I have run into a problem with my current setup with my egts while towing no matter what I have my my quadzilla set on. 

 

If I continue to tow a lot what turbo should I upgrade to or should I go back to stock injectors? 

 

The turbo is the original HX35. 

 

If I upgraded turbo I just want a direct bolt on. 

 

 

Thank an you for your input. 

 

test for boost leaks?  

 

What do you consider high egts? What type of boost are you seeing?  

 

more info is needed.

32psi 

 

1150 at 60% throttle and a big black cloud. My quad will defuel at 1150. 

 

Cruising at 70mph 832 unloaded at 10psi

 

 

Edited September 1, 20168 yr by 903Dodge

Test for boost leaks.   You should be spinning that turbo to mars with the fuel you have.  I would expect 40+ psi. 

De-fueling at 1150 seems sorta low doesn't it?

not really depending on the use of the truck.  The quad also ramps down slow so you might see higher than that EGT's if you have a load on it.  1150 will give you a good safe buffer.

Gotcha, just curious. I was thinking back to when I was towing the travel trailer. Up some fairly steep grades I saw probably 1000-1100, but that's stock fueling, stock exhaust, stock intake so either way I knew I'd have to really try to get myself in trouble.

I  was under the impression that anything over 35psi required head studs. That's why I have my boost elbow set at 32psi. 

Edited September 1, 20168 yr by 903Dodge

Heads studs are a good idea, but stickers hold past 40 no prob.  

 

 

Bump up boost to 35-38 and test for boost leaks

I will give that a try. Thank you. 

Just to give an update. I have been busy with work, but I have managed to get the material needed to build a boost tester. So now I just need the time to do it. 

On 8/31/2016 at 9:49 PM, Me78569 said:

Test for boost leaks.   You should be spinning that turbo to mars with the fuel you have.  I would expect 40+ psi. 

 

Even for my set up I've taped 40 PSI of boost several times now. I would say look for boost leaks as well. Create a boost cap and pressure the system and use some soap solution around gaskets like the intake horn and intake cover. Don't for get to check for around the two sensors MAP and IAT.

 

I'm running a Edge Products unadjustable elbow. It typically holds fairly true to the 35 PSI if you climb up on it slowly. If you hammer down and grabbing gears the surge is fast right to 40 PSI but usually pops the wastegate and falls again below 36-37 PSI.

Finally got around to building and doing a boost leak test. Only leak I found was at the rubber hose going to the boost elbow.

 

I also got to messing with the setting on my Quad and have fixed my EGT problem and still have plenty of power with little smoke.

That's good to hear.

I have the same issue. How did you set the quad to fix it?  Everything I've tried has failed. Thanks

Please tell us what your setup is and what tune you have on the quad along with what custom tune you are running.  

I am doing this off memory cause I don't have it around at this time.

 

This is what seems to work for me. I think I am set a level 5. 

 

Power levels: 11

Tps min: 0

Tps max: 100

Tps Can: 5

Tps max: 100

Timing: 7.5

Timing scale: 100

Fuel stretch: 1200

Boost scaling: 35 (I think)

 

Besides a light haze down low, it clears up and spoil the turbo up a lot faster (or so it seems)

 

 

I had a very similar problem after some mods which included EDM Mach 2.5 injectors (or so I thought they were 2.5's according to the person I bought them from.....he said they smoked too much for him).  In hindsight I believe these injectors were mismarked and very likely a much larger injector.   My EGT's went crazy even with NO load being pulled and I could kill mosquito's at the drop of a hat with the smoke trail I was leaving. The filter minder would get set even with a NEW OEM airfilter.  I tried an aftermarket high flow oil filled gauze air filter that continued to set the filter minder.  I finally went with the BHAF but my EGT's were still far too high under any kind of a load but much improved.  I next installed a Farm Boy 5 inch straight pipe exhaust and this dramatically lowered my EGT's.......enough to the point that the truck's drivability with a heavy load could be easily managed with a good eye on the EGT's guage, boost gauge, and down shifting to a lower gear to keep temps in line.  Eventually I may go with twins but not before I install head studs.  Bottom line is that if you put a lot more fuel and air through your engine, you need to upgrade the ability to get air in and exhaust gases out. 

1150° does seem a little low unless your never wanting to look at the pyro. 

 

My 0.02 is to set the defuel at 1350° and watch the pyro when towing. You might actually find that with additional boost and 50° more EGT you run better. 

 

You should be fine at 1250° all day long unless your running very low rpms or VERY advanced timing. 

 

 

Edited January 4, 20178 yr by AH64ID

I know mine's a 12 valve, but just for the record.  I held mine at 1300°F for a couple minutes multiple times, and it's seen 1600°F in 20-80 MPH runs in 4th.  This was with stock timing, stock head, basically stock everything.  Well I pulled the head off and everything was in picture perfect condition.

 

Like AH64ID said, keep the RPM's up and it will live.  With increased RPM, the swirl built into the head prevents the pistons from seeing to much of the heat.  Me personally, if it's burning clean, I don't worry about temps.  Smoke is un-burnt fuel, but it also indicates longer burn times.  The tune I had a while back was to me the perfect towing tune (or my clutch-saver tune).  It maxed out at 34 psi with my HX35 W/spring gate, made 300 hp, and I could hold it to the floor anywhere from 1800 to 2500 and never crest 1200°.

 

Here's the dyno run of sorts.  The hump at 1700 is a little clutch slippage.

Edited January 5, 20178 yr by Cowboy