So who has bumped the power on a 6CTA cummins

[FASTNOVA]

I'd like to see someone come up with a set up for a air to water intercooler. Maybe a certain vendor on here can come up with a kit and some before and after HP numbers.

 

[lakeydna]

Finally acquired a turbocharger for the truck Small guy is a HX-35, very similar in size to the A2 'charger.

 

[HETvet]

Turbo candy!!!!!! Please don't tease me, what are the specs of that charger?!

 

[lakeydna]

Haven't taken it apart yet. It's basically schwitzer's version of a NTC350/NTC400 turbo.

 

[lakeydna]

They left a nice open space for a second one . With the compressor clocked down it's lower than the overflow.

 

[Carlo]

View attachment 469357View attachment 469356View attachment 469355View attachment 469353View attachment 469358They left a nice open space for a second one . With the compressor clocked down it's lower than the overflow.

I guess this will fall under the WOW factor!

 

[Suprman]

I dont think you will be able to flow enough air thru the stock airbox/filter setup. Maybe an 800 style airbox on the fender with one on each side coming together

 

[HETvet]

I also wonder about filter flow and turbine A/R of the turbos. Getting them to spool would be an issue I see when in use as a traditional compound set up.

 

[Carlo]

I did some reading on this non stock double turbo and it seems the EGT goes crazy doing this and I saw photos if melted pistons, bent contecting rods, holes blow out in the side of the block, plus more. Wouldn't a pump modification or injectors be safer?

 

[lakeydna]

I dont think you will be able to flow enough air thru the stock airbox/filter setup. Maybe an 800 style airbox on the fender with one on each side coming together

I'm not certain what the CFM rating is on the filter. I haven't heard of or seen any problems when a turbo is installed on the 250 cummins. I'm not trying to make an obscene power house, just lower EGT's, quicker spool, more low end torque and better effiiciency. Running a dual set-up may help, but lots of OTR trucks run single air filters on much larger engines.

 

[lakeydna]

I also wonder about filter flow and turbine A/R of the turbos. Getting them to spool would be an issue I see when in use as a traditional compound set up.

HET's use a single air filter and there 500 HP, what does the HET A1 with the C18 cat use single or dual filters? I'm sure they are larger. Spooling a twin compound set-up should be the same or better than the original single. Drive pressures get closer to a 1:1 ratio.

 

[lakeydna]

I did some reading on this non stock double turbo and it seems the EGT goes crazy doing this and I saw photos if melted pistons, bent contecting rods, holes blow out in the side of the block, plus more. Wouldn't a pump modification or injectors be safer?

These photos you saw I'm sure were mostly "all out motors" - sled pulling, racing, etc. Just doing injection pump tweaks adds fuel and added fuel raises EGT's unless you have the increased air to match the fuel you've added. You can accomplish the things you've listed just by advancing the timing (raises cylinder pressure) Pump modds just aren't as wow

 

[nevrenufhp]

On an otherwise stock setup, the compounds wont gain much power. When paired correctly, the EGT drastically drops at full power. It really wont be of much benefit without more rpm and a bit more fuel. The stock turbo can hold up to the fuel being cranked up. The compounds will be more prone to popping a head gasket than anything. A set of studs will help stop that. The grenading of engine parts is super unlikely with this engine and the rpm, and power it's producing(even with compounds and marine injectors).

 

[Suprman]

A smaller turbo will spool faster. You would do better with a pair of small turbos in a twin setup. Larger turbo will make more power but take longer to spool. More compression with a larger turbo should create higher egts. Newer trucks do run single intake systems but they are newer designs intended for the higher airflow. Take off the muffler and put a straight pipe in place you should get faster spooling and more power.

 

[HETvet]

The c18 in the a1 het runs the same filter as the original het. Now, if it were me; I would run the larger one over the stock turbo. But the larger one wouldn't be gated at all. I also would do everything I could to retain as much heat and flow to the turbos as possible. I think you could lower spool time and get huge flows mid to high rpm As long as you have the fuel to keep up

 

[lakeydna]

The larger the housing on the primary the quicker spool for the secondary, which in turn gets the primary going. I'm going to try and find a smaller exhaust housing for the secondary (HX-40) or replace it with a T4 62/70. The Primary has a 32 cm housing so it's fine.

 

[cumminsbandit]

Ok! So I just picked up my m923a2 last Monday and just turned the fuel up today and I can't believe the results!!! I have to tell ya I'm a big 5.9 12 valve cummins guy and this just tops it all! There's no replacement for displacement! Unless you have an 855 cummins, then you just have a boat anchor! The 8.3 has the same potential as the 5.9 you just have to know how to unleash it! I made 2 3/4 turns on the screw and it feels like it went from 237 hp to 350-400 hp ish. I believe you can take the fuel screw out but I have no faith in auto trannies so ill just run this slush box the way it is for a wile!?

 

[dochowz]

Tomorrow afternoon I will finish up installing my boost and EGT gauges...with pics of course. THEN I will feel comfortable turning up the power. I'd be thrilled with 75-100HP jump. I don't want to break it, but it sure is a slug off the line fer sher...

 

[jesusgatos]

Are you guys really that unhappy with the power or is this a 'more is better' kinda thing? We just flat-towed an M936A2 350 miles with an M923A2 and it was fine? Had to slow down for some of the big hills, but I was honestly pretty impressed.

 

[Motiracer38]

I am definitely not happy with the power output of my M932A2. While I'm sure it can tow a house up a muddy slope, I'm struggling to make 35mph up hills around my house that have a 50mph posted speed limit. Of course I'm used to driving a chipped Duramax, but it can do 55mph of the same hills when towing and loaded down for a desert weekend. On the flats it can usually maintain the blinking "at speed" light but I dread the day I'll be towing home from Glamis thru Palm Springs where there's a 10 mile long uphill, let alone hitting the grapevine either way. Regearing would be nice too, but that's a whole nother topic where most people on here think it's the devil's talk doing 70mph. My end goal is to be at the most efficient RPM while hanging with the semi trucks doing 65mph. Southern California freeways are wide open enough going through the desert that safety really isn't an issue.