you sure your wastegate is closed up? no exhaust leaks? I would think it would spool up quicker, but no experience w/ the powerband on those engines.

Forrest

 

it only had 4 psi boost till i discovered that i blew the intercooler boot. after that it was making 14-15 psi above 2500, and the powerband is supposed to be around 1400-2500. but i can only make like 5 psi boost in that range. and it surges at low rpms, like in 2nd gear putting around, its kinda surges"i guess it's called surging" the boost guage will flutter between 0-2 psi boost. not a fast flutter but about 2-3 times per second.

 

and i know i have an exhaust leak because i can see it smoking around the turbo flange. i will put some different gasket material in there and see if i can't slow it down a lot.

 

Glad to hear you got the drain problem solved.

The turbo gasket is supposed to be stamped steel. It's got a raised bead that gets crushed when tightened, that's what seals it. That's what you'll need to get it leak free.

The old IDI pump doesn't have any way of adding more fuel as the boost goes up, so getting it to spool quickly will be problematic. I'd suggest you look for an HY-35 turbo, those have the same compressor section but a smaller turbine housing. That should get your turbo spooling at a lower RPM and really smoke that clutch! The HY-35 will bolt in place of the HX-35 with no mods to your setup, and they can be had cheap because they're too small for a Cummins. You should be able to sell your HX-35 for more than an HY-35 will cost you.

 

thanks for the great input. will my intake pieces work fine without modification as well. i got the stock dodge elbow coming straight off the turbo with an intercooler boot, hooked straight into the motor. hot-air international!!!!!! and what year do i find the hy35's on??

 

HY's are on the '01 and '02 auto's. Guys pull them off all the time to put HX's or hybrids on because the HY's tiny 9 cm exhaust housing is too restrictive. It's a direct bolt it, no mods required. If the HX fits there, the HY will fit like it grew there. If you have an old style HX without the cast on exhaust elbow, you'll have to swap backplates between the two turbos, then it will bolt in.

 

i have the hx where the exhaust elbow is held on there by a clamp. what do you mean by "backplates" ? is that the plate on the exhaust housing that when you take it off, you can see the little flapper thingy to the wastegate? if that is what you are talking about, then it's all fine and dandy, since i don't have any exhaust after the turbo anyways...

 

Yeah, that's the backplate. The HY's (and later HX's)have the exhaust elbow cast into the backplate.

So if you don't have any exhaust how do you see around your own soot cloud?

 

i have to clean the windshield after going twice around the block. and the top of the cab is covered in black

 

 

i have an old non-wastegated banks sidewinder turbo and thinking about adding it for a twins setup. the banks turbo is smaller, and i need to know which turbo would be first in line on what side. or does it matter? i am thinking about putting the smaller turbo first and then the bigger one on the exhaust side and the big one first and the small one second on the intake side. does that sound right or not. or will it not work since the small turbo is not wastegated and the big one is.? i dunno

 

That's the way twins are plumbed. The small turbo should be wastegated into the large turbo for minimum backpressure.

If you got it to work it would be too much boost. The compression ratio on the IDI motors is so high that you're really living on borrowed time with the 15 psi the HX-35 is making.

 

i know, its got 21.5-1 compression pistons, i figure if i blow a gasket or something, i can make it a spacer plate motor like CAT used to do on the 342 motors to lower the compression ratio! i don't know what i'd use for pushrods, or what i'd do about the intake manifold, but i'll figure something out. either that or put some powerstroke pistons in the motor, i got another truck to drive. i'm just playing around, i want to build a diesel jetboat with a 4-speed auxilary out of a mack run backwards for an overdrive unit to the impellor. i don't know if i want a cummins or an old ford i.d.i. to do the job. but if i do it, it will be done right, that's why i am playing with turbo's now to see which one fits and makes power at different rpm's, and then decide from there what i want to do.
i drove my truck just cruising down the highway and it makes 3 si boost cruising at 70. even when i let off the pedal and coast, it still makes 3 psi at 25-2700 rpm's i don't know what that means. i am trying to find a hy-35 to put on it now tho.

 

have you removed the silencer ring? an HY35 would probably make the surging problem worse...

Forrest

 

wellthe surging is hardly noticeable. and its only under like 1200 rpms to its fine. and yes i took the silencer ring out. but my dodge is just about back together so i will probably be putting it back on the dodge pretty soon. start driving a real man's truck. and thanks for all the help. i will safe the pipes so if someday i find a hy i will try that