Maverick2664

so i'm building a twin turbo 383, it will be a weekend warrior thing, it will not see any track time aside from once or twice in its lifetime, so i'm not looking for top end and i'm not looking for all out power... this will be a fairly conservative build, don't plan to use more than 10-12 psi, i would like it to spool pretty early, and i would like to keep it at or under 600 rwhp

ive done quite a bit of homework but i'm having some problems puting a final decision on what turbos to go with, i have it narrowed down to 3, hx35's, T3 super 60's, or TO4B/TO4E's... i can read compressor flow maps and have mapped out my engine with all 3 turbos and they all run right up the center of the islands, so i know i'm in the ballpark

now part of my shops business is performance diesels, specifically dodges, so sourcing hx35's is not an issue, in fact we have a pile of them on the shelf as we speak. while i haven't found any examples of using them on a twin v8, i see they are extremely popular in the tuner world on anything from 2.0L to 3.2L, from what i can tell they spool fast and flow very well

and both the T3 super 60 and the to4b/e can easily be found for cheap online and many different trims and a/r... my boss suggested the to4b specifically because he knows a few people that run them and beat the snot out of them and they've yet to fail, i guess they're a pretty durable unit... he says they're cheap and easy to rebuild as well

so i need some pointers, any of these better than the others? or does it just come down to whatever i can get my hands on easier?

feel free to recommend other units as well

thanks

joeblue83

iTrader: (8)

what are you looking for? If its not a track car of any kind what would you need 600rwhp for?? Just build a stout na 383, they can put out 400rwhp fairly easy and much easier to build

Maverick2664

well... why not? im not looking for "easy", im looking for "badass", im not the kind of guy that settles, and overkill is not in my dictionary... im not just another one of those guys that puts a carbed sbc in their car and calls it a day... theres not a whole lot of forced induction cars in my area, hardly any that are turbo, and i dont even know if ive seen one thats twin... and i would sure as hell be the only guy around with a TPI 383 TT 6speed in an s10

Orr89RocZ

iTrader: (20)

600rwhp is a BLAST on the street when it does hook up. The attention that a twin turbo V8 gets at car shows and such is worth the investment.

I use T4 flanged 60mm units from master power on my 401. Originally going to be a 383 i sized the turbos for that setup and then realized I should have gone bigger when I ordered the 400 block.

T4 T60 on my motor is 640whp on mustang dyno thru loose converter at 12.5psi. Safe tune. On a 383 I'd expect 600-630whp or so at similar boost.

IF you are ONLY looking for 10-12 psi, a 58mm-60mm wheel would work great. The Super 60's would be ok if they are in that range. Master power stuff in the 58-60 range would work great too. They have super 60-1's I believe that are on a t3 that could work ok, but I'd go with a .68a/r T4 housing. Then again, a T3 could work ok due to TPI having a diesel like powerband.

HX35 I believe is a 56mm wheel but on a small .55 a/r T3 housing? thats alittle small of a turbine housing for a 383 but only 10 psi and 600whp or less wont hurt you too bad, especially since your powerband is low. Back pressure would probably start to get alittle high, but it would spool very quickly and fit the TPI powerband for sure.

I dont know much about the T04b/E stuff. I think they are in the lower 50-52mm compressor wheel range which could work but I feel the other options are better.

Maverick2664

see thats the kind of response i was looking for

thats whats throwing me off about the hx35's, i cant seem to get a straight answer on them, ive heard and read everything from a .55 a/r to a 1.1 a/r... and the fact that they came stock on a 5.9l diesel tells me it cant be "that" small.. but i have heard of stranger things. actually i asked my boss about the hx35's yesterday, about why they work on small little 4 bangers when they were designed for a bigger 6 cylinder diesel, and he said because gas engines see higher cylinder and exhaust temps than a diesel does

ill have to check some of the ones i have at the shop, see what kind of wheels and housings they have on them

i never heard of a master power turbo before, ill have to look into them

so basically im on the right track but should go just a hair bigger? i want something around a 60mm wheel and a .63 a/r?

Orr89RocZ

iTrader: (20)

yeah thats the thing about diesel turbos, you need to measure the wheels and try to compare similar gas motor based turbo maps because diesels act differently than gas motors, so you cant just compare cubic inches and rpms. What makes me think they are small on the turbine side is so that they can spool up quick as possible since a diesels rpm range is to 4000 rpm max most of the time.

I think you are on the right track. If you go abit bigger in the 60mm-62mm range you will have plenty of room for growth in case you get that itch to go faster. I know I have. I ran 3 times down the track at 10psi and was like, ok that was kinda fun but lets get a manual boost controller and see what she's got. Its hard to say no to another 75-100hp when its only a simple twist of a **** away. Its nice to have a turbo thats large enough to support those goals.

master power is a popular budget turbo made in Brazil I believe. They seem to do well and ony cost around 550-650 depending on what you get and where you get it. The T70 is the most popular and is used on almost everything from imports to mustangs to big inch twin turbo LSx builds. They have a decent track record from what I'm seeing. you cant really beat the bang for the buck for a first time turbo build, especially when doing a twin setup.

Maverick2664

haha yeah i know what you mean, when i said no more than 12psi there was that little demon in the back of my head saying "but i wonder what more psi will do...." i will more than likely experiment with it, but id still dont want to go too much bigger, being a street vehicle id like to hang onto that low spool if i can

i checked out master power's site, they seem to be pretty affordable and come in just about any wheel and trim combo

they seem to be a pretty durable unit? no problems with yours yet?

Orr89RocZ

iTrader: (20)

Mine havent been out running very long, but I have had no problems with them so far. The main problem that you may see posted on the net is that they blow out oil seals. There was a LONG thread on turboforums about the master power survival rate and majority of people have had them last several thousand miles. Some had quick blow outs but all products have a few people that had problems. Every vendor is like that, always have negative feedback from some unlucky person that may have used the part wrong. Never know. I trust them enough to keep using them. When i upgrade to 70's I will get MP T70's.

Maverick2664

do you know if theyre easily rebuilt? i know some are harder/more expensive than others, like the garrett ball bearing turbos i hear are fairly pricey and require rebalancing

Orr89RocZ

iTrader: (20)

yeah from what I hear they arent that hard to rebuild if needed. the kits arent expensive and many vendors can do it for you for a reasonable price.