seventhgear

i know u can do it... basically in a nut shell....
i want to use the s4 wire harness so...
i need to use the s4 intake tube/afm/tb
and i need a s5 ecu...
basically everything else is plug n play am i right?
thanks
jack

YakATK

I am doing the exact opposite of you, a S4 into a S5, and from my learnings you cannot use the S5 ECU/Wiring Harness with the S4 engine, you have to replace all the electronics to make it work (again from my learnings), but might be different for going S4-S5, and not only that but I am going S5NA to S4Turbo....so may be different for you, but expect to change everything electrical.

hypntyz7

Guys, if you stand back and think about it, it's not too hard. You have series 4, and series 5. Both are electrically different in almost every way. Read: you cannot mix and match electrical parts at all between series.

To run one engine in the other car, there are 2 options. One, is to change every wire and sensor in the car from one series to another. This is viable and necessary only when doing something like yakatk is, essentially swapping bodies from an s4 t2 to an s5 NA, which are TOTALLY different in every way. For him, that is the only way to make it work without finding a lot of expensive, rare s5 t2 stuff and making a hybrid, when there is no reason to if he has the whole s4 t2 donor car.

The way most people should do it, most of the time, is when they just want to run one block in another car. IN this case you keep all the accessories/wiring from THE CAR YOU ARE KEEPING and bolt it onto whatever block you want to run.

In this case, you will put an s5 block into an s4 car IIRC. you'll transfer the following S4 parts onto the s5 block to make it work...the car still thinks it is an s4 engine, but you get the added benefit of higher comp. ratio and higher redline.

front cover, OMP, water pump housing, WP, alternator, complete intake, wiring harness, fuel rails, injectors. Note that even if you leave most of the emissions on the new engine, it still will have a hard time passing, as it lacks an EGR valve. In this case I would leave the vacuum rack totally off, and run with no emissions/controls.

Remember that the front counterweight and rear flywheel MUST be retained with the block it came with as part of the *balanced rotating assembly*.

seventhgear

OK WELL I DID NOT ELABORATE ABOUT BEING N/A OR T2... SORRY
im swaping a s5 n/a engine to a s4 n/a car....
jack

seventhgear

sorry hypntyz7... thank u for the elobarate post though... u taught me a few things..
jack

seventhgear

^^^ n e one else?
thanks
jack

seventhgear

ohh.... well i cannot leave the s5 intake manny??? hmm thatz a new one to me.... all i am putting on the s5 is a/c ... i have removed my power steering and airpump.... no emissions in florida... so if i change the omp / water pump housing / wp / alt / and remove all vacuum lines..... it would basically be plug n play ?
thanks
jack