Halltech MF103 impressions
Thread Starter
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Halltech MF103 impressions
These are my initial impressions after about 20-25 minutes of driving. Air temp as 88*F. Kind of cool considering relentless heat we've had.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
It was the first mod I did and I've been nothing but overly satisfied with it. The rubber gaskets on the beehive started to peel off and I sent Jim a PM about it-within 3 days, he had shipped me a new set of rubber gaskets in a new design that went on perfectly and haven't moved since I installed them.Their customer service is outstanding and their product looks like it should have come from the GM factory. The fit/finish is perfect and I get compliments on it nearly everytime I go to the track.
Racer
Joined: Sep 2011
Posts: 379
Likes: 27
From: Oklahoma
The rubber gaskets on the beehive started to peel off and I sent Jim a PM about it-within 3 days, he had shipped me a new set of rubber gaskets in a new design that went on perfectly and haven't moved since I installed them.
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
Ya, the original design had them glued on--the new design fits over the edge of the beehive nice and snug and looks even better.
Instructor
Joined: May 2011
Posts: 205
Likes: 10
From: Godfrey Illinois
Heh heh.......a premier product that looks GM stock and performs like a champ. I am really glad I took the leap and invested in this system for my ride!!
Race Director
Joined: Dec 2006
Posts: 12,396
Likes: 2,912
From: Fort Worth, Texas
These are my initial impressions after about 20-25 minutes of driving. Air temp as 88*F. Kind of cool considering relentless heat we've had.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
Instructor
Joined: May 2011
Posts: 205
Likes: 10
From: Godfrey Illinois
Wouldn't want to damage your sweet ride running too lean and makin' pre detonation.....get 'er checked soon!
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Le Mans Master
Joined: Nov 2004
Posts: 5,886
Likes: 371
From: Cape Coral FL
These are my initial impressions after about 20-25 minutes of driving. Air temp as 88*F. Kind of cool considering relentless heat we've had.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
IT WORKS!
The car started instantly and idled perfectly. I ran several WOT runs, usually 2nd gear about 3500 rpm and I could feel it pulling harder. I'd say much harder but my *** dyno hasn't been calibrated, but it is definitely faster, particularly starting in the mid range. I did notice after each upshift I'd hear a very brief "ping" or rattle. I'm pretty sure this is because of the improved efficiency?? (I seem to recall back in the day you'd time a car at that point and set it). Also, the car feels "cleaner", a hair more snappy in light throttle, and just feels good, like the car lost a few hundred pounds of weight.
The MAF forward design is a winner.
I was able to reuse my 6 point torx, and the tabs that hold down the old airbridge also can hold down the bee hive. They're easier to remove later if you want to get to the filter. Just pull up the center pin and pull the tab out.
It's a Z06 using the stock naca duct for air. I don't know if it'd be worth it to try and open up some other holes for more air.
No surging either. I'll put more miles on it the next few days to let it adjust more.
Good work, Jim Hall.
Thread Starter
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
I'm beginning to think it's a quick whistle sound when I let off to shift.
Thread Starter
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Instructor
Joined: May 2011
Posts: 205
Likes: 10
From: Godfrey Illinois
