well i have everything i need for my build except for the most important part the TURBO.I was set on buying a t61 but after futher reasearch it seems this is gonna be kinda large and will be really in efficent at low boost levels.hoping maybe doward or sixshooter will chime in here with recomendations on a good sized turbo,as im really confused with all the compressor maps and such.
i want to run about 14psi,but during the first bit of it being installed ill prolly only be able to run 5-7 psi to get the tune and everything striaghtend out,and slowly increase boost from there

 

Need ALL of the details of the engine, if a part is stock list it.

Daily driver?

Daily driver weekend warrior/

Race car that see street duty?

If racing, what kind of racing? Drag, road, toilet bowl, etc.

Tranny, rear end gears?

I'm pretty sure I know how you're going to answer most of those questions, but need to hear it from you, before recommending a turbo size.

 

ok first off its a d/d right now,but im looking to build it as d/d,weekend warrior for now,with the possibility of turning it into more of a drag car that sees limited street use.
as far as racing type its all drag racing
as for the engine its
stock block/crank/rods(rods have arp bolts)
new rings/beariings(main,rod,cam)
pistions im still looking for aftermarket forged,but there stock as of now(limiting boost level)
stock but ported polished heads(roller rockers)
thicker copper head gaskets(should drop compression 1 p)7.9-1/8.0-1
stock cam
gasket matched/ported intake with modified upper plenum(tpi plenum/v6 runners/v8 throttle body.
injectectors from 3.4l engine(dosent really matter will buy larger if needed)
adjustable fmu
new v8 tpi pump/prolly a 255lph
one off turbo manifold
3 inch spintech ex system no cat(basically a v8 tpi ex system)
36 mm wastegate
to atmosphere bov(prolyl going to exchange for a bypass type valve)
msd btm/w msd coil
swaping back in 700r4 with 3000 stall converter/4:56 gears in rear(may swap back to a lower ratio
2.8L/maf system

 

can't really help out but i would like to ask about your arp rod bolts, did you use the arp bolts for the 2.8? i always assumed since the pistons and crank were different that the rods used different sized bolts.

i guess i was wrong, would love some clarification

thanks alot

 

the rods for the 2.8/3.1/3.4 are all the same

 

PLEASE, PLEASE do NOT drop the SCR that low, it is a band aid way of combating detonation. With better tuning and teh use of EFI that low of an SCR is only asking for drivability issues. Remember, when you're not accelerating, you are in vacuum, and you will still want an efficiant burn to keep the emissions down AND increase economy.

A higher SCR will also help spool the turbo quicker than the same engine with a lower SCR. The high SCR helps accelerate the exhaust gasses to a higher velocity than a lower SCR.

Off boost drivability will be better and more enjoyable with the higher SCR as well.

With the Iron head, I wouldn't go any lower than 8.9/9:1 and depending on other factors, I probably wouldn't go higher than about 9.4:1 while being DD.

You'll probably be changing the set-up out as time goes on, so I don't know that I would concentrate on what you need in the end now, as much as I would later. Basically using a turbo sized for all out drag racing on a DD now with essentriall a stock engine, over a fully built engine later, won't be very enjoyable or make much sense. So I see at least one turbo swap out in teh future.

That being said, A T3/4 hybrid, that uses a V-trim compressor and about a stage III turbine with a .69 or so turbine housing will probably make for a very enjoyable DD with the WW ability.

I used a T3 from a turbo coupe, much smaller, and while it was ok, I really did want a larger turbo, not for more boost, but less heat in the intake charge.

Check out the Turbonetic Turbo matrix for a ball park on turbo sizing.

 

thnx man,everything i could find was telling me i needed to drop the cr down to atleast 8.5-1,and that the lower i went the more boost i could run,ill hold off on thos ecopper head gaskets for now,but do u think i should go out for a stock thickness set of copper gaskets,or will a set of reg felpro gaskets hold up,if i cant find a nice set of forged pistions,i already know 9 psi is prolyl gonna be my limit,yeah ur right about this motor going to be built up more,this is just to get me started,and things will be upgraded as needed,do u see anything that i should change up right away???

 

ok just looked at that turbo matrix and i was pretty close when i was gonna get the to4e 50 trim.48 a/r,that will support upto 300 hp so i quess ill get that for now.And anyhting over that looks like its only a wheel or housing upgrade cause there all listed as the same turbo with diff stage wheels and diff a/r housings,since u have done this before u would know a lil better then me the kind of power this thing can make.

 

dont have the BOV vent into the atmospere with a MAF, it may trigger a code 34 or somthing, im not 100% on it, but i remember reading it somewere

 

redbird what ive read is 50/50 on a to atmosphere bov,most things say of the turbo wastegate/and bov open and close at the right times,that th emotor wont go rich when the bov vents,im willing to take a shot at it,im one for a sleeper,but i do love the bov sound,and hearing it comming from a 3rd gen camaro would really turn some heads

 

ok, well, at least now i know im not crazy for thinking that, i agree with the sound, especially from a 3rd gen