Shadowen

iTrader: (6)

This is good information to know. I'm new to the IS world, lol.
With that said, the OP should still be clear to boost. When someone comes on saying, "I'm only looking to boost 6-7psi" they mean that they are just looking to turbo and run a safe amount of power. They don't really have a goal in mind for HP. So, more or less, just to have a turbocharger.

Justin727

Most probably don't know how to read a flow chart either..

But I believe a 60-1 turbo paired with a .58 hotside should be plenty for the goal the OP is looking for and I would run this as well. May end up boosting the ge or doing the GTE vvti swap myself.. Still putting the pieces together in my head.

Shadowen

iTrader: (6)

I'm in mid GTE build on my SC and due to it being a bit more expensive then I imagined, I'm at a stand still till spring.

Justin727

I agree. Building my Supra was on the expensive side..
Now I'm trying to get the pieces together to boost the IS and kicking around some idea's without it being an extensive process. The auto tranny is the thing holding me up. I want to retain it because the Supra is a stick and that's the fun car but I don't want to spend a chunk building a bullet proof transmission that I don't plan to push more than 400 thru...

ais300c

I just got another ge motor, what I've found out is building the top end will be all I need to run a solid 10psi DD I've already replaced basicly the whole top end with after market internal did a port and polish with some guys at car quest and I'm on my way. Thx for the opinions they helped alot in my decision to do this thing, one more thing I need to kno haha how's the auto tranny in the is? Is it a solid build or do u guys think there wil be issues?

Justin727

If you took some time and read my post above yours then you would get an idea of the auto tranny. I wouldn't trust it without some modification. 300-350hp @ the most.

You can spend between 3k-5k to have it built.

Shadowen

iTrader: (6)

Think of it this way, it's not going to break right away unless you're pushing 300+. But, the more power you add, the higher the chance for something to fail as well as the sooner things will wear out at fail.

Justin727

Right.
I was leaning more towards a 2jzgte VVTi swap and of course as soon as its installed, It'll have engine management, FMIC, Downpipe, and exhaust, and that'll net over 300hp closer to 400.
Even with the VB upgrade and an external cooler the sprag will eventually die. BUT knowing this has actually kept me away from doing that paticular swap and have thought about just doing na-t.
Who knows I may throw something together over a weekend or I may not...

baadhabit

iTrader: (2)

building the top end? where do you get this information from? building the top end cant hurt but not necessary. i dont know who told you needed a port and polish and upgrades valves and whatever. for 10psi you only need an upgraded head gasket and APR head studs. GE head is plenty strong. since you already have the motor out of the car and blowing money on port and polish you might as well build up the bottom end and turn up the boost.

the auto tranny on the ISs is stronger than the manuals. for boost you'll need at a minimum the valve body upgrade. then depending on your HP goals you can build up the clutch packs and 3rd sprag. i would talk to a shop like SRT or PFS and ask what HP the auto plus valve body upgrade can hold.

Justin727

Good info. I've already emailed Mo just awaiting a reply!