proeliator

Ive been looking for days for some info and can't seem to find it.

Are there turbos that have a 4" output? can my 93 manifold accept newer turbos?

2 questions but I cant seem to find it, building my exhaust in a few days and it seems strange to run a full 4" system with a 3" turbo output.....
thoughts?

NotEnufGarage

I think an HX40 has a 4" outlet. Search the threads for HX40. I think some back pressure, or drive pressure as it's called in the turbo world is required to make the turbo work efficiently.

If your downpipe transitions from 3" to 4" right at the turbo, I don't think you'd see too much difference. The gasses are really hot at that point and moving fast. It's as they cool and slow down that the size makes a big difference.

proeliator

My issue is I would prefer to not use a standard elbow and downpipe because in my chevy conversion I have so much room and the exhaust for the newer trucks look like they are much closer to the angles im looking for and parts seem easer to find....

GLHS

You can get most any S300 series turbo with the hx40 style 4" flange.
Just buy a true 4" downpipe for a 2nd gen. It should work.
Yes, our 1st gens will accept any turbo the 12 and 24 valve 2nd gens can run. All 12 valve manifolds are the same (rectangular ports). The 24 valve manifolds have the same turbo flange; the exhaust inlet ports are different (round).

proeliator

seems like having a waste gate would be nice..

proeliator

The main reason im considering a turbo change is that this
#1 http://cgi.ebay.com/ebaymotors/Parts....c0.m245.l1318
looks like it would fit my truck a hell of alot better then the stock option
#2 http://cgi.ebay.com/ebaymotors/Parts....c0.m245.l1318

so before i shell out $150 I am trying to make sure I make the best decision.
From talking to you guys seems that my stock turbo is good for say 250 hp?
but if I want to go more then that its time for atleast a hx35
so I am trying to figure out what turbo the first link up there would fit and if there is a good option in that way for me to go with , since I have no exhaust at all to worry about yet and am starting from scratch. but that downpipe requires a much newer turbo.

Philip

If your thinking of going over 250 HP don't even mess around with a HX35. Go bigger the first time. No sense in buying two or three turbo's to get where you want to be.

A S300 or a HX40 requires a 4" down pipe. Both use the same flange setup. Our trucks use a T3 turbo mounting flange. On HX40's you can find them with T4 flanges off of other cummins engine if your looking in the used market. You don't want a T4 setup.

The S300's come with exhaust housing selection from 12cm, 13cm, 14cm. The base line S300 is supposed to support right at 400 HP.

The HX40's the smallest exhaust housing you can get is a 16cm. If you watch around ebay you see some listed with 14cm's on them. But I have never seen one and HTT says they don't have a listing for anything smaller than a 16cm. The HX40 is rated to support from 425 HP to 475 HP.

wannadiesel

If you just throw a big turbo on a stock engine it is gonna be a pig. The truck will drive a lot better with too much fuel than too much air.

GLHS

If your staying below 325 hp, I would say a PDR HX-35 or equivelent would be much better. S-300s are suited for 350 hp and up IMO.

Richie O

my base S300 is a super good turbo. I am sure that I am not even at 300 horsepower and the thing spools quick and no surge. I has the 4 inch exaust flange that is the same as the HX-40.

proeliator

It would be easer on me if everyone agreed
ok so here ill give more info about what im looking for.
most the time im empty this is in a silverado with diesel is about 5200pounds
auto overdrive tranny out of a 93( i believe) 1 ton dually I have a trailer that is a bout 6000 pounds i will be using 4 times a year and a 3000 pounder once a week, I do a long drive to work everyday along a highway where averae speed is around 60, I want this to have power if I want it but want it to be very efficent.

I am also converting to a water intercooler.....
Does this help?>

proeliator

O yes going to turn my pump up very soon aswell I have a jeep cj-8 I drive most days with a ramjet 350 =350 hp 400tq, So I am hoping this cummins wont feel gutless in comparision.

Richie O

No body is going to agree. We all like our way. There is more then one way to get there. I guess its a trail and era thing. See what works for you.

proeliator

Just had a friend offer me his 04 hy351 ......What problems would this cause as far as spool up and such?

Philip

That 351 is a variable gate turbo. There are no stand alone controlers for it. So rule that one out.

Turbo's threads are like transmission threads. Very few people agree. Another thing you haven't given us an idea of what your going to do for fuel mods. That makes a difference on turbo selection. Your trans selection makes a difference. A stick likes smaller exhaust housings and auto likes a little bigger exhaust housings.

Most of us that have installed 4" systems have seen at least a 100 degree EGT drop with no other changes to the engine. That is with 3" outlet turbo's.

Go ahead and build the 4" system. Reduce to 3" then when you decide on engine mods all you do is replace the flange and use what ever turbo that suits your needs.