3S-FE performance tuning. - Toyota Nation Forum : Toyota Car and Truck Forums

Zomeone · 02-18-2004, 06:45 AM

Went trough most of the forums threads that included stuff about 3S-FE. To my great surprise, I found out that Toyotex sells high compression pistons for 3S-FE engine. Been looking for those for over 6 months and finally found ones

Now, the question is, I have had my cylinder head made already increasing the compression ratio from 9.8:1 to 10.7:1, now, what happens if I install 12.5:1 compression pistons..? Valves starts to hit the piston? Compression goes way over 13? Pump fuel might not be enough then if I am correct?

Other questions, anyone compared 3S-FE and 5S-FE pistons, rods and other downstars parts? I am thinking about stroking my 3S-FE with 5S-FE parts, and I am wondering if the parts will fit without too big work..? Changing the stroke to 91mm would give me 2113cc..

And NO, I am NOT turbocharging it, NA all the way

Hotwheelharmer · 02-18-2004, 07:34 AM

Dude if you have a head that gives you 10.7:1 compression you should be hitting valves already. If you go with 12.5:1 pistons you will no doubt be hitting valves because those pistons were made to give ytou 12.5:1 compression with the stock head. As for the 5sfe the pistons are the same design on top but I think they are a little taller and I know the bore is bigger. I don't know for sure if you can use the rods and crank from a 5sfe in the 3sfe I beleive there are some differences that makes it so you can't directly put them in. What are you building your motor for? Just street driving or racing any where? That could help you decide how to build your motor and at what RPM you are going to be running to determine how to build the engine too. If you are planning on running at higher RPM then ditch the stroking idea because the bigger the displacement the less rev worthy the motor is.

Zomeone · 02-18-2004, 02:34 PM

Building this gizmo for street use, but still, I want a good punch of power from it

I am aware that the longer the stroke, the less rpm engine it will be. I won't hit valves yet, but if I get the high compression pistons they would need some grinding I know

Especially now when I am considering 3S-GE valves

So, better to forget the stroking then..

My goal with this engine is to get it over 200hp just to show people that even F engine is worth tuning

Hotwheelharmer · 02-18-2004, 04:23 PM

It is going to be hard to push 200 hp out of a 3sfe. Beleive me I was on that path and still am(just don't have a car for it right now). I am a big NA fan so I know how hard it is. As for the 3sge you are not going to proove anything with them since they are they same diameter as the 3sfe ones. If you want to get 200 hp really start with your head and your flow of the ports, then maybe see if you can get some bigger valves and do some combustion chamber work, as for the bottom end I would really just get some stronger pistons but maybe not increase the compression. You don't gaine much power from higher comp so you might as well keep it at the compression you have now for a few reasons. One reason so you have a better chance of not blowing the motor. Another reason is the higher the compression the higher the octance and timing adjustment you have to do and if yo uare using this for the street I don't think you will be able to afford to go to an airport to pick up 120 octance gas because trust me 107 octane will probably be pushing it with the sounds of the compression you want to run. To keep on the bottom end I would lighten things up get some lighter rods made for a 3sgte(will work on the 3sfe) and either get the crank knife edged or get a lightweight flywheel(don't get both because that is over kill and you need some weight for some rotating mass). Also go ahead and get the cylinders bored no more then 30-40 over(recommend 20 over) along with getting some stronger then stock rings. I would also suggest getting your pistons coated by swain tech to help with the heat. Although this will probably not give you any power it will help with friction and make things more effecient and last longer. Put a metal head gasket on there(you can use one from a 3sgte). I suggest getting the TRD one and taking a layor off(there are 3 layors) and that will give you another hp or so(makes it a little bit higher compression).(I did this when I rebuilt my motor on my 88 camry with a 3sfe). Back to the top end. See about getting your cams reground as big as you can get because in NA bigger cams are better. And get some stiffer valve springs(can use the ones from a 4age). Plus if you really want to get into it either get the toda shimless buckets or have your bucket bores bored to fit the Toyota shimless buckets. The springs and the buckets wont give you more power but they will lighten things up and will help give you some more RPMs to be able to rev to. Next focus on your intake system. I would suggest sending your intake manifold to extrude hone and have them hone your runners. Then find a way to get a bigger throttle body and port match the intake manifold to the throttle body. Alson with getting a nice intake system like a CAI. Next go to your exhaust and make sure it is free flowing but not to free that you don't have any backpressure. If you went with a header, no cat, 2.25" mandrel bent piping and a free flowing muffler you shold be fine. With all that I would say you MIGHT be at 180 hp and that is after it gets tuned properly. And by tuned properly I mean with a stand alone computer. Also I wouldn't worry too much about your fuel system(don't get me wrong look at it and consider some things but this isn't forced induction so you don't have to worry about it as much). Maybe get a walbro pump and definitly get a fuel pressure regulator but as for injectors and such that I wouldn't worry about the stock ones are fine. Also get an oil cooler and see if you can get a cooler thermostat to help out. Trust me I know it is very hard to get power out of a 3sfe.I have been trying for a while and I respect anyone who tries to get power out of it. I am just telling you straight up from a guy who knows it will be hard to get 200 hp out of a NA 3sfe. I am trying not to get your hopes up because you will be dissa pointed in what you actually end up with. Also it isn't always about how much power you make but how effecient you are with what you have. Being effcient will actually make it seem like you have more power then you do and it will help your engine last longer so you are not always rebuilding it.

almc2242 · 05-06-2004, 06:57 PM

Guys, this is quite interesting. I'm a RAV4 owner with performance in my mind. I'm planing to install a header. Can you give me any links to anyone who makes performance parts for the 3SFE engine. I have a link where they make hyperutectic piston for the 3SFe engine. these are 30% stronger then stock and can be turbocharged and/or Superdharged.

http://www.importperformanceparts.ne...perpiston.html

I onced used them on a 350 checy with turbo, they worked great. So good, my 77 Nova was stolen and detroyed in a joy ride.

1fastLE · 05-07-2004, 09:59 AM

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Tooty Car · 12-26-2009, 05:25 PM

Question for Hotwheelharmer. Can you put a 3s-gte head on a 3s-fe? Or will it not work because of the cam setup? The bolt pattern must line up if the head gasket from the 3s-gte works on the 3s-fe. I ask because I'm rebuilding my 3s-fe and trying to get some more power out of it. Thanks.

fredk · 12-26-2009, 06:39 PM

you wont have much compression with a ge head and fe pistons

Tooty Car · 12-26-2009, 09:34 PM

Less compression is ok since i'm planning on turboing