So about a couple weeks ago i sent my old Edge box off to exchange for the new version 12.5. Over the week that it was gone i took the intake horn off and augered that out like others have done on here. When i got the edge back i took it out for a drive and was not very happy. Now i can only get 24psi boost, the occasional 25 shows up but not very often. Today i checked the intercooler pipes for holes and found nothing. I also put a vise grip on the wastegate hose and drove it, my boost didnt change at all when i did that. So is it possible that the intake horn mod caused me to lose boost?? Or is it something with the new Edge box? Im not sure what else to do.

P.S...I used to be able to hit 28-30 boost easy.

thanks guys

do you hear any extra noises or anything of that nature from the turbo or motor?

The odd thing here is that the stock turbo should have been producing 22-24 PSIG boost from the get go. Thats where it is gated at. perhaps when the edge was sent back the fuel curve was lowered, and there is no longer suficient drive pressure to achieve the boost you're looking for.

there is no extra noises that i can tell of anywhere. Shouldn't it make lots more boost with the wastegate blocked off? Im confused and mad

The spring inside the actuator is sufficient enough to hold back the exhaust pressure needed to produce about 28 PSIG tops. Anything more than that and you'll need either a different actuator or to madify the stock one.

Tug on all of the plumbing a little. I kind of wonder if you have an i-clr pipe blowing away from a coupler and its not happening until about that pressure.

The spring inside the actuator is sufficient enough to hold back the exhaust pressure needed to produce about 28 PSIG tops. Anything more than that and you'll need either a different actuator or to madify the stock one.

Do mean an acuator for the waste gate? I tried moving the rod that comes out of the wastegate and it didnt move. im not sure which way its sposed to move or how hard it should move so i didnt mess with it to much, if that dont work could it be causing a problem?


Tug on all of the plumbing a little. I kind of wonder if you have an i-clr pipe blowing away from a coupler and its not happening until about that pressure.

I kinda messed witht them today when i checked if they had any holes in them.


When i was doing the intake horn mod i had removed an air sensor so the wores were out the way, i think that the boost sensor, could that have been damaged?

I bet its the tune.

Do mean an acuator for the waste gate? I tried moving the rod that comes out of the wastegate and it didnt move. im not sure which way its sposed to move or how hard it should move so i didnt mess with it to much, if that dont work could it be causing a problem?


The wastegate actuator is most likely working just fine. The push-rod won't move easily, it has to hold back quite a bit of pressure. If the boost pressure dropped, you either increased airflow capacity in the system post-turbo, or lost drive pressure, asuming no leaks. what level is the edge on?

I tried the edge on all stages i cant get more than 24lbs out of it.

Im starting to think i have to have a leak somewhere cause when i took the edge out to send it back i could get 30lbs boost, at least the last time i tried to get that much. Yesterday when i blocked the wastegate and drove it i still couldnt get more than 24, with that blocked i would think 30 would be easy to hit. So that tells me that the programmer isnt causing the problem. Im gonna do a more intense check for leaks today hopefully i find something.

Any other ideas??

Maybe its something Edge corrected. There programmers were reading absolute pressure, so the end user always saw 14 lbs higher than actual. Maybe they just programmed in the correction factor so the gauge read actual pressure instead of absolute.

^But i didnt lose 14lbs of boost. Before if i stood on the throttle i would normally top out at 30-31, now its at 24-25.


I did some more investigating today and didnt really find anything. All the intercooler pipes look good, also tightened them clamps all up a little more. Changed the fuel filter. Took the hose off the wastegate and put a vise grip on it took it for a drive, and again i saw 24-25 all the time. With no wastegate hooked up that thing should makes lots of boost i would think. And doing the 0-60 test on the Edge the truck is roughly 1-1.5 seconds slower than it was before.:mad:

The only thing i found today that bothered me was the wastegate/actuator. I hose clamped the one end of the hose on the wastegate and the other end of the hose i put to an air hose. First i set the air pressure at 30lbs and the wastegate didnt move at all, it took about 60psi to budge it and it still didnt open up all the way. I did clamp a vise grip on the rod from actuator to wastegate and moved it around a few times to verify thats its not stuck. Is this normal or would this affect anything that im seeing.

Tired calling Edge today but couldnt get through to anyone so i gave up on that. I have a friend thats got a 03 LB7 so im gonna try switching Edge modules with him and see if that changes anything.

^But i didnt lose 14lbs of boost. Before if i stood on the throttle i would normally top out at 30-31, now its at 24-25.


I did some more investigating today and didnt really find anything. All the intercooler pipes look good, also tightened them clamps all up a little more. Changed the fuel filter. Took the hose off the wastegate and put a vise grip on it took it for a drive, and again i saw 24-25 all the time. With no wastegate hooked up that thing should makes lots of boost i would think.
No, it will only make as much boost as there is fuel to make the exhaust pressure to produce that boost. And doing the 0-60 test on the Edge the truck is roughly 1-1.5 seconds slower than it was before.:mad:

The only thing i found today that bothered me was the wastegate/actuator. I hose clamped the one end of the hose on the wastegate and the other end of the hose i put to an air hose. First i set the air pressure at 30lbs and the wastegate didnt move at all, it took about 60psi to budge it and it still didnt open up all the way. This is normal, keep in mind, the actuator isn't only holding back boost pressure from the compressor signal line, but also exhaust pressure, which can be significantly higher than boost pressure being produced. I did clamp a vise grip on the rod from actuator to wastegate and moved it around a few times to verify thats its not stuck. Is this normal or would this affect anything that im seeing.

Tired calling Edge today but couldnt get through to anyone so i gave up on that. I have a friend thats got a 03 LB7 so im gonna try switching Edge modules with him and see if that changes anything.

Bein that the update on the module is the only thing that has changed, I'm willing to bet that there is where the issue (if you want to call it that) lies. The module may be seeing boost coming to a maximum limit that it has newly programmed in and reducing fueling to keep boost in check. Something you should keep in mind, I have personally demolished...Yes DEMOLISHED...2 stock turbos at 31 PSIG boost. They are just not designed to boost up that high. People say 32 PSIG is safe, but I ate 2 at 31, so you decide for yourself if this is still worth persuing. Good chance that Edge programmed in a safety feature to spare you the cost of a turbo.

I heard anything above 28 PSI is making the stock turbo inefficient anyways. I had my boost controller turned up to make around 31 and have since scaled that back to 29 PSI after reading some of the stories like Mike S. just explained. Those were true boost numbers from a mechanical gauge.

I understand what you guys are saying but my truck is rediculous right now. It dont even spin the tires if i floor it from stoped. Also its really crappy pulling anything, it needs to be in tow/haul or it can barely do it since it runs like 1lb of boost going down the road.

I talked to Edge today they are sending me out a new juice and attitude to try and see if that takes care of the problem.

Try this. Just once and see. Hit the enter button twice real fast and go into the "disable backdown" screen. This will ignore all safety settings for max boost and EGT and will dump fuel as commanded. Watch your boost and EGT and see what you get. Don't do this if you see your boost climb or EGT skyrocket, you don't want to make matters worse.

Do this and report back your findings please. If this doesn't help, Edge needs to help you.

Its the tune. Its the tune. Its the tune. Its the tune. jeez.

Your stocker will goto 40psi. Ive done it plenty. But....your out of the compressor map. 28-30 is the sweet spot like stated before. This again depends on your tuning........solely on tuning.

i disabled backdown and nothing changed, even with the backdown active it wasn't backing off any power anyways.

I have a friend with a 03 LB7 with edge juice, i grabbed his juice tonight and put it in my truck to see what would happen. I still didnt get any more boost out of it but the egts got higher under hard acceleration and in stage 5 it backed down 100% of the power so it was definatley better than my box.

Edge is sending me a different attitude monitor they thought maybe the attitude wasnt communicating with the juice the way it should. If that dont work i will send all my stuff back to them and they will check everything over and send it back.

If i still dont like what i get im going with efi.

Its the tune. Its the tune. Its the tune. Its the tune. jeez.

Your stocker will goto 40psi. Ive done it plenty. But....your out of the compressor map. 28-30 is the sweet spot like stated before. This again depends on your tuning........solely on tuning.

You are INCREDIBLY LUCKY. If your turbo has hit 40PSI at the manifold inlet more than once and is still functioning and not in a thousand pieces you are the luckiest person I have ever heard of. at that boost pressure the turboshaft would be spinning upwards of 175 thousand RPM, NOT good for the compressor wheel. and, actually, 20-23 is the sweet spot on these turbos, not 28-30. At 30 PSIG you are creating more heat than dense air, and its a toss up weather it is worth the extra stress on the turbo.

Mezzy, regardless of what happens with your edge, you need to ditch that thing. $40 for a dsp5 switch, $100 for a vin license, and you buy the beer. We can have your truck running like a champ in no time.

Its the tuner, I am running the new 12.5 version and it sucks. Not nearly the same amount of lowend power as when I was running version 2.1. My boost tops out at around 22 now when I would see 28 -30 before.

Ok. I have the new version as well. I just clamped my wastegate line closed and checked one run. I pegged the 30psi mechanical boost gauge i have. So it WILL do it. The tune is different, but capable.

At least im not the only one having problems. As soon i get this figured out im getting EFI and piggyback the edge so i still have the nice display.

At least im not the only one having problems. As soon i get this figured out im getting EFI and piggyback the edge so i still have the nice display.

I would seriously NOT recomend that. Pigy backing the Edge with programming is not a good idea given the fact that you don't know what the edge is doing to timing/pulse widths ect. And don't think that you can set the edge to level 1, cause as long as that box is connected it is altering engine parameters. Do what you like, But I would definately not recomend it.

I would seriously NOT recomend that. Pigy backing the Edge with programming is not a good idea given the fact that you don't know what the edge is doing to timing/pulse widths ect. And don't think that you can set the edge to level 1, cause as long as that box is connected it is altering engine parameters. Do what you like, But I would definately not recomend it.

Thats why i said "when i get this figured out", im not gonna do anything till i get the Edge thing straightened out. And when the Edge is on 0 or stock, it is STOCK. Ive talked to 2 different people at Edge and the both told me there is nothing changed when on stock level, including timing. The only reason im pigy backing is to have the attitude monitor, i dont like how analog gauges look im not gonna put them in.

I would seriously NOT recomend that. Pigy backing the Edge with programming is not a good idea given the fact that you don't know what the edge is doing to timing/pulse widths ect. And don't think that you can set the edge to level 1, cause as long as that box is connected it is altering engine parameters. Do what you like, But I would definately not recomend it.

http://www.dieselplace.com/forum/showthread.php?t=307812&highlight=stacking+edge

Do what you like, but be aware, at the very least this is just one more possible failure point. I still don't feel that this is a safe practice...as you read the comments from the edge reps. and they say "there SHOULDN'T be any timing added," which gives me doubt.

Well Edge sent me out a newer version attitude monitor thinking that the older one wasn't communicating with the juice properly. Well, i got that put in today, and, for some reason that helped my truck alot. I drove it a little today and i hit 28lbs of boost, off the line the truck is totally different than it was. The tires even squeeked a little shifting into 3rd gear on level 5, builds boost waaayyy faster also.


FYI: My older Attitude monitor was version 1.9, the new one they sent me was version 2.99. So if you having any issues i would call them up and tell them you want a new attitude monitor.

glad you got your truck back up runnin the way it should :) It sucks when they aren't runnin right.

^^Yes it does, now i just wish i had the money to build the trans and run efi