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Feb 20, 2004 | 08:20 AM

Thumper4995

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Senior User

Joined: Feb 2003

Posts: 333

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From: Idaho

Boost ?

I have read several posts about boost pressure and I am still confused a bit. I have the diablo predator with gauges on my PSD. I don't have any other mods. I am planning on a new intake and larger diameter exhaust. Anyway, with the 60 and 80 HP programs, I am getting about 20 on the boost gauge when I punch it from a slow roll. Is this normal or should I expect more?

Feb 20, 2004 | 08:26 AM

HeatStroked

Fleet Mechanic

Joined: Aug 2003

Posts: 1,771

Likes: 95

From: Phoenix, AZ

Mine will boost to 25 lbs. plus in the 80 hp mode.

I installed a pressure relief valve so I don't get the SES light in the dash.

Feb 21, 2004 | 06:18 AM

DZL JIM

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Joined: Sep 2003

Posts: 2,630

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From: North East Ohio

Stock about 17 psi.
Open element filter and bigger exhaust about 18 to 20 psi.
Chip in the upper 20's.
Injectors in the upper 30's.
Upgraded turbo in the 40's.
Twin turbos upwards of 60.

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Feb 26, 2004 | 08:37 PM

bigdieseldav

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Joined: Nov 2003

Posts: 331

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From: Abilene TX

I can get over 30 on the 85 and 100 hp settings, and i get the dad gummed light everytime. I ran the diode and don't get the overboost condition anymore but rather an excessive backpressure code. I don't know how to fix that yet??

Feb 26, 2004 | 09:05 PM

cookie88

FTE Leadership Emeritus

Joined: May 2001

Posts: 13,653

Likes: 6

From: Cabot, Arkansas

Quote:

I ran the diode and don't get the overboost condition anymore but rather an excessive backpressure code. I don't know how to fix that yet??

There's currently only one way I know of to permantely fix the exhaust backpressure light. SP Diesel. In the left hand menu click on "exhaust backpressure..."

Feb 27, 2004 | 04:52 AM

Quadzilla

Postmaster

Joined: Feb 2002

Posts: 2,773

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From: Bonney Lake, WA

For the record, the same valve that SP Diesel sells comes standard with the Powershot2000 propane system. Think of it as an incentive for considering propane.

Feb 27, 2004 | 11:22 AM

cookie88

FTE Leadership Emeritus

Joined: May 2001

Posts: 13,653

Likes: 6

From: Cabot, Arkansas

Valve?? This is just a little switch that bypasses the exhaust backpressure switch.

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Feb 27, 2004 | 11:49 AM

f350xlt460

Elder User

Joined: Feb 2003

Posts: 673

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From: Virginia

on my truck before i made my intake, i would only get maybe 20 psi boost on the 60 hp program. When i make my intake, it bumped it up to about 22psi. I think it did that partly because of the intake letting in more air, but primarly because the stock intake was so restrictive (not the filter). I noticed that the intake snout was prety much up against some rubber under the hood, more then likely restricting the intake.