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01 2500 auto with a hx40....150 over injectors....adrenaline on level 3....3 piece bd manifold....running 80 on the interstate I’m getting 1000 with a little wind but not even towing anything...seems a little high?

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Extremely high.

 

I barely float 700°F with the Quadzilla on Level 7 (full wire tap). I'm running 82 MPH at 2,500 RPM and still after nearly 100 miles of this netted 19.58 MPG. Engine load just barely below 25% which is my cruise limit and floating 26.89° of timing at 2,500 RPM cruise timing.

 

 What is your engine load like at 80 MPH?

 

What size tires are you running?

 

What gear ratio is in the rear axle?

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Datalog the issue please.

 

V2 tuning or older tuning?

 

Have you done a boost leak test?

 

 

Whos injectors?

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My max engine load was 91%....not sure at 80mph but my max speed was 86mph...not sure on my tires, know my rims are 20x9....3.55 rear....I just hooked up my egt for the quad couse my autometer quake quit and this was the cheapest option....the probe is in the bottom of the manifold...don’t know if that matters or not...

 

Older tunning...have the 11 settings and did the custom tune download so I can do v2 but I’m just running on level 3...I bought the truck wrecked from a shop so I never talked to the previous owner...just know that they were 150 over injectors and it had compounds at one time....has a fass lift pump and a 4” exhuast....that’s about all I know...I’m getting 30psi on the turbo and this thing runs great just to high egts for me...

 

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Posted (edited)
10 hours ago, Tymatthew said:

My max engine load was 91%....not sure at 80mph but my max speed was 86mph...not sure on my tires, know my rims are 20x9....3.55 rear....

You should be able to monitor engine load as your traveling. Max number doesn't mean much. I need to know your tire size most likely your final ratio is too low and the engine is struggling excessively. Final ratio to the pavement should be in the 3.55 to 3.73 optimally.

Edited by Mopar1973Man

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Posted (edited)

Ok bruh.....275 70r 18....forgot I traded rims...4”lift....with a head wind of 15 my egt’s were 1050 to 1150 @78mph....engine load was 28% to 35%.....when I first started this a couple months ago my egt’s were around 700 to 800.....the only thing that’s changed is I messed with the wastegate cause I was only getting 23lbs on a hx40 with a 4”exhaust....so now I’m getting 30lbs after adjusting...either I got a boost leak which is what I’m thinking or maybe I should set the wastegate back....I go a super b special in the garage I’m gonna put on this weekend when my 5”to 4” vband gets here and see what happens...

iQuad-2019-05-24-03.22.18.csv

My data log bruh....hey thanks for the help too, not only with this but all that quadzilla download stuff as well...

 

Edited by JAG1

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1 minute ago, Tymatthew said:

Ok bruh.....275 70r 18....forgot I traded rims...4”lift....with a head wind of 15 my egt’s were 1050 to 1150 @78mph...

 

Excessive wind drag and excessive low final ratio which I calculate 3.39:1 to the ground. You need to change your gears to 4.10 at least to fix this problem. Wind drag will ever go away with the lift. 

 

Bigger exhaust isn't going to fix the problem. 4" is plenty big enough which it will take care of 600 HP easy. 

 

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4:10 will kill my mileage...I’m not going bigger exhuast I just need an v band adapter for the super b....it’s a 5” and my exhuast is a 4”....I’m gonna drop it back to stock height this summer, hate the lift but it came that way....I’ll do some tinkering and thinking...thank you

 

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The 4:10's will help with the big tires. The engine is working harder to turn those vs the oe size. But it is an expensive swap.

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Posted (edited)
1 hour ago, Tymatthew said:

4:10 will kill my mileage..

 

No, It will gain you MPG for sure. Like me, I'm twisting 2,500 RPM at 82 MPH but still kicking out 19.58 MPG

Capture+_2019-05-24-17-57-15.png

 

My last 3 years of fuel logs. You can see my Economy tune is also a big gain. 3.69:1 final ratio to the pavement.

Capture+_2019-05-24-17-58-24.png

Edited by Mopar1973Man

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If you were getting 700-800 EGTs and 20 psi boost before messing with the wastegate and now your EGTs are 1100 with 30 psi boost without changing anything else then boost leak sounds like a good place to start.

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Seriously doubt the boost is the problem most people are looking for more boost to keeping the EGT's down. 

 

The only measurement he doesn't have is the engine load before and after. Engine load equals EGT's.

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4 hours ago, Mopar1973Man said:

Seriously doubt the boost is the problem most people are looking for more boost to keeping the EGT's down. 

 

The only measurement he doesn't have is the engine load before and after. Engine load equals EGT's.

I just don't understand how the EGTs went so high by just increasing the boost.  He stated the only thing he did was modify the wastegate to get higher boost.  The lift is the same, the big tires are the same, the injectors are the same, the tune is the same, just more boost.  Unless there was something else changed between the low EGTs and higher EGTs (different tune or something). :shrug:

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High boost typically mean lower EGTs. The only way EGTs rise is engine load rises, timing is retarded, or drag is increased.

 

Boost should be left set at 30 to 35 PSI.

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Damn u guys got sum good info....I appreciate this a lot....thanks for all the posts, that’s why I pay for this site....I’ve tracked down sum 4:10 gears for a good price but I’m gonna do boost leak test when I swap turbos on my days off first....

 

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Posted (edited)

Like I'm running a HX35/40 Hybrid. Its a 60/60/12 in measurements. I hit 45 to 47 PSI of boost on WOT. Regardless, the actual EGT's while cruising 65 MPH is like 550°F and barely 2 PSI of boost. The main factor in MPG numbers is working your timing higher, then watching the engine load sink. 

 

The biggest problem you won't lose is the frontal area with the lift kit and the standing height, the only way to reduce that drag is to drive much slower. All speeds above 55 MPH are exponential for wind drag. Roughly speaking for every 10 MPH above the wind drag doubles exponentially. Hint I know my 55 MPH speeds will net me close to 24 to 26 MPG. Too tough to do with my time schedules.

 

Edited by Mopar1973Man

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OP, look for a boost leak, check your air intake, intercooler cleanliness, etc. Since it’s a recent development it’s likely an airflow issue. 

 

 

 

@Mopar1973Man not everything is a gearing problem, thou it’s your go to fix.  He stated it’s a recent change in EGT’s, and his load doesn’t indicate it’s a gearing problem... but I do find it funny it’s your go to for anyone running taller tires on a 3.55’s, even what came stock at times. 

 

 275/70R18’s are the OE 4th gen size, and they come  with 3.42’s and double OD’s. The VGT does help low rpm performance, but a 5.9 can handle that combo at 80 and not be lugging, since it’s 2000 rpms with 3.55s and a 47RE

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9 hours ago, AH64ID said:

275/70R18’s are the OE 4th gen size, and they come  with 3.42’s and double OD’s.

 

Might be true but not the same engine, not the same HP/TQ or not the same gears so it doesn't work on a 2nd Gen at all.

 

Apples to oranges don't work.

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10 minutes ago, Mopar1973Man said:

 

Might be true but not the same engine, not the same HP/TQ or not the same gears so it doesn't work on a 2nd Gen at all.

 

Apples to oranges don't work.

 

Not apples to oranges, more Gala’s to Granny Smith’s. 

 

Turbo’s work on exhaust flow, and plenty of exhaust flow at 2000 rpms for the OP’s turbo. Lower final Gearing won’t increase airflow at 2000 rpms. 

 

Trying to compare a recent change in EGT’s to a constant gearing is apples to oranges thou. 

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Posted (edited)

Not the turbo... :rolleyes: The engine load and fuel usage that creates the EGT's heat because of excessive drag.

 

More drag from the wheels and gearing means more fuel used to make it move. More fuel means more EGT's. Reduce the drag and EGT's fall pretty simple.

 

As the OP posted...

On 5/24/2019 at 3:50 PM, Tymatthew said:

engine load was 28% to 35%.....

 

I'm down lower at 23% to 25% and 82 MPH which I've reduced the drag. Both 2nd Gen, but tires are much taller on OP tire vs. mine where the gearing now 3.39 to the ground for him vs 3.69 to the ground for me. EGT are a mostly drag in his case then the engine load is high side for holding cruise timing which will make it hotter, this makes the timing retarded and EGT's higher. He's running the same turbo technically as I am and the same injectors. This leaves all that out. What is different? Is final gearing and tire size.

 

Now I'm comparing Apples to Apples. 

 

Him: 2nd Gen

Me: 2nd Gen

 

Him: 150 HP injectors

Me: 150 HP injectors

 

Him: Hx40 turbo

Me: Hybrid HX35/40 turbo

 

Him: Quadzilla

Me: Quadzilla

 

Him: 275 70 R18 3.39:1 final ratio

Me: 245/75 R16 3.69:1 final ratio

Edited by Mopar1973Man

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Posted (edited)

The gearing didn’t change to create his issue... but you can keep ignoring that and we’ll keep up with legitimate eye rolling.

 

Ever heard the phrase, can’t see the forest for the trees???

 

Lets keep making issues where there aren’t any... thou I’m starting to realize that’s the unspoken motto of @Mopar1973Man. Everything doesn't have to be a huge problem....

Edited by AH64ID
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6 minutes ago, AH64ID said:

Lets keep making issues where there aren’t any... thou I’m starting to realize that’s the unspoken motto of this website.

 

Really? 

 

6 minutes ago, AH64ID said:

The gearing didn’t change to create his issue...

 

So, what's your theory in this? 

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Posted (edited)
8 minutes ago, Mopar1973Man said:

 

 

So, what's your theory in this? 

 

Already posted.... 

 

You're too busy telling the OP to regear you’re missing the rest of the thread. These EGT issues are new...

 

 

 

Ever since you swapped to 245’s it’s amazing how many people have gearing issues. It’s like you feel the need to justify those tiny tires to yourself. 

 

Sure some people have gearing issues, but not as many as you want us to think.  

Edited by AH64ID
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Posted (edited)

No. Wrong.  I realize how the tire does affect load and final ratio.

 

You have to remember I work and lots and lots of truck driven all kind of truck with lifts and 35" and 37". Yes, it has an impact on EGTs. Now I understand people that do a lift are not going to give up heir larger tires or the lift kit this going to stay. Pure and simple. Now knowing that you create the inefficiency by bringing the final ratio back closer to what the engine was designed for which optimal 3.55 to 3.73 is a good range. 3.39 is too low of a ratio this adds to engine load. 

 

This is NOT a 4th gen truck, this is NOT a 4th gen transmission, this is NOT a 4th gen axle. 

 

I'm NOT asking the OP to swap to 245's. I'm asking him to change the axle gear to correct the final ratio to reduce engine load and EGT's. He can keep the tire just correct the final ratio. Very common issue on the 2nd Gen and larger tires. I've got one in McCall I just done a few years ago guy loves his truck now and EGT's are lower and MPG is higher.

 

37" inch tires with swapped 3.55 to 4.10 gears. Michael West in McCall.

Image may contain: sky, cloud, snow, outdoor and nature

 

So since tires are going to remain. Gears a typically the solution. But like I said to test this theory only takes swapping tires for a simple test drive. The problem goes away then the tires was the cause was the problem.  Not hard at all.

Edited by Mopar1973Man
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