Ok I figured with all of the b.s non searched threads that happen EVERYDAY, then I could start one BECAUSE MY QUESTIONS ARE REAL QUESTIONS..


The story goes..

I have a S4 n/a 4 lug (86' to be exact)

I am getting a S5 T2 engine from a guy and after I buy the intakes and manifold and turbo and intercooler I plan to mount it in..

Here is my questions..

1. I know the S5 is an FC engine however the 86 never came with a turbo engine option. will the s5 engine bolt in the stock location or will I need to fab anything up?


2. What all do I need to do the sap (drivetrain) engine, trans, driveshaft and diff? or can I use a n/a driveshaft and diff?

3. Will the n/a trans bolt to the turbo engine (s4 n/a trans s5 engine) if so what is the gain in using the s5 T2 trans over the n/a trans.

4. What is the gear ratio in the s4 n/a diff and the s5 T2 diff and do I HAVE to swap.

5. When I get the wire harness and ECU will I need to swap any other interior parts to make this swap work (cluster, warning light computer etc)?

6. If I do the T2 diff do I have to swaap the axles and hubs or can I bolt the T2 diff to the n/a s4 axles?

7. if I have to swap trannies will the T2 trans fit directly in the stock spot under the tranny tunnel and no modification needed to make the shifter go in the stock location?

8. What fuel pump is recomended I know I need to swap out pumps but do I need to swap tanks, senders, or anything else?

9. I have never done a rotary engien pull etc but I have done many datsun pulls, domestic engien pulls etc what is the toughness rating of this pull (1-10, 10 being hardest)

10. Any recomendations for me to get or have done before I put the engien in and bolt on the stock turbo, manifold, intake etc?


THX guys I know this has all been copvered but atleast these are good solid questions and not the norm "how can I make my car faster" CRAP!

 

I'm keeping my eye on this thread.!.
not to hijack but I'm doing a turbo swap too. Only thing is I'm using an s4 motor on an s4 body.
I really just need to know about the engine harness.

Sorry.
,Keith

 

1. yes

2. you need tranny starter, DS, diff. and all the other crap that can be found via searching. and yes you can use the NA DS and DIFF (see #3)

3. it will bolt on but it's much weaker and will not hold up with more than 250-270 hp.

4. same questions that could have been found via search. you don't have to swap them

5-10. man, your REAL questions have received REAL answers in the past. You're wasting our time. go search and you'll find EVERYTHING YOU NEED.

Having us write this **** over and over again is a waste.

if you go with an S5 ECU you need to rewire the body electrical system. Hope you have both the S4 and S5 FSMs.

 

ok I did some searching and I read that you can bolt the turbo engine up to the stock n/a drivetrain its just the drivetrain wont hold alot of power (no biggiey et)

but can I bolt a S5 T2 engine to a S4 n/a tranny?

and if so does this mean I need a flywheel for S4 n/a
and a counterweight for a S5 automatic (does the counterweight metter between T2 and n/a autos?

 

ok it appears my plan will be to do the turbo swap into my n/a drivetrain.

I know now I will need a S5 auto counter weight, s5 lightweight flywheel, s4 n/a heavy pressure clutch. (lots of prayers) and in order to use the s4 wire harness I need to use all of the s4 sensors...

so I guess this means I may just take the s4 intake and turbo/manifold this guy has with this engine so I can drop it right in.

I will still need a s4 T2 ecu correct?
Also an s4 T2 boost sensor?
I will have to change or add 3 wires correct?


any other info would be appreciated

 

aaron cake is just shy of 400WHP on a N/A drivetrain

 

really see I did a search and I read the n/a drive train is only good for 260ish hp. this is why sometimes it is better to ask I got two different build threads on doing what I plan to do and both said the stock n/a drivetrain wont hold much over 260ish

 

i dont think its a LSD though.

 

mine is not a LSD either

 

For the flywheel, you will need the s5 counterweight, and to use your NA transmission a NA lightweight flywheel and NA performance clutch set.

Since the engine is a S5, and you have a S4, the easiest way to put in in would be to source a s4 turbo front cover/OMP, TPS, engine harness, injectors, ecu and boost sensor, knock sensor, and knock box.

Now, you could use your original NA harness, but you will need to lengthen some wires to make the twin scroll work. Not sure of mods needed for knock sensor.

Your gauges cluster will still work, but has no boost gauge. This is not a problem, just get an aftermarket gauge

As far as the fuel pump, I would just get a walbro and be done with it.

And for the engine removal, it is very easy, just take your time. Follow the instructions on RotaryRessurection's site:

Super good instructions with pictures

Vince

 

You open by saying that your thread will have good questions. Then it turns out that you lied and should have searched... just how dense are you?

 

Zomg! Search ****'s Attaaaaaaaakkkkkkk!

 

I wont be using the omp. do I plan to just block off the omp and premix.

so I guess the front cover should'nt be a big deal..

I never said they were good questions I said they were real questions.. searching will give u most the info but alot of specifics I could use strait forward answers.. not only that but I dont recept info as good by reading it.. I like to be told it not searching and reading through stuff..

 

From just finishing this myself:

1. Yes, the engine bolts right in

2. I personally had the TII tranny and had a driveshaft made to mate to the N/A rear end. You live in the USA so just get the Mazdatrix one if you are short on cash. If not, get the whole TII rear end.

3. Turbo tranny is much stronger. I believe this has already been answered

4. I didn't and it works fine. Not sure of the exact ratio, but 5th gear at 120km/h is about 3300 RPM's.

5. Nope. All the interior stuff works as long as you are using your stock S4 N/A wiring harness and ECU.

6. You need the TII Axles/Halfshafts

7. I have heard that there are some modifications needed, but mine bolted right up with no custom anything needed.

8. If you are just running stock boost, a TII FP would work, but in retro-spect I wish I would've just payed the extra $40 and got the Walbro or atleast an FD one. Go with the Walbro and the N/A's don't need the fuel pump rewired!

9. After stripping it down to the shortblock, my dad, a friend and myself lifted it by wrapping a chain around a long 2x6. I would not recommend this method, but we used a cherry-picker to put the longblock back in. All-in-all, if you have an engine hoist and two people, it's not very hard to pull out or put back in even a long-block. Just make sure everything is actually disconnected .

10. Clean everything. Check your injectors to make sure they are in good shape and if you are planning to up the boost a good chunk, porting the S5 wastegate doesn't hurt.

 

Just so long as you use the S4 ECU that will not be a problem.

Vince

 

It will not matter the chassis are the same. The only thing is the 86 model could use the re grounding trick to the pressure sensor where as in 87+ you should not ground it. As Mazda made some changes in the voltage here. So all the FC chassis being the same here in the engine it will bolt directly up and the procedure will be identical to all TII swaps.
Are you wanting to convert the car to like a TII or just put the motor in?. The entire dirvetrain is swappable in a whole. You can also use the NA drive line they hold quite well actually but with a upgraded turbo I would change to the TII line.
If you use the proper flywheel. the NA tranny must use the NA flywheel and the TII tranny must use the TII flywheel this also includes the starter. The flywheel must also match the series of motor this means DO NOT put a S5 flywheel on an S4 motor.
They are the same 4:10 however not all NA rear ends were LSD, S4 is clutch style S5 is viscis "how ever you spell it"
It is highly desired to use the NA wire harness. If you do this you only need to make a couple wire length adjustments under the hood. If you use the TII harness you will need to make adjustments under the dash. If you use the TII trans a few more wire connector adjustments need made to the tranny. Please note the 86 model is a low impedance injector setup and the S5 uses the high impedance injectors. This means you will need to bypass the voltage block. The block is silver bolted to passenger front apron. If you chose to use the high imp injectors.

The only issue you have is the OMP and TPS setup of the S5 motor in an S4 car or electronics. But lets get thru this before we get there. Most people prefer swapping the covers and TB.
You will need the half shafts with the TII diff and also the TII tranny and drive shaft or at least a custom drive shaft as the flanges are different.
Correct bolt in.
Just the pump. Pump depends on power output stock turbo run the FD fuel pump.
Well this depends on the pullers experience to me umm a 2 maybe.

 

i swapped a 90 T2 engine into my 87 n/a and i didnt have many problems. i had a custom driveshaft made for 200$ because the ones from mazdatrix are way too expensive, my stock rear is lsd. I kept the tII trans because i didnt trust my old beat up one, u can pick one up for like 150$ i would just spend the extra money. It took about an hour to pull the engine/trans out together, i have done many domestic swaps and this was cake compared to them. what im worried about is what are u doing for wiring?

 

well I was hopeing to keep the stock wire harness (s4 n/a) the motor I am getting is s5 T2 engine with s4 T2 intake, turbo and manifold

btw would I need a S4 T2 ecu then if I use the stock S4 n/a harness


THX for all of your help I have writen this all down I appreciate it Iceblue (and everyone else who has offered hints)

 

You should use one yes.