RE NEW BOOST ST205

[TRDmod]

hI GUYS
i have currently installed a 450x350x350 roiughly that size, its a big ish intercooler front mount
i was wondering, i used to boost safely on 15.8 psi with my wai

what do you think i can boost safely now? 17? 18? any ideas? any experiences on standard internals?
front mount i know gives more capability with boost
thanks
but i wann hear opinions
and better yet, experiences

[diss7]

I ran 17.5psi on my stock st205 for about 12 months. Stock fuel, stock intercooler. Car was wrc, so turbo had steel internals.

With 17.5psi and a new downpipe I did a 13.3@100mph.
Compared to 13psi, stock downpipe - 13.6@97mph

[Santa'sBoostinSleigh]

hI GUYS
i have currently installed a 450x350x350

that is one massive cube intercooler i think you mean x50, not x350!

i dont really see how a FMIC and a W2A IC would dictate what boost pressure you can run, all will depend on efficiencies and piping length (obviously a FMIC has alot more volumetric capacity when you include all the piping - this can mean big lag if you dont get it right)

[TRDmod]

yeah sorry the extra 350 was a typo

people say lag but i dont feel much at all - so whats the vote, 17 psi would be safe ish?

[Chickenman]

hI GUYS
i have currently installed a 450x350x350

that is one massive cube intercooler i think you mean x50, not x350!

i dont really see how a FMIC and a W2A IC would dictate what boost pressure you can run, all will depend on efficiencies and piping length (obviously a FMIC has alot more volumetric capacity when you include all the piping - this can mean big lag if you dont get it right)

...cools the charge more and therefore you can run more boost without detonation. But only up to the motors limits of course.

[TRDmod]

so what do you think the motors limit? i mean more boost is all good but i dont wanna warp anything or blow anything up. so 17 psi, 18? i have herad horror stories you see, but.... just wanted to hear experiences, so far we have a 17.5 er here, with stock wai

anyone else dont a front mount? or higher boost with wai, and please tel me what you have, stock internals? forged? thanks

[Chickenman]

I would leave it at 12-16.

There's no reason to risk everything on a daily driver.

If you do intend to drag it then 18 seems to be the safe-ish max.


Your turbo (if it's ceramic) will be a limiting factor... these can fall to bits.

[TRDmod]

its a steel 450 rater turbo. cool thanks i would prob take on dyno at 16
see how i go as well as 12 and 16

[Santa'sBoostinSleigh]

...cools the charge more and therefore you can run more boost without detonation. But only up to the motors limits of course.

BUT youve got more volume to fill to reach that boost level - gotta make sure the turbo us up to the job.
W2A IC's are reasonable efficient - especially during drags, as a FMIC isnt intercooling when stationary (ie at the start line) and you get a big whollop of hot air before you get to a decent air velocity thru the IC.
those barrel intercoolers are meant to be good, but they are pricey.
a good setup would be a W2A IC running water wetter + ice for racing setups.
no idea on what boost is deemed 'safe' on yours tho sorry

[Adydas]

I know a way to find out tho.. Dyno run

[dougsop]

i guess a large FMIC will give u the POTENTIAL to run high boost, but at stock internal i will say 17psi is the safe lev (thats wat i heard most of the time), and also stock WAI is good up to 350hp.

i guess to boost over 17psi u will need
Block clean up with de-burred oilways
Rebore and hone (+0.5 pistons)
New main and big end shells (recommend TRD)
Forged pistons (which ever make takes your fancy)
Forged rods or OE shotpeened and polished
Full balancing of bottom end
Lightweight flywheel
Uprated clutch (a must for big power)
Gas flowed cylinder head (not a quick run over with a dremel!)
Cams of your choice
Uprated valve springs
Gasket sets for everything
Fluids

(got those info off gary )

[TRDmod]

cams?.
why must i need cams, cant i use standard ones?

just approximate, how much power would i get out of that set up doug? and how much should it cost for all of that

[GT4 20]

With the mods that dougsup has listed (and a few other bits), I was looking at acheiving around 220kW @ wheels with a decent dyno tune. Guess we'll have to wait and see now until the new owner gets to that stage
As for cost, if it's done properly, you'd need to budget around 10k.
Gary

[TRDmod]

220kw atw

thats not much at all

in fact, thats not much generally, im expecting 220kw or close with 17 psi with my new front mount, im taking mind to dy no though, its all speculation but i have 206 at the wheels with my old set up minus the FMIC - at 15.8 psi, 1psi is generally 10-15 kw atws i found.

so for 10k spending im expecting, well frankly, alow more than 220kw, i want close to 400-450 bhp

i thin i can get 220 or very very close minues 1 or 2 kw at the wheels with my current set up at 17 psi.

forged internals i would assume you could all those reinforcements for strength i would assume you would boost way past 17, maybe 22 - 25? perhaps, im guessing here - that would be huge huge power! thats all for bout 10 k,

[GT4 20]

I was going to acheive that running less than 20psi. If you want to go for higher boost, then over 220kW would easily be possible of course. But given that it's a road car, going much higher would be pointless and reduce reliability, especially with the drivetrain.
As with most things in life - moderation is good
Gary

[Al]

If you want a quicker car with a 3sgte buy an MR2, its that simple.

You don't need to spend god knows how much and still run 13 second 1/4s

[dougsop]

the mod gary told us there is for a strong and reliable car, yes i guess some ppl can achieve more power atw with the sti and evo with less $$, but i just wonder how long will that car actually last.

i heard fr this guy down at CSS, his STI have hell of a lot of power but the fact is he blown his engine like 3 time in a yr.

so i guess after all is up to u, if u want power fast or u want to work it step by step


btw keep me informed with ur setup and specs

[nick280]

There is is a guy on the GT4OC that ran 440BHP on standard internals for over 18 months with no problems.

What killed the engine was the injector cap blowing off into the engine cause major damage.

The injector turned out to be faulty and the failure was not caused cause by the huge amount of power this car was developing.

My car has run 1.2bar (17.5psi) for almost 2 years now and never failed.

Reliable engines boil down to good maintanance, low intake temp, good fuel and a good mapper.

Cold intake temps and no 'det' = safe @ big BHP.

You dont need forged internals for upto 350bhp if your set up is right and you've a good map man.

JMO

[TRDmod]

yeah fair enough
i guess i want huge power reliably so i will go with the list you provided, i already copied it and getting quotes, but thats my stage 5 mods.

thanks for the feed back sounds like 17 to 17.5 is safe on my FMIC and my stock internals