inthehunt2

Has anyone else quantified the paddle shifter delay? By this I mean the delay between when you hit the "+" button and when the Tachometer needle actually stops going up and starts to go down indicating the start of a shift event.

I am not sure if you saw my other thread about A6 shift times. If not, you can see the thread at: http://forums.corvetteforum.com/c6-c...g-problem.html.

Using these same videos, I decided to now quantify the delay in the paddle shifters (how long it takes to start a shift after hitting the "+" button). The test conditions varied as follows:

In “D”
In “S” w/o using paddles
In “S” w/ using paddles
In “S” and "COMP" w/o using paddles
In “S” and "COMP" w/ paddles

All tests were WOT off the line.

The summary is this...

I first captured the time it took to achieve 4000, 4500, 5000, 5500, 6000, 6500 as time stamped on the video (time stamp value varies depending on when the video started).

Here is the summary in chart form:



Next, I calculated the split times at each 500 RPM mark establishing 4000 RPM as a reference 0:00.00 time. Note that on the right side of this next insert that I show the average, standard deviation, hi, lo, and spread. Note how consistent the data is regardless of mode ("D" or "S", "COMP" or no "COMP", paddle or no paddle). This indicates that my method, although not perfect, is good enough to make a point.

Here's the insert...



Now, here comes the seat-of-the-pants part of the evaluation. I found that if I hit the the "+" button at 5500 RPM that I would not hit the rev limiter during a shift event. I also found that if I hit the "+" button at 6000 RPM that I would hit the rev limiter during the shift. I also found that if I hit the "+" button at 5800 RPM that I would sometimes not hit the rev limiter and other times I would. Since the rev limiter is at 6500 RPM, this gives an indication of how much of a delay there is between when you hit the "+" button and when the transmission actually begins a shift sequence.

Now, looking at the averages above, you can easily calculate the time it takes for the engine to go from 5000 RPM to 5500 RPM, as well as 5500 RPM to 6000 RPM and between 6000 RPM and 6500 RPM. More importantly, you can calculate the delay between hitting the "+" button and the trans starts to shift with the information above.

If 5500 RPM never hits the rev limiter and 6000 always hits the rev limiter and 5800 sometimes hits the rev limiter, then you can calculate the amount of time it takes the tranny to start a shift sequence by knowing how long it takes the engine to accelerate from one RPM to another RPM. Knowing where the "sweet spot" is for hitting the paddles (about 5800 RPM) and knowing the rate of engine RPM climb from 5800 to 6500, you can calculate the equivalent delay inherent in the paddle buttons (or the processing of the paddle button inputs and the scheduling of the shift).

Here's the insert for this...




Has anyone else quantified this delay between pressing the "+" and having the transmission actually start a shift sequence???

Here are the videos if you're interested....

kev1n

This is good stuff. Subscribed for future reference

knkali

Inthehunt,

dude, you are awesome. Total attention to detail. I love it.

BSE1956

WOW. More information than I can usuall handle, but good to know anyway.
Any change or improvement on the 09's transmission?

inthehunt2

All I know through reading is that moving from '07 to '08 that there was supposed to be a 40% improvement on downshifts and a 20% improvement on upshifts.

cmonkey713

My tuner helped mine considerably.

BLYOTH

How do you put it in “S” and COMP mode? I only knew about the "S"

inthehunt2

Press the Traction Control button on the console next to the shifter/gear selector twice, or hold the button for ~5 seconds. This is what puts it into COMP mode. To put it in "S" on the A6, just move your gear selector to the "S" position.

budmont

Fantastic info, Thanks!

NOCRISIS

that is very ,,,,,you got a bit of rubber in "S" no paddles and comp mode,,in second gear,,,,paddles seemed a bit soft on the shift?

I have hit the rev limiter also,,,,and blown a shift,,with the paddles,,very annoying.

FIREMANMIKE

So you mean to say when the display says traction and active handling off the cars in comp mode???

inthehunt2

It should say "Competition Driving Mode" on the DIC when you have it set. Check out my videos to see the message.

Migs08

Very impressive research!



I think I have posted in previous threads that my A6 paddle shift delay seemed to be about 1/2 to 3/4 sec. But I was just "guestimating." Looks like I wasn't too far off.

In WOT I try to hit the paddle no later than 5800 rpm, shifting 1st to 2nd.

CorvetteHulk

Dude - this is good stuff

CorvetteHulk

Hey IntheHunt2,

PM sent on a question... thanks!

inthehunt2

Just sent a response...

inthehunt2

I will be posting another thread about optimal shift points based upon gear ratio and the LS3's HP curve in another thread shortly. Additionally, this new thread will show some data on the actual shift points of the tranny during WOT conditions for 1-2 shifts.

mgtr

This is very interesting info to have. I have not absorbed the full implications of the data yet.

CorvetteHulk

INTHEHUNT2 - PM sent.

Thanks for researching

Hulk

LowFlight

Thanks