Engine/Transmission (1998.5 - 2002) EGT's with e-brake

[roadranger]

I just put an E-brake on this past June.



Installing dealer called it a Pac Brake, but it says Jacobs on it.



Dealer said Jacobs bought out Pac Brake.



This brake has the wire connected to the ECM which delays e-brake application for about 2 seconds- -thought this was a Jacobs feature.





ANYWAY, I tow across the Rocky Mountains with a GCW of 18,000 running an EZ box on a HO with a BHAF and stock exhaust... ...

I see a 100 to 125 degree increase in EGT's, and pulling uphill hard can hit 1250* easily ever since the e-brake install.



Think a 4 in exhaust will help???



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[CFAR]

Just got my EGT gauge installed can't really get it above 1000 Wot, and thats at 85 and going, empty of course. Fuel press drops to about, oh well I'd have to, let say between 0-1 psi.

10-12 idle. I have the Bully Dog III's and the comp, I think it will run pretty hot, when these are installed I will try and keep you informed.



Woody

 

[George D]

I also tow in the Colorado mountains. I am running stock with a BD exhaust brake. My GCW is somewhat over the limit but I have never seen higher than 1050 (post turbo) even on a long WOT pull.

 

[Michael Hughes]

This is what a Jacob's eBrake looks like.

#ad

 

[CFAR]

I have seen many different EGT temps quoted by members and I'm wondering if perhaps some of our gauges are inaccurate, or perhaps mounting locations vary,



My EGT is centered over the rear (of the two) exhaust ports about 1" from the flange. (Pre-Turbo)



Is everyones in the same approximate location?



I have not towed my trailer yet, perhaps it will not cause a dramatic rise in EGT... .



Woody

 

[roadranger]

Yep, mine's mounted center of rear port also... .



I guess what I was wondering was, anyone out there with the Jacobs brake notice a RISE in EGT's since putting it on??



The other question would be-- would putting on a 4 in. exhaust get rid of some of the EGT heat?



I think the BHAF being mounted tucked in by the firewall is seeing a lot of heat generated by the radiator and intercooler on long uphill pulls. I'm thinking of pulling it off and going back to the outside vented airbox... .

 

[CFAR]

Sorry, mine was put on before gauges.

Can't live without it.



Even though it put me sideways on the Bridge comming to work this morning.



Woody

 

[RustyJC]

Towing data, stock with Jacobs e-brake:



Max pre-turbo EGT - 1300

Max boost - 22 PSIG



Towing data, as currently equipped (see signature), including EZ-supplied boost elbow:



Max pre-turbo EGT - 1100 degF

Max boost - 32 PSIG



This data was taken pulling our 13,500 lb 5th wheel through the Texas hill country in summer (high 90's to low 100's ambient temp - 6%-7% grades).



Rusty

 

[Steve Campbell]

A 4 inch exhaust would lower temps....

but for the cost benefit ratio (with your mods) just changing out the factory muffler to a NAPA 3 1/2" straight through muffler will probably get you 75% of the way there for 25% of the cost.

 

[Got Smoke?]

Originally posted by roadranger

I think the BHAF being mounted tucked in by the firewall is seeing a lot of heat generated by the radiator and intercooler on long uphill pulls. I'm thinking of pulling it off and going back to the outside vented airbox... .

I think you will notice an increase in EGT's if you go back to the factory box. I installed a BHAF on my truck at BMD Dyno Day Saturday and noticed an EGT difference all the way home and ever since I've installed it. Yes I plan on making some type of heat shield/mount, and yes I plan on order that Stainless/Chrome? Turbo Heat Shield. That will probably net me a little bit more EGT reduction.



Just something to think about. Oh yeah and if you still have the factory muffler like Steve suggested dump it for a higher flow muffler and that will reduce you EGT's as well.

 

[Whitmore]

Got Smoke

Do it like this it will be the best thing you ever did to lower your egt's



https://www.turbodieselregister.com/user_gallery/displayalbum.php?&albumid=474



cheers, Kevin