Smooth Throttle for UpRev

jrb55gh · 05-07-2014, 08:21 PM

This post may not be anything special to the track guys, but there is something worth mentioning to the street guys with a 7AT. I just completed the current Dynotronics Ecutek remote tune on my 2013 7AT. The car is completely stock and street driven smoothly with restraint when the wife is along but with gusto when she’s not.

On the street in stop and go traffic the stock throttle response has an annoying delay that is actually dangerous in slow, tight situations that require quick acceleration. From what I read in this thread it appears that wstar has developed a throttle table (2300) in Uprev that cuts the delay but accelerates hard with very little throttle pedal input. This sort of throttle response is ok with the 6MT in street traffic because the clutch can be used to modulate the torque to the rear wheels. However, on 7AT cars with stock stall speeds, smooth starts in heavy traffic require extreme throttle foot control. Wstar also commented “the curves are backwards from where they should be for drivability”. Soft response without delay at small throttle pedal inputs makes street driving more relaxed and might be a benefit on the track. I think I have this now with the tune in my Z.

The first try for a suitable throttle response curve was a 1:1 coupling of the throttle pedal to the throttle. This resulted virtually in no delay but the engine almost jumps out of the car with a short ¼ throttle stab at the pedal. It was impressively quick reving in neutral but difficult to drive with an automatic on the street. After a few iterations of logging data and adjusting throttle response to throttle pedal inputs, the delay is nil and the action of the throttle is smooth and gradual at throttle pedal inputs up to about 10%, but responds like gang busters if you put your foot in it.

Jordo! · 05-07-2014, 08:30 PM

Quote:

Originally Posted by jrb55gh

This post may not be anything special to the track guys, but there is something worth mentioning to the street guys with a 7AT. I just completed the current Dynotronics Ecutek remote tune on my 2013 7AT. The car is completely stock and street driven smoothly with restraint when the wife is along but with gusto when she’s not.

On the street in stop and go traffic the stock throttle response has an annoying delay that is actually dangerous in slow, tight situations that require quick acceleration. From what I read in this thread it appears that wstar has developed a throttle table (2300) in Uprev that cuts the delay but accelerates hard with very little throttle pedal input. This sort of throttle response is ok with the 6MT in street traffic because the clutch can be used to modulate the torque to the rear wheels. However, on 7AT cars with stock stall speeds, smooth starts in heavy traffic require extreme throttle foot control. Wstar also commented “the curves are backwards from where they should be for drivability”. Soft response without delay at small throttle pedal inputs makes street driving more relaxed and might be a benefit on the track. I think I have this now with the tune in my Z.

The first try for a suitable throttle response curve was a 1:1 coupling of the throttle pedal to the throttle. This resulted virtually in no delay but the engine almost jumps out of the car with a short ¼ throttle stab at the pedal. It was impressively quick reving in neutral but difficult to drive with an automatic on the street. After a few iterations of logging data and adjusting throttle response to throttle pedal inputs, the delay is nil and the action of the throttle is smooth and gradual at throttle pedal inputs up to about 10%, but responds like gang busters if you put your foot in it.

Can you post the hexadecimal code for the map, both the first (1:1) vs he one you arrived at?

jrb55gh · 05-08-2014, 08:52 PM

Quote:

Originally Posted by Jordo!

Can you post the hexadecimal code for the map, both the first (1:1) vs he one you arrived at?

Jordo,

I do not have access to the hex files in my Dynotronics tune for the throttle response. However, I can post the data logging graphs of the actual throttle, VVT, VVEL responses to throttle pedal input. Apparently these responses are accomplished by bypassing the Uprev throttle table and directly specifying each parameter in the Ecutek software.

The first plot is the throttle opening in degrees (green), VVEL (yellow), VVT (blue) vs. throttle pedal sensor voltage in a 2000 rpm roll on. Idle is about .7 volts and full throttle is about 4.66 volts.

The second plot is the standing start data with the VVT (blue) incorporated into the same graph.

The third plot is the throttle opening in degrees (green) and VVEL (yellow) vs. throttle pedal sensor voltage in a normal standing start.

V1H · 09-05-2014, 02:58 AM

Quote:

Originally Posted by jrb55gh

Jordo,

I do not have access to the hex files in my Dynotronics tune for the throttle response. However, I can post the data logging graphs of the actual throttle, VVT, VVEL responses to throttle pedal input. Apparently these responses are accomplished by bypassing the Uprev throttle table and directly specifying each parameter in the Ecutek software.

The first plot is the throttle opening in degrees (green), VVEL (yellow), VVT (blue) vs. throttle pedal sensor voltage in a 2000 rpm roll on. Idle is about .7 volts and full throttle is about 4.66 volts.

The second plot is the standing start data with the VVT (blue) incorporated into the same graph.

The third plot is the throttle opening in degrees (green) and VVEL (yellow) vs. throttle pedal sensor voltage in a normal standing start.

Very interesting and insightful datalog, m8!
If I interpret your data correctly, the VVT and VVL reach their final values at around 25% throttle plate position, which means that beyond this point the engine load is indeed controlled by further opening the throttle plate only, not valve lift.

Awgd8 · 09-06-2014, 09:48 AM

Pm

Awgd8 · 09-06-2014, 01:12 PM

I did try the map above and it seems like my low end gets a bit smoother than the modified #2, and the mid to top end are a lot better with this map 3.

If I could blend the lowend of map 2 and mid/top end response of map 3, it should have been perfect. Map 2 seems like the best blend of low end street us and highway mid to top end. Map 3 is best for G37 low end gearing, not aggressive enough for my non close gearing 5 speed A/T, but smooth low end with more oomph at the mid to top...

Awgd8 · 09-06-2014, 06:59 PM

Pm

09-06-2014, 09:48 AM	#5 (permalink)
Awgd8 Base Member Join Date: Sep 2013 Location: WI Posts: 165 Drives: 2015 Q40 / 2008 EX35 Rep Power: 12	Pm Last edited by Awgd8; 05-05-2015 at 06:03 PM.

09-06-2014, 01:12 PM	#6 (permalink)
Awgd8 Base Member Join Date: Sep 2013 Location: WI Posts: 165 Drives: 2015 Q40 / 2008 EX35 Rep Power: 12	I did try the map above and it seems like my low end gets a bit smoother than the modified #2, and the mid to top end are a lot better with this map 3. If I could blend the lowend of map 2 and mid/top end response of map 3, it should have been perfect. Map 2 seems like the best blend of low end street us and highway mid to top end. Map 3 is best for G37 low end gearing, not aggressive enough for my non close gearing 5 speed A/T, but smooth low end with more oomph at the mid to top... Last edited by Awgd8; 09-06-2014 at 01:33 PM.

09-06-2014, 06:59 PM	#7 (permalink)
Awgd8 Base Member Join Date: Sep 2013 Location: WI Posts: 165 Drives: 2015 Q40 / 2008 EX35 Rep Power: 12	Pm Last edited by Awgd8; 05-05-2015 at 06:04 PM.

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05-07-2014, 08:21 PM	#1 (permalink)
jrb55gh Base Member Join Date: Mar 2013 Location: DFW Texas Posts: 149 Drives: '13 370z black 7AT Rep Power: 13	This post may not be anything special to the track guys, but there is something worth mentioning to the street guys with a 7AT. I just completed the current Dynotronics Ecutek remote tune on my 2013 7AT. The car is completely stock and street driven smoothly with restraint when the wife is along but with gusto when she’s not. On the street in stop and go traffic the stock throttle response has an annoying delay that is actually dangerous in slow, tight situations that require quick acceleration. From what I read in this thread it appears that wstar has developed a throttle table (2300) in Uprev that cuts the delay but accelerates hard with very little throttle pedal input. This sort of throttle response is ok with the 6MT in street traffic because the clutch can be used to modulate the torque to the rear wheels. However, on 7AT cars with stock stall speeds, smooth starts in heavy traffic require extreme throttle foot control. Wstar also commented “the curves are backwards from where they should be for drivability”. Soft response without delay at small throttle pedal inputs makes street driving more relaxed and might be a benefit on the track. I think I have this now with the tune in my Z. The first try for a suitable throttle response curve was a 1:1 coupling of the throttle pedal to the throttle. This resulted virtually in no delay but the engine almost jumps out of the car with a short ¼ throttle stab at the pedal. It was impressively quick reving in neutral but difficult to drive with an automatic on the street. After a few iterations of logging data and adjusting throttle response to throttle pedal inputs, the delay is nil and the action of the throttle is smooth and gradual at throttle pedal inputs up to about 10%, but responds like gang busters if you put your foot in it.