

[Jack B]

I just purchased a 2016. It has the 3:55 and liked mentioned prior it is quite dead from a start. I am already thinking about changing out to 3:73. You can't use 6 gear until at least 70MPH.
I know the car is designed for 200, but I never go there. I do a few track days and feel it would be a big plus with 3:73
I came from a Roush Mustang with a 100 more Hp and 3:73. I miss that pick up!
I have scheduled a track day next Saturday, I will make a decision after the Track Day.

You gain 5% torque advantage with the 3.73 gears. You gain 18% with a 2.66 1st gear. Then you change to a .63 6th gear and life is beautiful.

[nwa_viper]

My car had 3.91 rear in it when I bought it, used. I also have the 0.63 6th since it’s an SRT. Turning 2,300 rpm at 70 mph gets old! It started howling so I went back to the stock 3.55 rear which dropped rpms down to 2,000 at 70 mph. Oddly enough, I ran 11.6 @ 127 mph in the quarter with both ratios so I didn’t notice a difference at the drag strip.

If you have the 0.50 rear then go for it, otherwise I’d recommend sticking with the 3.55.

[sharmut]

. Oddly enough, I ran 11.6 @ 127 mph in the quarter with both ratios so I didn’t notice a difference at the drag strip.

It makes sense if you were using street tires instead of drag slicks.

[sharmut]

I have scheduled a track day next Saturday, I will make a decision after the Track Day.

By track day, are you referring to drag strip or road course?

[gpbtt]

Road Course. The only time I Dragrace is in the One Lap of America.

[Racingswh]

Road Course. The only time I Dragrace is in the One Lap of America.

I have found speed in gear is most important on a Road Course. Figure out how fast you will ever go and work backwards. For me it is around 170 mph. Then figure out what gear ratio get's you closest to that in 4th or 5th gear. I use a tire that's 27.95" tall so a 4.10 diff gear would get me where I want to be in 5th.

Problem is I do not like the 5-4 downshift. I much prefer the 4-3 for downchanges. In addition I have gotten very used to the 2-3 upshift at the track. I am not perfect but pretty good. That means I want to look at the lower numbers for the differential. A 3.23 get's me 164 in 4th and that's fast enough for the tracks I go to. In addition the gear spacing and subsequent RPM drop is less from 3-4 and it will pull slightly harder in 4th with the 3.23's than a car with 4.10's will pull in 5th. So that's what I would want on a road course. For the tire height I use and the stock transmission I would turn it into a 2-3-4 car on a roadcourse and use 3.23's. That is if they are available which I do not know?? lol!!