TorganFM

I thought it was more of Ford squeezing way too much out of the small stock turbos making them blow hot air and that causes problems. And that was only in the recent Powerstrokes....

HomeMadeTurboz

I gave you two good options for turbo upgrades. The holset HX35 has been taken to 450whp + albeit a hot 450. and the S300 57mm has been run to close to 500whp again rather hot. Either one of these will give you more then enough turbo. You should also look at adding a powerstroke intercooler, or w/m or both. Be careful with w/m as that will pop a h/g fast and bend rods if you get too much in there.

You said top end sucks, are you hitting the gov?, and it is pulling back fuel? Are you cleaning up all the fuel you have on the top end? What RPM are you dropping off at? Need more info.

HomeMadeTurboz

Small H1C isn't going to gain you much over what you have, the big H1C, still wouldn't be worth the hassle. I think the HX40 would make you power band even narrower then it is. By the time you got it lit, you would be done, that and I don't think you have the fuel to support it. This is why I said an HX-35 with a 12cm or 14cm housing.

E-b0la

21.5 c/r is not a big deal. All diesels have high c/r's like that so it's not really an issue. You make it sound like your risking detonation or something.

But if the head gaskets are going to blow they're going to blow. So either leave it alone, or crank up the fuel and boost, blow them and replace it with a better unit and stronger head studs/bolts.

If you want to play with the timing learn how. I don't know how but I'm sure there's material out there on how to adjust the injector timing.

con

really I dont remember it having the pistons and rods but that would make sence. As for a turbo I would run hx35 and call it a day. I dought you will want to spend the cash to ever max out that turbo with that engine.

HomeMadeTurboz

Iirc the pistons were oem, but cut, but the rods were billet. It really came down to the sigma pump, and big jd sticks.

Obscene_CNN

Actually on a diesel adding more excess air does increase the power output of the engine. It does so by increasing the engines efficiency by putting more of the combustion heat energy into the working fluid instead of the cylinder walls. Its one of the reasons people add intercoolers to diesels. As shown in The Diesel Reference Handbook 2nd Edition (see attached image) increasing air in the cylinder by about 12% increases power output by about 4% for the same amount of fuel burned.

Gale Banks, who has made a fortune hot rodding diesels, says the first rule of increasing performance on a diesel is to add more air. Once you have more air then you can look at turning up the fuel. Which in the case of the example posted was about a 20% increase in power. So ghunt is on the right track as far as looking at a turbo upgrade.



Looks like you need to hit the books too dvst8r. :1

Now that school is over.

Ghunt,

Your best bet is to look at a VGT/VNT turbo. There are guys hot rodding their Mercedes Benz IDI diesels that say this is the route to go. You can find a bunch of them here http://www.superturbodiesel.com . They can also tell you how to make it work without a computer. They have a list of turbos that might be helpful found here http://www.superturbodiesel.com/std/...ead-t-235.html

dvst8r did have good advice as far as looking to add an intercooloer. Also make sure you have a free flowing exhaust and a free flowing intake.

HomeMadeTurboz

Well a couple things here:

1) The turbo on the truck is capable of more air then it is providing.

2) I have gone from a single turbo setup to twin turbo setup, increasing the air by nearly 50%, and went from 490hp and 995ft.lbs, to 492hp 1095ft.lbs these were dyno'd on different days, but all the settings where the same. So despite adding a bunch of extra air, NO power was found. The extra torque was found from going from a medium single, to a small secondary and a med-large primary. So the secondary lit quicker then the former single, therefore the ip was able to add fuel sooner bringing up the cylinder pressure. Extra air no extra power.

3) I ran a vw 1.6 at 24psi on a t3/t4 50 trim .63 hotside. Made 199hp, ran the same setup, same day, same dyno, never unstrapped, just let it cool off some (we were trying to break 200hp) ran it at 30psi and made 194. LOST 5hp. I believe this to be that there was not any extra fuel to burn so it was taking more energy to run the extra psi (more shaft hp needed) and as such was wasted. Extra air no extra power

4) The intercooler would have two functions adding air density power if there is available fuel to burn, as well as keeping egt's in check, when pulling, or running hard. My current setup will wrap an 1800 degree pyro in less then 10 sec WOT. That could use more air.

5) Once you are leaner then the smoke thresh hold you have very little excess fuel and as such adding air is not going to give you much of a boost. If the OP is all ready running clean the expense and effort of doing a turbo swap for MAYBE 10hp is hardly worth wile, especially if he can just put a mbc on the turbo he has and add the extra air.

6) Here is a dyno of a 7.3 idi with added FUEL and TIMING (via adjusting the stock IP) on a STOCK turbo (stock output shown as well):
Anymore then this and as is well known to the OP and to 7.3idi owners you blow head gaskets, and need to run studs. Extra Fuel and Timing, extra power.

Finally, Obscene_CNN my EXPERIENCE owns your search button knowledge. :1

con

Gale Banks is an idiot, anyone who mods diesels laugh at him. My truck ran circles around a full power pakage with just a custom programed sct and exhaust. I'd hate to see what my truck would do to it now.

HomeMadeTurboz

I agree completely, Banks kits are for the guy with too much money and not enough brain. They have built some fast corporate trucks with outside help I might add, but their consumer kits are a waste, more marketing hype then power.

My old beat up 12v, with FREE mods (turning up the fuel, adjusting the timing) would smash most banks kits. Obscene_CNN is right, Gale banks has made a fortune adding very little power, and charging a $$$$$ ton for it.