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setting up a waste gate controoler

snoracer

snoracer

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Location
Northern Minnesota
I'm contemplating building a waste gate controller. How do I go about setting it up? I don't want to create a new problem. I have boost and EGR gauges.
 
Well Tim since you are L56/S engined, you are a little more encumbered than the L65/F engined guys.

If you don't want codes you'll have to maintain the vac system, to keep the EGR side of things happy, you can fool the boost sensor via a boost fooler pot or fixed resistor on the MAP sensor, but the S engine system has to see variation in vacuum flow so that it thinks it is actuating the EGR system.

When I was S configured, I left the vac system intact & put a .050" + shim between EGR valve & intake to stop EGR flow, which kept the PCM happy to EGR monitoring functions all EGR stuff moved as PCM thought it should, but shim blanked off the EGR from fouling the air/fuel mix , then for boost I used a TM to control WG actuation with a var. resistor to lie to PCM what boost levels were.

Best fix IMO is to scrap EGR stuff, install F intake, and add reflash program that does not look for S sensors
 
TD - thanks for the quick reply. Yes I did mean EGT gauge. What is normal boost for this engine? Mine seems very irratic. Sometimes when starting out from a dead stop, she'll puff out a small cloud of black smoke, then boost will climb to around 10psi (with moderate acceleration) then drop off to 5psi till I lift. At cuising speed of 65mph it holds about 4-5 psi. Yesterday, at acceleration it spiked up to 12psi then dropped down to 2-3psi, and cruised at about 2psi. Doesn't seem to be consistant, and it sure doesn't feel like it has much power. I'll be pulling a trailer later this week to see what kind of pulling power this thing has. I had a powerstroke before this truck. This is my first 6.5TD, so I don't know what it should feel like.
 
Sounds like you are experiencing the normal "wussily" GM boost schedule, always at wrong amount at wrong time. You can't compare it to a P-Stroke, GM set these up to be economy minded light duty trucks, how much of a pull you looking at if yours is totally stock you will be disappointed if you are expecting similar to what the Strokes do.

But luckily for you you wound up at the right location to get the straight scoop on how to maximize the output of your 6.5

factory rating for the 6.5 was an anemic 185 flywheel rating, some of us are at or very close to 300 hp now, which is a pretty good leap for an IDI engine last time I dynoed in 2005 (have added some mods since) I was 197 @ rear wheel you figure 50-60 Hp lost thru the driveline

I see in your sig you were C-130 crew chief, powered by the venerable T-56 turbo props; time was I could do can changes on those with my eyes closed, we used a derivative of them on the destroyer I was on to power each of the (3) 2.5 Mw gen sets we called them Allison 501 K-17s
 
So are you saying that my irratic boost is normal? Will a TM help, if so, what exactly do I have to do to make it work without creating other problems. After reading other posts, it seems like when one thing is changed or modified, it creates some other problem, and lt leads to spending more money to fix or change something else. My problems all started shortly after I bought this truck last fall. It all started with the intermittant PMD problem. Since then, it has turned into a money pit. It's a long story, so lets just say I have spent way too much time and money on this thing and have only been able to put 3,000 miles on it since last Sept cause it's been down for repair so much.
 
Erattic boost is normal a function of the PWM control of boost, not really erattic per-sei just the way the boost on the 6.5 is controlled. Adding a TM will give positive boost control, but since you are S engined, adding a boost fooler will be least expensive for you to do now, some prefer maintaining vac sytem, I don't, as IMO that is another weak spot in the 6.5, I got left stranded almost, towing a 18K load when my WG actuator diaphragm crapped out, fortunately I had a TM with me and was able to finish the tow.
 
snoracer said:
After reading other posts, it seems like when one thing is changed or modified, it creates some other problem, and lt leads to spending more money to fix or change something else. My problems all started shortly after I bought this truck last fall. It all started with the intermittant PMD problem. Since then, it has turned into a money pit. It's a long story, so lets just say I have spent way too much time and money on this thing and have only been able to put 3,000 miles on it since last Sept cause it's been down for repair so much.
Click to expand...

Don't read too much into posts, what you don't see are the thousands of successful 6.5 miles, unfortunatly as owner of a 2nd hand 6.5 often owned by uneducated drivers, or maintained by inept dealer mechanics, a lot of bad has to be resolved/un-done for you to gain confidence in your 6.5.

I'm partial to this site as being the current premier 6.5 resource, I once beloned to the then best sites, but alas things change and IMO they no longer fit that description. We have more seasoned 6.5ers that still operate the 6.5 here so we'll soon build your confidence in your 6.5 all is not doom and gloom.
 
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