Author Topic: Flat under low end Load  (Read 13131 times)

Offline Curly1

  • Sr. Member
  • ****
  • Posts: 261
    • View Profile
    • AireTex Compressors
  • Your Best Time: 7.95 @ 167 1/4 mile
  • Your Track: Texas Motorplex
  • Your Vehicle: 125" Altered
Re: Flat under low end Load
« Reply #15 on: May 18, 2015, 07:17:22 PM »
Now I do not know here but it seems to me if it was a bad chip it hurt it more on top RPM.  Do you know anyone who can loan you another ignition box to try? I know last year I had all kinds of problems car would run 5.09 one pass the next one 5.49 missing, popping and banging. Changed every thing out and kept testing the ignition box and it tested good. Finally changed it anyway and it ran like a top. Honestly I do not know what would make the ignition worse at low RPM and run good at higher RPM?
Rotor phasing may be an exception. Just do not know. Hope you find it quickly.

Offline tdietz

  • Newbie
  • *
  • Posts: 31
    • View Profile
    • Dietz Racing
  • Your Best Time: 7.88 - 1/4
  • Your Engine: SBC, 410 ci, Alcohol Injected
  • Your Track: Mid-Atlantic Region
  • Your Vehicle: Shack Engineering Front Engine Dragster
Re: Flat under low end Load
« Reply #16 on: May 19, 2015, 10:14:46 AM »
All, thanks again.  I did change out the ignition box, new cap and rotor went over all my grounds, and checked all my connections.  I did find a loose wire from my distributor to my box, but that wire I would think would either give me spark or no spark at all.  We will be racing this weekend.  I'll keep everyone up on if it worked or not.

Thanks again!

Offline Curly1

  • Sr. Member
  • ****
  • Posts: 261
    • View Profile
    • AireTex Compressors
  • Your Best Time: 7.95 @ 167 1/4 mile
  • Your Track: Texas Motorplex
  • Your Vehicle: 125" Altered
Re: Flat under low end Load
« Reply #17 on: May 22, 2015, 08:08:07 PM »
Good Luck with it and let us know how it works.  :)

Offline KeithDyer

  • Newbie
  • *
  • Posts: 24
    • View Profile
  • Your Track: Wichita Raceway Park - Wichita Falls
  • Your Vehicle: 225" FED
Re: Flat under low end Load
« Reply #18 on: May 27, 2015, 05:57:19 AM »
Call this a wild idea, but we had a customer car doing exactly this same thing.

Chased it a good bit, found the converter fins were standing up and killing the middle of the run, K

Offline tdietz

  • Newbie
  • *
  • Posts: 31
    • View Profile
    • Dietz Racing
  • Your Best Time: 7.88 - 1/4
  • Your Engine: SBC, 410 ci, Alcohol Injected
  • Your Track: Mid-Atlantic Region
  • Your Vehicle: Shack Engineering Front Engine Dragster
Re: Flat under low end Load
« Reply #19 on: May 27, 2015, 08:30:05 AM »
Thanks everyone for the help.  We ended up changing to the Digital 6AL box, and put a new cap and rotor in it.  And cleaned the problem right up.  No more issues....Thanks again for the help!

Offline H.G. Wells

  • Full Member
  • ***
  • Posts: 116
    • View Profile
  • Your Engine: Mild 383 SBC or 498 blown BBC
  • Your Track: Currently San Antonio, past Amarillo, Ardmore OK, Noble OK
  • Your Vehicle: late 60's FED of unknown origin
Re: Flat under low end Load
« Reply #20 on: May 27, 2015, 11:58:22 AM »
Thanks for the follow up, glad to know you got it handled.
Racecar spelled backwards is racecaR