can u turbo a 5fse?

[mrturrari]

You cannot take pistons from another motor and expect them to fit... there are too many differences like bore, pin height, valve reliefs and dish volume. No one makes off the shelf forgies for the 5s but you can get custom ones. I got mine from atomicspeedware.com for about the same price as off the shelf ones. You just need to give them all the relevant measurements for your build. And make sure you bore the block after you receive the pistons. Forgies require more skirt clearance and your machinist needs to bore to the specs for that particular piston.

Gairloch where did you get those numbers? They are a little off. The 5sfe bore is 87mm and the stroke is 91mm from the factory with a 2164cc displacement.

[blumr2]

Ok. Thanks for the help. I'll try that.

[blumr2]

I went to the that site you gave, and you said that the bore for a 5sfe is 87mm. That site has 87 mm pistons but it says they are for the 3sgte, could i just use those? If not, do you think they would still have the measurements for your pistons, then they could just make another set?

Thanks

[Epic1]

Ive noticed that theres pretty much no talk about turboing a 3s-ge. Isnt that a newer more powerful engine than th 5s-fe? I have an n/a and am weighing my turbo options as far as whats best in the long run.I d really like to know thanx

[mrturrari]

Originally Posted by blumr2

I went to the that site you gave, and you said that the bore for a 5sfe is 87mm. That site has 87 mm pistons but it says they are for the 3sgte, could i just use those? If not, do you think they would still have the measurements for your pistons, then they could just make another set?

Thanks

Those pistons are probably for building a 5sgte using the 3sgte head on a 5sfe block. They won't work well in a 5sfe. Also you could copy my specs but my pistons were custom for my motor which has been heavily modified. If you call up Nick he can walk you through what you need for your motor.

Basically you need the following information:

Bore - 87mm is stock (if you have high miles on the block you will probably not be able to stay stock), 87.25mm, 87.5mm or 87.75mm (that equates to +0.010", +0.020" or 0.030") depending on how much you have to bore to get the cylinders cleaned up or you are looking for a little more displacement. Your machinist will need to tell you how much you need to go.

Stroke - Unless you offset grind the crank and use 3sgte rods to stroke the motor this will be 91mm.

Valve size and lift - stock, +1mm or +2mm for the valve reliefs. Lift is 8mm stock but if you have high-lift cams it could be higher. Stock valve springs coil bind at about 9mm lift.

Chamber volume in the head - Stock is about 39-41cc if I remember right. You need this for them to make the right dish volume on your pistons to get the right CR. You should measure it to be sure.

Target compression ratio - for turbo I would go with a max of 9.5:1 and if you are going to be running a lot of boost 9:1 or even 8.5:1. Cams will also have a significant effect on how high of CR you can run at what boost.

Rod length - 5.433" for stock rods or 5.428" for 3sgte Eagle rods.

Pin diameter - This will be 22mm (.866") for 5sfe and 3sgte rods.

Deck height - You will usually want this to be 0.000".

How much boost you plan to run - They need this to give you the right gap in the rings and give the aluminum enough room to expand with the extra heat.

I might have missed something but that gives you an idea of what is needed.

[mrturrari]

Originally Posted by Epic1

Ive noticed that theres pretty much no talk about turboing a 3s-ge. Isnt that a newer more powerful engine than th 5s-fe? I have an n/a and am weighing my turbo options as far as whats best in the long run.I d really like to know thanx

The 5s is actually the newer design but was outfitted for midrange torque and never had forced induction. I think most people will tell you "why spend the time and money to turbo and engine that you can get a version of with a turbo already?". The also didn't come in any USDM MR2s. I mean if you are going to swap anyway then why not just get that version and save the time and money if that is what you want?

Still a few have done it. Do a search and there are a few threads about turboing the 3sge. The same things apply in turboing a 3sge as turboing a 5sfe except there is no dirty hack that I know of to use the stock ECU and get a good tune. You are probably going to either need to convert it to a 3sgte (pistons, ECU, wiring, fuel, etc) or use a stand alone ECU or high end piggy back to tune it. With the higher compression pistons you will also have a harder time tuning it then you would with a 3sgte.

[blumr2]

Thanks for all that info. I'll put some of that in, maybe you could help me fill out the form that is on that site. I'll see if i have any questions. Im just not sure how to get some measurements or what i'll need.

[mrturrari]

Sure, I would be happy to answer any questions if I can. Since this has been stickied why don't you start a new thread so we can keep this one on topic.

[blackbob]

so,uh,how about those 5SFE's !

[blumr2]

Thread created.

[blumr2]

Originally Posted by mrturrari

Sure, I would be happy to answer any questions if I can. Since this has been stickied why don't you start a new thread so we can keep this one on topic.

Thread created.

[doctreetop]

Mine is being turboed this weekend........5SFE POWA!



-KEVIN

[MR2Board]

There is a 5S-FTE FAQ here: http://www.mr2board.com/forums/view.php?pg=5sfte_faq If anyone would like to be an editor, please let us know.

[mister2dt]

http://raceeng.com/p-7933-toyota-5sf...n875mm851.aspx

these are off the shelf forged pistons for the 5sfe. 8.5 comp. for turbo application WITHOUT the 3s head. these are for the 5s longblock.

these are manufactured for race engineering by wiseco last i talked to them, they may be making them inhouse now. excellent piston, just as good as any other on the market.

[ck8260]

Yes you can turbo a 5sfe.Problem is you blow the rings out by bringing up the compression.Thats the problem I have now.Searching for a good way to keep a turbo without swapping.

[blumr2]

What could you do to prevent that?

[mrturrari]

Originally Posted by ck8260

Yes you can turbo a 5sfe.Problem is you blow the rings out by bringing up the compression.Thats the problem I have now.Searching for a good way to keep a turbo without swapping.

I don't understand what you are trying to say? If you exceed your fuel system's capacity you will probably break ring lands, that's true. And since the 5sfe has no over boost safety system, that can be caused by a malfunctioning wastegate or boost controller. For a setup with the ct-26, 315cc injectors, 3sgte MAP sensor and MSD-BTM that limit is going to be about 9-10psi so make sure your wastegate works properly and never go above that limit. Other setups will have different limits. Remember that 10psi on a t3/t04 or ct-27 needs a lot more fuel and in different rpms then 10psi on a ct-26.

[masagsxr]

Awesome infor... has this been stickied? Very cool...