OK, I have done a ton of searches and seen numbers all over the place. Can anyone give me a straight answer on what the stock turbo boost is at it's max?

Here is a bit of background:

I just installed an Edge w/Attitude. I'm enjoying (and being careful with) the new-found pep. What surprised me was the low (single digit) boost readings I have been seeing. It seems that even under hard accelleration with a load, it has not topped 10 PSI. My only reading is from the Attitude monitor.

I'm just curious if this is normal or if it is an indication of another problem.

This is at sea level, Attitude on #3 setting, 02 with 71K miles on it. If anyone needs more info, let me know.

Thanks for the help in advance!

22 psi is what I have been told. Max I have seen on my boost gauge is 20 psi.

My 2003 LB7 shows 20lbs at stock setting, with Superchips level 1 & 2 shows 22lbs, level #3 shows 24lbs

Hope info helps

the most i see on my edge is 23

hey duff banks has the big head out which you can adjust it to what ever you need it to be at. i adjusted it to 29 psi

mine has seen 21 in hot weather and 22-23 in cooler temps,on the edge,most any settings are the similar.10 is way low under full boost,maybe a gm sensor problem? i think thats where the edge gets it info from?

10 is way low under full boost,maybe a gm sensor problem? i think thats where the edge gets it info from?

I agree. The Edge reads boost from the sensor, not from the intake. Sounds like a sensor issue.

Thanks for all the inputs, guys, it looks like I'm running WAY low. Now I just need to figure out if it is the sensor or somthing mechanical. I tend to think it is something mechanical, as my d-max has been "doggy" for quite some time. I imagine only having 9 or so PSI of boost would take a chunk of the power away.



By the way, I'm not smoking at all. I almost expected it when I installed the Edge, but it never happened. I've had 3 injectors replaced about a year ago and no real issues since. It just didn't have the punch I remembered. I figured it was just me getting used to it. Now I have a number that is backing up my gut.



Suggestions on my next course of action? Can the sensor be checked without breaking the bank? :help2:

Again, thanks for the input... ya'll ROCK!:ro)

10 is way low, max you should see with the edge is probably 23 and the max for the stock turbo you dont want more than 34psi.



something is definately wrong. how does the turbo sound?

edge will only smoke on top settings and only until the turbo catches up to the fueling. it wont be black it will be gray.

most i ever boosted with my edge was 23 and i was in it hard. after i purchased the KD boost valve i will boost 20 just barely getting on it.
i wouldnt boost more than 32psi on a stock turbo

most i ever boosted with my edge was 23 and i was in it hard. after i purchased the KD boost valve i will boost 20 just barely getting on it.
i wouldnt boost more than 32psi on a stock turbo

34 is usually the kaboom point. 32 should be good

I can regularly see 23 and have seen 25 a couple times with an autometer guage. Ive heard yu dont wana exceed 31/32 psi boost.

According to my gauge I was getting 22psi max with stock setup. With my hypertech on III I see 26psi max.

With the predator or the juice even stacked on my 2002 it would read max at 26 Lbs. never anymore though.

With the predator or the juice even stacked on my 2002 it would read max at 26 Lbs. never anymore though.

thats because the juice fools the ecm, if it was reading 26 you were over 26...

10 is way low, max you should see with the edge is probably 23 and the max for the stock turbo you dont want more than 34psi.

something is definately wrong. how does the turbo sound?

The turbo sounds normal. It spools up like it should without a lot of noise (never can hear a d-max turbo that well) but there are no strange noises or anything. Everything sounds/acts normal. It's just like someone turned down the boost is all.

I've considered getting a banks big head, but I want to be sure I am treating the problem and not a symptom. If it IS a sensor, I could grenade my turbo with a big head trying to get it to run normal boost pressures... don't want to do that!

Put a regular boost gauge on it so you know exactly what it reading. they arent very expensive. I think the edge will only read so high then quit.

edge reads up to 26 or 27 then quits

I have an Autometer gauge and it reads 26 psi with my Edge box on level 5. My Attitude monitor will read 25.9 The same when I check the recorded boost in the monitor. My truck stock (before the edge box) read about 23 psi on the Autometer gauge.

I bought a gauge today that reads up to 30 PSI... now I need to figure out where to mount it.

I was going to tap the intake, but the heat is pretty good there and I am worried about melting the plastic tube for the gauge. Is this worry legit? Second option is to tap in to the bypass activation line. It is rubber and would insulate the gauge. Anyone see a problem with doing this?

By the way, I have been watching the Attitude's boost levels. I have NEVER seen it go to 10 PSI, so my max is still single digit. Second, I seem to be running about 3-4 PSI on the highway (flat, no head/tailwind, constant speed).

That number is relative, as I still do not know if the sensor is reading accurately or if there is a problem with the mechanical adjustment of the turbo/actuator. Speaking of the turbo, I had the intake TUBE OFF TODAY and could see the intake blades. They look clean and undamaged. I started the truck for a sec and shut it off... turbo took around a minute to spool down without any vibration or noise. It seemed to run smooth like the bearings are happy.

I'm just adding more info to the puzzle. As soon as I get some feedback, I'll try to get the extra boost gauge installed and verify the readings.
Thanks for the help guys!

A tee into the waste gate (bypass activation) line is the easiest and the quickest. Then if you want to do a more permanent install later all you need is a new piece of line. Been there, Done that.

I agree. 32 is the max that I went. 34 and you better have already started a turbo fund.

Nick

A tee into the waste gate (bypass activation) line is the easiest and the quickest. Then if you want to do a more permanent install later all you need is a new piece of line. Been there, Done that.

Thanks for the help, guys, I'll see if I can finish it up today. I really want to know if I have a sensor or a mechanical problem.:confused:

When i disconnected my wastegate i got up to 37....it was fun but then I hooked it back up...i run about 31 with my banks big head now.

Duff, i would check into the MAP sensor. thats what reads the pressure for the ECM and the Edge. If the ECM is only seeing 10psi boost it will not give you full fuel. that is why you are not smoking. let us know what you see when you get the gauge hooked up!!

JESSE

I've hit 24 lbs in level 5 before, but that was just for a bit.

Ok, the mystery gets a little less mysterious...:muahaha:

I installed an aftermarket boost guage and took it out for a spin. Right away I noticed a big difference in the boost gauge versus the reading on the Attitude. It (the gauge) spooled up faster and higher than the Attitude (in analog mode)(As expected, there was no difference in readings in the digital mode). I got on it hard and watched the boost run up to around 24 psi max. A LOT more like what I had expected. By the way, I tapped in to the bypass line to check the boost. Just added a 'T' fitting between the intake and the vacuum (boost?) canister that actuates the turbo bypass.

So, here are the questions:

1. What is wrong?

I could assume it is the sensor, but it could be my Attitude. (I have occasionally been accused of having a bad attitude) :lol:

2. What to check next?

I DID check the voltage going in to the pressure sensor and it is right at 5vdc, just like the label indicates it should be. (Checked with the engine off and the ignition on)

3. How much is the sensor?:help2:

I know the local steeler will prolly hit me hard in the pocket book for it. Here is the info off the sensor: 09373269 Sensor, Pressure 1331.

4. Where is the collective beer fund that I donate to that pays for the drinks ya'll deserve for all the help? :ro)

Thanks again for all the :help: !

I would more than bet it is the sensor. Does your truck smoke at all with the Edge all the way up? You could probably buy a sensor for pretty reasonable at gmpartsdirect.com.

JESSE

Drop the 0 from the part# and gmpartsdirect wants $65.09 (handling included)

Duff,
Sunset Autocenter can be hit and miss on parts (and price)...give them the part# and they will give you the price. If you can get in there on Monday and they don't have it they should be able to get it by Wednesday or Thursday at the latest.

I would more than bet it is the sensor. Does your truck smoke at all with the Edge all the way up? You could probably buy a sensor for pretty reasonable at gmpartsdirect.com.

JESSE

No smoke. :D

I'm thinking (I hope my logic is correct) that the ECM is not dumping as much fuel because it isn't seeing the boost needed to dump the full amount. Now that I have the edge, I'm getting more fuel (and more power) because that is what the chip is designed to do. I may actually be making "normal" power now. I'll know if it goes up even more when I replace the sensor.

Speaking of the sensor, I have not found anywhere online that sells them. Not sure what I'm doing wrong, but I can't seem to locate it.:confused:

Drop the 0 from the part# and gmpartsdirect wants $65.09 (handling included)

Duff,
Sunset Autocenter can be hit and miss on parts (and price)...give them the part# and they will give you the price. If you can get in there on Monday and they don't have it they should be able to get it by Wednesday or Thursday at the latest.

Thanks Dmx!

I hit 28 psi on my edge display

OK, folks, things are working the way they are supposed to and WOW what a difference it makes! :ro)

I went to a local dealer and bought the sensor. It is just 1 8mm bolt to swap and is easily accessible. I swapped it in the parking lot at the dealer and then drove the 20 miles back to work.

Just after I started it, I heard it hiccup a little, sort of like it discovered a new part it had been missing. I then set the Juice to 0 so that I could see if there was a difference.

The first thing I noticed was the power was still there. I had noticed a nice increase with the Edge (dumping more fuel) and it was STILL there. In fact, it pulled like my buddies stock duramax pulls.

Second thing I noticed was the boost numbers climbing like they should. The analog gauge and the Attitude were matching pretty closely. That was a good sign.

Finally, the Edge on level 3 was a nice surprise... it flat-out pulls now!

Now to the problem... anyone know what would get things this hot?

http://www.duff.ws/duramax/sensor1.jpg
http://www.duff.ws/duramax/sensor2.jpg

As you can see, I was lucky the center didn't break off while it was still in the engine, although it was post-turbo so it would have probably gone through without hurting anything.

I had 3 injectors replaced about a year ago and could swear I noticed a loss in power afterwards... wonder if the mechanic could have gotten the engine that hot. Regardless, it's fixed.

Thanks to everyone who replied and gave me the information I needed.

:ro)

I Hit 22 On Mine Today....stock Motor...autometer Gauge..

Nice pics, Glad to hear that eveything works:) . Looks like it got a lil' heat to me.... I am getting 24/25 stock level 5&6, soon to come is the big head from Banks that I'll push to 30 just to be safe till I get the New Hair Dryer... Too many things to buy... Really need to get the tranny done though. :blahblah:

I have read this whole thread an now I am wondering if I should replace my sensor. Can this thing be checked? Will I get a code? I have the Hypertech on Stage III and I have to push it harder than I like to get any smoke. Any thoughts? I am not one to just replace things if not needed.

Thanks

I have read this whole thread an now I am wondering if I should replace my sensor. Can this thing be checked? Will I get a code? I have the Hypertech on Stage III and I have to push it harder than I like to get any smoke. Any thoughts? I am not one to just replace things if not needed.

Thanks

I NEVER got any kind of a code. The only way I knew something was wrong was when I got the Attitude installed and saw the single-digit numbers on the boost.

Having said that, $65 & some change is pretty cheap troubleshooting compared to what you could pay at a dealer for just a diagnostic check. The only other thing you could do with it on the truck is to check to make sure the connector is getting the 5vdc is should. The connector is labeled and should be easy to figure out. If you had the right equipment, you could measure the resistance over the connector while applying pressure to it to see if it worked correctly, but that would way more trouble than $65 and 2 minutes to swap the sensor.

Just my .02!

Ok this maybe a stupid question, but where is this thing? Can some one post a pic of is location?

34 is usually the kaboom point. 32 should be good
is that what you heard or is that what youve seen?

is that what you heard or is that what youve seen?


People learning from the people who pushed the envelope beforehand.

5 turbos to find out the limits. 32 is safe. the further you go above that, and the risk increases exponentially.

People learning from the people who pushed the envelope beforehand.

5 turbos to find out the limits. 32 is safe. the further you go above that, and the risk increases exponentially.

got to love the envelope pushers):h :ro)

got to love the envelope pushers):h :ro)


Where were you when I had to replace them?:D

Ok this maybe a stupid question, but where is this thing? Can some one post a pic of is location?

I don't have a pic, but it is easy to get to. The sensor lies just under the left edge of the "6.6 Turbo Diesel" engine cover on the top of the intake tube. If you look for the blue coupler on the left side of the engine and follow it toward the center, you will run right in to the sensor.

The most I ever saw on my 03 was 18 but big head solved that problem.

mine hit 21 stock and 29 with tuning, i hear over 30 youre starting to roll the dice

:exactly: mine hit 21 stock and 29 with tuning, i hear over 30 youre starting to roll the dice

Thanks for all the inputs, guys, it looks like I'm running WAY low. Now I just need to figure out if it is the sensor or somthing mechanical. I tend to think it is something mechanical, as my d-max has been "doggy" for quite some time. I imagine only having 9 or so PSI of boost would take a chunk of the power away.



By the way, I'm not smoking at all. I almost expected it when I installed the Edge, but it never happened. I've had 3 injectors replaced about a year ago and no real issues since. It just didn't have the punch I remembered. I figured it was just me getting used to it. Now I have a number that is backing up my gut.



Suggestions on my next course of action? Can the sensor be checked without breaking the bank? :help2:

Again, thanks for the input... ya'll ROCK!:ro)
You may have a boost sensor issue, and if you do, the ECM will not turn on your full fuel delivery without seeing more boost than you described,hence low power!

I would recomend a mechanical boost gauge. I use a good quality mechanical boost gauge together with my Juice Attitude gauge and they don't completely agree!

:eek:damn I hit 34lbs twice today with the edge on level 5/5 today but it would only go over 30 if i floored it from a roll not from a dead stop. I also got a 5.9sec on my 0-60mph):h.