Best driving technique to prevent back pressure? - Ford Powerstroke Diesel Forum

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post #1 of 7 Old 12-17-2010, 08:47 AM Thread Starter
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Best driving technique to prevent back pressure?

Hey guys. I'm in the process of having studs (ARP) and gaskets (Onyx) installed. I got the Cobb's EGR delete kit as well. Since that kit has no waste gate, I was wondering what the best approach would be to prevent back pressure spikes. I assume rapid a decrease in throttle position while in a high boost state is the main reason for spikes in back pressure? Would rolling out of the throttle in that situation help? And while I'm on the topic of EGR deletion....is there any appreciable gains in throttle response and spool-up after installing a cooler delete kit or is that all marketing BS. Thanks for your help.

2008 350 Lariat CCSBSRW. 18" Monsters, 35" Nitto Trail Grapplers, 4" Superlift, S&B CAI, 5" Stainless Flo-Pro straight piped, ARP Studs, Onyx Head Gaskets Spartan 310



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post #2 of 7 Old 12-17-2010, 08:56 AM
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Keeping boost down is one way. Any time you are at WOT, you are going to see high back pressure. Not really much you can do to prevent it without a wastegate. Back pressure to boost ratio on these trucks is almost always 2:1 or worse. You want it to be as close 10 1:1 as possible, which is only achieved with a wastegate......or a single turbo.

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post #3 of 7 Old 12-18-2010, 10:16 PM
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Would opening the egr say 10 or 20% at wot help lower the pressure ? maybe save the head gaskets. And would it hurt performance ?

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post #4 of 7 Old 12-19-2010, 05:39 PM
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It would make EGT's go up, increase soot out the tailpipe, and not be good for the motor.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #5 of 7 Old 01-14-2011, 08:06 PM
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well by putting a wastegate to keep the boost down, that would mean less power???
and at what psi that wastegate is usually set at to be safe?

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post #6 of 7 Old 01-14-2011, 08:32 PM
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Quote:
Originally Posted by F35008 View Post
well by putting a wastegate to keep the boost down, that would mean less power???
and at what psi that wastegate is usually set at to be safe?
Actually, with a wastegate you don't lose much boost. Also, by relieving some of that back pressure, your truck is going to run more efficiently....which can mean more power.

You can still make 45-48 lbs of boost with the wastegate. The nice thing is, your back pressure is going to be in the 50-55 psi range at those boost levels if it has the correct spring in it and it is tuned right. Without a wastegate, the back pressure to boost ratio can exceed 2:1....which ain't efficient at all.

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Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #7 of 7 Old 01-15-2011, 05:45 PM
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OK, so if I put the EGR block off plate only, all the exhaust will go in the turbos creating more boost cuz there is no where else to go and by then creating more back pressure?? because at the beginning at tough that only small exhaust pipe was creating back pressure but now I'm not sure I understand clearly what cause it, is it because of the hot gas coming from the EGR?? can you light me up on that??

Tanks in advance i really appreciate all the info you guy's give me on that site!

F-350 2008 SRW
5" from DP, 6" MBRP Tip, AFE cold air
H&S mini maxx on HD 300
20x10 XD Diesel chrome wheels
35x12.5x20 Mud Grapplers
Pro Comp traction bars
Built tranny with Precision Industries converter

My truck Burnout: http://www.youtube.com/watch?v=MusN6...e_gdata_player

My Camaro Burnout: http://www.youtube.com/watch?v=4-8lV...e_gdata_player
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