PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Downshift for passing tune

Thread Tools
 
Search this Thread
 
Old Oct 22, 2013 | 07:02 PM
  #1  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default Downshift for passing tune

I have a 4l80e that I want to tune so that it will downshift in a passing situation. Right now I have to almost floor it to get it to downshift from fourth to third and OD to third. Should I change the TPS to WOT settings?
Reply
Old Oct 22, 2013 | 09:31 PM
  #2  
2xLS1's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (25)
 
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Default

No...
Reply
Old Oct 22, 2013 | 10:14 PM
  #3  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default

Originally Posted by 2xLS1
No...
Lol.....thanx. Would you care to share a little more info or guidance?
Reply
Old Oct 22, 2013 | 11:33 PM
  #4  
2xLS1's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (25)
 
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Default

Sure just as soon as you share a little more info on the vehicle. And maybe some info on what you are using to tune with.
Reply
Old Oct 23, 2013 | 12:30 AM
  #5  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default

Ok. Its an LQ9 iron block 403 with 9.5 comp, F1A Procharger, Edelbrock intake, 83bl injectors, FTI 3600 stall and 4l80e. My last WOT log showed approx 13psi boost using Hptuners Pro software.

Last edited by Monte4ever; Oct 23, 2013 at 12:37 AM.
Reply
Old Oct 23, 2013 | 12:37 AM
  #6  
2xLS1's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (25)
 
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Default

Geez. What computer and vehicle cal is in it. You know. Info that might be relevant to the tables in the calibration.
Reply
Old Oct 23, 2013 | 01:12 AM
  #7  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default

Oh - ok lol........Its a 411 PCM with a 2002 Camaro OS. I'm at work so off hand I think the last three numbers of the OS is 156. It has the 4l80e segment swap.

Last edited by Monte4ever; Oct 23, 2013 at 03:28 AM.
Reply
Old Oct 23, 2013 | 04:43 AM
  #8  
Mister Peebody's Avatar
Teching In
 
Joined: May 2006
Posts: 31
Likes: 0
From: Texas
Default

Curious as to why you want it to downshift. I tuned my A4 to only downshift from 4th to 3rd, never 3rd to 2nd, or 2nd to 1st. I did this because even with drag radials 1st and 2nd are useless over 35% TPS. You should be making near or above 700rwhp with your combo so your power band should be such that you don't need the gear especially with the 3600 stall. Any way, if you are using HPTuners then:
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.

Last edited by Mister Peebody; Oct 23, 2013 at 04:56 AM.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Oct 23, 2013 | 08:50 AM
  #9  
2xLS1's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (25)
 
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Default

In the highlighted cells, once you are above that MPH it won't downshift. Put higher numbers in those cells to make it downshift with less throttle input. One way you can do it is to decide on a spread between the upshift mph and the downshift mph for each tps setting. For example on the 2-3 ans 3-2 try something like 15 mph. For every cell where the difference between the two numbers is more than 15 mph, increase the number in that downshift cell to where the difference is 15. Try different spreads until it is downshifting how you want it to.
Attached Thumbnails Downshift for passing tune-downshift.jpg  
Reply
Old Oct 24, 2013 | 04:23 PM
  #10  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default

Originally Posted by Mister Peebody
Curious as to why you want it to downshift. I tuned my A4 to only downshift from 4th to 3rd, never 3rd to 2nd, or 2nd to 1st. I did this because even with drag radials 1st and 2nd are useless over 35% TPS. You should be making near or above 700rwhp with your combo so your power band should be such that you don't need the gear especially with the 3600 stall. Any way, if you are using HPTuners then:
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.
Thanks for the reply. I am looking for it to downshift from 4th to 3rd for passing. I cruise around in 4th gear on the street most of the time.

Last edited by Monte4ever; Oct 24, 2013 at 04:30 PM.
Reply
Old Oct 24, 2013 | 04:25 PM
  #11  
Monte4ever's Avatar
Thread Starter
TECH Fanatic
15 Year Member
iTrader: (2)
 
Joined: Aug 2008
Posts: 1,160
Likes: 4
From: MI
Default

Originally Posted by 2xLS1
In the highlighted cells, once you are above that MPH it won't downshift. Put higher numbers in those cells to make it downshift with less throttle input. One way you can do it is to decide on a spread between the upshift mph and the downshift mph for each tps setting. For example on the 2-3 ans 3-2 try something like 15 mph. For every cell where the difference between the two numbers is more than 15 mph, increase the number in that downshift cell to where the difference is 15. Try different spreads until it is downshifting how you want it to.
2xLS1 thanx for the info. I will give this a try.
Reply




All times are GMT -5. The time now is 03:32 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE