Author Topic: 70 Challenger RT - EFI 6 Pack Conversion  (Read 39880 times)

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #315 on: February 05, 2018 - 11:25:10 am »
So, I returned to my challenger briefly as a buddy is here staying with me for a few days. The car starts horribly and I am thinking the EFI is either putting too much fuel in or not enough. I am trying to see how to set it up in the software but to be honest I am not exactly sure what I should be adjusting. As a reminder, I am running a Holley system with a dual sync distributor.

The deal is that it cranks for a long time, then will push back on the starter. I have to try and start it quite a few times until it will finally take; I have gone through the timing and I think that is good. I really believe it is a fuel issue at this point. We did figure out that I had 2 plug wires swapped which GREATLY improved running and power (duh  :banghead:).
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)




Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #316 on: March 11, 2018 - 12:27:19 pm »
Thought I would provide an update; I went out last week to start the car after having let it sit for about a month. After the last post, my buddy and I had played with the tuning a bit after correcting the plug wiring issue. When we stopped working on it, the car was running well but I was very fearful that after sitting it would be back to cranking and cranking before getting it to fire.

Well, got into the car, flipped the switch (to hear the fuel pump run), then cranked it. It turned over probably 4 or so times and then attempted to fire so I came off the key. Second attempt it fired right up, idled commensurate with the tune (about 1000 when cold). I let it run for awhile but before I turned it off I did notice that it wasnt running as rich as it had previously.

short story; it works awesome!!! I am very happy with it (for now).
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline Cudaragtop

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #317 on: April 02, 2018 - 12:44:01 pm »
 :2thumbs:  :ylsuper:
- Randy D.
1 of 88 1970 340 4-Speed 'Cuda Convertibles
69 Barracuda Fastback Project Album https://goo.gl/photos/XjsAsx4LDo7psimU8
----o00o--'(_)'--o00o----

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #318 on: April 02, 2018 - 01:21:42 pm »
Unfortunately the power steering seems to have decided to quit, it dumped its fluid under the car...  :pullinghair: I will get back to it one day...
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline YellowThumper

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #319 on: April 02, 2018 - 07:01:24 pm »
Unfortunately the power steering seems to have decided to quit, it dumped its fluid under the car...  :pullinghair: I will get back to it one day...
Take ps belt off and fire it off regularly.
Removing the warning labels one at a time.
Nature will take care of the rest.

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #320 on: April 02, 2018 - 07:07:36 pm »
In order to just run it occasionally or to protect the PS system?
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline 73440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #321 on: April 03, 2018 - 11:46:13 pm »
I installed 3 oz of AT-205 about 4 months ago and still no leaks. Pump would normally drain completely dry overnight.
http://atpautomotive.com/featured/re-seal

Currently have an oring soaking in the fluid and will check oring swelling .
67 440
72 413 / 727
73 Barracuda w/ 68 440
65 Plymouth Fury III , I sold ,was my Nana's car till 92 yo.
51 Ford F1 239 Flathead, flipped , new cab , stolen
59 BelAir 283 4 door original patina
01 Chevy van 406,105 miles
06 Crown Vic Police Interceptor
75 HD Ironhead converted to RH shift
73 HD Ironhead
82 HD Ironhead
74 Norton 850
80 HD Shovelhead
80 Husqvarna WR 390

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #322 on: April 04, 2018 - 12:13:52 am »
Thanks! I will give that a try. The box is fairly new (rebuilt by FF). I haven't looked where its leaking, could be a hose for all I know. That said I will get some ATP just to have even if I dont need it for this.
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #323 on: December 05, 2018 - 10:48:03 pm »
All - I returned to this thread to grab one of my pictures and noticed I never really finished the thread...

In reference to the leaking PS pump, turned out it was a bad fitting, Crash340 was visiting and recut the taper on the fitting and it sealed right up. He and I spent some time tuning the car a little more and I have to say it runs better than it ever has, more importantly it has vastly more power than it ever has, idles well and has great throttle response.

During one of the test drives during tuning, I had a car behind me and as I slowed with the brakes on, I noticed the car behind me wasn't. Eventually the car noticed I was slowing and slowed down until I turned off. When I came home I checked the car and sure enough, no brake lights.... Well after a few weeks I finally got out and investigated it and determined that when I built the car I didn't connect the brake light switch correctly. I got that fixed and BAM!! I got brake lights.

Presently the car works well, starts, idles and moves. I have it covered in my shop as I am continuing work on my Cuda. As far as I am concerned the car is done for now. I need to get the Cuda done so I can start something on else...  :money:
Current Mopar
70 Challenger RT 440-6, 73 Cuda (under const)
05 Durango, 99 Dakota, 01 Ram 4x4, 14 2500 4X4, 10 PCP Challenger RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR, 61 Jeep FC170
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)