The Big 3 on one truck/Dyno

jwalk09 · Jul 4, 2016

higherlife said:
I switched back to spar10 tunes because I didn't feel comfortable daily driving yet alone towing with those numbers. EBP being high it's good for the engine. This is what I have found:

At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load.

So what are normal back pressure numbers during slight acceleration, wot, etc ?

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jwalk09 · Jul 4, 2016

Jomax said:
To everyone asking about EBP, I've seen mine spike to 59psi.

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Running gh tunes ?

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theplumber · Jul 4, 2016

20156point7 said:
The lvl 2 v8 acts completely different than the lvl 4. I like the way lvl 2 shifts over lvl 4 also.

Yep shifting on level 2 is spot on imo.

Jomax · Jul 4, 2016

jwalk09 said:
Running gh tunes ?

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Yes sir. At WOT It's almost 1:1.

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jcain · Jul 4, 2016

1:1 at WOT should be a clear indicator that it's inaccurate

jwalk09 · Jul 4, 2016

Jomax said:
Yes sir. At WOT It's almost 1:1.

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But you see it spike a lot over boost during low throttle ? Would a ccv reroute affect it at all ?

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Jomax · Jul 4, 2016

jwalk09 said:
But you see it spike a lot over boost during low throttle ? Would a ccv reroute affect it at all ?

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It will spike at first sometimes, but only if I punch it from a 45mph roll,etc.

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jwalk09 · Jul 4, 2016

Oh I noticed mine would spike to around 40 when boost was only like 8 or so during slow acceleration from a stop

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Jomax · Jul 5, 2016

jwalk09 said:
Oh I noticed mine would spike to around 40 when boost was only like 8 or so during slow acceleration from a stop

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It all depends when the veins open/close. Can honestly happen at any throttle position.

I wouldn't worry about it

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CATDiezel · Jul 5, 2016

Lol... a 7.3L with a hot tune and stock turbo will bush 60psi EBP....

It's funny 10 years later we are worried about 40psi ebp. Back in the day it was like "Cool man I got 60psi ebp"

I wouldn't sweat 45psi ebp spike... or even a steady 40...

jwalk09 · Jul 5, 2016

CATDiezel said:
Lol... a 7.3L with a hot tune and stock turbo will bush 60psi EBP....

It's funny 10 years later we are worried about 40psi ebp. Back in the day it was like "Cool man I got 60psi ebp"

I wouldn't sweat 45psi ebp spike... or even a steady 40...

Thanks for the info. I'm new to the diesel scene

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lincolnlocker · Jul 5, 2016

CATDiezel said:
Lol... a 7.3L with a hot tune and stock turbo will bush 60psi EBP....

It's funny 10 years later we are worried about 40psi ebp. Back in the day it was like "Cool man I got 60psi ebp"

I wouldn't sweat 45psi ebp spike... or even a steady 40...

lol. i was just gonna say that my dually has pegged a 60psi bp gauge.

nice comparison fellas! i doubt any of them would be hard on rods as enough time has bean spent making the tunes what they are but if it where an issue, P!P would be the easiest on them with nearly the same horsepower.

live life full throttle

god bless america and the farmer who feeds your fat ass

higherlife · Jul 5, 2016

lincolnlocker said:
lol. i was just gonna say that my dually has pegged a 60psi bp gauge.

nice comparison fellas! i doubt any of them would be hard on rods as enough time has bean spent making the tunes what they are but if it where an issue, P!P would be the easiest on them with nearly the same horsepower.

live life full throttle

god bless america and the farmer who feeds your fat ass

So yalls 7.3 would hit 60 psi of ebp with 0 boost?

lincolnlocker · Jul 5, 2016

higherlife said:
So yalls 7.3 would hit 60 psi of ebp with 0 boost?

no but it went past 1:2 ratio a lot.. i am assuming that it's the blade hesitation on the 6.7 and quicker spool features that make it do that.

live life full throttle

god bless america and the farmer who feeds your fat ass

higherlife · Jul 5, 2016

lincolnlocker said:
no but it went past 1:2 ratio a lot.. i am assuming that it's the blade hesitation and quicker spool features that make it do that.

live life full throttle

god bless america and the farmer who feeds your fat ass

Gotcha. I know things got a little off topic but it was brought up that the tunes are spiking ebp at very low speeds while 0 boost is being created. I had sometime yesterday afternoon so I data logged it and the highest I got was 47 psi/0 boost. It only happens when I come out of a compete dead stop or a slight roll and it kept it high until around 5 psi boost then it would drop.
I think this has to do with the turbo vains being turned off. I understand ebp helps the turbo spool but it seems a bit excessive imo.

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higherlife · Jul 5, 2016

now doing a wide open run or towing something heavy, i would expect ebp to get up there but it would coincide with boost to some degree and create your 1:2 ratio or something like that.

SpartanDieselTech · Jul 5, 2016

higherlife said:
Gotcha. I know things got a little off topic but it was brought up that the tunes are spiking ebp at very low speeds while 0 boost is being created. I had sometime yesterday afternoon so I data logged it and the highest I got was 47 psi/0 boost. It only happens when I come out of a compete dead stop or a slight roll and it kept it high until around 5 psi boost then it would drop.
I think this has to do with the turbo vains being turned off. I understand ebp helps the turbo spool but it seems a bit excessive imo.

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Is this on one if these tunes that has the "idle hiss" turned off?

higherlife · Jul 5, 2016

*******DieselTech said:
Is this on one if these tunes that has the "idle hiss" turned off?

I think so. Just got the update last week.

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CATDiezel · Jul 6, 2016

*******DieselTech said:
Is this on one if these tunes that has the "idle hiss" turned off?

Interesting thought. I see where your going with this.

Put up with the hiss or have a laggy turbo off the line?

Jomax · Jul 6, 2016

CATDiezel said:
Interesting thought. I see where your going with this.

Put up with the hiss or have a laggy turbo off the line?

I'm not experiencing any of this. Nor do I have a laggy turbo. I have my cts2 alert me when I hit 50psi EBP. And I hit that at the same time as before. Nothing changed for me in that aspect.

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