1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

s4 n/a into a gsl-se

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Old 10-21-06, 09:25 PM
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spunout

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s4 n/a into a gsl-se

What are the modifications reqiured and how easty is the swap? Just would like some feedback from someone who has done this. Thanks
Old 10-21-06, 10:03 PM
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i think a gsl se front cover and well... run the s3 electrinics as the ecu needs an rpm signal. so just use the intake manifolds.
Old 10-21-06, 10:57 PM
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The actual install is easy......
GSL-SE oilpan and GSL-SE front cover,and your mounted.

To run the S4 ECU and dual stage EFI,youll have to install the big passenger side EFI harness and then fab up the smaller left side harness to power the CAS,coils and fuel pump.The FC injection is more advanced and quicker than the GSL-SE injection.Its a nice system,but not a direct swap.I have done both the S4, and then S5 engine swaps on my car (both turbo) and I can say from experience that the newer you get,the better the EFI control systems get.

Do a search for "TII swap" questions......its been asked and answered a million times,over and over again.The wiring and work involved is exactly the same no matter if you do an N/A or TII engine swap.They are nearly identical systems,right down to the wire colors and control components.The main differences for FC engines,is between the S4(86-88) and S5(89-92) stuff.
Old 10-22-06, 10:43 AM
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If you have the ecu it should be just, coils (as 2nd gen coils have a little more juice), cas, oil pan and timming cover I think... If you don't have the ecu you will need a couple more things...
Old 10-22-06, 12:03 PM
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Originally Posted by steve84GS TII
The actual install is easy......
GSL-SE oilpan and GSL-SE front cover,and your mounted.

To run the S4 ECU and dual stage EFI,youll have to install the big passenger side EFI harness and then fab up the smaller left side harness to power the CAS,coils and fuel pump.The FC injection is more advanced and quicker than the GSL-SE injection.Its a nice system,but not a direct swap.I have done both the S4, and then S5 engine swaps on my car (both turbo) and I can say from experience that the newer you get,the better the EFI control systems get.

Do a search for "TII swap" questions......its been asked and answered a million times,over and over again.The wiring and work involved is exactly the same no matter if you do an N/A or TII engine swap.They are nearly identical systems,right down to the wire colors and control components.The main differences for FC engines,is between the S4(86-88) and S5(89-92) stuff.
This guy has the right idea^. If you're talking about just the short block, there is no advantage over the GSLSE...you'll actually lose torque do to the GSLSE having the heaviest rotors. If you know what you're doing then I do suggest the ECU and wiring harness swap. The direct fire igniton is great. If not then I suggest using JUST the S4 intake manifolds and using the GSLSE injection. U can still use the Leading 2nd gen ignition coil-U'll just have to get MSD to run it. There should be a thread on how to convert just the manifold somewhere or you can just PM me. I did not do the whole ECU swap. I wish I did since I could use the Apexi Power FD upgraded and fully tunable ECU....
Old 10-22-06, 01:42 PM
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okay well heres the deal.........i have a very strong running s4 n/a motor that i want to put into a gsl-se. I was just curious on what mods i would have to do to complete the swap. So far i have the general idea of the oil pan and front cover. I do have the ecu from the s4 N/A and all the intake etc. The whole longblock.

What i need to know is what to take from the old gsl-se motor to the new s4 13b.

Thank you for all of the responses so far.
Old 10-22-06, 03:04 PM
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If you have all the S4 EFI control gear and sensors to go with the block,manifolds and ECU.....then the only parts you need from the GSL-SE engine are the oilpan,oil pickup tube and front cover.Other than those 3 SE parts,the entire S4 engine will be used when doing an S4 swap.The only one-off custom part you will have to make will be the left side wiring harness,bascially about 15 wires to run the CAS,coils,fuel pump and ECU power relay.Reason you have to make that harness from scratch is because on the S4,that engine harness is integral to the underdash harness,which is huge and about a mile long.All you need is a simple little harness big enough to power the ECU and a few engine components.
The S4 has more peak power and torque than the GSL-SE,although it doesnt make its grunt quite as low in the revs like the SE.Overall,its a better engine.....
Old 10-22-06, 03:17 PM
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I have this exact setup. Steve84gsTII is right but for now you can do what I did untill you get time to build the harness.

Under my hood:

Stock GSLSE-
Harness
ECU
Front cover
Oil Pan
Eshaft (use it when motor was built)
dizzy
coils
Fuel Pump
and injectors
AFM


Stock S4 parts-
housings
rotors
flywheel
front counterweight
upper intake
lower intake
TB
Using primary injector holes (blocked 2nds)


Where are you located? look at my garage pics and you will see my motor, or i can send you pics tomorrow when I get home.
Old 10-27-06, 07:53 PM
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Chad Carson

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Originally Posted by steve84GS TII
The actual install is easy......
GSL-SE oilpan and GSL-SE front cover,and your mounted.

To run the S4 ECU and dual stage EFI,youll have to install the big passenger side EFI harness and then fab up the smaller left side harness to power the CAS,coils and fuel pump.The FC injection is more advanced and quicker than the GSL-SE injection.Its a nice system,but not a direct swap.I have done both the S4, and then S5 engine swaps on my car (both turbo) and I can say from experience that the newer you get,the better the EFI control systems get.

Do a search for "TII swap" questions......its been asked and answered a million times,over and over again.The wiring and work involved is exactly the same no matter if you do an N/A or TII engine swap.They are nearly identical systems,right down to the wire colors and control components.The main differences for FC engines,is between the S4(86-88) and S5(89-92) stuff.


Steve, have you done this into a 79 SA? Looking at running a S5 motor, passengerside harness and ECU. Don't know how I can trigger the ECu since the SA has no ECU already. Any ideas? Other than going stand alone.
Check pms

Last edited by Fire85GSLSE; 10-27-06 at 08:06 PM.
Old 10-27-06, 10:13 PM
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Wiring and EFI control work are all the same,regardless of what kind of car you put the FC engine into.

Remember,the way I did it (which is best duplicating the factory setup)....the engine control harness' (2), power to the ECU and everything relating to the FC engine is totally independant of the car's wiring.No splicing,no cutting,no hacking.
With the exception of the main FC fuseblock to the battery/alternator, and 1 little wire from the ignition switch to the FC main ECU relay,to turn on the computor when the key is turned.

This means that I could put my engine on a stand,hook the FC fuseblock to a battery and the 1 ignition switch wire to a button.....and the engine would start and run outside of the car.It wouldnt matter if it was in an FB,SA,a truck,a boat or an airplane........it would still be the exact same setup and the exact same amount of work to swap it in.
Old 10-28-06, 06:26 AM
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Originally Posted by steve84GS TII
Wiring and EFI control work are all the same,regardless of what kind of car you put the FC engine into.

Remember,the way I did it (which is best duplicating the factory setup)....the engine control harness' (2), power to the ECU and everything relating to the FC engine is totally independant of the car's wiring.No splicing,no cutting,no hacking.
With the exception of the main FC fuseblock to the battery/alternator, and 1 little wire from the ignition switch to the FC main ECU relay,to turn on the computor when the key is turned.

This means that I could put my engine on a stand,hook the FC fuseblock to a battery and the 1 ignition switch wire to a button.....and the engine would start and run outside of the car.It wouldnt matter if it was in an FB,SA,a truck,a boat or an airplane........it would still be the exact same setup and the exact same amount of work to swap it in.

Understandable, I now need to get a driver side harness for a S5 or look to see if the S4 driver side harness is the same.
The good thing about doing the S5 into my SA will be two things. The S5 is more plug and play and having a 91TII I can use it to look at. The bad is having the frontcover made to hold the OMP of the S5 motor.
Thanks
Old 10-28-06, 11:05 PM
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The S4 and S5 have different gang plugs that go into the ECU.

If you cant get a hold of a complete S5 underdash harness,all you really need is the ECU gang plug and the plugs that go into the 2 coils,fuel pump resister relay,and main relay.The wiring between the plugs can be made from any old wiring you have,just cut,solder and shrink tube.There are only 8 wires that are necessary for the engine to run,and another 4 that should be hooked up for correct smog control and trouble code extraction.The remaining 10 wires on the left side gang plug can be removed since they power items that are not used on the 1st gen.
If your interested,I have a depinned and labled S5 gang plug for the left side harness.All the leads are marked for function and location.All youd have to do is mount and wire up the FC underhood fuse block,main relay,coils,fuel pump resister and the circuit opening relay for the ECU.
Old 10-28-06, 11:10 PM
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wow, I would be interested in that harness
Old 10-29-06, 03:18 PM
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Chad Carson

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Originally Posted by steve84GS TII
I have a depinned and labled S5 gang plug for the left side harness.All the leads are marked for function and location.All youd have to do is mount and wire up the FC underhood fuse block,main relay,coils,fuel pump resister and the circuit opening relay for the ECU.

Steve, shoot me a price. Want to get it all together so once the car is painted I can start the building.
Chad
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