96 Corvette 4.10 Rear...Does Computer need Re-flashing???
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
Likes: 28
From: Mt. Pleasant NC
96 Corvette 4.10 Rear...Does Computer need Re-flashing???
Hello all...I am about to install the Viper 4.10 rear gears in my 96 Corvette. The thought/concern that is going through my head is this...Once installed, am I going to have to reflash the computer so the car will recognize the new gearing? In my mind, I'm thinking yes because the car as it sets with the 3.55, everything is tuned accordingly. When all that changes to the 4.10, the car is going to try to compensate and make up for the changes that have occured. So while the car air/fuel ratio was at X while the car was going 40mph and at 900rpms, now its going to be at Y at the same speed however the rpms may be at 1300 at the same speed. Anyone that has changed their gears, I'd like to hear your input on this dilemma...Thanks!
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Cliff: You need to re-program or a new tune with the new gear ratio. Your speedometer will be off.
Cliff: You need to re-program or a new tune with the new gear ratio. Your speedometer will be off.
Melting Slicks
Joined: Dec 2004
Posts: 2,687
Likes: 1
From: Manteca CA
I have 4:10 gearing and all the shop did was reprogram my spedo using the hyper tech programmer for a 96. I think that the computer senses load and rpm independent of gear raito...at least I have been running 4:10s on my LT-4 for 7 years with no downside.
Last edited by Mrs. glass car; Feb 12, 2011 at 02:01 PM. Reason: add
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
Likes: 28
From: Mt. Pleasant NC
Alright, well the thing is, I have some plans to do some other bolton mods like headers, throttle body, etc and someone else is doing the rear end. My question is, if I have the gears done first, is it going to bedriveable to take and have someone else do these other mods? Just wanna make sure the car isnt going crazy trying to figure out what is going on. If the only thing that is wrong is the speedometer, I'm alright with that as long as its temporary. And btw, can you not just change the gear on the VSS(Vehicle Speed Sensor) to match or will it still be off until re-flashed?
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
Likes: 28
From: Mt. Pleasant NC
Oh yea, what kind of programmer is that, where would you get one and how bad is it gonna hurt my feelings if I decided to buy one?
Pro
Joined: Dec 2010
Posts: 704
Likes: 1
From: Shillington PA
Simple answer, I think you are over thinking it....
If your running an automatic, then Yes, you need to adjust it for shift points, etc....
If your running stick... the only thing that will be off is your speedo, the rest of the car wont care....
If your running an automatic, then Yes, you need to adjust it for shift points, etc....
If your running stick... the only thing that will be off is your speedo, the rest of the car wont care....
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
Likes: 28
From: Mt. Pleasant NC
Have you changed gears in yours? And yes, mine is a 6 speed.
Pro
Joined: Dec 2010
Posts: 704
Likes: 1
From: Shillington PA
I have a 1996 Camaro, with a stroker 385 LT1, procharged/intercooled set up.... It is also a 6spd, and I am currently running 4.10s in the 10 bolt.
I have run the car for a few years without ever spending any of the 100's of hours of tunning on the gear change factor. However, just recently, I just took the time to adjust for the 4.10's.... and still continue the methodical process of tunning. THe car runs no dif, the a/f is no diff, nothing has changed with the exception of my speedo, is now correct.
I have run the car for a few years without ever spending any of the 100's of hours of tunning on the gear change factor. However, just recently, I just took the time to adjust for the 4.10's.... and still continue the methodical process of tunning. THe car runs no dif, the a/f is no diff, nothing has changed with the exception of my speedo, is now correct.
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Melting Slicks
Joined: Dec 2004
Posts: 2,687
Likes: 1
From: Manteca CA
If you are going to make changes to the engine air flow or compression, then you will need to get a tune to optimize your computer. Just the gear change the computer won't know, and the only thing that will be off is the spedo.
Last edited by Mrs. glass car; Feb 12, 2011 at 08:08 PM. Reason: sp
Race Director
Joined: Apr 2000
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From: Texas
, especially the first part.Yes. I had 4.10 gears and it was fine with no programming change.
Yes I can and do program PCMs as well.
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
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From: Mt. Pleasant NC
Outstanding...well, I honestly wasnt sure...I'd rather overthink it and revert to the forum first before I go and make an oopsie and wind up really screwing it up. One question...In order to get the speedo right, is that accomplished by changing the gears in the VSS or is it acheived by re-programming? And secondly(I know, I said one question), how far off is the speedo?
Pro
Joined: Dec 2010
Posts: 704
Likes: 1
From: Shillington PA
Outstanding...well, I honestly wasnt sure...I'd rather overthink it and revert to the forum first before I go and make an oopsie and wind up really screwing it up. One question...In order to get the speedo right, is that accomplished by changing the gears in the VSS or is it acheived by re-programming? And secondly(I know, I said one question), how far off is the speedo?
Also, if you are running after market wheels, or oversize tires, odds are, its already off a little bit.
When I adjusted for my gear swap, I sent my PCM to a friend in TX, I gave him my tire size, my gear ratio, and that was it....
Last edited by popo8; Feb 12, 2011 at 11:25 PM.
Thread Starter
Burning Brakes
Joined: Nov 2008
Posts: 965
Likes: 28
From: Mt. Pleasant NC
the speedo being off will depend on what gear ratio you started with.... Im not sure if its listed in this post, I didnt look (sorry).
Also, if you are running after market wheels, or oversize tires, odds are, its already off a little bit.
When I adjusted for my gear swap, I sent my PCM to a friend in TX, I gave him my tire size, my gear ratio, and that was it....
Also, if you are running after market wheels, or oversize tires, odds are, its already off a little bit.
When I adjusted for my gear swap, I sent my PCM to a friend in TX, I gave him my tire size, my gear ratio, and that was it....
Sounds good...yea, not sure if I posted it or not...3.45 ratio now and 20" wheels.
Pro
Joined: Dec 2010
Posts: 704
Likes: 1
From: Shillington PA
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
The OBD2 tuning software is about $400 dollars. LT1 Edit, Jet, and Tunercat for OBD2 are all good choices. If you plan on doing future mods then I would get the software and tune it for the gear ratio yourself. Hypertech will also work but you have to be careful with the hypertechs. Hypertechs are like doing surgery with a butcher knife. If the battery gets low during a flash it can fry your computer. Also for the money you can get real tuning software.
There is no need to change anything in your tune except for the gear ratio. I know jet and tunercat for Obd2 both have a calculator and they will make it easy to retune for tires and gears. The tuning software will allow you to adjust many things like Air Fuel ratio, Fan Speeds, Skip shift, SES lights, Idle speed, Timing etc. In my opinion the tuning software is money well spent.
There is no need to change anything in your tune except for the gear ratio. I know jet and tunercat for Obd2 both have a calculator and they will make it easy to retune for tires and gears. The tuning software will allow you to adjust many things like Air Fuel ratio, Fan Speeds, Skip shift, SES lights, Idle speed, Timing etc. In my opinion the tuning software is money well spent.
Last edited by 93VettePilot; Feb 13, 2011 at 03:30 PM.
