chevyrules85

iTrader: (3)

i have a 93 reg cab short bed s10 I plan on converting from a sbc to a 5.3 with a th350 or 400, and a 9inch.

ive found a decent 5.3 around me that im going to pic up. ive been reading a ton on this subject, and ive gathered that it would be in my best interest to do ls9 head gaskets and studs. do I really need to re-gap the top rings?

ive never build a turbo motor, but have built several n/a motors. was looking at speed incs tu cams. would the tu2 be to big for what I want to do? id really like the lope from that cam, and someday may build a 408 or something so the cam could carry over. but would it run ok in a stock cube 5.3?

as far as turbos go, im kinda lost. most build threads ive read guys running s400's s475's s480's tc78's 76gts's. what are the differences? im most likely going with a single turbo since twins would be hard to package. I can build the whole hotside myself, im decent at fab work.

ill be running this with a ms1/msd6010. guess im mostly asking advice on prepping the motor for boost, and cam and turbo choices

I know this has been asked a lot, just new to the whole forced induction thing.

oh yeah, im hoping for 700 or so rwhp. but the drive train will be build to handle 1000+. thanks guys!

T76s10

iTrader: (6)

I can tell you that both the Borgs and twins are kind of a pain in the *** to fit. Say goodbye to inner fenders and stock cast manifolds (Atleast on driver side unless you put a universal joint in the steering shaft). The turbo depends what you wanna do with the truck. If you wanna drag it then go with the 475. If you want it to spool fast and rev low then go with a 7675 or something of that nature. I got ticks stage 2 turbo cam for my 5.3 and it'll still have lope. I think the tu2 might be a little big for that motor but I don't know cams that well so don't quote me on it.

Super6 N GA

iTrader: (8)

i have a build thread on theturboforums i am doing a 91 s10 5.3 t56 with a 7675 turbo. i am keeping the ac so things are tight. the 5.3 has ls9 head gaskets,arp head studs,lil john turbo cam,and ported 862 heads. i ran my crossover under the cross member using some shorty headers. i am leaving it at stock ride height so i am thinking it should be fine......Bob

chevyrules85

iTrader: (3)

i already planned on ditching the inner fenders for more room, this will only be a weekend truck, no rain, never in the winter. truck will be built for 1/4 mile. a lot of people seem to be fans of the precision 7675. what the difference between it and a s475? like I said I don't really know turbos yet. thanks for the help guys!

T76s10

iTrader: (6)

S475 is a t6 vs the 7675 is a t4. The s475 is much bigger. Turbine housings come in 83mm, 87mm, 92mm, and the biggest is 96mm with 1.32ar. The 475 will spool slower but make more power than the 7675. I'm going to run the 475 on my truck with the big 96mm wheel. A th400 with trans brake will spool it no prob.

chevyrules85

iTrader: (3)

hmm well im not going to run a tbrake, just a foot brake trans. where would that s475 spool up at? I want something midrange so I can still make good power on the street. any other imput on that tu2 cam? thanks guys!

T76s10

iTrader: (6)

You could look at the smaller turbine like the 87mm or the 83mm. Those will spool pretty descent

chevyrules85

iTrader: (3)

theres so many different borg turbos. borg seems to be what most guys here are running. whats the differences with the s400/475/480? just kinda confused

T76s10

iTrader: (6)

the s400 is the series. all their t6 turbos are the s400 series and their s300's are primarily their t4 versions. although for more money you can get s400's with t4 for extra. the s400's offer larger turbines and compressors for single turbos and s300's are smaller, typically for twins. the last two numbers are compressor size. s475 uses a 75mm compressor and s480 uses a 80mm compressor wheel. you base the wheel on the amount of power you want to make. I think s475 is 6 blade and the 480 is 7 blade. the 475 will spool quicker due to the lighter wheel. s400 turbines come in all sorts of sizes. exducers are 83mm, 87mm, 92mm, and 96mm. both 83mm and 96mm are the cheapest. the 87mm and 92mm cost more. hope that clears it up haha

chevyrules85

iTrader: (3)

that clears it up very well thank you man! a lot of turbos ive seen are even on sizes, like precision 7675, 76mm compressor, 75mm turbine. why are the borgs turbines so much bigger? like an s475 with a 96mm turbine? what would be the advantage to that? just curious. if I used the s475, with say the 83mm turbine, how late would that spool with a 5.3 basically stock with a tu1 or tu2 cam? would the 475 also be a decent turbo for a built motor? say a 370 or 408? thanks a lot guys

cpolaris502

iTrader: (2)

Good questions. I just a learned a lot myself from this thread. Thanks.

T76s10

iTrader: (6)

borg warner advertises their turbine wheels with the inducer dimension which is larger than the exducer. precision advertises with the exducer. so in reality, the borg turbine wheels are not as big as you think they are. borg warner were originally designed for diesel engines so they have smaller compressors and big turbines. bigger turbines are more efficient and have less backpressure on an engine which in return will make more power and pull harder when backpressure gets high (high rpm an cubic inches). good for drag racing where once you spool its always spooled and your always in high rpm. on the street if you want more usable power throughout the rpm, you will typically run a smaller turbine that will spool quicker but it will have more backpressure in which will suffer up top vs. bigger turbine. first thing is pick a turbo that will meet your crank hp goals. next is choose a turbine best suited what you will be using your vehicle for and how you want it to drive(street only? track only? both?). that 83mm turbine will spool plenty quick on a 5.3 with a descent cam but when you increase displacement you wont be able to make as much power with it because that turbine will choke. I suggest you buy once if you plan on increasing engine size.

chevyrules85

iTrader: (3)

what that explains a lot about the borg turbos. whats the quality like on the borg vs the precision and turbonetics stuff? seems like everyone here is running borg turbos. im gonna look harder into the s480, seems like that's my best bet

LSFreak13

Twins are nice for a street vehicle. Space to put them is going to be tight. Just make sure you do a decent amount of research to make sure you get turbos that will spool fairly quick. And I'd personally try to make them fit under the hood. If you were to do a rear mount it would make it harder to spool them. But that's just my opinion. And another thing. I'd shy away from eBay turbos because you never know what your gonna get! Lol.

T76s10

iTrader: (6)

I have had luck with on3 turbos and cx racing turbos too. ebay turbos wont fall apart on you they just don't have as good as wheels and design as the higher dollar turbos. they may not make as much power size for size with precision, tnetics, borg, comp etc. but at the end of the day they do last and they do work. borg are turbos that come oem on diesels so the quality has to be good to meat standards. they make great power and last a long time. precision has had a bad rep. I hear its hit or miss. some people love them and some people hate them. on a 5.3 I don't think theirs any point in paying $250 more for the 480 when that turbo will make over 1000whp. the s475 will be plenty for that size engine.

chevyrules85

iTrader: (3)

S400SX-75 ETT that's the turbo id be looking at then, right? on forced inductions site its 649. that's the 1.32 a/r 96mm turbine. this would be whats referred to as a s475 right? the on3 t76 is like 400 bucks. id just as soon spend an extra 250 to get the better quality turbo, with more potential. haha t76s10, since you have a few s10 setups under your belt, will I be able to fit this thing in the engine bay of my 93? I think I can, but that thing is freakin huge! used to have a 7675 in my firebird, this borg is a lot bigger! maybe that s475 is a good bet for what I wanna do. with a 5.3, tu2 cam, victor intake and elbow, probably 3200 stall th400, think I could have a decent bit of boost by about 3500 rpm? and probably spin it up to 7-7500 rpm?

T76s10

iTrader: (6)

yeah ive had too many different turbo setups in my truck lol. apparently you guys have a little more room under your bays than the second gen s10's so I think you can definitely fit it. in my new setup I put my radiator in my bed to make more space up front so theirs less clutter and more room to fit whatever turbo/turbos I want. with the radiator still up front the best place for the s475 would be passenger side as far up front corner as possible. I would build your own forward facing headers like it did because ill tell you right now its the easiest and best fitting method for these trucks. your wheel wells will need to be taken out. next thing if you want to run a full exhaust you will need to reduce your downpipe down to 4" to clear between the frame and your tranny and make sure it doesn't hit your upper control arm. if you don't mind(in my opinion its not bad at all) dump your exhaust in front of your passenger side front tire. its quickest and easiest option and will solve headaches. intercoolers are a pain in the *** on these trucks. I had one in front of my radiator up front once and I had overheating issues and high iat's because it was so close. another thing you could do is horizontally mount your intercooler, ive done this a couple times and it works out good. if you have the option for e85 I would definitely run it and ditch the intercooler and add meth injection in for cooling because that's by far the easiest method. if your on pump gas I would do an air to water setup. air to air intercoolers would be my last option. you will need to solid mount this turbo because its so huge so get flex couplers in your hotside.

and yes that's the s475 that you listed. im not sure how well the tu2 will do on the 5.3 it might be ok but im no cam expert. the 96mm turbine will take a bit to spool but will be good for the future when you go bigger engine and will work out good in high rpm. you should probably see boost in the 3000-3500ish area. depends though weather its from a roll or your launching it. if you got a trans brake don't worry about it

red281gt

iTrader: (6)

Bringing this back!!! Quick question, anyone have a link or something from where people using the stock ls3 camaro headers for turbo headers?

chevyrules85

iTrader: (3)

in an s10?