hx35(w) vs hx40 vs s300
 

well guys my turbo is starting to make tinkering noises like its on its way out. according to the mods in my sig which is about all i will be doing power wise, which is the better or the turbos i can upgrade to. i really dont want to spend 1000 bucks on a turbo if i dont have to. what turbo and what size should i go after and the truck will be a 5 speed.

is it worth paying the 1000 bucks for an s300 or is a used hx40 a good route as well? and since its in a chevy, i dont have firewall clearance like the dodges do, so i need the exhaust housing not to be super long so it doesnt hit my firewall. any ideas?

Here is a good little read for deciding what turbo will fit your HP needs. As far as affordability, I don't know what to say. It sounds like you need a turbo asap. I've seen some awesome deals on craigslist for used turbos lately. If you could hold out at all and save up for an S300, I would. Good luck, pickin.
Selecting the best turbo for your application is a matter of choosing the right turbo for your intended power level and your intended

i think im leaning toward the hx40 due to the price. what size should i look for as for exhuast ports and whatnot. im thinking the 14 cm should be fine. but how about compressor wheel size and whatnot.

and also for an hx40 does the downpipe go straight down? or will it hit my firewall

I didnt have a cast elbow on my super hx 40 just so you know... I had to do some fab work but I made it a 4 inch down pipe. im sure you could do it better than mine but I was stuck with a 45* bend and some flexpipe to make mine work. and even then it was tight fitting

You can buy regular S300's rather inexpensively.
They just won't say HTT or the like on them.

BTI

and where would i find one of those?

and im not too worried about making a downpipe thats all easy stuff for me

I have a link on a diff computer I will look when I get with it.
Actually for a downpipe you may want to see if you can find a 1st gen Dodge truck downpipe.
They have a very sharp bend right off of the turbo.

BTI

not to make fun but thats why i ditched my stock down pipe, i think it would be a better idea to fab one up then put that kinked thing on. and from what i have heard the HX40s have weak shafts that tend to break under certin conditions, correct me if i'm wrong. I'm saving up for an s300 just seems to be a better turbo all around(and i have plans for twins one day and s300's make for a good upper turbo)

i would love to get an s300, i just cant afford to spend that much on a turbo right now thats why im leaning towards the hx40. and i know the sharp bend in the downpipe sucks but i think BTI was referring to when i said i have VERY limited room for firewall space and he is right. i dont have anywhere close to enough room to run a bigger downpipe.

as for the hx40 being a little weaker, they are also very easy to rebuild from what it looks like. is that true?

A regular HX40 has the same shaft as an HX35. They are by no means "weak." Have you ever heard of a 1st Gen breaking an HX40's shaft? Nope, me neither. The people who break shafts on HX40's are the 500rwhp P-Pump pulling trucks who have absolutely no buisness running one.

You have nothing to worry about running an HX40 on a 1st Gen. That being said, they also make "Super HX40's" which have stronger shafts, a 7 blade wheel and move more air than a standard HX40.

i will not be anywhere close to that power range. and no dyno runs for me either its just a driver. will any hx40 turbo work like one off a car, as long as its a t3 flange, or do i have to make sure it from a truck. are they all the same?

and also what about a he351 ive heard alot of good about those. whats th eplus and minus with putting one of those in a 1st gen. im moving a good amount of fuel and my turbo now just cant keep up

there is nothing wrong with an hx40 great turbo a 14cm housing is good i would at least try and find a 62mm compressor whell imo for your truck

Excelent point. Yes an HX40's weakpoint is the shaft, and I hear a lot of crap talked about that, but really?? Before the s300 became popular, HX40 was the turbo to have. For what you need out of a turbo, the Hx40 will do fine. You are pushing plenty of fuel to make that baby spool, and I have a hard time imagining you blowing up it up. As long as it is a T3 turbo, it will bolt on. Ricer guys take their turbos off our trucks and use them all the time.

The least expensive route to take is to find a local or close scrap yard that has big trucks. Then find a Ford L8000 series truck with a cummins 8.3L. That will have the hx40 you are looking for. Also find a vehicle with a c7 cat engine and that will have the s300 you could have! Thats how i got my s300. Had to fab a downpipe but i'm very happy with it. Much better than a holset IMO. Either way, thats the best way to get a turbo.

well i found a fresh genuine holset (not ebay emusa) hx40 locally for 280 bucks so i bought it. its 3 hours away so hes just shipping it to me i should see it on friday. its got a 16cm housing so thats cool because i tow as well and it also has a 4" v band so downpipe should be easy. hopefully itll still spool with all the fuel im pushin

good luck gotta tell us how it works out:tu:

will do. if anyone has a spare hx40 downpipe layin around let me know:c:

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anyone know if a hx40 is the same length, shorter, or longer than an h1c? judging by the pics they look about the same length. anyone know?

i have n hx35w with a 14cm wastegated housin and there longer than the h1c buy an 1 1/4"

thats going to kill me for firewall space. i tried winning a bid on ebay for a cobra head 4" flange that dropped straight down for the donwpipe so i can have room. anyone know where to get those?

i think source automotive has flanges..... don't know if any drop straight down tho

newbie
 

just readin through some hx40 posts.... i think i got what u need..... my hx40 came with the cobra style down pipe... it goes straight down off of the exhaust housing....has a clamp and connects right to the housing.....it ur interested cell 903 880 5621....ill make u a good deal:tu:

Believe he already went with a 62/65/12. This is a pretty old thread.

On a 98 12v auto... Would u do a 62/65/12 or a 62/68/13 .... Lookin for something to go on top of this 75mm s400 ... It has a 1.32 a/r

How much fueling do you have? Plate, injectors, DV's, etc.

I would put my vote on the 62/68/13. The 65/12 should work fine, but the 68 turbine and 13cm housing should help flow out considerably, especially if you're running a considerable amount of fuel.

For now 17* timing, 3k gsk, 370's, 16cm t3 flanged 60/60/16 hx40 or something close, #0 plate, afc tight , valet switch

Either one will work well, but I would go with the 62/68/13. Heard good things about them.

Let me know how you HX40 worked out! My truck is getting a new turbo when I get back to the states, and I'm also torn between the s300 and HX40

It really just depends on how much fuel you're running and how much power you're going to want. the HX40 is pretty much one set size 60/60/16 or so, while you can get an S300 is a variety of sizes, anywhere from a 62/65/12 and up.

Bringin up old post here but my set up is almost the same as doc holidays but with stock 35 turbo an when I step in to it it sounds to b over fueling an takes for ever to spool up with bunch of smoke what would b a good upgrade turbo for me looki g at 400 hp range mayb tad more an should that fix my bogged down turbo problem

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An should that wake it up preatty good n give it good power kinda new to diesels

definitely the 40

im late to this but an hx35 and hx40 have the same size shaft. they are rebuilt with the same rebuild kits. hx30,35,and 40's are all the same. the difference is the wheel size. an hx40 has a 65mm turbine and a 60mm compressor. this buts more stress on the already small shaft. they work but fail often because of there small shafts. ans s300 base turbo is a stronger better upgrade all the way around. it is much more expensive but its a better turbo. and ide be in the 62/65/14 range on a charger for you.

It doesn't really matter which series you have, 35 or 40 if your turbo is barking, you have a ticking bomb.