EP (Drive Pressure) 80 + psi? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 02-17-2010, 02:17 PM Thread Starter
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EP (Drive Pressure) 80 + psi?

For the data loggers out there, what are you seeing for EP (Drive Pressure), I have been seeing 84psi with moderate acceleration with boost numbers around 40> 45 psi that is a 50>50 % ratio, & the EP sensor is down streem, I hate to see what it is @ the turbo! quite high! somethine is going to give i'm sure, I'm running (310 tcm)
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post #2 of 17 (permalink) Old 02-18-2010, 01:35 PM
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you might want to get a wastegate in there. You're taking a chance on lifting your heads with that much drive pressure.
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post #3 of 17 (permalink) Old 02-18-2010, 07:12 PM
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ebp

Hey, I was seeing those same drive pressure #s with the 275 v4. It does seem like a lot of extra stress just easing around town. I went back to my original 275v3 and have seen back pressure at the highest 54. This is a lot less than 84. Takes a lot less throttle to get going as also with the 275 v3.
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post #4 of 17 (permalink) Old 02-18-2010, 08:49 PM
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I have seen it spike to 70 at stock.... the 250 tune seems to stay in the 60's so i am not sure what "to high" is?

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post #5 of 17 (permalink) Old 02-18-2010, 09:51 PM
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ep--exhuast back pressure starts out at stochiometric--if thats spelled right---14.7psi and then goes up...
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post #6 of 17 (permalink) Old 02-18-2010, 09:52 PM
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sorry---ebp..
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post #7 of 17 (permalink) Old 02-18-2010, 09:55 PM
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very good point.

Lets just say not quite stock.
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post #8 of 17 (permalink) Old 02-20-2010, 12:40 PM
 
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You've got to subtract the actual atmospheric barometric presssure. So the readings depending upon where you are in the country are actually 12-15 PSI higher than actual internal pressures.
post #9 of 17 (permalink) Old 02-20-2010, 10:56 PM
 
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Even with subtracting atmospheric, that is not safe for the truck.

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post #10 of 17 (permalink) Old 02-21-2010, 02:45 AM
 
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Quote:
Originally Posted by [email protected] View Post
Even with subtracting atmospheric, that is not safe for the truck.
No dissagreement there Aaron! Wastegate FTW
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