yea 25psi will rip the hell out of stock internals.

 

gt28rs, now that is a nice turbo. i was lookin for two of those for a tt setup for my car a while back...didnt work out tho.

 

Man u guys are doing this teh hard way

Use your ss/sc manifold and get an adapter plate made to mate ur tb to the top of the intake mani and find a smaller belt. RIU did on their solstice

60lbers are fine...I'm at 72%idc on mine already...if anything id go bigger but the hpt/gm map for injectors only supports up to 63.49lb/hr

This eliminates intercooler routing issues and give u an efficient base to start with

also note that twincharge had to switch to a copper head gasket and studs around 23psi cause the gasket was blowing out.

I'd run a used holset hx35w and will be when i run my twincharged setup...i personally think twincharging will be the way to go...instant response and low end plus screaming top end

Dan

 

your car is going to be hard as hell to launch on street tires dan, but god damn that thing is gonna be a beast. how far are you going suspension and drivetrain wise to keep traction? You should def. get a locker if you havent already thought about it or bought one.

 

I know a pretty decent amount on cars but what I do not understand is turbo 'trim' levels...can anyone help me out in this stuff?

 

it's the size of the compressor if im not mistaken.

 

The trim is referring to the compressor wheel...I think that's what you meant but just thought I'd clarify.

 

low compression pistons and beefier rods are your friends

 

already int he plan, i placed my order on a gt30 bb today, so i have made one step next is my intake manifold, and exhaust nexta nice 2.5 ionch air to air intercooler, man so many parts, right now to run efficiently at about 17 pound si should be around 2500 built and installed, pistons is my plan for the winter

 

yea sorry, wasnt specific enough.

 

why go low compression for race purposes?????? high compression makes more power per psi, it s just not as safe knocking wise.

 

Changing your ignition timing would help the knocking problem as well

 

gt35r here i come.

 

Your crazy bro! That's a damn big turbo, but good luck with it!

 

yea unless you are going with diff internals you aren't really going to be able to justify that turbo. A smaller turbo will spool faster and still meet your boost requirements unless you are redoing your internals and running massive boost of course!

 

So what turbo would give me around 20psi of boost?

 

http://www.turbobygarrett.com/turbob...472560_15.htm\

BAM!

 

Lol you and your GT28...

A certain turbo wont "give" you 20 PSI, its not like a pulley. Turbos have something called a wastegate that bleeds boost so you can run whatever boost youd like *and a boost controller hooks into the wastegate via a vacuum line and allows you to control the wastegate*

 

well it's pretty much perfect for your engines imo for what i would want from it. The gt35 isn't gonna flow right for you it's way too big. Smaller than a 28 and you may end up upgrading in the future which is just a waste of money. Any larger than a 28 and you are going to have more lag and you really wont be better off power wise. of course this is only perfect for what i would want from the 2.0 if i had one, but you need to consider exactly what you want from the car. Hell you actually may want a bigger turbo that makes higher peak power and accept a little lag so you have a monster from a roll. Or you may want a smaller turbo that spools very fast but wont give youa s much peak power because you want to autox or something. For me, i like to balance the two, and that's the way i am going with my turbo kit in the future, but really consider exactly what you want from the car before you make any decisions because a gt35 is not going to satisfy you imo.

 

are you looking for the fastest et's you can possibly get (what et's do you want if so)? or are you looking for response and autox type power that is always there and powerful, but not quite just drag power? what exactly is your perfect setup? this would make helping you decide alot easier.

 

I just want a turbo that will give me around 20psi of boost and has little lag. I don't want to have full on instantaneous power like I do with the S/C, the tires just won't stick. Something to have a nice low 13 second daily driver is all.

 

Any turbo will give you 20 psi, you're just thinking in the wrong aspect of things. It's not the PSI that necessarily matters, but how fast you're able to spin the turbine. The smaller a/r turbine, the faster it will spin. So when people are like "yeah, I'm gonna get this mega huge turbo"...how useful is that gonna be realistically? With turbos, bigger isn't always better. You want something that will be suitable throughout MOST of your powerband and isn't going to take you most of your powerband just build up the amount of boost you want.

Think...do you want a turbo that will be at 20 PSI at 5 grand or a turbo that can reach 15 PSI and continue to climb at 3 grand? Key is you want the most useable power, not necessarily the more peaking power.

Hopefully that makes things a bit more clearer.

 

Also, 20 PSI from a large turbo will react CFM wise much differently than 20 PSI on your supercharger, just remember that.

 

hmmmm... you aren't going to have the instantaneous power of a roots style blower with any turbo setup really, until you get into extremely high-tech tt or single turbo systems. low 13's could be done by most of the garrett 28 series turbos. you may actually want to go to a 30 if you want a little lag so you dont break the tires loose so easily. Really, just dont go too huge. i would actually reccomend doing this- there is a greddy dual stage boost control system that can be used on the profec a or profec b and some of their other boost controllers. Now, greddy sells a steering wheel mounded switch that lets you switch between high and low boost. This would be a very good idea if you want to go with a faster spooling, smaller sized turbo because you can be set at low boost thru first gear and switch to high starting in second or whenever you want, so it is easier to launch, but you will have that extra power.

 

My dumb ass would forget to flip the switch when I shifted. So you think a 30 series turbo would give me the HP to run a low 13? I'm not looking to build a 1/4 monster. My goal is keeping stock internals have the car putting out around 300 HP and running low 13's and if God smiles on me maybe a high 12 every now and then. I was waiting on Hahn to release their kit but it doesn't seem like it will out soon. I'm thinking I'll just get a SAAB turbo manifold and go from there. After doing a ton of research and asking even more questions.