Swap Regular 3.8 For A Sc 3.8? - TCCoA Forums
 
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post #1 of 10 (permalink) Old 02-18-2004, 12:59 AM Thread Starter
 
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Swap Regular 3.8 For A Sc 3.8?

What would i have to change in my car if i swapped my 3.8 for a supercoupe 3.8???
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post #2 of 10 (permalink) Old 02-18-2004, 10:18 AM
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From what I have read you have to change basically everything because the SC has stronger engine internals and heads. Plus computer, fuel pump, and I would guess rad and more.
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post #3 of 10 (permalink) Old 02-18-2004, 01:02 PM
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rear diff, half shafts, springs....list goes on and on. It would be much easier to sell your car and buy a nice used SC.

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post #4 of 10 (permalink) Old 02-18-2004, 10:22 PM
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Off the top of my head, there are two reasons I can think of as to why to swap a 3.8 N/A for a 3.8 SC

1) You have alot of attachment to your car and don't want to get rid of it.
2) You scored an awesome deal on a complete wrecked Super Coupe.

I fall under the first reason. Yes, I did it with mine - but I had help from some great people, and was able to work out a great deal. Here's a list of stuff that was changed on mine.

- Complete engine and transmission.. with the engine, need the radiator and maybe a few other misc things.
- The 8.8" rear end with half shafts and spindles (did rear brake swap in the process) and used driveshaft to match up with the rest of the parts taken.
- EEC along with some wiring harnesses from the engine bay (not sure which ones)
- Upgraded fuel pump to 255lph. If you don't upgrade to 255, atleast go with the stock SC pump (190 I believe)

Something else I recommend - have a nice place to do it (garage, shop, etc) and another car to drive in case you run into an unexpected problem. And most important - have access to the donor car - that way, you'll have everything you need right there and don't have to track down a particular harness or something.

-Andy "Melon"

1994 Thunderbird SC 3.8L Supercharged
1999 Crown Victoria P71 4.6
2000 Explorer 5.0
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post #5 of 10 (permalink) Old 02-19-2004, 01:25 AM
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The rear end, halfshafts, and brakes are more recommended items than absolutely necessary. However, it's certainly a good idea to swap them if you can.

-------------------

Steve

Owner, 1990 Thunderbird SC, white w/ gray cloth
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post #6 of 10 (permalink) Old 02-19-2004, 05:50 AM
 
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The SC motor also weighs a bit more... so its a good idea to get the springs. It *might* be cheaper to locate lowering springs for an SC.
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post #7 of 10 (permalink) Old 02-19-2004, 09:07 PM
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Quote:
Originally posted by S_Mazza
The rear end, halfshafts, and brakes are more recommended items than absolutely necessary. However, it's certainly a good idea to swap them if you can.
My reason for swapping the whole rear end is because of the amount of torque the SC has over the LX - going from 215 to 310. And while your swapping to the stronger halfshafts, might as well take the 8.8 rear end over the 7.5. Converting to rear-disc is completely optional - but if it's in the future mod list and the person had the whole SC as a donor readily accessible - why not swap?

I also agree on the springs/shocks. I'm getting Eibach's and Bilsteins (I think) in the spring - otherwise I would have swapped to SC springs. May not be cheaper, but you could get brand new springs instead of used.

-Andy "Melon"

1994 Thunderbird SC 3.8L Supercharged
1999 Crown Victoria P71 4.6
2000 Explorer 5.0
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post #8 of 10 (permalink) Old 02-19-2004, 09:17 PM
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Hello, I'm the guy that did a lot of the work on Andy's car. It's a real PITA, but a pretty cool swap when your done. A few things that come to mind.....

AC compressor, dryer, and lines have to be changed

Starting and Alt. wire harness.

Main harness from the EEC and ECC

All Engine harnesses

Vac lines are a lot different also

Some of the connectors under the hood and inside going to the dash have to be repinned also depending on what year car you are using. It is best to keep the two cars both from either '89-'90, '91-'93, or '94-'95. Trust me, things will be much easier! Some of the biggest differences include Distributor to DIS system, Belt driven fan to electric fan, and a lot of other things. You are also not going to want an NA tranny behind an SC engine, nor are you going to want the stock NA exhuast. They will do nothing but cause you more problems.

If you are going to use the SC 8.8 and halfshafts with disc brakes, you will also need to swap the rear E-brake cables. Also, the brake lines themselves are a little different.

We really didn't notice too much difference in front ride hieght on Andy's car with the stock springs. However, I'm sure it would handle much better with SC, V8, or lower springs due to the spring rates.

Thomas

1989 Cougar XR7 - 13.21 @ 102.29 -SOLD-
1993 Thunderbird SC -Awaiting Suspension-
1994 Mark VIII - 14.85 @ 93.95 -SOLD-
1996 Thunderbird Sport 15.57 @ 89.42 -Retired @ 258k-
1997 Thunderbird LX AED -SOLD-
1997 Thunderbird Sport 15.71 @ 86.89 -SOLD-
1997 Mark VIII LSC 12.97 @ 112.15 -SOLD-

Last edited by Thomas A; 02-19-2004 at 09:24 PM.
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post #9 of 10 (permalink) Old 02-19-2004, 11:37 PM
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Quote:
Originally posted by Melon

I fall under the first reason. Yes, I did it with mine - but I had help from some great people, and was able to work out a great deal.
I also hear you can run into problems with the car not starting after swapping. But this is a rare occurrance
-Thomas

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post #10 of 10 (permalink) Old 02-20-2004, 09:14 PM
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No, it started fine after the swap. It's when the alternator took a crap. So bite me

-Andy "Melon"

1994 Thunderbird SC 3.8L Supercharged
1999 Crown Victoria P71 4.6
2000 Explorer 5.0
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