98+ 5S-FE picture thread., Might be of interest to you if planning to go EMS. Options

[Syaoran]

So I bought a new 5S-FE engine for a total of $963. It's the newer 5S-FE which comes with various upgrades, some of which include a crank angle sensor, cam angle sensor and 2 coils for a distributorless ignition.

I'll put some pics with descriptions where necessary, and I've found this is the engine to buy and build if you're going the 5S-FE route, be it N/A or F/I, or 5S-GTE. It's more EMS-friendly than the older engines, I'll explain why with the pics.


Even though the newer engine is better in some things, the older ones are better in others. Here are the fuel rails side-by-side.



As you can see, the injectors are the same. However if you look closely, the new 98+ rail is returnless (as it came in the engine I bought, they had 2 and both were the same). It is also smaller, much smaller.


Returnless systems are worse than ones with return because the AFRs are less stable. The return system basically uses the fuel pressure regulator to keep the system feeding fuel to the engine more constantly. Ideally you'd install an adjustable FPR, but in my case that won't be necessary for the time being. The stock FPR I believe runs at 43.5PSI of pressure which is good enough.



Here's one of the more important pics:



That is the crank angle sensor wheel. I consulted with a friend of mine who has experience with these, and he told me it's a 36-2 wheel. It's missing 2 consecutive teeth. The beginning and end of that longer tooth slightly protrude, so you can count 32 separate teeth plus 2 on that longer one, and it's missing another two.

The engine I bought also has this:



That's a cam angle sensor with a single tooth. I'm not sure what the tooth indicates the sensor (camshaft position) but I believe it is either TDC or several degrees BTDC.


Here are the coils:



They're 2, 1 for each 2 spark plugs. They have 4 wires and I believe they are power, ground, signal and spark confirmation. I have to consult a wiring diagram to confirm that.

That's it for now, I'll add more pics as I go through the engine. You can request any pics you'd like.

[presure2]

with all the work put into the bottom end of this motor, your really gonna wish you had put cams in it.
just look at my dynos before i added the cams, and how power falls off above 5k. modern ignition, and all that aint gonna make a lick of diffrence there, its all about flow, and for that your gonna wanna do cams.
trust me, cams make a HUGE diffrence above 5k, where the 5s needs it most.

[Syaoran]

with all the work put into the bottom end of this motor, your really gonna wish you had put cams in it.
just look at my dynos before i added the cams, and how power falls off above 5k. modern ignition, and all that aint gonna make a lick of diffrence there, its all about flow, and for that your gonna wanna do cams.
trust me, cams make a HUGE diffrence above 5k, where the 5s needs it most.

I know, I will do cams. I know it's easier to do them with the engine off rather than on the car. However my current budget dictates that cams aren't a priority right now.

I'm not gonna drop in cams yet, since I'm going to drop them in along with a shorter and larger plenum'd IM with probably a 60-65mm I.D. throttle body, to REALLY make a difference above 5K.

The rods are there for future upgrades which is the same reason why I over-bored the engine when in reality it wasn't necessary.

Hopefully depending on how my amateur build (with professional assistance here and there) I'll get cams sooner than later.

By the way, the modern ignition won't net me any more power than the stock distributor does at the power level I'm shooting for first, but the sequential injection DOES make a REALLY huge improvement in terms power over batch-fire, and there's a lot of power to be had as well through proper timing control in the higher RPMs.

The physics don't change with an ECU that's for sure, but there's a lot more variables to power than just "ir flow. Air flow does have a more impacting effect on power than anything else does, since air, fuel and ignition are required to make power. I will have the best of the two latter, and will improve on the former later down the road.