turbo recommendation for 3sgte

[Shifty]

running a st215 3sgte, this is the late model one so 9.5:1 CR

turbo recommendations? looking for about 320hp atw

any reason i couldn't run a gt35r @ say 18-19psi with this CR on pump fuel? at this boost it should be close to its efficiency range and close to making around that power level? no intention to go cams but with that CR it should come on boost fairly well and i'd imagine i'd have circa 8,200rpm to play with (any caldina guys confirm stock redline?) so assuming i had good boost by 4500rpm or so it would have a workable power band.

i have an aftermarket ecu, big fuel pump, and the stock injectors are (apparently) 540cc so I should be right to get it up and running and 800cc injectors seem fairly common so that should be an easy upgrade.

only reason i ask is they are not much dearer than considerably smaller turbos and lots of people seem to buy them but never use them so they're available brand new buy second hand for $1200-$1500 semi-regularly, and also second hand off xr6ts for cheaps. i figure as long as a gt35r would be workable with my intended usage then i'd still have the overhead if i wanted to play silly buggers with more boost or use it on something else later.

[jonathan yee]

...gt35r too big for just 320hp atw i'm pretty sure. your only putting through 2 wheels yeh?

i would've thopught a gt28 should be enough, but yeh if your not wrried about full boost till 4500rpm then i wouldnt think you'd need 18 psi to get 320hp.(unless you meant 320kw)

i'll admit i dont know much about turbo's but i'm pretty sure one of the mr2 dudes was making close to 500rwhp with a gt35something. on a built gen2 stroker mind you.

[Shifty]

I know it's 'too big' for an ideal 320hp atw, i was thinking more about something I could use at 320atw but have the scope to go for 400+ atw if I decided to go for a built motor etc.

problem with a gt35 is that you need to run the boost to get the numbers... make buggerall power at 12 but at 25psi you'll make triple

500atw is fucking stupid lol

[wilbo666]

What about a GT3076R?

Cheers
Wilbo

[Kedderz]

GT28RS will get you your power figure at around 18-20psi, it will also spool nicely on a 2.0L

[jonathan yee]

well in my opinion unless your gonna have full drag radials etc 400hp on a FWD is crazy if not stupid. but meh thats just me.

i dont think the gen4 3s will be happy revving to 8000rpm. with stock internals.

unless they did something drasticly different to head and rods, i'm pretty sure the standard 3s rods dont like high rpm. and i think you'd find that your torque/power will drop significantly before 7500 0r even 6500.

[Shifty]

I've seen an AE92 with over 400hp atw on the street, it was pretty silly.... but yeah even 300-320atw will be heaps and I'm confident that I'll say "what the hell was I thinking!?" even driving it at 320atw.

Regarding power dropping off I'd imagine that would more be a function of the turbo or cams rather than the ability to actually make power at those revs. I've had a look though and it seems as though redline is 6800-7000rpm or somewhere around there. No concrete answer though, but even still if I haven't even got 7000rpm then a GT35 is completely out of the question, as Wilbo said a GT3076 is about as big as you'd go.

I will keep an eye out for GT28/30 variants around Christmas/New Year, someone will be selling cheap no doubt.

well in my opinion unless your gonna have full drag radials etc 400hp on a FWD is crazy if not stupid. but meh thats just me.

i dont think the gen4 3s will be happy revving to 8000rpm. with stock internals.

unless they did something drasticly different to head and rods, i'm pretty sure the standard 3s rods dont like high rpm. and i think you'd find that your torque/power will drop significantly before 7500 0r even 6500.

[chris davey]

I would think a gt3076r would be about as big as I would want to go on a street 2L. They are pretty much perfect for an 8.5:1 CR 1j so should go well on a 9.5:1 2L. They come up cheap pretty reguarly too. Even the .63 housing one would make 320hp easy and should have a margin to make around 360 I would think.

[RONA]

Stock limiter on the Caldina is 7000rpm FYI.

[jonathan yee]

[QUOTE=Shifty;1076448]

Regarding power dropping off I'd imagine that would more be a function of the turbo or cams rather than the ability to actually make power at those revs. I've had a look though and it seems as though redline is 6800-7000rpm or somewhere around there. No concrete answer though, but even still if I haven't even got 7000rpm then a GT35 is completely out of the question, as Wilbo said a GT3076 is about as big as you'd go.
QUOTE]


yeh... that's what i meant when i said head/rods. unless very diff from gen3 the cams wont make power over 6600, even tho redline on all 3sgTes are around the 68-7000rpm. put power drops of significantly before then.

so cams won't let you make power and rods wont let your engine turn over anymore as they will fall apart with constant high rpm.(that's my understanding)

the rods can take a beating with high psi(better if shotpeened) just not high rpm.

[Joshstix]

My 3SGTE with GT35R running 9:1 ish compression with oversize valves 268 degree cams etc makes full boost at ~5500rpm with a .82 rear housing, which is a lot smaller than the shit that you get on an XR6 turbo. If you're sticking with a stock top end and a 7500rpm or so redline I'd say go for a GT3071 or GT3076. The extra area under the curve will make it a far more fun car to drive with more power in the revs that are actually usefull on the street, assuming you can put it to the ground.

Don't get me wrong a GT3582R is a perfect match for the right 3SGTE but it requires a built motor that can flow significantly more air than stock and hang together at higher revs than a stock setup. If you want to go for the GT3582R and not be making the car significantly slower than it should be you'll be looking at needing bigger valves, cams, springs, bigger injectors at a minimum. Then it's a matter of waiting until it pops a ringland, which it will, so you can build the bottom end with forged pistons and rods or get the stock rods ground peined and balanced if that's you thing.

Take a look through http://www.toymods.net/forums/showthread.php?t=23312 to see what kind of power people are making with other setups and see what you think would suit your needs. For example my dyno graph over there looks like:



It's not really that controllable in a mid rear engine setup let alone what it would be like in a FWD.

Don't fall into the trap of going for the "bigger" part because it's only a few dollars more. Make sure you pick the most appropriate parts for the use you're going to give them otherwise you will end up spending the same or more money to get a slower, less fun and less satisfying result.

[Shifty]

All sounds fairly logical to me. I was only thinking gt35 as i assumed i had close to 8k to play with, hence larger area under the curve... but if i'm only going to be majking power to 6500rpm then a turbo like that is a waste of effort. gt30 would be about bang on. i see one for sale on here but a but out of my price range at the minute.... will do some other stuff and see how much money i've got when the time goes.

[SillyCarS]

GT28RS will get you your power figure at around 18-20psi, it will also spool nicely on a 2.0L

yes! yes! oh god yes!

[SillyCarS]

What about a GT3076R?

Cheers
Wilbo

oh and have this on my 2L 1g (6 pot). should be tuned soon so ill let you know how i go for power

[jzk25]

GT3071 with .8 housing would be plenty big enough. I'd also consider a TDO6SL2 - 20G.

Mount it like this.