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  Topic Review (Newest First)
04-12-2019 10:56 AM
kenru1 What are any "downsides" to using an Autoflash and do you have any in stock? (2013 Passion)



Thanks



Quote:
Originally Posted by SmartMadness View Post
So there are a few things we need to go over here.

First, you can not buy a 'used' Autoflash. Once an Autoflash has been plugged into a vehicle it is married to that VIN and will not operate in a different vehicle. It is a one-vehicle purchase. For that same reason, we can not offer any returns on it.

Second, The Autoflash remaps the TCU (Transmission Control Unit) not the ECU. By doing that we can change shift points, increase shift speed, and bypass torque limiters. It will not remove a RPM limit.

Third, The GOPedal does not interact with the TCU in any way. It does not change any software, it does not change shift behavior. It does remap throttle input seen by the ECU by sandwiching between the pedal and the ECU.

A GOPedal will make you get off the line faster and an Autoflash will keep that momentum climbing through a more aggressive and faster TCU operation.

None of these products add any power to your smart. They just change how the power is delivered and it makes a huge difference.
09-28-2018 11:51 AM
MB DNA Alles Auto cites a Cd of .345 for the second generation W451 series. The W450 and W451 series each have a frontal area of 21.0 sq ft and 22.14 sq ft respectively.

For comparison, the current Fiat 500 offers a .38 Cd and the first generation Honda Insight offers a Cd of .29.

https://en.wikipedia.org/wiki/Smart_Fortwo
09-28-2018 09:17 AM
fannum I did the research a few years back, and the 451 was listed as 0.32 and the current Corvette model as 0.33. fyi, the Viper was 0.45. We cited the same source, not corporate advertising. Also note that a Cd of 0.29 seems to be the lower limit for legal road cars. As an aero engineer friend stated, "Brochures are BS that you can fold"



I was then helping with cars for six universities to which we'd given smarts as a foundation for roadable commuter class entries for the Shell Eco-Marathon. I'll publish the full paper when I find it. It's been a while and several computers.


Also as a matter of curiosity, the McDonnell F-4 had a lower Cd than the Lockheed F-104. Based on real wind tunnel tests. https://en.wikipedia.org/wiki/Drag_coefficient#Aircraft



Cheers, Bob
(Full disclosure - I am a pilot, and flew the F-4 in the Navy, and currently fly a Lear 25 for Executive Jet)
09-28-2018 08:11 AM
MB DNA
Quote:
Originally Posted by fannum View Post
Actually, the smart has less aerodynamic drag than a sleek looking Corvette; both real drag and Cd.

The belly pan helps a lot ... little parasitic drag ... and very little internal drag associated with cooling, etc.

Sleek is not always better.

Cheers, Bob
Huh???

Thanks to MikeT on 6/28/2007 on clubsmartcar.com . . .

"The new 451 has a 0.35 drag coefficient, according to Le Moniteur Automobile.

The frontal area of the 450 is 1.95 square metres, so the SCd is 0.7215.

The frontal area of the 451 is 2.057 square metres, so its SCd is 0.7196."


http://clubsmartcar.com/index.php?/t...namics-take-2/

The MY08 base Corvette C6 has a 0.28 drag coefficient

Note, the C6 Z06 has aero tuning to reduce lift at high speed. This increases the Cd somewhat, but provides much needed stability at speed.

https://www.corvetteforum.com/forums...ntal-area.html
09-28-2018 07:22 AM
jwight
Wha???

Might want to check the numbers....

453 fortwo coupe has a Cd of 0.38 as best I can tell. I thought the 451 is similar but I can't seem to find any info on that. I know it is above 0.30....

The Corvette C5 coupe's Cd is 0.29; C6 coupe's Cd is 0.28 and the current C7's Cd is also 0.28.
09-27-2018 10:05 PM
fannum Actually, the smart has less aerodynamic drag than a sleek looking Corvette; both real drag and Cd.


The belly pan helps a lot ... little parasitic drag ... and very little internal drag associated with cooling, etc.


Sleek is not always better.


Cheers, Bob
09-27-2018 07:32 PM
Lucas Quintana I thought saying "without dumping 20%+ of what the car's worth into it" was a given statement. I wouldn't mind a little turbo powered smart, but you're absolutely right. Aerodynamics of a brick.
Wonder why they haven't made a slightly shorter version, with more of an angle on the windshield.
09-27-2018 07:29 PM
Lucas Quintana Good to know, thank you very much.
09-25-2018 12:21 PM
SmartMadness
Quote:
Originally Posted by Lucas Quintana View Post
But to my knowledge, the ecu flash also changes the timing of shifting, which is the entire purpose of the gopedal, do I have that wrong?
And if it's tethered to a single vin, that's really lame, but I guess if you make an item like this that no one else can really make, you can do stuff like that.
Quote:
Originally Posted by Lucas Quintana View Post
Just what the thread title says. I also would like to know if this can be used alongside the gopedal plus, or if it does what that does, along with removing the rpm limiter and governor?

So there are a few things we need to go over here.

First, you can not buy a 'used' Autoflash. Once an Autoflash has been plugged into a vehicle it is married to that VIN and will not operate in a different vehicle. It is a one-vehicle purchase. For that same reason, we can not offer any returns on it.

Second, The Autoflash remaps the TCU (Transmission Control Unit) not the ECU. By doing that we can change shift points, increase shift speed, and bypass torque limiters. It will not remove a RPM limit.

Third, The GOPedal does not interact with the TCU in any way. It does not change any software, it does not change shift behavior. It does remap throttle input seen by the ECU by sandwiching between the pedal and the ECU.

A GOPedal will make you get off the line faster and an Autoflash will keep that momentum climbing through a more aggressive and faster TCU operation.

None of these products add any power to your smart. They just change how the power is delivered and it makes a huge difference.
09-25-2018 08:47 AM
MB DNA
Quote:
Originally Posted by Lucas Quintana View Post
I will say that this car has too much drag for anything to really give it a big boost in performance, imo.
Not true - like all things, depends on just how deep your pockets are?

smart (hardly a high performance vehicle) has the aerodynamics of a brick! Unless you plan to invest cubic dollars - a go-fast smart fortwo is not in your future!

See post #10 - add a proper "hairdryer" and go fast . . .
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