LOST 10mph AND ABOUT 6 TENTHS

[monte8616]

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

[MR DERBY CITY]

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 ......

[monte8616]

Originally Posted by MR DERBY CITY

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 ......

What else do you know about the magnetized thing? Very interesting...

[Jeff Stout]

Originally Posted by monte8616

What else do you know about the magnetized thing? Very interesting...

I know a local racer that determined the spun bearings came from arcing on crank to bearing clearance and made pit mark's on journal. He had connected ground to block and welded on frame.

[MR DERBY CITY]

Originally Posted by monte8616

What else do you know about the magnetized thing? Very interesting...

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....

[monte8616]

Originally Posted by MR DERBY CITY

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....

I don’t think anything was in the car when we welded but still a good thought - thank you! Nothing is a bad idea at this point!

[Greg Hill]

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.

[HP HUNTER]

Originally Posted by monte8616

What else do you know about the magnetized thing? Very interesting...

Make sure the dist pickup wire is away from the other wires, I use a shielded pick up wire.

[Bill Bogues]

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.

[4543]

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.