Nissan 370Z Forum  

Smooth Throttle for UpRev

I really don't know what the numbers mean, so I couldn't tell you for sure about the significance of negative values. I think just flipping the sign on them is

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Tuning


Like Tree60Likes

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 09-30-2013, 10:17 PM   #11 (permalink)
A True Z Fanatic
 
wstar's Avatar
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3595
wstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond reputewstar has a reputation beyond repute
Default

I really don't know what the numbers mean, so I couldn't tell you for sure about the significance of negative values. I think just flipping the sign on them is probably a bad idea, as that would be a big jump in value. I know it's nothing as simple as "values below zero cut fuel/spark and go into engine braking", because we can easily get engine braking at deeper pedal positions than the chart goes negative for at high RPMs, e.g. if you play around with the pedal while sitting at say 5-6K rpm in 2nd or 3rd.

Keep in mind that in my original experiments, I didn't have to move all that far away from factory values to get very ugly behaviors that weren't drivable *at all*. Experiments are at your own risk, and scary things can happen. Some of the odd behaviors I remember from testing maps that were just a little too much out of range or out of shape in various areas include things like:

1) The accel pedal seeming to act normal for the first 15-20% of pedal range, and then you move it a hair further and the car suddenly leaps into full throttle out of nowhere, scaring the **** out of you and breaking traction.
2) The pedal seeming to act normal to nearly full throttle, but then when you hit full throttle the car acts like it's past a rev limiter (when it isn't) and cuts fuel/spark dramatically, shocking the drivetrain if you were in the midst of acceleration or shifting.
3) The pedal seems extremely unresponsive for the first half or so, so you keep pushing your foot down, then it suddenly responds out of nowhere and floors the engine..
etc...

Be sure you're on a wide open road clear of traffic if you experiment with crazy values in this table...
__________________
7AT Track Car!
Journal thread / Car setup details

Last edited by wstar; 09-30-2013 at 10:22 PM.
wstar is offline   Reply With Quote
 

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
370Z FI Throttle Response: Boost vs. Throttle Position DIGItonium Forced Induction 9 01-23-2011 08:49 PM
Adjusting Throttle Response with UpRev? AlphaSnacks Tuning 4 12-05-2010 03:40 AM
2nd gear not as smooth as the others??? VQinside Engine & Drivetrain 14 11-03-2010 09:22 PM
UpRev Osiris/Technosquare users- throttle mapping? SE Tuning 3 08-29-2010 05:03 PM
Smooth launch in 1st Gear? BrianMSmith Nissan 370Z General Discussions 22 03-26-2010 10:40 PM


All times are GMT -5. The time now is 06:16 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2