Low Boost

[SandDemon]

I had an intriguing boost problem this weekend. I usually get 21 lbs with no problems. While towing this weekend, I'd get 21 lbs getting on the freeway in 4 and 5th. I would also be able to pull 21 lbs in 5th passing, but when I was cruising in 6th (1700-1900rpm) and would roll on the throttle the boost would stop at 16 lbs. I haven't read about anything like this yet and was wondering if anyone had any ideas.

Jeff


------------------
2001. 5 ETH/DEE 2500 4x4 3. 54 lsd, Autometer Boost & EGT. 33' Weekend Warrior 5er and an army of toys to fill it!
'96 1500 360 3. 90 LSD 3" cat back no muffler! 110,000 and still eating chebbys for lunch!

 

[DavidTD]

Jeff,

My guess is it was the RPM that kept you from maxing out. It does take rpm to generate boost, hence turbo lag. At 1700 - 1900 I would expect you are not generating enough exhaust pressure to spin the turbo to max boost. Mine does the same thing.

If I'm wrong, I'll be corrected. #ad


------------------
David
1998 3500 QC 4x4 5 speed 4:10, 235-85-16, VA CPC via JRE, PS Boost Module, RV 275 injectors, K&N air filter.
And ONE BIG A$$ GRIN.
Emerald Green w/tan leather. B&W turnover ball.
Pre- injectors - 1/4 mile 18. 2 @ 74. 75mph
Post-injectors 17. 5 @ 80 mph
1999 Exiss 3 horse slant, 4ft midtack, 6ft shortwall dressing.

 

[Alan Reagan]

I agree with David TD. You will probably need to spin it up a little more to generate 21 pounds. Speaking of generating boost, I heard you did pretty good at the drags this weekend, David.

------------------
2001 HO 6 spd 2500, 4. 10 LSD, Towing Package, Electric Brakes, SPA EGT/Boost Gauges, Fog Lights, Real Backup Lights, Molded Running Boards, Lucerix X Mount Heated/Power Mirrors

 

[ARARAR]

You're lugging it a that rpm, you need to drop a gear.

 

[Shelby Griggs]

Originally posted by arar:
You're lugging it a that rpm, you need to drop a gear.

Well, I run mine at that RPM range all day long at highway speeds here in the 55 MPH state, and that is pushing it toward 10 MPH over posted speeds. I agree that there is times that you will be lugging the motor at those RPM's with a load on, but I don't think you can make the statement that it is alway lugging in that RPM range. If so, I better put a lock out on 6th, I don't think I will be needing it!!!!

Shelby



------------------
2001. 5 2500 QC LB 4WD, ETH (Built 09-10-00), DEE, 3. 54 gears, Laramie SLT, Camper Special, Trailer Tow, Travel Convenience Group, Power Driver Seat, Alarm System, Remote Keyless Entry, Fog Lamps, Cab Clearance Lamps, HD Transfer Case, Bright White with a Gray Interior. Built 09-15-00, took delivery on 10-06-00, 12310 miles as of 05-01-01. Custom aluminum work body / flat bed. Coming soon: E-Brake and gauges.

 

[RobbyRam]

My boost psi dropped from a max of 26# to a max of 10#, and now max's at 9 #. Do I perhaps have a leak in the intercooler
(the only place that I haven't been able to check), or is the gauge bad? Why would the gauge go bad? BTY, there's no change in performance. ??? My Max EGT's,post-turbo, at W. O. T. , towing my 6k trailer uphill : only 800 degrees.

------------------
Y2K Awesome Black LB 3500 QC SLT, 24Valve ETC ISB, 4x4, 4:10 LSD, DTT Custom prepared Auto transmission VB, Power Edge 'EZ', DD2's, K&N, Polished Stull Billet Grill/Fog inserts, Chrome Smitty-Built Step Rails, Mopar Chrome-Tipped Mud Flaps, A-Pillar mounted West-Tach Turbo/Pyro/Trans Temp gauges, Rancho 9000's, Diamond Plated Tool Box, + a bunch of other stuff. Fact:The First Fords' had 'DODGE' Engines! The new PSD's need them!

 

[WestTN]

You're not lugging the engine at the torque peak. Lugging is full power applied for long duration below the torque peak.

------------------
Dennis McCormick

2001 Sport SLT+ 2500HD QC Long Bed 2WD, ETH/DEE, 3. 54LSD, White with Camel interior, Camper Special Group, Rear Sliding Window, custom ordered with ALL the goodies and priced at invoice! Stock for now. 370 miles

1989 D350 SRW Std Cab 2WD 5 speed, 3. 54 open differential, custom exhaust (mine), pump tweaks (me again), Banks aftercooler, 23 psi boost. 220,128 miles and counting. Faster than it’s new cousin!