who has st205?

[TRDmod]

who has a st205 here,
i just want to know who has a st205 and boosted it more than 12 psi which i believe standard-ish

i have my high setting on 15 psi, 1 bar...so 14.7 but it go a lil ove the line so im putting 15 as a round figure.....

i wnt ot know what probems you guys had, any detonation or destroying engines? i mean 17 psi you guys say, how safe is it on standard water air intercooler..? i run 98 at all times, no less.....but i have standard WAI....

please tell me what problems or isues you guys have IF ANY....cos i would like to put it to 17 psi, but dont wanna have problems, i mena 15 is alot of difference with 12, i feel the difference it feels good,a nd i can only imagine 17 psi how nice that would be......

thanks

[GT4 20]

I'm currently running 16.2psi. 17psi (1.2Bar) is generally regarded as the safe maximum on a standard engine. Antything above that and you'll hit the fuel cut. From what I've read, pistons are the weak link when going higher - rods aren't an issue unless you plan on going to extremes.
WAI is very effective up to around 350bhp. To help maintain its effectiveness, clean it out with petrol and lag the underside with some heat reflective material - this'll reduce heat soak from the motor itself. You could also look at activating the pre rad water spray bar if you have a WRC model. Though the nozzels aren't that good by all accounts - easily rectified by fitting some better ones.
HTH
Gary

[TRDmod]

184.3 at 16.2 psi, so lets say 17 psi, what other mods you got to get that dyno run?

i dyno mine on 164.8kw at the wheels on standard turbo and standard boost. 2.5 inch and pod filter.

the reflective liner is a good advice, i will implement that immediately. but the petrol, do you mean i should take the WAI and wash the inside iwth petrol???

just wanna know other mods you done to urs or is it also pretty stadard.

[TRDmod]

also, engine-wise, wrc has no difference in the engine really does it?
i mean its got some other things on it but engine is really just the same one

[GT4 20]

Engine is the same between WRC and non WRC versions.
Yep, remove the WAI and clean the insides out completely - petrol is good at that.
All that has been done to mine is TOMs panel filter, 2.5" exhaust (decatted) inc downpipeand Profec B Spec II.
Won't be standard for much longer - have big(ish) plans for it
Gary

[TRDmod]

mines got completely custom exhaust manifolds, attached to a 450hp rated turbonetics huffer, (people say that its a good turbo, but is it efficient, i mean is it considered to be a efficient turbo?)
ex wastegate, 38mm i think. custom downpipe 3 inch into a 2.5 inch exhaust all the way. de catted too obviosuly. the sounds much better:)

the wastegate plumbs right back to the exhaust to reduce annoyance in the noise.

do you think manifold would make more power or just reduce lag and improve response.??? what od you think? im getting water injector and full computer on my car soon too...suspension first

[GT4 20]

Water injection will be a waste of money unless you are having detonation issues. If not, it will only give your bragging rights with your mates. Those 'in the know' won't be impressed

Properly made/designed exhaust manifold will improve response and reduce lag - real benefit will be in conjunction with a gas flowed head and free flowing intake system.
Gary

[fivebob]

Water injection will be a waste of money unless you are having detonation issues. If not, it will only give your bragging rights with your mates. Those 'in the know' won't be impressed

Just who would "those in the know" be? I can only think they "know" very little about the 3S-GTE and it's propensity for self destruction

[GT4 20]

So you reckon that WI is necessary on a 'midly tuned' 3S-GTE? If it is, then the fuelling hasn't been set up correctly IMHO. Once you start hitting higher power levels, then I agree that it would be an added bonus, but I am working on the assumption that TRDmod isn't going that far as he's mentioned nothing about uprating the engine itself.
Gary

[fivebob]

17psi with the stock pistons is enough to destroy them. Been there done that (twice), though not on a ST205.

IMO any insurance you can add is good, and certainly worth it. Especially if you combine water injection with a decent ECU that can alter the fuel and timing based on the flow of the WI system

[GT4 20]

Not disagreeing with you on the WI as insurance (I will be fitting an Aquamist system to mine when I up the power), but if fitting a decent aftermarket ECU and keeping the boost to a level where the pistons are unlikely to fail, providing the fuelling etc is done properly, then WI shouldn't be necessary. I personally feel that TRDmod would be better spending the $1000 or so for a WI system on other mods at this stage.
Gary

[TRDmod]

well, if i get a water injector its a good safety margin. i mean 17 psi, thats definatley not standard, thats 50% more boost that standard roughly. so a water injector is good, also i want to get a computer system on my car. so its not gonna harm my car, but can only be good for it...is that correct?

by what you are saying, its not a matter of needing it but a safety margin and maybe when i get my computer, maybe i can even boost it harder.

[GT4 20]

If you are going to get an aftermarket computer, as long as it is set up properly, you shouldn't need WI. WI is to prevent detonation which is usually caused by a lean mixture. In standard form, the ECU is programmed to deliberately overfuel - the excess fuel acting as a coolant. Back the fuel back to 'weaken' the mixture and WI may need to be added, but add too much, and you'll lose power. Just get the fuelling set up correctly in the first place and you'll be sweet at 17psi.
However, if you plan on going higher than 17psi, then I think you really need to look at forged pistons. From what I understand (and I have no doubt I'll be corrected if I'm wrong ), the land rings are one of the first things to break on the OE pistons. That's as much to do with boost pressure as heat. I wouldn't dream of going over 17psi on mine unless I've uprated the internals - purely from a reliability point of view. Hence why I'm rebuilding my 3S-GTE before I throw more boost at it. And I will be installing my Aquamist WI kit as I'll be running much higher boost.
Gary

[TRDmod]

shops sell these kits, je piston kits and just generally 'forged piston kits' they come wit the pistons and some really thin looking Rings. some of them come with con rods but miost just the piston and the rings, are those what you are talking about the pistons and the rings? that need to be reinforced. the kits are relatively cheap, selling bout 1200 to 1500

if i was to uprate my internals, what do i need to buy to do that to put more boost, say...20 psi?

i mean i wont be running more an 17 psi. but uprating the internals , if pistons and the rings are all i need, thats relatively cheap, i mea thats not that much. rebuilding what do you change when you rebuild?

just want details. i mean i dont want ot change one thing and have another little thing unchanged and crack or blow up on me. i guess if you are gonna do it, you gotta do it right...right?

how many psi you planning on putting on yours? and what mods you doing to cater for that psi?

basically, what im trying to confirm.......if i run 17 psi right now on my WAI and standard fuel (i know when i last took my car to the dyno, my fuel was very rich.) would it detonate, would i have issues iwsth that? or would it be fine, you said you run 17 on yours and its ok...i assume you also have relatively same set up..?

[GT4 20]

As above, 16.2psi with basic mods.

Plan is to get the block tested for any imperfections and then bored out to accept a set of .5 oversized ACL pistons. Keeping OE rods but getting them shot peened. New bottom end shells etc and everything fully balanced along with a lightweight flywheel. Gas flowed cylinder head will finsih that stage. Plan will then be to run the engine in properly to bed in pistons etc before next stage which will include Apexi ECU, tubular exhaust manifold, custom inatke set-up and different turbo. Max boost will 'probably' be around 20psi.
Gary

[TRDmod]

thats alot of work, boring the engine out too sounds very extensive and full of $$.

whats do you mean shot peened?

[RomanV]

Thats only bored out half a mm over, not much at all.

That and a hone would only cost a couple hundred bucks at most, if you gave them the stripped block.

[Tranquil]

3S-GTE? If it is, then the fuelling hasn't been set up correctly IMHO.

Whats fuel got to do with Water Injection?

This is the primary mis-conception of water injection that its to compensate for lack of fuel. What do you know about ignition timing, specifically the merits of advancing and retarding the ignition of A/F mixtures?

"Those in the know" would be a hell of allot more impressed with a well setup water injection system (with boost/TPS/temp/water flow mapping) than a "tubular exhaust manifold' and power FC.

[TRDmod]

so tranquil you see the merits in a water injection system?

do you think i could benefit with one, i would link it directly to my computer