E-Brake and EGT's

[Sixpack]

I just finished installing my Jacobs E-brake and everything seems to be working great..... except my EGT's seem to be running higher than normal. With the upgrades listed below I can hit 1000* under WOT running down the freeway. Is this normal for my truck without after market air intake and exhaust? Will adding one or both help lower the EGT's? I haven't hooked up the 5r yet but I will in the next day or two and find out what temps I will have towing. Any thoughts or suggestions are welcome. Thanks Phil

 

[Dkevdog]

I have a nearly identical truck to you (or did until I added exhaust) and I can hit 1100 if I drop a brick in it. It goes down real quick though. As a reference, I could hit temps of 850-900 with the truck stock (only had gauges at the time). I'm considering it normal, but I'm sure others will disagree.



What was normal to you before the brake? The temps with the 5er on board will be your real test .



Kev

 

[RustyJC]

Our truck had the Jacobs e-brake installed by the dealer before we took delivery, so I don't have any data without the e-brake. Towing a 13,500 lb 5ver stock with the e-brake, I've seen 1300 degF pre-turbo EGT at WOT. With the mods in my signature (including the EZ boost elbow), max pre-turbo EGT towing has dropped to 1100 degF.



Rusty

 

[KLockliear]

Yep, turbo mounted brakes hurt you EGT wise. This is why we only recommend inline brakes.

 

[CFAR]

Hurt can be a relative term, the question is what will he see with the 5er. 1000* is not a problem. Maybe a BHAF or ScottyII, Straight pipe, or 4".



With my mods, unloaded, to reach 1250* pre, I've got to nail it at 50mph and by 90mph, wot all the way. Of course hills and load change everything.

 

[Sixpack]

I guess these temps seem to be the norm! I guess I'll try the exhaust and air and see if I can drop it a bit more. Thanks for the input! Phil

 

[MrFixit]

High EGT's w/ inline

I was told my EGT problem w/ my last truck (F@*#) was due to the US Gear E brake. I never got to remove it to test because the motor grenadedd on a trip, hence why I bought the Dodge.



What bothers me on the Cummins is that totally stock, I can hit 1350+:--) on a long grade (6%) towing a 10k lb 5er. This grade is for ~10 miles (395 outside of Bishop CA). I used to charge this hill full bore, and now I back out of it becasue of what my gage is seeing. I thought these things were designed not to see those temps. I guess the altitude my play a role in it. 4-7k feet.

 

[RustyJC]

As I said earlier, I would see 1300 degF towing our 13,500 lb 5ver in stock configuration. The biggest improvement in dropping EGT's on our truck was the addition of the EZ and boost elbow - the increased boost (30 psig vs 21 psig stock) results in increased airflow that dropped the EGT's to the current 1100 degF max. In stock configuration, the BHAF didn't change my EGT's at all. The 4" exhaust helps somewhat, but not nearly as much as the boost increase.



Rusty

 

[MrFixit]

Not Stock

But Rusty,

you stated stock, but you have the Ebrake which some are stating might be restricting the flow. My 1300 was stock before my 4" exhaust. I have not yet towed with the exhaust but do expect some drop.

 

[RustyJC]

As I stated in my original post, the Jacobs e-brake was a dealer-installed accessory before I took delivery of the truck - it was part of the negotiated deal when I ordered the truck. Therefore, I have never driven it 1 inch without the e-brake. When I say "stock" EGT's were 1300 degF max, that's with the e-brake but with absolutely no other changes - gauges were my first mod. My current EGT's of 1100 degF max are with the e-brake as well, but with the other mods shown in my previous signature.



I've seen a number of forum participants with 2001 and 2002 HO's who reach 1300 degF pre-turbo maximum EGT's without e-brakes, so I really wonder just how much effect the Jacobs e-brake has. My point is that, even with the e-brake, more towing power and reasonable EGT's are achievable with a few well thought out modifications.



Rusty

 

[MrFixit]

Point taken

I understand your point now Rusty. Not trying to ruffle any feathers, we just had a difference in opinon about the word stock. Been working with Dkevdog to solve his EGT problems. I want him to take the brakeout temporarily and see if there is any difference... . probably not much. I don't think I have told him yet though.



I was tempted to run higher on the gage becasue I didn't used to have the gage and ran hard on the hills with no mods. Now that I have installed the 4" exhaust, I will have to see how high I can go. Sorry for the confusion Rusty and thanks for the for the info.



Ramon

 

[Dkevdog]

My Jacobs brake was installed after I had performed mods on the truck (EZ and 275's). I saw no increase in EGT temps after the install. I do see how the restriction of the butterfly valve could cause an increase in temps, but in my case ( I think my temps to be high BTW) it didn't make any difference.



But rolling through the hills... ... ... not using service brakes is nice... ... . unless you're behind me... ... . just ask Ramon . .



Kev

 

[Sixpack]

Well I hooked the trailer up tonight and gave it the true test. The exhaust gas temp was not a problem. Climbing a pretty good grade (5-6%? a mile long?) on I-5 the truck held 68 mph at 1100* in 6th. If I wanted to I could have gotten it hotter that is for sure. But I don't feel I have to run right out and get air and exhaust for the truck. The brake worked good too. I can't wait to try a real grade with the brake! Phil

 

[Dkevdog]

Sixpack- If you could hold nearly 70 on a grade with temps under 1200 I'd say you're doing real good. You'll love that brake once you get to the top .



Kev