PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

tranny shifting hard in SD mode

Thread Tools
 
Search this Thread
 
Old Jun 28, 2005 | 11:55 AM
  #1  
jmm98LS1's Avatar
Thread Starter
10 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (28)
 
Joined: Feb 2005
Posts: 3,975
Likes: 3
From: KS
Default tranny shifting hard in SD mode

Tried searching and didn't come up with much.
I set my MAF fail frequency to "0" to enter SD mode and reset my fuel trims so I can start logging for my attempt at tuning the VE tables. I got the p0103 code which is supposed to happen, but now my tranny goes into gear pretty hard and it shifts extremely hard under part throttle. Shifting at 4krpm under 50% throttle breaks the back end loose. Any idea what's happening here?...and am I hurting anything?
Also the car absolutely will not idle in gear in SD mode, anyone else have that problem? Thanks for your help guys!!! Using HPTuner, btw.

Last edited by jmm98LS1; Jun 28, 2005 at 01:06 PM.
Reply
Old Jun 28, 2005 | 11:59 AM
  #2  
HumpinSS's Avatar
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default

what package are you using to tune your car
Reply
Old Jun 28, 2005 | 12:22 PM
  #3  
SmokingWS6's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Jun 2004
Posts: 1,795
Likes: 2
From: St. Louis MO
Default

In SD mode with fail frequency at 0 the trans reverts to max pressure all the time. It makes for a fun drive while VE tuning. You could lower your max line pressure while tuning but I left mine alone.
Reply
Old Jun 28, 2005 | 01:06 PM
  #4  
jmm98LS1's Avatar
Thread Starter
10 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (28)
 
Joined: Feb 2005
Posts: 3,975
Likes: 3
From: KS
Default

Originally Posted by SmokingWS6
In SD mode with fail frequency at 0 the trans reverts to max pressure all the time. It makes for a fun drive while VE tuning. You could lower your max line pressure while tuning but I left mine alone.
Thanks for the help. So with every shift using max line pressure, am I hurting anything? I'm sure it'll take me awhile to dial in the VE table so I don't know how long I'll have to drive in SD mode. It sure is fun as hell driving though!
Reply
Old Jun 28, 2005 | 01:13 PM
  #5  
HumpinSS's Avatar
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default

Eventaully it MAY (I am not sure) burn out the pump
Reply
Old Jun 28, 2005 | 01:14 PM
  #6  
SSpdDmon's Avatar
TECH Addict
iTrader: (10)
 
Joined: Jun 2004
Posts: 2,918
Likes: 0
From: Commerce Twp, MI
Default

That must be one of those '98 things, right? Mine doesn't do it and I'd be freakin' if it did. That puts extra, unnecessary strain on the tranny and drivetrain.
Reply
Old Jun 28, 2005 | 01:18 PM
  #7  
HumpinSS's Avatar
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default

pre-2k iirc
Reply
Old Jun 28, 2005 | 01:41 PM
  #8  
jmm98LS1's Avatar
Thread Starter
10 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (28)
 
Joined: Feb 2005
Posts: 3,975
Likes: 3
From: KS
Default

god I love having a '98
at least we got decent injectors....but that's about it.
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 Jun 28, 2005 | 01:50 PM
  #9  
SmokingWS6's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Jun 2004
Posts: 1,795
Likes: 2
From: St. Louis MO
Default

Originally Posted by jmm98LS1
god I love having a '98
at least we got decent injectors....but that's about it.
Hey now don't forget the sweet blue tinted rear view mirrors(on the ta), auburn posi, and best of all a functional Temp guage
Reply
Old Jun 28, 2005 | 02:35 PM
  #10  
jmm98LS1's Avatar
Thread Starter
10 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (28)
 
Joined: Feb 2005
Posts: 3,975
Likes: 3
From: KS
Default

Originally Posted by SmokingWS6
Hey now don't forget the sweet blue tinted rear view mirrors(on the ta), auburn posi, and best of all a functional Temp guage

Good point...it is nice knowing the actual water temp without looking over at the laptop. I'm sure that even that nice auburn posi is going to grenade anyway (hopefully not for awhile...i can't afford a 12bolt yet)
Reply




All times are GMT -5. The time now is 02:04 PM.

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