C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Injector Constant vs BLM's

Thread Tools
 
Search this Thread
 
Old Jan 10, 2010 | 08:43 PM
  #1  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
Default Injector Constant vs BLM's

Can I manipulate the BLM's and/or the integrator by changing the FI constants ?? I have a heavily modded 87 and I'm using Tunerpro RT. For whatever reason , the laptop and BIN's arent getting along so I must tune with a PC . Because of the laptop issues I'm scanning with an Auto Xray for data . BLM's are presently in the 118-132 range at most cruise speeds.
Reply
Old Jan 11, 2010 | 02:47 PM
  #2  
JackDidley's Avatar
JackDidley
Race Director
20 Year Member
Active Streak: 30 Days
Liked
Loved
 
Joined: Sep 2003
Posts: 16,835
Likes: 337
From: Database Error Indiana
Default

If you raise the inj constant it will lean the the tune. If its rich everywhere then it will work. If its rich at cruise and lean at idle, or anywhere, those areas will be leaner.
Reply
Old Jan 12, 2010 | 05:04 PM
  #3  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
Default

How does it coincide with BLM's ? Under 128 rich or lean ? I used to know this but I think my brain is losing out to old-timers disease ....
Reply
Old Jan 12, 2010 | 07:31 PM
  #4  
JackDidley's Avatar
JackDidley
Race Director
20 Year Member
Active Streak: 30 Days
Liked
Loved
 
Joined: Sep 2003
Posts: 16,835
Likes: 337
From: Database Error Indiana
Default

Originally Posted by C409
How does it coincide with BLM's ? Under 128 rich or lean ? I used to know this but I think my brain is losing out to old-timers disease ....
Lower than 128 = rich. I have that old timers thing going too.
Reply
Old Jan 13, 2010 | 03:13 PM
  #5  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
Default

.........[b]THANKS[b]............
Reply
Old Jan 15, 2010 | 03:21 PM
  #6  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,136
Likes: 531
From: Glenbeulah Wi
Default

You want to set the injector constant at the actual size of the injectors and then change the BLM's by adjusting your MAS tables at the areas where the BLM's are incorrect.
Reply
Old Jan 15, 2010 | 07:08 PM
  #7  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
Default

........MAS tables ??? ....... Mass Airflow ? ....

OK ... So I read the post about tunercat flow rates and got the seminar .... Thanks , bjankuski

And who says Jack doesnt know Didley ?? ... Thanks guys .... more food for thought ...

Last edited by C409; Jan 16, 2010 at 04:42 PM.
Reply
Old Jan 24, 2010 | 05:22 PM
  #8  
bcollid's Avatar
bcollid
Advanced
 
Joined: Jun 2009
Posts: 90
Likes: 0
From: St. Louis Missouri
Default

So I am looking at the same situation and have a really basic question:
With EFI why tune to bring the BLM to 128?

Other than not wanting to rely on o2 sensors to determine the Air fuel mixture,
Why not just let the computer adjust the MAF cells with the BLM to achieve the desired air fuel mixture?
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-1

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-2

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-3

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-4

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
story-5

10 Things C8 Corvette Owners Hate (But Won't Tell You)

 Joe Kucinski
story-6

10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

 Brett Foote
story-7

Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

 Joe Kucinski
story-8

Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

 Michael S. Palmer
story-9

5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

 Joe Kucinski
Old Jan 26, 2010 | 01:31 PM
  #9  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,136
Likes: 531
From: Glenbeulah Wi
Default

Originally Posted by bcollid
So I am looking at the same situation and have a really basic question:
With EFI why tune to bring the BLM to 128?

Other than not wanting to rely on o2 sensors to determine the Air fuel mixture,
Why not just let the computer adjust the MAF cells with the BLM to achieve the desired air fuel mixture?
128 mean there is no correction which is the middle of the correction range. Usually the car will be a little more responsive when no correction is taking place. I try to get the BLM's to +- 5%.
Reply

Get notified of new replies

To Injector Constant vs BLM's





All times are GMT -4. The time now is 10:32 PM.

story-0
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-1
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-2
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-3
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-4
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-5
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-6
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-7
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE
story-8
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

Slideshow: Breaking down the 2027 Grand Sport, Grand Sport X, Stingray, and LS6 V8.

By Michael S. Palmer | 2026-03-26 13:48:45


VIEW MORE
story-9
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

Slideshow: 5 reasons bad drivers crash sports cars & 5 ways to avoid a costly shame!

By Joe Kucinski | 2026-03-25 16:32:55


VIEW MORE