Thats why i was saying lower the compression ratio, gunns mill some off the pistons, and grind some out of the heads, putting the 7.3 cups in a 6.9 head from what i understand helps a bunch to get the CR down, im shootin for around 19-1, i believe gen 1 strokers are 19.5, may be wrong on that. Like snapon said about pistons tho, ive had the idea before, may do some researching on the hypermax ones, ive only heard about them, but it cant be impossible to find a set of forged pistons for a gasser that can be put in our IDI, or maybe it can, but i dont see why. Long as the wrist pin dia. is the same, obviously the bore, and the height, i dont see why it cant be done, unless anyone knows of forged aftermarket pistons for these things. Which no doubt has to be why the cummins can take the temps we cant, although i dont think they can hang at 2000* any longer than we can at 1400.

 

You should also fire ring the heads to help keep that gasket in there

 

The first gen. cummins didn't boost 50psi, intercoolers were not needed.

If its not crazy to run 50 lbs of boost on a IDI, why don't you do that?? You are shortchanging yourself by stopping at 30 lbs of boost. Not trying to be a pain but what you are saying just doesn't make sense. I would be crazy if I said you could run 50 lbs on a IDI - you can't and you wont, it just ain't gonna happen.

 

Im startin to feel like im being argued with for arguments sake... i get the same thing when i say im gunna have a 300hp IDI. Its not impossible, it just takes doin it. I COULD build my engine to boost 50 im sure, to what point? Like you said in order to do so would require lowering the compression to a point that you probably couldnt start it half the time. I dont need to run 50lbs, i think, to get the numbers im after. But to say something is impossible, well thats poor logic. Sittin 2 blocks from where im sittin right now, is a gen1 cummins in a 1990 dodge 1 ton that sees 65 pounds of boost about every time its started. It has an intercooler and i can garuntee the only reason its there is to make power, not keep egts down. Its a puller, do i need a puller? no, i need a DD with some yeehaw. Can i run 50lbs, yes, will I, no. Will it dyno 300hp+ it will, or i wont be done building it.

Think what you like, i am not crazy for building my engine how i want to. I was simply looking for other likeminded individuals looking to press the boundaries and think outside the box.

 

the thing about all them there 1000 hp 40+ lb boost cummapart is, they are as you said, pulling trucks.
put one of those engines on the street and see how dependable it will be before spitting its innards all over the pavement.

that is what i don't understand about the cummins crowd. they all want cazy hp munbers for a daily driver, and then freak out when it spits parts all over the place.

but it is your money, build what you want.

 

I'm not saying you are crazy for building your engine the way you want it, thats what I do. But when you say, 'well if a cummins can boost 50psi then so can I' it just doesn't make sense and is poor logic. I wish everything in life was like that - its not.

Don't know what to make of this statement, intercoolers give a engine more power by giving a cooler burn upon combustion resulting in lower egts.

 

You guys make it sound like im commiting genocide or something lol. Im simply saying, if you can build an engine, for instance, a cummins, to build 1000hp, and 60lbs of boost, then i can surely make my IDI handle a mere 30 pounds and put 300 horse to the ground. Im not gunna run 30 pounds because i like the number. From the figures ive been playing with, im going to have to make around that much boost to get the power i want, giving it enough fuel will be the hard part.

30 pounds of boost in a IDI decompressed to around 19-1 will be little different than a 22-1 6.9 running 10-12 pounds. Yet it will have about twice the airflow. Its not impossible, its math, and although mine may be wrong, the idea behind it aint.

 

Ok guys. I am not wanting to make big horse power and lots of boost. I just can't afford to buy a kit for this truck new and in my mind I hate to get something that is used and may or may not be complete or in good shape. I have done the research and priced to parts, and I have the skills to build a custom system and it will be cheaper. Besides as my sig says "Don't buy it..Fab it" lol. All the shops I have talked with say to go with tubing "I will use weld elbows" the same size as the exhaust ports on our heads. Feed these into a 2 1/4" log "here I will use 3/16" wall 2 1/4" id dom" and route this to the devided flange on the hx35w from either side. This turbo is rated for up to a 6.5l engine (inline six configuration). According to the pros, because of our higher compression ratio this turbo will will still easliy make enough boost to over do it lol. From my "maniflod" to the turbo the piping will only be about 14-16". This should greatly reduce lag and the smoother flow will help with this as well as lower the egts. For guys that want to go bigger, the hx40w is rated for 7.0-10l egines and would be hard to spool on the bottom end but would be awsome at the top. One mistake I may have made was telling some othem about my idea of a manually comtrolled waste gate. They seemed a little to interested in that one. I am telling you.. if it hit s market I will be a little POed lol.

 

At some point after all the machineing and replacing parts, you no longer have an IDI, and have a completely different beast (or burden) made from an old international block. IF your going to spend the money and want all that power and boost...buy a PSD or cummins and drop it in. Im all for getting every ounce of torque and HP out of my IDI, to a point. im going to turbo mine and install an intercooler and all that stuff too. If you want to and have thousands of dollars to make that beast something different, despite the fact youll need to replace it before 10k miles, go for it. Just my 2 cents.

 

I have an 88 with 97 000 kms. I rip on it all the time, I often have er up to 2200 rpm with a load going downhill. Never had a problem with it....mine will let some exhaust through before it builds too much pressure. Not sure if all brakes have this feature but would only makes sense as it's a good safety feature.

 

you can run studs instead of bolts on it, run the copper spray OR build a new gasket all together thats ment for the boost. you can also ring the heads and intake and that would handle whatever you wanna throw at it.
and as far as the honda, my neighbor ran 35lbs of boost on his oem bottom end for 20k miles including all the racing he did. never had any issues with that.

and to the post about not being able to fuel 30lbs of boost, thats not much of an issue. a good "built" moose pump or the DTS or whatever their name is would do most if not all. then anything other then that, run propane along with your 50/50 water/meth mix and you would be just fine.

 

my buddy wants me to buy his turbo from a 99 PS. How easy would it be to make it work on my 89 IDI?

 

Lota fab work but it can be done.

 

The issue with the PSD turbos it the wierd one off base they have for the oil drain and such, get yourself a Holset HX35

 

he was gonna sell it with the down pipe and turbo for 400. figured if it was an easy job id get it. not super into a turbo but it it worked easy id get it