Overtuned?

[macsdaddy]

Ok, I am pulling my hair out here and would love some input. First here are my specs, 2001 excursion 7.3. Ts performance 6 position chip, external fuel regulator set to 20 psi, mag. Force stage 2 intake, power max ball bearing turbo mbrp 4 inch exhaust. The truck goes like a stuck pig on its own but when I tow my egts are through the roof. 50-60 mph on the highway with the chip in stock settings produces egts in the 9-10 range and forget about hills. This is on my lightest tows (small equipment like a trencher) all the way up to my 8k lb camper. I am tired of trying to chase down what it might be so I took it to an independent powerstroke shop that has all the best credentials. They have been through the truck driven it with and without a trailer and are wondering if it's overtuned and just can't stay cool because of all the mods. So where does that leave me? What are my options? Where else do i look, or tell the mech to look? I really like the truck and want to tow with it.

[7.3550Duty]

Well did you get your ts chip reburned when you put the turbo on?? That will make a difference in your egts. Cuz i kinda have the same setup and when im towing, i usually see around 900 or so pulling a hill til it kicks down then its fine.

[Raul@Stealth Automotive]

how high are your EGTs? it could be the turbo.. i know when i put a ball bearing TN turbo on my truck it raised my egt's... it just wasnt a good turbo setup...

you sure you dont have a boost leak somewhere? what boost numbers are you seeing when your egt's are that high?

[macsdaddy]

I sent the chip back to have it checked and retuned and ts told me it was fine. Boost numbers read 5-10 rarely over 10. I assumed the mech that has it now has inspected the up pipes and boost leak but I will double check. Duty, my experience is similar but my egts don't make a significant change with the shift and I am forced to throttle down. The egts are usually in the 9-10 range but I never push past 10 as not to damage the truck.Raul, what do you mean by bad turbo setup?

[dieselflash]

well i see that you say your fuel pressure regulator is set at 20 psi and your fuel pressure needs to be 45-60 psi in that area, low fuel pressure would cause low boost and high egts

[macsdaddy]

Didn't think about that, would it be set that way to better fuel economy? I bought the truck this way.

[dieselflash]

I dont see how that would help fuel milage, it's probably making fuel milage worse being set that low.

[Raul@Stealth Automotive]

so your only getting 5-10psi boost? that is way too low... with a chip you should be seeing well over 25psi easily....

and egt's do you mean 900-1k temp? if so that is not hot at all.. these trucks can run 1200 all day long without a problem...

[macsdaddy]

Sorry, I looked again, it has the diesel innovations external regulator and the boost pressure relief valve set to 20 psi

[macsdaddy]

Originally Posted by Raul@Stealth Automotive

so your only getting 5-10psi boost? that is way too low... with a chip you should be seeing well over 25psi easily....

and egt's do you mean 900-1k temp? if so that is not hot at all.. these trucks can run 1200 all day long without a problem...

The farthest I have been able to get the boost up is 15-20 but that was with it in overdrive. And yes 900-1 k I thought ( based only on what the old owner told me). Over 1 k started getting into the danger zone.