PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

2 BAR SD Timing Table...

Thread Tools
 
Search this Thread
 
Old May 24, 2010 | 11:48 AM
  #1  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default 2 BAR SD Timing Table...

What does the PCM use to calculate airmass on a HP Tuners 2bar operating system?
Reply
Old May 24, 2010 | 03:09 PM
  #2  
Frost's Avatar
FormerVendor
iTrader: (45)
 
Joined: Jul 2005
Posts: 5,913
Likes: 2
From: Richmond VA
Default

basically MAP, IAT, ECT, and RPM, but I'm not sure if that's what you actually asking about.
Reply
Old May 24, 2010 | 03:22 PM
  #3  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default

Originally Posted by Frost
basically MAP, IAT, ECT, and RPM, but I'm not sure if that's what you actually asking about.
I am running in the bottom row of my timing table @ 8psi boost and I want to get it back up in the middle. I rescaled my MAF curve which shows it running @1.00 G/CYL @ 8psi but it's not giving me the timing I command. It seems like it's still running in the bottom row but it's plotting higher up in the histogram...

Hope that made sense...
Reply
Old May 24, 2010 | 04:43 PM
  #4  
foff667's Avatar
LS1TECH Sponsor
iTrader: (2)
 
Joined: Jul 2003
Posts: 7,986
Likes: 3
From: Clermont, FL
Default

They are calculated by the VE table, the pid in the scanner is a calculation g/cyl=ve*map/iat just keep in mind the ve table is normalized by a factor to give you a percentage.
Reply
Old May 24, 2010 | 05:02 PM
  #5  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default

So am I stuck with running in the bottom row of the timing table?
Reply
Old May 24, 2010 | 05:54 PM
  #6  
foff667's Avatar
LS1TECH Sponsor
iTrader: (2)
 
Joined: Jul 2003
Posts: 7,986
Likes: 3
From: Clermont, FL
Default

You likely could adjust the ifr/ve tables so that you are out of the last row.
Reply
Old May 24, 2010 | 05:59 PM
  #7  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default

Originally Posted by foff667
You likely could adjust the ifr/ve tables so that you are out of the last row.
Of course Trying that now...
Reply
Old May 24, 2010 | 08:31 PM
  #8  
Frost's Avatar
FormerVendor
iTrader: (45)
 
Joined: Jul 2005
Posts: 5,913
Likes: 2
From: Richmond VA
Default

Besides that, if you ran much higher boost, you could scale your injector and airflow settings.

Often a much easier approach is using an AFR spark modifier. Here is an example of how to set that up: http://www.hptuners.com/forum/showpo...8&postcount=11
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 May 24, 2010 | 08:41 PM
  #9  
bad6as's Avatar
11 Second Club
iTrader: (17)
 
Joined: Mar 2005
Posts: 4,796
Likes: 0
From: Maryland
Default

Originally Posted by Frost
Besides that, if you ran much higher boost, you could scale your injector and airflow settings.

Often a much easier approach is using an AFR spark modifier. Here is an example of how to set that up: http://www.hptuners.com/forum/showpo...8&postcount=11
hey quick question, whats my target a/f ratio?
Reply
Old May 24, 2010 | 11:48 PM
  #10  
Frost's Avatar
FormerVendor
iTrader: (45)
 
Joined: Jul 2005
Posts: 5,913
Likes: 2
From: Richmond VA
Default

Originally Posted by bad6as
hey quick question, whats my target a/f ratio?
Your boost is very low (like 3-4 psi for now) so as long as you are under 12, everything is fine. I am just being general because I don't have your file here on this laptop. It seems to me that it was around 11.4-11.6 the day we worked on it, but I don't recall 100%.

If you send me an email ans ask me to check logs and let you know what the deal was on that day, I'll have a look and let you know. I just got back form vacation late this afternoon though, and have about another 300 or so emails to answer to be back up to date.
Reply
Old May 25, 2010 | 04:22 AM
  #11  
10sec_rx7's Avatar
7 Second Club
 
Joined: Jan 2007
Posts: 259
Likes: 0
From: Sydney
Default

Originally Posted by foff667
You likely could adjust the ifr/ve tables so that you are out of the last row.
yep thats what i do with LS1's works a treat
Reply
Old May 25, 2010 | 09:57 AM
  #12  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default

Originally Posted by Frost
Besides that, if you ran much higher boost, you could scale your injector and airflow settings.

Often a much easier approach is using an AFR spark modifier. Here is an example of how to set that up: http://www.hptuners.com/forum/showpo...8&postcount=11
I also use that table for a over-boost protection. I just put in -20 degrees whenever I am commanding 1.4 EQ ratio (or richer). Then I went to the boost enrichment and set the commanded AFR to 1.4 @ 170 KPA & up. If I over boost then it will pull the 20 degrees out hopfully keeping it together...
Reply
Old May 25, 2010 | 09:59 AM
  #13  
Turbo 6.0's Avatar
Thread Starter
TECH Regular
15 Year Member
 
Joined: Nov 2006
Posts: 466
Likes: 0
Default

Originally Posted by foff667
You likely could adjust the ifr/ve tables so that you are out of the last row.
Set that up last night and it worked great! I took 30% out of the IFR and the VE and now @ 8 psi I am at about 1.00 G/CYL in the timing table.
Reply




All times are GMT -5. The time now is 06:14 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