PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

need help with efi live sd tune.....

Thread Tools
 
Search this Thread
 
Old Jun 10, 2008 | 08:39 AM
  #21  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Originally Posted by Goldfinger911
I noticed he is running a 90mm TB and the IAC Effective Area is set up for a 78mm TB. This will hurt idle, especially on a cammed LS. After this is changed, he needs to redo RAFIG to get desired airflow at idle.
One thing at a time fellas.

First, you can't effectively change the IAC effective area since every throttle body is different, and it would just be a guessing game. I've still got my stock parameter IAC effective area set. No problem.

The minimum spark advance is a little high, but it shouldn't pose any problems right now. Spark while cranking doesn't need to be touched.

Remember, one step at a time otherwise you'll be chasing your tail around all day long trying to figure out what actually changed what!
Reply
Old Jun 10, 2008 | 09:01 AM
  #22  
ls2 bait's Avatar
Thread Starter
9 Second Club
iTrader: (11)
 
Joined: May 2005
Posts: 4,507
Likes: 5
From: in your closet
Default

wow there is a good bit of stuff to look thru when u tune a car huh haha. the cam in the car is crap. its going to be getting changed in the coming months but what gets learned here can be applied then too current cam is a 247/ 254 .623/ .623 114.5 centerline.
Reply
Old Jun 10, 2008 | 11:30 AM
  #23  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Are you sure your cam is crap, what makes it crap?? Difficulty in tuning/driving conditions? That sounds like a pretty health cam! If anything it may even be a little bit on the large side. Do you have a dyno graph you could post up?
Reply
Old Jun 10, 2008 | 09:03 PM
  #24  
ls2 bait's Avatar
Thread Starter
9 Second Club
iTrader: (11)
 
Joined: May 2005
Posts: 4,507
Likes: 5
From: in your closet
Default

Originally Posted by Haans249
Are you sure your cam is crap, what makes it crap?? Difficulty in tuning/driving conditions? That sounds like a pretty health cam! If anything it may even be a little bit on the large side. Do you have a dyno graph you could post up?
well the cam is prob fine but its not designed for this motor. its bitchy as hell under low rpm load (misfire city) and it just isnt making any respectful power with the rest of the combo. i def think its on the big side for my heads.

cutout open


cutout closed
Reply
Old Jun 10, 2008 | 09:54 PM
  #25  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Actually, you're making GREAT power! You shouldn't be snotting at that! You might have a little too much overlap, picking a cam with a tighter overlap might net you a few more horsepower, definitely more low end, but like I said, you're making good power.
As far as the cam being bitchy in the low rpm cruising, that is taken out by tuning. It takes a while, but you will eventually find where the cam likes to be when cruising as far as spark timings go and AFR's. Once we get your idle straightened up, I can step you through getting your low rpm loads undercontrol. The misfires might be caused from being too lean, but we'll get there soon.
Reply
Old Jun 10, 2008 | 10:04 PM
  #26  
gametech's Avatar
TECH Veteran
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Top Answer: 1
iTrader: (1)
 
Joined: Sep 2004
Posts: 4,915
Likes: 908
From: Stockbridge GA
Default

Originally Posted by ls2 bait
didnt get to try it. got tied up. going to try it on weds hopefully. also while i have your attention my previous tuner seems to have disabled my ability to track misfires somehow. i cant even see them on a tech 2. what could they have done to do that? and how the hell would i fix it?
Some PCMs will NOT report misfires after disabling O2 and CAT codes. I have absolutely NO idea why, but this DOES happen in some cases. I don't know about your PCM in particular. Unfortunately, I just help tune random cars for friends, so I can't say for sure if it is specifically related to certain years/vins, or what.
Reply
Old Jun 10, 2008 | 10:48 PM
  #27  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Originally Posted by gametech
Some PCMs will NOT report misfires after disabling O2 and CAT codes. I have absolutely NO idea why, but this DOES happen in some cases. I don't know about your PCM in particular. Unfortunately, I just help tune random cars for friends, so I can't say for sure if it is specifically related to certain years/vins, or what.
I double checked your tune file, and it does appear that engine misfire detection is fully enabled, interesting...
Reply
Old Jun 10, 2008 | 11:25 PM
  #28  
gametech's Avatar
TECH Veteran
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Top Answer: 1
iTrader: (1)
 
Joined: Sep 2004
Posts: 4,915
Likes: 908
From: Stockbridge GA
Default

To expand on this further, I have heard (anecdotal only, no scientific evidence yet), that disabling emissions codes can disable other seemingly random PCM functions in a variety of cars. I have no idea if this is incidental to the computer code or intentional by the OEMs.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

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

 Verdad Gallardo
story-4

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

 Pouria Savadkouei
story-5

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

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

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

 Verdad Gallardo
Old Jun 11, 2008 | 09:54 AM
  #29  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Does anyone know if running in OL will disable the Misfire detection?
Reply
Old Jun 11, 2008 | 05:55 PM
  #30  
ls2 bait's Avatar
Thread Starter
9 Second Club
iTrader: (11)
 
Joined: May 2005
Posts: 4,507
Likes: 5
From: in your closet
Default

Originally Posted by Haans249
Does anyone know if running in OL will disable the Misfire detection?
well even when we had it in closed loop the misfire detection wasnt working. we were trying to locate which cylinder was misfiring. the tech 2 wouldnt even locate it.
Reply
Old Jun 12, 2008 | 04:31 AM
  #31  
cablebandit's Avatar
9 Second Club
20 Year Member
iTrader: (37)
 
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
Default

mines in olsd and wont do misfire detection..
Reply
Old Jun 13, 2008 | 07:33 PM
  #32  
ls2 bait's Avatar
Thread Starter
9 Second Club
iTrader: (11)
 
Joined: May 2005
Posts: 4,507
Likes: 5
From: in your closet
Default

guess ill have to live with that. my balancer came apart so i didnt get to really try it out for more then the drive home. gonna swap the balancer out sunday and give her a shot.
Reply
Old Jun 18, 2008 | 07:48 PM
  #33  
ls2 bait's Avatar
Thread Starter
9 Second Club
iTrader: (11)
 
Joined: May 2005
Posts: 4,507
Likes: 5
From: in your closet
Default

well it helped a little bit but still some issues. i think im going to wait until the new cam goes in before i go much more in depth with it.
Reply
Old Jun 20, 2008 | 09:50 PM
  #34  
Haans249's Avatar
TECH Addict
iTrader: (24)
 
Joined: May 2005
Posts: 2,045
Likes: 4
From: Fort Worth, TX
Default

Hey good to hear that it helped out a little. As far as waiting for the new cam, right now would be an excellent time to really hone in your tuning skills with a little "more difficult" to tune cam. While getting my idles worked out, i had to change a vast amount of tables to get things evened out. Many of the tables' stock parameters are WAY too much for a "tougher" cam. They cause the engine to swing wildly in idle and causing stumbles. It takes very little air and spark adjustments to get things evened out. If you would like to know more please shoot me a PM and I can show you many different things to try and track down the root causes of your idle whoa's. Just for example, I have my idle down to 750 rpms currently, and it wasn't easy, but doable.
Reply




All times are GMT -5. The time now is 09:38 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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