Is anyone else getting an overboost code with the Smart SR installed. Have it set on Catcher 4, timing 2, rp 2 and every now and then the code pops up, my egt rises and power drops. I delete the code and its good to go. Clearly this is not the way to go about things? Any ideas?

 

How much boost are you making?

Do you have the WG off or on?

 

About 38-40, Waste gate is set to stock, so on for a factory turbo.

 

Yeah, I get it from time to time.

The smarty can only boost fool to the limits of the ECM, it's either 42 or 44 PSI. If you go over that, you throw a code.

You can either just clear it or buy a boost fooler.

You might want to be careful how much boost you run with the stock turbo... 35-ish is getting out of the efficiency range and just creating more hot air.

 

That's why. Turn the WG off and you won't throw a code until 44psi.

38-40 is a lot for the stock turbo, may want to try to keep to 35 or less like madhat suggested.

 

The WG option has nothing to do with over boost codes. The WG option has to be off or he has plugged the boost reference line to the actuator as there is no way it gets to 38-40 psi without something done to the stock system.

Something is not right to throw a code at those boost levels, maybe MAP or how the boost is being read? I have never seen an overboost code or degraded performance with or without a BF with Smarty loaded and my truck has spent a lot of time aboove the stock boost level.

I would set the truck back to stock, update your Smarty with the latest software, and reload it to see if there was a glitch with the load.

 

The WG setting does two things, the first is reset the max allowed boost to the max of the MAP sensor (think 03-04), the other is keep the WG from opening on a 04.5-07.

You throw enough fuel at at HE351 and you can build boost beyond stock levels and get a code with the WG modulating. If the CEL illuminates thats from going above stock boost levels, the ~44 psi overboost generally doesn't throw a CEL.

When the WG is on there is nothing done in the ECM to reset the acceptable boost levels, so yes 38-40 should be throwing a code.

If the WG setting is off there should be no overboost code at less than 44 psi.

 

Interesting theory but all the data directly refutes it.

WG option on or off, boost reference line plugged, and Smarty loaded I can boost to 40 psi all day long with no overboost code and no performance degrade.

WG option on, WG contoller functional, Smarty loaded and it will never see over 35 psi of boost I don't care how hard you twist its tail. No over boost codes, no performance degrade.

WG option on or off, boost reference line plugged, Smarty turned up and somewhere around 46-48 psi an over bosst code is going to show up. I can go 42-45 without issues most of the time. The correlation between boost and a code is a gray line, it could be anywhere from 44-48 psi from what I have seen.

The over boost code is not a hard and fast number, it is essentially a reading beyond the upper limit of the boost table. Thats the way about all these table driven programs work. The WG control set number seems to be an actual hard and fast number, but, only for the WG circuit. I have seen no effects on boost or codes with it on or off AS LONG as Smarty is loaded.

 

Your data is the first I have seen the refutes it. There are many conversations about hard over boost codes (CEL) at 35+ psi when the WG is on and either boost line blocked or aftermarket turbo installed. The ~44psi is a soft code and shouldn't set a CEL, and is a different code for the MAP sensor going out of range.

I still say the OP should try WG off and see what happens.

 

Thanks for the insight gentlemen. Here are my following questions?
How do I limit my boost, The SR has no option for that? Should I buy an electronic boost controller or is this where a boost fooler comes in, also another code pops up but not as often stating reduced pressure to the CP3 regulator. If I am running on the ragged edge of stock components would a lift pump save me?

 

It does sound like your pushing all the limits of the stock setup.

The only way to limit it is to reduce fueling. Based on what I have seen the WG blows open above 35 psi of boost and 2700 rpms, so your probably doing that already.

If your getting that CP3 code (fuel output not input, as the ECM doesn't monitor input) you are severely draining the rail and probably need CP3 and lift pump upgrades.

Are you running Revo or TNT?

 

I am on TNT SW4

 

Lots of conversations about lots of things lead down rat holes that never surface. The bulk of the testing and inference done says it operates the way I described. All we can do is infere from know programs what is actually happening because nobody has broken and posted the actual code used to drive all the engine operations.

Your mixing up 2 distinct codes and monitoring here. An overboost code is a reading that is beyond the boost table. You can get a soft overboost code from a spike that wil not set a CEL but if the range is sensed for too long it becomes a hard code and further action is taken. That is a typical programming algorithm for handling these types of situations.

A MAP reading out range for too long is another set of codes. They have distinct sources and meanings.


List the codes please so we know which ones are showing. To limit boost add a boost elbow to the boost reference line on the trubo and tune it for what you want as a max value.

How are you reading boost? Electronic or analog gauge?

Not in a normal setup. About 55 psi you might start the WG opening but definitely not at 35 psi. If the WG is actually opening it is being influenced by boost.

 

I have an analog gauge referencing from the intake. I will have to look further into this boost elbow. I always thought that was the part that came from the intercooler to the engine (andwhere I drilled for my boost reference)...lol. Ouch.

I will load the codes as soon as I can. Can the Smarty snag code history?

 

Yeah, TST has the boost elbow on their site. It is just a fitting with a set screw that allows you to adjust how much boost gets applied to the WG actuator. That is th eonly way to adequately control boost.

Do you have a stock turbo and the WG controler still hooked up and working? Does the boost spike to these levels and drop or hold there?

I am amazed you get that kind of boost with the WG controller active. Might have to revise my understanding of how that circuit functions.

Smarty will show you the codes and descriptions although its rather ugly.