PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Advice on these wacky ltrims

Thread Tools
 
Search this Thread
 
Old Sep 11, 2002 | 01:06 PM
  #1  
MY99TAWS6's Avatar
Thread Starter
TECH Veteran
iTrader: (3)
 
Joined: Apr 2002
Posts: 4,719
Likes: 3
From: Kelowna,BC
Default Re: Advice on these wacky ltrims

I have a much simpler method.I just watch the ltrims in real time..ignore idle..step on gas..watch what happens..don't go full throttle.
Keep it part throttle..dont bother looking at decel..mine are slightly negative or go zero at wot..done..easy..this averaging stuff is for the birds..I can do same thing even easier on my scanmaster..don't need to worry about cells or anything..its not rocket science..just watch the ltims..
Reply
Old Sep 11, 2002 | 01:27 PM
  #2  
98TAauto's Avatar
TECH Veteran
iTrader: (2)
 
Joined: Nov 2001
Posts: 4,316
Likes: 0
From: Warsaw, Va
Default Re: Advice on these wacky ltrims

oh i have about 10 mins of driving around. I just didnt want to post the whole thing <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

average for B1 was 17.48
average for B2 was 17.08
Reply
Old Sep 11, 2002 | 02:22 PM
  #3  
NoGo's Avatar
TECH Addict
20 Year Member
Photogenic
Photoriffic
iTrader: (2)
 
Joined: Jan 2002
Posts: 2,814
Likes: 110
From: Mass
Default Re: Advice on these wacky ltrims

Your LTerms look like they are tracking normally, just that you are running a little on the lean side.

Try multiplying your entire MAF table by 105% at first, and see what your resulting LTerms are.

Your LTerms during normal driving are going to be all over the place. When I first got A-tap, I was a little confused by this and figured that my LTerms should be pretty constant. Obviously I was wrong.
Reply
Old Sep 11, 2002 | 03:55 PM
  #4  
98TAauto's Avatar
TECH Veteran
iTrader: (2)
 
Joined: Nov 2001
Posts: 4,316
Likes: 0
From: Warsaw, Va
Default Re: Advice on these wacky ltrims

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NoGo:
<strong>Your LTerms look like they are tracking normally, just that you are running a little on the lean side.

Try multiplying your entire MAF table by 105% at first, and see what your resulting LTerms are.

Your LTerms during normal driving are going to be all over the place. When I first got A-tap, I was a little confused by this and figured that my LTerms should be pretty constant. Obviously I was wrong.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">im gonna go out and try that in a few... 105-107 should be about what i need... i just want to get them in the average range of -10 to +10
Reply
Old Sep 11, 2002 | 04:16 PM
  #5  
DenzSS's Avatar
TECH Fanatic
 
Joined: Nov 2001
Posts: 1,248
Likes: 0
From: Kansas City, MO
Default Re: Advice on these wacky ltrims

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 98TAauto:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NoGo:
<strong>Your LTerms look like they are tracking normally, just that you are running a little on the lean side.

Try multiplying your entire MAF table by 105% at first, and see what your resulting LTerms are.

Your LTerms during normal driving are going to be all over the place. When I first got A-tap, I was a little confused by this and figured that my LTerms should be pretty constant. Obviously I was wrong.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">im gonna go out and try that in a few... 105-107 should be about what i need... i just want to get them in the average range of -10 to +10</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Aim for closer to -2% to -3%. You should be able to hit that pretty easily. +/-10% is way too large of a margin.
Reply
Old Sep 11, 2002 | 07:09 PM
  #6  
98TAauto's Avatar
TECH Veteran
iTrader: (2)
 
Joined: Nov 2001
Posts: 4,316
Likes: 0
From: Warsaw, Va
Default Re: Advice on these wacky ltrims

ok guys... i tried 105%

average was 13.3 and 12.2 cruisin

so should i go 105 again??

also my 02's were around .89 and .90

will they get "leaner" if i mult the MAF again by 105%??
Reply
Old Sep 11, 2002 | 07:13 PM
  #7  
DenzSS's Avatar
TECH Fanatic
 
Joined: Nov 2001
Posts: 1,248
Likes: 0
From: Kansas City, MO
Default Re: Advice on these wacky ltrims

Go about 115%
Reply
Old Sep 12, 2002 | 12:38 AM
  #8  
98TAauto's Avatar
TECH Veteran
iTrader: (2)
 
Joined: Nov 2001
Posts: 4,316
Likes: 0
From: Warsaw, Va
Default Advice on these wacky ltrims

LTerm Fuel Trim B2(%)
Both sides are bascially doing the same, but you get the general idea from these numbers. Those are anywhere from idle to 4400 rpms. Seems when i got up around 4400 the ltrims dropped to around 0-9 of both sides.
Should i put the stock MAF ends back in to get them closer to -+10 or tune the MAF? At idle im somtimes reading 19-24 on them.
9.4
10.9
11.7
10.9
11.7
13.3
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
14.8
11.7
9.4
9.4
9.4
10.9
9.4
9.4
14.8
15.6
15.6
14.1
11.7
10.2
11.7
9.4
17.2
17.2
17.2
11.7
10.9
12.5
14.8
13.3
14.8
9.4
9.4
11.7
14.8
14.8
15.6
17.2
17.2
16.4
10.9
17.2
17.2
17.2
17.2
18
17.2
17.2
17.2
17.2
18
18
17.2
17.2
17.2
17.2
17.2
18
18
18
18
18
18
18.8
18.8
17.2
11.7
16.4
14.1
16.4
14.8
17.2
18

HDD(Crazyfarmer)
EFA Administrator
98 TA A4 3.23's
1.58 60'nittos
11.95@112.6 NA Before Cam
LS1Speed 224 cam
SlowLS1.com | PPO | TNT Install Files | Eastern F-Body Association
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 Sep 12, 2002 | 12:55 AM
  #9  
Dom's Avatar
Dom
TECH Fanatic
iTrader: (2)
 
Joined: Nov 2001
Posts: 1,380
Likes: 1
From: Chicago
Default Re: Advice on these wacky ltrims

You have to make a much bigger file. Drive around for 15min or more. Get rid of all the cells that aren't partial throttle.

Cells 0-5, 21 (no load)
Cells 17-20 (idle)
Cells 6-14 (part throttle)
Cells 22 & 15 (WOT)

Now with your big file get the average of part throttle LTFTs. This should give you a much more accurate numbers.
Reply




All times are GMT -5. The time now is 07:46 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