wyattearp29

I know they run these on the cr engine. Will they work on my 1999. Will I have to have masssive amounts of fuel. I am going to put on the he351 on as a single. I have been reading about twins and it sounds like a good way to cool your truck. I live in utah and the elevation kills you. I can fab most of the pipe.

Tate

Run S475, or even a K31, and it should be a good spooling set. S480 will take more work, but give you more potential power. With a VP, I don't think you will outgrow a 475 though.

BigErksG2

daily driver in the mountains... I would do a hx35 over a k31 or 3b. Easily cool 500hp+ and tow all day. I personally love the 3b, once it starts singin you need to grab a hold of somethin and the 35 helps things get moving quick. The he351 might be a little slow on the bottom end for a DD in high elevation.

HOHN

I don't think the he351 would be slow at all for a DD in thin air.

If you have poor spoolup with a HE351 in a twins setup, it's because your primary is too restrictive.

It's ironic, but true in that a larger big turbo can help spoolup faster-- how so. you ask?

Well, it depends on what you mean by spoolup. If you mean "when the turbos start making boost" then a larger big turbo (nice open hotside) will spool way better.

But if by spoolup you mean "when the big turbo makes pressure in the crosstube" then a big charger is slower-- of course.


I favor larger, free-flowing big chargers because they are a LOT less restrictive to the small turbo. This helps keep drive pressure low and helps with EGT control. It doesn't take much boost in the crosstube to really improve the efficiency of the small turbo, and the more boost your running in that crosstube, the less efficient things get.

Larger turbos also much larger compressor maps, meaning it's more efficient almost all the time.

Personally the SMALLEST primary I'd every consider would be a B2, with an S480 being even better.

wyattearp29

Thanks for the replies. I know gwhammy is running the he351 over a 3B. I just don't know what the elevation difference is. I just want somthing that works good for towing and as a DD.I usaully tow 10000 pound 5er with a 18 ft trailer behind for my wheelers. My hx35 does alright getting it going but it run hot and laggy on the top end. I am definatley going to the he351 after seeing what big blue has done with it. I am not looking for big horses I am just looking for a truck I can tow with and not have to worry about egt's as much.

gwhammy

We live all the way up at 700 ft elevation! This set are the favorite of the three sets I've had. They tow great and spool really good. The weather has been real hot this week but with the adrenaline on 0 and 200 horse injectors I get a little smoke at takeoff and then a slight haze. I've got another set in the garage but a buddy is taking s400 off a tractor and I may get it and build a he s400 to see if its any better than the 3b.
I gross 24,000 alot and no problem with temps unless it's a real long hill but then it's just around 1300. I think you'd like them.

wyattearp29

Hey thanks for the reply. I live at about 4500ft. I wonder if I would have any problems. It sounds like a sweet setup. Do you think I would have to get bigger sticks. I only have the rv275.

Tate

Is there a typo in there?

HOHN

probably!

I think I was trying to say that you hit the point of diminishing returns pretty early. You have to triple the inlet pressure to the small charger to double the flow.

So if your small charger flows 50lb/min when it's up on boost, you'd have to feed it with ~29psi of crosstube boost to double the flow.

Far more efficient, imo, to run a 66lb/min turbo up top that only needs to increase flow by 50% to deliver the 100lb/min .

Of course, this is laggier..

Big Blue24

I bought a 95' Junker 12valve for a drag truck a few weeks ago towed 450 miles or so in the southwest heat.

2200 lb trailer plus 95' 2wd made for 8K in tow. I was running 70-75 all day long on the flats with 740-790 for EGTs and 5-8 psi boost. I pulled a few 6% grades around 3500-4000 ft and He351 did great with EGT control.

I did hit one 6% grade that lasted for 5 miles. EGT's were hovering around 1150 to 1200 at 72mph. 2 minutes into the pull, the coolant temp started climbing pretty fast so I had to slow down. I was in the middle of nowhere so I didn't want to "test" the upper end of the coolant gauge so i slowed down to about 60mph for the rest of pull, EGT's hovering upper 900's, boost around 25psi, IAT around 145*.

My coolant system has not been flushed in a long time so it could have been a small part of the problem. I was also running 8* comp tune on the Adrenaline on PL2 so no pump stretch "late fueling". I wonder if the added timing forces the motor to absorb more heat and contributed to the coolant temps.

It was about 95*F that morning during the pull so outside air temp did not help with the coolant temps. I have never ran twins, but unless the extra airflow through the motor helps to cool things down, the stock Dodge cooling system doesn't have enough capacity to tow with 400 HP sustained.

I also wonder if water injection system would have provided enough liquid intercooling to allow me to finish the long grade without coolant temp spiking.


The only other time I can remember seeing coolant temps up near upper white mark 210*?? was back when I had just an Edge Comp on level 3 and was completely stock otherwise. I was towing over Malad Summit on the Utah/Idaho border with about 7-10K in tow. A Ford 6.0 with a similar sized trailer looked over at me and nodded. We raced to the top of the summit above 5000'. I had him by two or three truck lengths as we crested and I looked down to see my coolant temp right up near the red mark 230*F. I immediately let off and coasted around 65mph down the backside as the Ford guy ripped passed me. He lost the race to the summit but still had something to prove on the downhill... idiot!


Long story short, the He351 has towed everything all that I've asked it to and still maintain highway speed. The only complaint I have the second half of the 1/4 mile track with 500hp worth of fuel where it runs a little warm.

gwhammy

I used to run jammer 4's. I really don't see any difference in smoke between the two injectors. Our heat around hear has more influence on the truck than anything. I agree you can run only so much usable power before the cooling system won't keep up. With the adrenaline on 0 setting I'm seeing up to 40 to 42 lbs. of boost. The spring on the he is set for 30lbs max out of it.
There are probably better setups out there but this one suits for my towing and regular driving. I've thought about using a he 341 over a 3b to see if it would spool quicker but time is my problem. I was thinking the maybe the 341 may have the same good wastegate for flow.

I think any size stick will work as long as you have the ability to turn up the fuel some other way.

DodgenIt

Them in those PowerJokes always do dont they.'s

Mountaineer

What were the other sets and could you give a comparison between them all as far as spool-up and overall cooling ability.

BigErksG2

big blue is running a SINGLE he351. Putting it in a twin setup changes alot. I like my setup being able to build 10-15 lbs of boost without smoke at 1500rpm so downshifting is less frequent.

wyattearp29

Hey this is all good stuff. I think I will just stay with the single he351. I am trying to keep the wife happy. I try to do about one or two mods a year. I drilled the waistgate out to 1.00". I am waiting on a downpipe from ebay. I have a tig welder so maybe I can weld up a custom downpipe. Hey should I go with a boost elbow,spring or a boost controller like big blue has?