Wonder what a GearVendors OD would do to MPG ? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 12-19-2005, 02:43 PM
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Wonder what a GearVendors OD would do to MPG ?

Anyone know if theres room under there (2WD) for an OD unit, like Gear Vendors ??

That would knock the effect rear gear ratio down to 3.20's
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Old 12-20-2005, 03:46 AM
turboawd turboawd is offline
 
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how much would it cost to install? and then figure out how much gas you'll save. it would probably take a loooong time to get back your money from the od unit, and then some.
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Old 12-20-2005, 05:41 AM
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I've thought about this. The GV unit requires very little space whatsoever, so that would not be an issue. However, at $2,595 for the unit (plus install), that's a lot of cost to make up.

Check out here what happens to your RPM when you tack on a GV OD unit to the TBSS (effectively adding an additional .55 overdrive onto the stock .70 overdrive).

As you can see, if your average speed on the freeway is 80 mph, instead of ~2700 RPM bone stock, you will be cruising at ~2100 RPM with the GVOD. What that 600 RPM translates into as far as MPG increase is anyone's guess. I would say 2-3 MPG max.
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Old 12-20-2005, 08:25 AM
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Quote:
Originally Posted by TBSS
I've thought about this. The GV unit requires very little space whatsoever, so that would not be an issue. However, at $2,595 for the unit (plus install), that's a lot of cost to make up.

Check out here what happens to your RPM when you tack on a GV OD unit to the TBSS (effectively adding an additional .55 overdrive onto the stock .70 overdrive).

As you can see, if your average speed on the freeway is 80 mph, instead of ~2700 RPM bone stock, you will be cruising at ~2100 RPM with the GVOD. What that 600 RPM translates into as far as MPG increase is anyone's guess. I would say 2-3 MPG max.
If you can get it installed with the new drive shaft for $600 and Gas is $3.00/gal and you save 4 mpg, you still have to drive 95,000 miles to break even.
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Old 12-20-2005, 05:34 PM
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you still have to drive 95,000 miles to break even.
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Old 01-17-2006, 10:19 PM
SlvrTBSS SlvrTBSS is offline
 
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I just came across this post and realized what you guys were missing. In addition to the overdrive, the gear vendors also splits your gears. Basically giving you an overdrive in every gear. This would make it an 8 speed transmisson and the engine would be going through its peak powerband more times during acceleration and it would make it a whole lot faster.
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Old 01-17-2006, 10:49 PM
OurZoo OurZoo is offline
 
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Hmmmmmmmmm, faster is good!
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Old 01-17-2006, 11:10 PM
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Originally Posted by SlvrTBSS
I just came across this post and realized what you guys were missing. In addition to the overdrive, the gear vendors also splits your gears. Basically giving you an overdrive in every gear. This would make it an 8 speed transmisson and the engine would be going through its peak powerband more times during acceleration and it would make it a whole lot faster.
You're forgetting to take into account the time it takes to shift (a shift is not free). And also that the GV is a manual shift. You have to turn it on and off between gears....as a result, timing is critical, as you can imagine.

There are a few issues associated with integrating a GV overdrive into your modern 4-speed vehicle that are not no-brainers.
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Old 01-17-2006, 11:41 PM
SlvrTBSS SlvrTBSS is offline
 
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Originally Posted by TBSS
You're forgetting to take into account the time it takes to shift (a shift is not free). And also that the GV is a manual shift. You have to turn it on and off between gears....as a result, timing is critical, as you can imagine.

There are a few issues associated with integrating a GV overdrive into your modern 4-speed vehicle that are not no-brainers.
Yes you are correct about the timing issue. I know for a fact that you could rig the electrial switch to shift the OD on and off by itself after each shift. This is something I was looking at doing for my 67 Camaro w. a TH400. Obviously a lot simpler with the TH400, but it is possible with the 4L70...
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Old 01-18-2006, 11:37 AM
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Quote:
Originally Posted by SlvrTBSS
Yes you are correct about the timing issue. I know for a fact that you could rig the electrial switch to shift the OD on and off by itself after each shift. This is something I was looking at doing for my 67 Camaro w. a TH400. Obviously a lot simpler with the TH400, but it is possible with the 4L70...
....and you're not going to use all 8 possible gear choices as several are going to overlap
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