Why will not make more the the mid 20s in boost? I have even gone as far as unplugging the wastegate vacuum line. It my gate stuck open? It is an HX35. I looked around here and did not find alot but I did find some info saying I should be able to make more then 24psi. I have a bulldog and even with it set to 100% I am still not getting into the 30s. You can hear the engines tone change as you go from 0 to 25 to 50 ect. But no more boost.

Am I just stupid and missing something here?

 

sounds like your turbos on its way out maybe... does the blades move freely in the turbo? or is it real hard to move the spool?

 

I will check it and find out. Wow I need to not post in the early AM as even I just had a hard time rereading what I wrote.

 

is your truck smoking? if you aren't then you don't have enough fuel to make those types of boost numbers.

you must have more fuel than that to make that ammount of PSI. your truck could also be defueling and causing you to have low boost numbers.

but the main thing to look at right now is, is your truck smoking at WOT?

 

Ok went out and looked at the turbo. Yes she spins but she is no freewheeling ball bearing. If I give her a good spin I might get 2 rotations. No real shaft play in any direction. I did notice a crack in my manifold. Nothing I would consider massive but you can see a small trace amount of soot around it so it is leaking a little. I will look into a new manifold.

As for the smoke. With the Bullydog on 100% yep she smokes. Well maybe a heavy haze is a better term. I will not be blacking anyone or anything out. But as boost comes up she clears up to a very light mist. When I put the Bullydog on I noticed the EGTS read way higher then my old Pricol gauge did with the sender in the same location. Now this may be my fault as I am not sure if it thinks it is pre or post turbo. (It is pre and I will look into that.) So I upped the Bullydog'd defueling to 1600* as it was reading 1400-1500 under load. Old one never went over 1250* under full throttle from a stop to 100mph. I did take off my Pricol boost gauge also so I am going off what the map sensor is telling the Bullydog now. But I can hook it back up if I need to.

You can really hear the trucks tone change as you up the Bullydog's power level from 0-4 at idle. When you hit 3 it almost makes a shuddering sound but it may just be harmonics. I will try to get a video of it running at idle and upping the power. And a run from a stop.

Just in case anyone needs to know.
Truck has new VP44, New Airdog 150, New +75hp injectors, New Bullydog Outlook with Power Enhancement.

I am not expecting 239823702370hp out of this setup. I just was expecting a little more then she has.

Maybe I was just wishful thinking?

 

Possible Boost Leak

 

that exhaust leak would be my first fix, then look for a possible boost leak as Luke suggested. after that i would look into an electronic suggestion on why you aren't fueling more than you are now. if the truck clears the smoke to a slight haze then to me it is tuned properly at WOT.

what does scare me is the EGT's. i have heard some mixed reviews on analog vs digital EGT gauges. with the Pricol did you have any power adders like the bullydog or the injectors? if not then that is why the EGT's were lower with the pricol gauge before you installed everything else. once you add more fuel the EGT's will get hotter a lot quicker. if you have been running 1400-1500* constantly or for multiple timeframes then that is why the manifold cracked. be glad that it wasn't the top of one of the aluminum pistons burning a hole in it as 1250-1300* is about where the melting point starts....

one thing you could look into to get the EGT's down is a good quality air intake system and a good quality high flow exhaust system. the exhaust system won't help out much because of the stock bottleneck on the back side of the turbo. doing these 2 should give you quicker spoolup, lower EGT's and a couple more PSI.

also on the bullydog box did you tap the pump wire? do you have a boost fooler on your truck to keep the stock ECM from defueling when the truck sees high boost?

 

I will get the exhaust fixed. But at this point I really do not see it being the main issue.

i ran the truck around for a while after putting on the Bullydog with it on 0 (stock) setting and that is when the EGTs went crazy. I can pop my old unit back in and watch it. maybe the new sender just needs broken in? I baby this truck and I can assure you it has not seen a real 1300*+ for any real amount of time (seconds if that).

Butting the box on 4 really does not see a lot higher temps. I will just drive it around and see if she changes.

As for intake and exhaust. Well I am just not sold on an air intake. A large clean filter works just fine. But I will not debate you on this. As for an exhaust yes a larger one is always better behind a turbo. But putting a large tube behind the stock elbow is not the bright to me. Kinda like just falling short. It then becomes the biggest restriction. My turbo has 240k miles on it so I may be looking for a new one later one with a larger exhaust elbow then do an exhaust.

I checked all my joints and they are all tight and the boots look good. I will make a pressure tester for it with a cap on the turbo inlet and one blocking off right before the intake and see if I find anything.

No wire tapping on the Bulleydog per say. You do use a plug up by the pump maybe that is what you are talking about.
Check it out. http://www.bullydog.com/external/pro...s/BD_42002.pdf
No boost fooler maybe that is the problem?

 

the boost fooler could be the MAIN problem.... they aren't super expensive, maybe 60-70 bux or so...., but that crack in the exhaust manifold will lower the drive pressure turning the turbine wheel causing it to not build the boost it could build without the leak. with the drive pressures that the HX35 has over 30psi a crack of any amount can hinder performance.

on the filter i won't argue, anything is almost better than stock....

i wouldn't charge that turbo to the game just yet, though there is that possibility that it *might* be the problem.....

before I'll tell you to spend $1200-$1400 on a new turbo and $500 on an HTT or ATS manifold (i would recommend one of these over another stocker that will crack again) i would get a boost fooler, and if that doesn't work i would find someone that has another brand of a programmer that will let you test it on your truck to make sure the bully dog isn't bullying you around....

 

Quadzilla Boost Fooler