Help with my ST205 GT4

[GT4 20]

oh thx alot for that hehe i will head down to beyond performance sometimes and get them to give me a quote ~ but i bet those ppl will quote sth very very high~

Better budget for at least 20k then

Staring to seem like a daydream after all is it
Gary

[dougsop]

hey gary where did u get urs done ? and how much it cost u ?

[dougsop]

ya kinda ~ m... but well will try do it haha ~ lets see probably at the end ending up bankrup wahahahahahah

[GT4 20]

hey gary where did u get urs done ? and how much it cost u ?

I did most of the work myself. So, unless you have 15k spare to get yourself started, then all of this is wasting everyones time

Apologies if I sound harsh, but there are too may daydreamers around who want 400+bhp and no means to fund the project.
Gary

[dougsop]

ya i see wat u mean tho thx alot ~ i will have to see how things goes just go with the flow i cant just throw 15G in to it right now but i shouldnt have problem throwing 1G in a month ~ but who knows if after 6 months i will get bord of it and stop int he mid so ya ~ so bascailly wat u said is a must for a trubo upgrade or is it just for big BPH ? say if i upgrade the turbo but i didnt boost it to high and run around 300-350 bph will i still need the mod u mentioned ? '

[Malcolm]

is there any particular reason why you're aiming for 400hp? Aiming for power figures is a bit silly IMO, particularly if you don't have a lot of experience with that car. You'd be better off aiming for certain performance (ie 12.5 1/4, or xx sec lap of pukekohe etc). Because numbers like 400hp might sound lovely, but if you've ever driven even a car that can do reliable 12 sec 1/4 miles you'll realise it's a very fast car, and could probably be done with a bit over 300hp @ wheels, which should be doable on the st205 without opening the engine, with just a better turbo, a bit more fuel, an ecu and other supporting mods. Then if you decide that performance isn't good enough, you can get a head built to make more power, then a block to hold more etc until you reach a point you're happy with.

[dougsop]

hey ppl let me correct myself sorry abt that lets say i m aiming for 0-100 in around 4 sec upgrade turbo and wnatta knwo if that is possible with out opening up the engine and if so will engine blow

[vvega]

you can also do 500 hp on the stock ex manifold

v

But it won't be as affective
Gary

?? id like to see a before and after dyno please
if they can get 500 hp from it it cant be that bad gary
hehe
v

[RomanV]

I thought that the predominant use of cast manifolds for turbo engines, was to do with the immense heat created in the exhaust manifold...

tubular manifolds warp at higher temperatures, or at least try to deflect out of shape. (or, that might only apply to certain materials, or crappily made exhaust manifolds.)

(IIRC)

I could be wrong, but I think I remember hearing something along those lines.

[GT4 20]

A decent tubular manifold will reduce back pressure and can grealy reduce turbo spool up time. Especially if each tube is tuned to the correct length. Made a huge difference on my Rover reducing spool up time by some 300rpm. I want to retain good driveability with mine so am more interested in better low / mid range power than 500bhp. Not much point putting your foot down and waiting a week for boost to come on
Gary

[Lanius]

A decent tubular manifold will reduce back pressure and can grealy reduce turbo spool up time. Especially if each tube is tuned to the correct length. Made a huge difference on my Rover reducing spool up time by some 300rpm. I want to retain good driveability with mine so am more interested in better low / mid range power than 500bhp. Not much point putting your foot down and waiting a week for boost to come on
Gary

Thats the trap I fell into with my 185. Power was beautiful at wot / full boost, but that only came on after 4500rpm Coupled with a notchy gearbox that didn't like changing down to second, made it a very tricky car to keep any kind of power while driving round town. Awesome pulling onto onramps though

[fivebob]

oh~~let me guess the price as well ~tell me if i m wrong
~FMIC ($1000)
~tein super street ($2000)
~AVCR ($800)
~power FC(or greedy emanaement) ($1200)
~forge piston rod ($800)
~cam ($500)
~gasket
~flywheel
~fuel pump regulator and injector (injector 680cc venom $600,pump 300 and regulator $200)
~extractor($700)
~ turbo ~ ?? ($1500) for garrett?
~clutch nessary ? ~

total 10G aprox ?
tell me i m right LOL hahaha ~

Woefully inadequate and well short of the costs.

Cams are $500 each and don't forget the adjustable cam gears which should be around another $500.

Pistons alone would be $800, rods are not needed, but if you wanted them it would be another $800.

Turbo would be more like $2000+ and don't forget to add in the cost of a manifold and downpipe which could be anything from $500-$2000+.

The clutch is most definite necessary and will add another $800 or more.

PowerFC will cost more than $1200 with a Commander or better stilll a Datalogit to tune it.

680cc injectors are marginal and IMO too small for your HP goals, but larger ones won't cost more.

Add in block machining, head work, cambelts & temsioners, oil pump and a few other things you've not thought of and like Gary said, budget $15k or more to do the job properly, and that's if you do a lot of the work yourself.

[fivebob]

hey ppl let me correct myself sorry abt that lets say i m aiming for 0-100 in around 4 sec upgrade turbo and wnatta knwo if that is possible with out opening up the engine and if so will engine blow

It may not blow straight away but it will blow, and I'd offer good odds it will be from cracked ringlands in #2 or #3 piston

[dougsop]

mhm than wat do u people think the best i can get out of a GT4 st205 with out opening up the engine ? 0-100 kmh and 1/4 miles ? and with wat sort of mods

[Adydas]

just give it ago.. stop talking about it.. start over time doing things you feel will work and then you can inform someone in the future asking simlar questions.

i have no idea whatso ever what im going to get in fact i dont even know why im trying to do it haha ( more cos i can ). Estimating is all good but untill it spins on the dyno ill never know.

i think removal of the wta for a fmic is a fatal error tho, and allmost a crime against toyota

[RomanV]

Yeah, things are always more expensive than you think.

My engine rebuild is going to cost about 6k all up, and I'm not even modifying it. (Well, in fairness, 6k is including the purchase price of the engine/gearbox/axles etc.)
Just a straight replacement for new factory bits.
(well, factory gaskets/belts/pistons/piston rings, I did do a few non standard things, like getting a decent clutch, balancing the bottom end, getting the head reconditioned, etc.)

If I had paid for the mods that it already has, it would easily cost another 2-3k.

And this is an NA motor, I dont even have to worry about things like turbos, intercoolers, etc. etc. which can add considerably more cost on top of that.

[Al]

*shameless plug*

You could always buy my car, its still a 3sgte, pulls 12s and has done 0-60mph in 4.59 seconds