PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

twin MAF'S

Thread Tools
 
Search this Thread
 
Old 09-07-2007 | 08:31 PM
  #1  
abbaskhan's Avatar
Thread Starter
Launching!
 
Joined: May 2004
Posts: 266
Likes: 0
Default twin MAF'S

might seems like a strange question but......is it possible to run two mafs on the ls2 if so how???
Old 09-07-2007 | 08:33 PM
  #2  
00'WS6Rocket's Avatar
TECH Resident

iTrader: (3)
 
Joined: Nov 2004
Posts: 939
Likes: 0
From: Fort Worth, Texas
Default

I've never heard of that? What would be the purpose?
Old 09-07-2007 | 08:51 PM
  #3  
abbaskhan's Avatar
Thread Starter
Launching!
 
Joined: May 2004
Posts: 266
Likes: 0
Default

well i see all these twin throttle body v8s running around wondering if we can do the same
Old 09-07-2007 | 08:58 PM
  #4  
1badjimmy's Avatar
Staging Lane
iTrader: (4)
 
Joined: Apr 2006
Posts: 95
Likes: 0
From: outside San Antonio
Default

Why not run in speed density and omit the MAF? Or can the LS2 and LS7 not be programmed to run in speed density?
Old 09-07-2007 | 09:08 PM
  #5  
horist's Avatar
TECH Senior Member

 
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Default

I know on LS1s it's possible (Harlan runs a dual MAF for his boosted application) However, unless you're going lots of boost it's probably not worth the hastle (especially now that there are custom 2/3 bar operating systems out there)
Old 09-07-2007 | 09:24 PM
  #6  
squealingtires's Avatar
TECH Regular
iTrader: (14)
 
Joined: Oct 2005
Posts: 437
Likes: 0
From: Dayton, Ohio
Default

I think a small integrated circuit (which type ???) would handle it. It would need to be capable of recieving 2 signal inputs and have a programmable single output. Then a MAF calibration adjustment in the PCM would polish it off. (There might be more to consider)
Old 09-07-2007 | 09:49 PM
  #7  
LS1curious's Avatar
TECH Enthusiast
 
Joined: May 2007
Posts: 538
Likes: 0
Default

I think Harlan might have had resources that allowed him to do that.


Originally Posted by horist
I know on LS1s it's possible (Harlan runs a dual MAF for his boosted application) However, unless you're going lots of boost it's probably not worth the hastle (especially now that there are custom 2/3 bar operating systems out there)
Old 09-07-2007 | 09:59 PM
  #8  
abbaskhan's Avatar
Thread Starter
Launching!
 
Joined: May 2004
Posts: 266
Likes: 0
Default

thanks guys more input would be great
im planning on twin turbos for my vette so its something id kinda like to do for the wow factor if possible
Old 09-10-2007 | 05:39 AM
  #9  
Rob's Avatar
Rob
TECH Fanatic
iTrader: (6)
 
Joined: Nov 2001
Posts: 1,326
Likes: 6
From: Diamondhead, MS
Default

That orange Ram Air GTO(Woodward) that was made by GM had twin MAF's. They said it was a nightmare to tune.
Old 09-10-2007 | 02:48 PM
  #10  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

Assuming there is no airflow limit, floating point OS, there is no need for twin MAFs. You could build the sender into any tube and as long as you position it ok and calibrate it to the characteristics of that intake you are good to go.

You can't just add the signals together. It would require a whole new OS and too many engineering hours.
Old 09-10-2007 | 08:22 PM
  #11  
RE AND CHERYL's Avatar
TECH Fanatic
iTrader: (31)
 
Joined: Apr 2007
Posts: 1,207
Likes: 0
From: Dover DE
Default

An SD tune would be way easier to do.

Re'
Old 09-11-2007 | 08:20 AM
  #12  
moehorsepower's Avatar
TECH Addict
iTrader: (3)
 
Joined: Feb 2003
Posts: 2,334
Likes: 17
From: Texas
Default Twin MAF's

Back in 97 we tried the idea on dual MAFS on my Boosted LT1, there was no signal problem, the problem was that the MAFs were not seeing an ideal split of 50/50 on the intake air flow, one would register like 60% and the other at 40% and of course this would differ on every pull. It was just an idea at the time, I just ended up tuning with my stock maf and all was fine...
Old 09-11-2007 | 02:49 PM
  #13  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

Originally Posted by moehorsepower
Back in 97 we tried the idea on dual MAFS on my Boosted LT1, there was no signal problem, the problem was that the MAFs were not seeing an ideal split of 50/50 on the intake air flow, one would register like 60% and the other at 40% and of course this would differ on every pull. It was just an idea at the time, I just ended up tuning with my stock maf and all was fine...
That is very interesting info! How did you connect them to the PCM? Any other results?

Funny how stuff works, huh?
Old 09-13-2007 | 04:23 PM
  #14  
moehorsepower's Avatar
TECH Addict
iTrader: (3)
 
Joined: Feb 2003
Posts: 2,334
Likes: 17
From: Texas
Default twin mafs

I really do not remember how the electronics were hooked up. I actually did not do the electrical part just the mechanical of fabricating the intake tube for the dual mafs..This was quite a while back..




All times are GMT -5. The time now is 03:04 PM.