Boost & EGT readings for 2001

[Ghostroller]

I have a 2001 quad cab 4X4 w/ 3. 55's and an automatic, I just installed my Geno's combo gauge today and have a few questions. First I was surprised to see that the max boost reading i got was 18 psi; my 98. 5 (identical truck but 5 speed) will peg 21 psi. Is that normal? Also I installed my EGT probe in the manifold instead of the elbow like I did on my 98. 5, will this make the gauge move up and down more rapidly almost with the movement of the accelerator? My 98. 5 (probe in elbow) is slow to move up and slow to come down after you take your foot off the pedal.

 

[Mad Max]

Your gauge response can vary with the type of guage and location of sensor. Mechanical versus electic with respect to boost, as well as boost sensor placement and thermocouple placement.

I run a SPA DG111 pre-turbo and in the head by the map. Pyrometer is VERY responsive and detects my foot hopping on bumpy roads. As for peak boost, will depend on how you try to obtain it. Unloaded, on a steep overpass ramp in 6th, pegged, my lil ETH made 21 PSI stock. With the resonator and muffler gone and replaced by walker 21468 in supposedly hit 22psi in peak, but I never saw the number flash.

Throw in a boost elbow and fueling box and hello 30+psi and marginally lower EGT.

Max

 

[Ghostroller]

So it is normal to have a very responsive EGT with a pre turbo probe. Now is 18 psi of boost (fitting located in the intake runner) about par for the automatic 24V?

 

[Bigsaint]

My egt. gauge (pre-turbo) is also very responsive. The gauge is made by DiPricol. My boost reading, taken at the 3/4" plug/test port on the block, never went above 20. 5 stock and at WOT.

Scott W.

 

[CCahill]

Let us not forget, the 00/01 trucks came with the smaller turbo... My under standing is, it spools up a little quicker, but less boost... But also higher EGT's when you do the mod thing, injectors, the box, etc.

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2001 Quad,4x4,4. 10LS,LB,Loaded,no leather... . 65 Chevelle sedan, Hella nice driver, 53 Nash Rambler Convt,1 of 653 built,[not a Metro], GM drivetrain, injection, and auto/d
Specialized FSR Stumpjumper PRo
Cannondale F2000, Loaded
MTD Lawn tractor with flames

 

[Posm]

I have the boost in the intake horn and normally get about 18 LBs max unloaded and can get about 19. 5 lbs loaded WOT. The waste gate is the limiting factor no the turbo size. I elected to go in the intake horn so I could use the boost to trouble shoot any inter-cooler leaks or loose hoses. I would guess, but do not know for sure, that the boost would be a couple of LBS higher before it traveled through the cooler passages. As for the pyro, I have mine post turbo and it is not very fast to react. If I were on the edge bombing, I would place it pre-turbo, but, I think the post placement is best to reflect the amount of heat the turbo is retaining and the proper cool-down temps.

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Y2K 2500, QC, 4X4, 3. 54LS, ST, 5 speed, SWB,Cummins E-brake,Westech Pyro and Boost Dual guage, 12 Disk JVC CD

[This message has been edited by Posm (edited 02-12-2001). ]

 

[Ghostroller]

Excellent point Posm - it is important to remember pre turbo EGT probes do not provide a good reading for a low turbo temperature for shutdown. My Cummins Mid South rep says that the best preventative maintenance for your turbo is proper warm ups and cool downs. That is something all of us probably need a constant reminder on.

 

[Partyat33]

Without the boost elbow she will hit a quick peak of about 23 before the waste gate catches up. With the boost elbow she will hit 30 psi in a blink of an eye.

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2001. 5 3500 4X4 Quad Cab, ETH, Dark Garnet Red. Back Country SS Nerf Bars, Kanduco Grill Inserts (sweet tooth), SPA Boost and EGT Gauges, Step II injectors, Power Edge EZ, Custom graphics package, LineX bed liner.