Drive pressure

[Cummins6speed]

Im kind of familiar with the concept but would like someone to teach me about drive pressure. Where does the d/p gauge go? What is ideal drive pressure? Is the drive pressure ratio d/p over boost or the other way around? blah blah blah. Thanks :thumbsup

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My truck: 06 5.9 G56 4x4 Quad Cab Short Bed Patriot Blue. Smarty TNT, Valair 3600DD, DiPricol's, Home made intake w/ amsoil filter, Straight Piped w/ 7" tip, silencer ring MIA, glove box sticker MIA 2/28/09-470hp/980tq

IBEW 551-PACIFIC COAST DIESEL

[snackpack]

all i know for sure is it asn't to exceed boost pressure. and i'd assume you put the sensor like right next to the egt probe on the manifold.

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02 silver QC, LB, 6-spd,ADRENALINE /PULSE , SMARTY, 150's, ARP studs, AIRDOG 150, Southbend DD, boost elbow, dual 4" silverline with 6" tips, S&B CAI Exhaust Brake

[Cummins6speed]

Originally Posted by snackpack

all i know for sure is it asn't to exceed boost pressure. and i'd assume you put the sensor like right next to the egt probe on the manifold.

Yeah I figured you would put it on the manifold but wouldn't the heat melt the tubing?

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My truck: 06 5.9 G56 4x4 Quad Cab Short Bed Patriot Blue. Smarty TNT, Valair 3600DD, DiPricol's, Home made intake w/ amsoil filter, Straight Piped w/ 7" tip, silencer ring MIA, glove box sticker MIA 2/28/09-470hp/980tq

IBEW 551-PACIFIC COAST DIESEL

[1000EE-Monarch]

Originally Posted by Cummins6speed

Yeah I figured you would put it on the manifold but wouldn't the heat melt the tubing?

How about using a length a thin (1/8" OD) stainess-steel line and coiling it up, then going to plastic somewhere away from the manifold, like on the firewall.

Copper would get soft from the heat and probably break.

If there was a leak somewhere, and the hot gasses started to escape, that would wreck the plastic. However the small diameter and length of the ss line should do a good job of limiting flow and temperature.

Here's another thought, which half of the manifold to tap into? As far as I know the front half does not get the benifit of a wastegate, so the DP's would be diferent in the two halves of the manifold. This may not apply to the later CR motors.

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Alex K.
'01 3500 QC 4x4 NV5600 HO. Stock for now. BHAF, no silencer ring, muffler delete.
WANTED: '98 12v 3500 QC 4x4 5spd 3.55 gears

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Last edited by 1000EE-Monarch : 09-20-2008 at 09:53 PM.

[BBRam]

The drive pressure is read from the exhaust manifold. The ideal ratio is a 1-1 reading between drive pressure and boost.

[Cummins6speed]

How do you calculate the ratio? boost/drive or drive/boost?

__________________
My truck: 06 5.9 G56 4x4 Quad Cab Short Bed Patriot Blue. Smarty TNT, Valair 3600DD, DiPricol's, Home made intake w/ amsoil filter, Straight Piped w/ 7" tip, silencer ring MIA, glove box sticker MIA 2/28/09-470hp/980tq

IBEW 551-PACIFIC COAST DIESEL

[BBRam]

You use a standard boost gauge to read drive pressure as well. If your running 50psi of boost at the intake, it is ideal to be reading 50psi of drive pressure from the exhaust manifold.

[SmokinDiesel]

Originally Posted by BBRam

You use a standard boost gauge to read drive pressure as well. If your running 50psi of boost at the intake, it is ideal to be reading 50psi of drive pressure from the exhaust manifold.

You beat me to it Brian! ... Thanks

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Michael Charlton - Keystone Diesel

[Cummins6speed]

I know, but how do you calculate the ratio? What goes on top of the fraction? The boost number or the d/p number?

__________________
My truck: 06 5.9 G56 4x4 Quad Cab Short Bed Patriot Blue. Smarty TNT, Valair 3600DD, DiPricol's, Home made intake w/ amsoil filter, Straight Piped w/ 7" tip, silencer ring MIA, glove box sticker MIA 2/28/09-470hp/980tq

IBEW 551-PACIFIC COAST DIESEL