struhall

last night, i came across a uber great deal on a s5 t2 motor, and i have LOTS of questions now. ive been searching for about 2 hours just today, not to mention all the times ive thought about this before.

as of right now, i do not have any wiring on the passenger side of the car (daily driver with holley carb), and im thinking that if i get a stock s4 or s5 wiring harness for the passenger side, just for the injectors.

i dont plan on using any of the emmisions junk, because where i live they do not check emissions.

i was wondering about the dizzy/crank angle sensor. is it possible to use the gslse dizzy if im using the s4/s5 wiring harness for the injectors and such?

for some reason, every write up ive read doesnt go into any detail about this. i know this has been covered so many times, but i just cant seem to find it.

thanks in advance

struhall

and another question. i know the s4 and s5 injectors are diferent, but what else is different betweent the two. and for those that have done the swap, which one is easier to use?

gonzz

Look in the archives under TII swap. I have read about 3 threads that will answer 90% of your questions.. Personally i would do a aftermarket ECU. Easier in the long run.. You will need FC coils, gsl-se front cover and oil pan.. that's just to mount it in the car. TII trans is also recommended. You will also need a driveshaft made..I would use the S5 CAS also. Injectors are different from the S4 and S5 but with a standalone that doesn't matter.. Go with the S5 if your going to use a standalone..

struhall

the motor is an s5 with tranny, i have an fc parts car at my shop that still has the coils, and some of that other stuff. i should have most of the fc sensors and parts, but they are all s4, and some are fire damged. and the car im putting it into is a gslse, so ive got the oil pan and front cover under control.

what is a the CAS? its not ringing a bell right now.

blazer1313

Crank Angle Sensor. -sends a signal to the ignition coils of when to fire. You will not be using the dizzy with the conversion. If you're looking for cheapness then just use the S5 wiring harness for now. You'll have to splice into the wiring harness under your dash or better yet remove the dash all together and swap out all the harnesses.

struhall

so are the harnesses under the dash the same on the s4 and s5. my fc parts car is fine except for the harness on the drivers side in the engine bay where some wires are cut and some on the passenger side, but that one will have to be the one from a turbo car anyways so im not worried about it.

and does anyone have a wiring diagram or instructions that i could use and splice my wires together? and is there a way to unplug the fb harness on the drivers side without taking the dash out?

fcrotornut

just run a megasquirt or find a haltech.

save yourself some headaches

steve84GS TII

S5 engine will require the S5 ECU and wiring harness for several reasons......
The S5 injectors have their own plug design.
S5 uses an electronic oil metering pump which cannot be removed from the system or the ECU goes haywire(limp home mode)
The S5 has different control gear,such as dual TPS and linear AFM,the S4 wiring and ECU cannot control these components.

The S5 is a unique system.It is superior to the S4 and SE injection,but that also means its a little more complicated.For starters,its less tolerent to having stuff pulled off and unplugged.Since it has more codes,a real check engine light,and a limp home mode built in,the ECU is more likely to protest if you start removing components.Also,the electric OMP will not bolt to any 1st gen front cover without modifications.
Do a search for S5 swaps and/or my name......youll find all the info you need regarding S5 engine swaps.Ive been running mine for about 5 years now,fully complete and smog legal,with a fair amount of mods.The S5 is a great setup,you just have to bend to its will a little.......

Dan_s_young

iTrader: (1)

^^^ But going to a standalone setup will elimate most of these problems will it not??

dean23

can someonw explain what standalone is? iev been hearing it a LOT but nobody ever says wat it means.

fcrotornut

standalone ecu is a replacement ecu with the ability for tuning.

like a power fc, or a haltech.

jamie, i you are really serious about the swap, ill ask travis if he doesnt mind setting up a megasquirt for you,he ran his own on his old s5 t2 and is real familiar with them.

steve84GS TII

Yes,it will make the entire install a walk in the park.

But,that doesnt mean that getting it finished and drving will be easy.
A standalone requires tuning from scratch.That means dyno time and more $$$.....on top of the cost of the standalone itself.It also means the potential for problems during the tuning phase. Many an engine has been blown up by incompetant shops or pushing the limits,before the engine has even been broken in.
The factory ECU is pre-tuned,ready to run.And being metered air type EFI,the stock TII system can be upgraded and cranked up without changes to the ECU.It uses its various sensors to measure airflow and meter fuel appropriately.
Standalones,like the FD engines,are speed-density EFI which is programmed to "guess" how much air is going into the engine based on a program.If you do any mods,the ECU wont know it,thus they have to be re-tuned whenever air or fuel delivery is altered.
Plus,it can never pass any smog test.....

Yes,Im biased,simply because I like the stock EFI.But Im not naive either.....standalones are the ultimate for power and flexibility,most will destroy any factory EFI in a HP war. But standalones are not an end-all,cure-all either....and they arent cheap.

85rx-7gsl-se

iTrader: (2)

A quick thing. I am just finishing up a 85 GSL-SE TII S4 engine and trans swap. You have to use the FC Air flow meter. The GSL-SE unit is totally different. Hooks up, but no worky.

struhall

ive been reading for several hours about different standalone ecu setups, and so far the megasquirt is looking to be the best bang for the buck, but ill be doing more research before i buy anything that expensive.

any suggestions?

gios79rx

yes less truble get a standalone, i sure know the truble with stock wiring
save your self problems

Dan_s_young

iTrader: (1)

Best suggestion that I have is find out what other RX-7 guys and tuner shops in your area use. That way you can get all sorts of help if its required.

fcrotornut

struhall lives around me, the nearest rotary shop is gotham racing, about 2 hours away

Dan_s_young

iTrader: (1)

If gotham racing is that close to you, you have alot of options. Steve Kahn is a awesome tuner who has experience with a good range of ECU's. So you are deffinately not limited by that... Do your research and find out which setup matches the goals you are trying to achieve. Alot of it is personal preference...

struhall

in my research, i think i have what i wanna do now. megasquirt, and use the dizzy and everything like i have in the first gen now. and use the megasquirt to control the fuel only.

my thoughts are that once i get the timing set right, it should be ok, and just tune away.


is this a good idea, or am i going all kinds of way off?

Directfreak

iTrader: (2)

On a side note.

Is there EVEN ONE PERSON who is using a Megasquirt (successfully) on a Turbo Rotary?

Just curious. I always see people recommending the megasquirt, but I never see it in action.