Airbox Replacement?

[THoltz]

I run high EGT's with my fiver in tow uphill unless I slow down to an intolerable speed. I still have the stock airbox, but use a washable AFE Proguard 7 oilable intake filter. I read that the stock airbox is good to 500 HP and I don't think I am anywhere near that. Any ideas/opinions on what I need for an airbox & filter?

 

[MChrist]

I would first try a different air filter, even a fresh, stock one. Next, I would see how much boost I was running, since you may have a boost leak. Your intercooler may be plugged, internally OR externally. It just seems that you are either getting too much fuel, or not enough air for the fuel you have.
I have a stock '98. 5, stock other than a Banks exhaust and a K&N air filter. I can pull GCWR of 25,000 up hill on a hot day and never run over 1150. Even then, I only get that high when my rpm drops. At 2500 rpm, my EGT runs 1000-1100.
You said your EGT was high. How high is high?

 

[Ram4Sam]

If you are still running the stock muffler/exhaust system, that could be part of the issue. A freeflow 4" system would help.



Sam

 

[Bob4x4]

Without knowing your truck set-up,gearing and weight etc. it could be normal-more info is the only way you can get some good advise

 

[MChrist]

If you are still running the stock muffler/exhaust system, that could be part of the issue. A freeflow 4" system would help.



Sam

Hmmmmm... . I really doubt that that is the issue. I think that is more marketing hype than anything. Sure, it may drop EGT a few degrees, but not enough to correct the OP's problem. As an example, I still run my truck's power through the original catalytic converter, and I'm probably pushing over 500 hp at the wheels with no EGT issues.



Try the free stuff first, clean your intercooler exterior and radiator first. You may find a lot of muck in there restricting airflow through it so it isn't cooling your incoming air. Next, swap in a new, stock air filter and try that out. Also, swap your fuel filter. I would recommend doing each step and testing afterward, so you can pinpoint if/when your EGT drops. If all that checks out OK, perform a pressure test on your intercooler. That involves disconnecting your boost boots before and after the intercooler, sealing them off with something ( I used pvc pipe fittings on my big work trucks), and pressurizing them to about 30 psi and checking for leakdown. Beyond that, I'm not sure, but there is no way that a proper running Cummins should generate dangerous EGT stock. They are made to run full power all day.

Also, when you have your boots off, check to see if they are oily inside. You may have a case of oily residue feeding into the intercooler, again not allowing the outside air to cool your air charge.

 

[Bob4x4]

Towing at the wrong rpm is all it takes,the sig says he has an edge comp. With an oem turbo it is easy to overfuel with a load. The majority of boost leaks are not the CAC but a loose clamp or split hose on the fender lip.

An occaisional intake gasket leak is also more likely than a Cac

 

[Bob4x4]

Hmmmmm... . I really doubt that that is the issue. I think that is more marketing hype than anything. Sure, it may drop EGT a few degrees, but not enough to correct the OP's problem. As an example, I still run my truck's power through the original catalytic converter, and I'm probably pushing over 500 hp at the wheels with no EGT issues.



Try the free stuff first, clean your intercooler exterior and radiator first. You may find a lot of muck in there restricting airflow through it so it isn't cooling your incoming air. Next, swap in a new, stock air filter and try that out. Also, swap your fuel filter. I would recommend doing each step and testing afterward, so you can pinpoint if/when your EGT drops. If all that checks out OK, perform a pressure test on your intercooler. That involves disconnecting your boost boots before and after the intercooler, sealing them off with something ( I used pvc pipe fittings on my big work trucks), and pressurizing them to about 30 psi and checking for leakdown. Beyond that, I'm not sure, but there is no way that a proper running Cummins should generate dangerous EGT stock. They are made to run full power all day.

Also, when you have your boots off, check to see if they are oily inside. You may have a case of oily residue feeding into the intercooler, again not allowing the outside air to cool your air charge.

The 06 comes stock with a 4" exhaust the 2nd gens do not.

The 4" exhaust will decrease the 2nd gen egt's

 

[HBarlow]

I run high EGT's with my fiver in tow uphill unless I slow down to an intolerable speed. I still have the stock airbox, but use a washable AFE Proguard 7 oilable intake filter. I read that the stock airbox is good to 500 HP and I don't think I am anywhere near that. Any ideas/opinions on what I need for an airbox & filter?

What EGT do you consider high?

 

[MChrist]

I didn't catch that he had an Edge Comp. If that is off or turned down, do you still see high EGT? Again, how high is high to you? If it's off, and everything is in working order, you should still be able to pull your 5er at full throttle without problems.

Unless you are saying Cummins doesn't know how to build an engine... . uh-oh!

 

[Bob4x4]

From an earlier post by Tholz



"I get 22 psi max boost as measure by my Autometer boost gauge, my edge does tap the pump wire. I think if you are getting 25, your stock turbo is max'd out. "



If that still holds true you need to remedy that situation.

 

[MChrist]

From an earlier post by Tholz



"I get 22 psi max boost as measure by my Autometer boost gauge, my edge does tap the pump wire. I think if you are getting 25, your stock turbo is max'd out. "



If that still holds true you need to remedy that situation.

Bob, if I am interpreting your quote correctly, I assume you are saying that his 22psi is low? I'm not familiar with OP's 2002, but I thought my 98. 5 was right around 22 also. My '06 was 28 when stock.

 

[Bob4x4]

Bob, if I am interpreting your quote correctly, I assume you are saying that his 22psi is low? I'm not familiar with OP's 2002, but I thought my 98. 5 was right around 22 also. My '06 was 28 when stock.

With the comp box he should be hitting 30psi+

 

[MChrist]

How about stock psi?

 

[Bob4x4]

20 psi avg.

 

[Ram4Sam]

The 06 comes stock with a 4" exhaust the 2nd gens do not.

The 4" exhaust will decrease the 2nd gen egt's

What Bob said^^^^^.....



Hey Bob, how's things? Still fixing them in Fullerton or you retired yet/



Sam

 

[Bob4x4]

Still workin in the OC

 

[AH64ID]

Its been talked about, but really need to know your current boost and EGT's, also do you have an adj boost elbow?

 

[THoltz]

Without knowing your truck set-up,gearing and weight etc. it could be normal-more info is the only way you can get some good advise

Bob, here is some more info.



Rear diff 4. 10. Total weight 20,500 lbs. My EGT's towing up a 7% grade would excedd 1350 if I didn't back down. I do turn off the overdrive uphill and even at 50 mph I still run hot.



I was under the impression my turbo is a good towing turbo, I installed a Phat Shaft 62/65 with a/r =. 80 (14 cm housing). My boost seems to be lower than the stock HY35 which produced 20 psi with just the Edge.



I have seen momentary 35 psi boost with the Phat Shaft but not while towing. Boost at 65 mph on fairly flat I-10 is 3-4 psi and EGT is 800 and it was 7-8 psi and EGT 700 with the stock HY35.



I obviously am not properly matched up. Truck tows good unless I head to the mountains with 6-7 % grade.



Thanks,



Tom

 

[THoltz]

What EGT do you consider high?

Harvey,



I try to stay below 1200 by proper position of my right foot. I consider 1350 high.

 

[AH64ID]

Bob, here is some more info.

Rear diff 4. 10. Total weight 20,500 lbs. My EGT's towing up a 7% grade would excedd 1350 if I didn't back down. I do turn off the overdrive uphill and even at 50 mph I still run hot.

I was under the impression my turbo is a good towing turbo, I installed a Phat Shaft 62/65 with a/r =. 80 (14 cm housing). My boost seems to be lower than the stock HY35 which produced 20 psi with just the Edge.

I have seen momentary 35 psi boost with the Phat Shaft but not while towing. Boost at 65 mph on fairly flat I-10 is 3-4 psi and EGT is 800 and it was 7-8 psi and EGT 700 with the stock HY35.

I obviously am not properly matched up. Truck tows good unless I head to the mountains with 6-7 % grade.

Thanks,

Tom

The 14 cm housing may be hurting you a little, what kind of boost are you making on the 6-7% grade when your EGT's are 1350°?

Under light load the lower boost and higher EGT is normal, but you should be able to pull lower EGT's and more boost on the hills with that turbo if your fueling is the same as before.