70 Challenger RT - EFI 6 Pack Conversion

Author Topic: 70 Challenger RT - EFI 6 Pack Conversion  (Read 66183 times)

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #225 on: December 03, 2016 - 11:46:47 PM »
Thanks, it has been a bit long but enjoyable overall, however it isnt completely done yet. Still have a few small things to finish up and drive it. Started the day by installing the MAT sensor into the air cleaner, was a little hesitant drilling a hole in a perfect OEM air cleaner base, but had to do it. Then I got a little side tracked by trying to make a ring to go around the horn button which had a 1/2" gap which I didnt like. Since I am not capable of machining something myself, I went with sheetmetal and polished it. Was a little tricky but not super hard. I am happy with the results, far better than what it was.

After all that, I moved on to routing the USB cable for the laptop and adding an extension so I can still adjust the parameters and tune the car. I am not sure it liked the extension all that much but it did work overall. It would lose connection with the ECU once in awhile breifly but would come back.

I then went to put the interior back in and decided to add some Hushmat to the space under the backseat since I had not previously. Tomorrow, I should be able to get all of the rest of the interior back in, if the weather clears up I might drive it some.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)




Offline usraptr

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #226 on: December 03, 2016 - 11:53:02 PM »
That wheel spacer looks great!   :2thumbs:  You'd never know that it hadn't been fabricated! 
1970 Plymouth 'Cuda.  Matching numbers 440 U Code, 4 speed pistol grip, Rallye dash, AM 8 Track, Shaker hood, 15 inch rallye wheels, Dana 60 4.10, Super Track Pak.  One of 134 - 440 "U" coupes codes built in 1970 and one of 100 - 440 Super Track Paks built in 1970.

Restoration pictures at:  http://spanks4thememory.smugmug.com/Cars/70-Cuda/7240639_M24oi#465274575_2MBqW
(Edited 8-1-17)

"usraptr" = United States raptor - bird of prey = United States Bald Eagle.  FYI, somebody else thought of it first so I had to drop the "O" in raptor.

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #227 on: December 04, 2016 - 12:00:50 AM »
Yeah it came out nice, there is one spot on the top that bubbled a little when I welded it but it is minor overall. Much nicer than the 1/2" gap  :bigsmile: I even put a small "U" cut in the bottom so you can pop off the cap if needed. The metal was 22 gauge galvenized sheet metal and it polished up pretty well. I was thinking that if it didnt I would paint it, but foruntately it did.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
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 #228 on: December 04, 2016 - 07:04:43 PM »
Finally got the car put back together and was able to drive it. I drove the car twice locally, didn’t go very far because I need to adjust the kick down cable to get it to shift into 3rd, however I did drive it until it was warm (T-stat open) and I did vary the RPM/speed somewhat. A few observations that perhaps you can lend some insight on;

1.   The car seemed to surge during idle
2.   It seems like most of the time I try to start it, it will crank a few times and then back fire through the intake causing me to release the key. Then the next time I crank it, it will start.
3.   The second time I drove the car, as I accelerated trying to get the car to shift, it died suddenly. Complete shutdown of the system. I coasted to a stop, then attempted to restart it, it took a few tries but then started. I drove home and when I came to a stop in my driveway it died again, this time it took more than a few tries to get it started, after which it died about 2 minutes later as I tried to enter my shop.

The car had about ¾ tank of premium in it so I do not think fuel supply is an issue. I do however think I am still have some type of timing problem.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline usraptr

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #229 on: December 05, 2016 - 11:28:25 AM »
While I'm no expert on EFI systems or tri-power, if it's backfiring through the carb I would agree it's some kind of timing issue.  Good luck on sorting it out.  :2thumbs:
1970 Plymouth 'Cuda.  Matching numbers 440 U Code, 4 speed pistol grip, Rallye dash, AM 8 Track, Shaker hood, 15 inch rallye wheels, Dana 60 4.10, Super Track Pak.  One of 134 - 440 "U" coupes codes built in 1970 and one of 100 - 440 Super Track Paks built in 1970.

Restoration pictures at:  http://spanks4thememory.smugmug.com/Cars/70-Cuda/7240639_M24oi#465274575_2MBqW
(Edited 8-1-17)

"usraptr" = United States raptor - bird of prey = United States Bald Eagle.  FYI, somebody else thought of it first so I had to drop the "O" in raptor.

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #230 on: December 05, 2016 - 12:52:27 PM »
thanks, in my head I am thinking the timing is retarded or being retarded through the software but I am trying to figure it out.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
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 #231 on: December 07, 2016 - 07:12:22 PM »
I was able to work on the car a little despite the cold weather (30 deg F); thankfully I have a space heater... Every year I swear I am going to put propane heat into the shop and every year I don't..

I discovered that I am have an electrical connection issue. I am feeding the "switched" power from the blue and brown wires that used to go the ballast resistor which would work, however the bulk head connection is erratic meaning the plug vibrates/moves and the connector loses connection and I lose power to all of the switched side which includes my fuel pump and then the car dies.

I have to either figure out how to increase the connection and make it reliable or find a way to rewire the distributor block to something else. Since the bulk head connector is also connected to the voltage regulator, I am sure I need to get this sorted for long term reliability. I have come to really dislike the bulk head connector overall. I am sure when they were new, it was all good but now 36 years later, not so much.

I am not sure if it is not "clipping" in or what; you can push on it and it does move but I am not sure if I am pushing the whole thing or what.

Issues never end...
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
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 #232 on: December 10, 2016 - 12:08:50 AM »
Had a chance to work on the car a little, I think the connector I am relying on is corroded and making sporadic contact. I pulled the plug off the engine compartment side and tested the connections, the one I need showed no power initially (switch on), I then tried cranking it and it "blinked" a little and then had power after cranking (as it should). I am probably not explaining this well, but the bottom line is that it should have power with the switch on and cranking. The only way to fix it is to dismount the fuse block and try and get behind it to clean up the terminal or find the feed line and splice into it.

While I was playing with all of this, I did some rearranging to get the car to start and connected to a good terminal, the car ran very well. Idled nice, rev'd quickly, etc. Therefore I am have arrived at the opinion that some of my running issues were/are power related. Problem became that I could not turn the car off, so I had to pull the coil wire, I can tell you that the MSD really kicks out the power...  :bigsmile: Looked my TIG welder going off...
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline 74BlueFish

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #233 on: December 10, 2016 - 08:04:31 AM »
I think splicing those wires so they don't go thru the connector is the best thing in the long run.  Maybe with a push on type connector in the engine compartment where it's easy to get to.
Dan

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #234 on: December 10, 2016 - 02:17:03 PM »
I am thinking the same thing, I just need to find the wire I need under the dash.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline usraptr

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #235 on: December 19, 2016 - 08:02:13 PM »
Glad to hear you identified the problem!   :ylsuper:
1970 Plymouth 'Cuda.  Matching numbers 440 U Code, 4 speed pistol grip, Rallye dash, AM 8 Track, Shaker hood, 15 inch rallye wheels, Dana 60 4.10, Super Track Pak.  One of 134 - 440 "U" coupes codes built in 1970 and one of 100 - 440 Super Track Paks built in 1970.

Restoration pictures at:  http://spanks4thememory.smugmug.com/Cars/70-Cuda/7240639_M24oi#465274575_2MBqW
(Edited 8-1-17)

"usraptr" = United States raptor - bird of prey = United States Bald Eagle.  FYI, somebody else thought of it first so I had to drop the "O" in raptor.

Offline 70chall440

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #236 on: December 19, 2016 - 11:41:15 PM »
Now I just have to fix it... I ordered and just received a new engine harness block from 521 restorations. The package says 71-74 but it sure looks like the one in my 70. Guess we will see.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
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 #237 on: December 20, 2016 - 12:02:15 AM »
Wow! That turned out nice.  :cheers:  :clapping:

- 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 #238 on: December 20, 2016 - 12:04:33 AM »
Thanks, I am pretty happy with it.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline marc70challenger

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Re: 70 Challenger RT - EFI 6 Pack Conversion
« Reply #239 on: December 20, 2016 - 03:41:13 PM »
Great work!!!  Where do you live.  :roflsmiley:
1970 Challenger 340 Performance Package
1965 Barracuda - "The Pumpkin"  http://www.cuda-challenger.com/cc/index.php?topic=116471.0