65panel5.3

So as the title says, i am wondering what size turbos you guys think would be a good size for a 5.3 with z06 cam and springs, comp pushrods etc, bottom end is all stock. looking for around the 10-12 pounds of boost mark with maybe mid 500's at the wheels. this is going in a 4000 pound 65 gmc panel truck with turbo 350 and 2400 stall, 4.10 gears with 325/50/15 M/T's. ANY suggestions? budget build(as are most builds on here). info would be greatly appreciated.

Rossko85

iTrader: (11)

twin 67's with a .82 a/r with divided housings T3 maybe? billet whatever brand you go....IMO...try out some of that new ceramic dual ball bearing technology...

Compressor: 4" inlet and 3" outlet...

I know with PTE units right now you can get that size with a 900whp top off. You can get an H (4" inlet x 3" outlet) compressor cover which is Garret's sizing system for their compressors if I was told correctly....PTE branched off from them and uses the same...

good spool with the divided T3 housings...I would say T4 for a single set up obviously..but with twins...keep that exhaust velocity up...

65panel5.3

anybody else have an opinion? thanks rossko 85 for your input.

71 chevy

iTrader: (18)

For 500 to the wheel I would suggest t76 with .96ar or equiv

scoobysmak

I wish I knew but I was thinking about running twins on my motor as well. I won't have room for intercooler(s) so wonder whats the max boost I should run (I believe people were saying around 8 lbs but would rather ask than find out the hard way).

At this moment mine is an LY5 with stock everything (T56 transmission). I need to find out what cam would work the best but haven't gotten that far in my search before I ran across your post. I doubt I need 500HP to the wheels but it would be nice. I need to weigh it once my project is done but at about the 475HP mark I will get the boot.

Hope more people know the answer to our question. I will also look up the turbos mentioned as well. I thought about running a procharger but would like to keep my hwy MPG as high as possible (as dumb as that might sound) so turbos would be a better option at this point.

XtremeDime

iTrader: (16)

What car are you using that you cant fit an intercooler of any sort? Id recommend an IC no matter what the boost level, but I guess if you absolutely cant....use meth.

TurboS10

iTrader: (12)

58-61MM compressor 58-62mm turbine -T4 unless you don't mind redoing it later. I forget what size the buick turbos are, 55mm I think, they would be a good match for what you want also.

Blown06

iTrader: (32)

How would twin MP70's work?

TurboS10

iTrader: (12)

See how many twin 70's on a 325ish cid you can find........ They will go 8's on a 400cid. Single T76gts will do 900fwhp on a 331 and choke a 5k and 700rwhp on a 355. Back pressure is the problem.... Twin T61's (not MP's) flow very close to the same as a T88 at most all map points. A T88 will go 8's on 350-380 cid. Twin 58's don't look bad ***, but they will make plenty of power for the street.

65panel5.3

ya i was thinking in the realm of twin 60's, i want to keep the lag to a minimum since this will mostly be a street truck, twins is just easier for me in the plumbing department(believe it or not). im thinking of going with this intercooler. what do you think? ive seen it on a vette here on ls1 tech and it looked very nice.

http://cgi.ebay.com/FOXBODY-TRANS-AM...item20b2a3ac64



what about these turbo's ? i know they are dirt cheap but does anyone have any good or bad comments about them? are they in the right sorta range as far as sizing goes?


http://cgi.ebay.com/T70-turbo-charge...item1c17a0ec9a

TurboS10

iTrader: (12)

I hope your a member of TTF... Buy once.... and then go bigger! Not once and start over. No experience with ebay turdo's Don't want any either....

71 chevy

iTrader: (18)

i had twin t70s on my 325... lol ... until i found out I actually had a 293 not a 325. so I exchanged the turbos for twin 60s, which are far better suited for a 4.8 than the 70s. the twin 60s would also be good for a 5.3 but for the power level the op is looking for I would even consider two large t3 turbos for fitment purposes.

scoobysmak

The project I am working on will be something like this:

http://www.minitruckinweb.com/featur.../photo_01.html

I will not have that much room under the hood to begin with. I read somewhere that an inter-cooler really doesn't help you that much until you hit about 7-8 lbs of boost due to all the air you have to compress Vs how many more air molecules you get because it has a lower temp. I would prefer to run an IC as well just figure I would ask someone that might have done it.

At this point I might have to leave it alone but would love to run a smaller set of twins for that added kick in the paints. This obviously is not a track car and just plan to build it big from the start, I will not plan to ever change the setup unless it just doesn't work.

I admit I need a class in turbo's though, I know the T4 means what type flange it has and understand compressor and turbine wheels have different sizes but if there is a visual chart for my visual mind that someone knows about it might help me out (this chart would have a pic and have what it is listed under/beside it). I looked at garretts website but besides them telling me the size engine and HP it would put out, they have a bunch of options. I was looking at the following but besides the price would they be a problem:

http://www.turbobygarrett.com/turbob...R_739548_9.htm

ModularTurbo

iTrader: (14)

in my opinion..........

anything bigger than 57's on a stock motor would be a mistake...
BUT if you plan on a built motor in the future than I would do at 60's or 61's

call me

thanks for reading
Rob