|
|
12-05-2020, 07:12 PM | #1 |
Junior Member
Join Date: Oct 2010
Posts: 18
Likes: 39
Liked 14 Times in 6 Posts
|
LOST 10mph AND ABOUT 6 TENTHS
So, I have gremlins in my car... the motor is fine on the dyno, the MSD and coil from the car are fine on the dyno... the trans is fine - the converter has been sent out and is fine... has anyone had any issues with a Racepak causing an issue like this?? It’s really the only change we made over the winter... car made a few good passes and then lost the time and speed... it’s quite a discouraging problem - if anyone has any ideas, please help!! Thanks!
Joey Cole - GT/DA - 454 BBC - Turbo 350 |
12-05-2020, 07:37 PM | #2 |
VIP Member
Join Date: Feb 2014
Location: Derby City, USA
Posts: 3,457
Likes: 992
Liked 7,169 Times in 1,387 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
Check fuel system, , the 30 second jug test is a good start, replace the battery/batteries....Have you done any welding close to the car ? .....Some racers have reported that their car became MAGNETIZED and they lost plenty of ET and MPH ......3 ideas to PONDER ......
|
Liked |
12-05-2020, 08:52 PM | #3 | |
Junior Member
Join Date: Oct 2010
Posts: 18
Likes: 39
Liked 14 Times in 6 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
Quote:
|
|
12-05-2020, 09:00 PM | #4 |
VIP Member
Join Date: Dec 2001
Location: phoenix
Posts: 1,455
Likes: 58
Liked 691 Times in 274 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
|
Liked |
12-05-2020, 11:48 PM | #5 |
VIP Member
Join Date: Feb 2014
Location: Derby City, USA
Posts: 3,457
Likes: 992
Liked 7,169 Times in 1,387 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
When I weld on my car I ALWAYS disconnect my MSD and all grounds to the engine block. Jerry Doughty from Louisiana was the racer that had to DE MAGNETIZE his stocker. Perhaps him or his brothers could jump in here on this thread. I remember it involved a compass and a cell phone ...his stocker had the same symptoms as your car....
|
Liked |
12-06-2020, 10:09 AM | #6 | |
Junior Member
Join Date: Oct 2010
Posts: 18
Likes: 39
Liked 14 Times in 6 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
Quote:
|
|
12-06-2020, 11:01 AM | #7 |
VIP Member
Join Date: May 2006
Location: Louisville , KY
Posts: 1,995
Likes: 67
Liked 270 Times in 68 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
Is this a Quadrajet motor or Holley? If it’s a q-jet I would bet money it’s in the fuel system.
It’s critical to have enough fuel volume and a q-jet on a 454 SS motor would really stress your fuel system. A good pump like a Magnafuel, a #10 line from the cell to the regulator, appropriate return line, and a # 8 line from the regulator to the carb would ne required. Even if it’s a Holley I would do the same thing.
__________________
Greg Hill 4171 STK |
12-06-2020, 07:19 PM | #8 |
Senior Member
Join Date: Feb 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 636
Likes: 76
Liked 306 Times in 114 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
|
12-06-2020, 08:33 PM | #9 |
Member
Join Date: Apr 2005
Location: Bethany La.
Posts: 320
Likes: 84
Liked 171 Times in 53 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
our car slowed down over a couple of races. Turns out it was the rubber brake line to the rearend swapped out line at track and picked up instant 5 tenths.
__________________
Bill Bogues 4696 STK |
Liked |
12-06-2020, 10:03 PM | #10 |
Senior Member
Join Date: Apr 2005
Location: Texas
Posts: 615
Likes: 52
Liked 564 Times in 125 Posts
|
Re: LOST 10mph AND ABOUT 6 TENTHS
Can you post a net slip from both a fast and slow run? Can you post the race pack info from a good run with a bad one overlaid on it? What sensors do you have on the trace pack? Other thing would be send the race pack files from a good run and a slow one to someone you know who has been using a race pack for a while. Might pick up something.
|
|
|