Turbo Questions/Options/Trouble Shooting

4x4dually

4x4dually

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So, I've lived with the II PS62/65/14 since I put in on a couple years ago. Every winter, I fight the same battle. When the intake air is less than 100F or so, and the outside air temp is 75F or less, the turbo barks/shudders/stumbles or what ever you want to call it. The heavier the load (like a trailer) the worse it is. It is to the point where you either have to back off the throttle or just get out of it completley because I feel like it is going to bark once too many times and end up in the glove box.

Also, I've recently upgraded my Jammer IV's to a good set of DDP 100's. And constant pedal, running about 70 mph at around 2000 rpm, I have a small trail of smoke out the stack. I'd love to change something and get rid of the smoke. The truck hazes slightly at max pedal and never completely clears up. I've also notice MPG is crap. I tow a lot and normally run the truck on Edge Level 2 all the time. Level 1 and 0 don't do a lot for clearing it up either.

Questions: Does A/R affect this? How? Do I need to upgrade this turbo to get clean or do something different? I can't just go buy a nice set of twins but I can probably trade for something or pay for some mods that aren't a whole lot. I've heard a lot about the timing causing the bucking and some have put a pot on the IAT, but does that really work or is it just polish for a turd?

New IP, New DDP 100's, ECM reflash, AFE II intake, FASS 95


What do you all think? I'd like to keep this size turbo and my 450 hp AND I tow a lot so I don't want to make it more laggy if I can, but I need to do something because it just isn't right.
 
The PSI while at 70 mph at 2000 reads about 4 psi. How do I boost that a little at the same engine speed to make more air? Is that the A/R? I know, I'm dumb. :D
 
Tighter a/r (smaller number) will make the exhaust drive the turbine harder than with a bigger a/r. I may be able to get ahold of a 12 if you want to try it.
 
the point is it takes X amount of power to maintain a given speed... if you put a smaller turbine housing on, you'll have higher boost at that same speed, but you're not really going to be using more fuel...

with my VNT, I can set boost pretty much wherever I want... I've done tests on the highway... this past winter, it was cold enough outside, that I could set it to where I was making zero boost at 69mph and still keep EGT's cool... on the return trip that same cold weekend, I had it set up to make 7-10psi at 69mph, and the fuel mileage was just shy of 17.5mpg both times

now, if you're comparing an HE351 with a 60mm turbine and a 9cm housing, your fuel mileage will probably be worse than with a 65mm turbine and a 14cm housing (though not much worse)

but going one size smaller on the turbine housing shouldn't effect fuel mileage a noticible amount

BUT, if he's getting compressor surge with the 14cm, it's only going to get worse with the 12cm
 
have you checked your apps voltage? it may be a little out of whack, causing the surging.. just another freeby to try before throwing more money at it lol..
 
I have calibrated the APPS at the pin on the PCM (firewall box). I adjusted it to read the same as the number on the sensor sticker.

The surging is between 18 and 25 psi. If I push about half pedal and get it into this range in the cold, it jumps around. Now, if I floor it, it goes to 40 psi and stops. But, I don't want to floor it with a load so I usually let off and then get out of the "good" spot and smoke like hell trying to get it back. I love this 14cm as far as cooling. My egt's are always in check loaded heavy or "off the record highway racing". I really hate to go smaller and lose top end air, but it sucks right now.

Same ol' delima...lag or performance...quick spool or air.... Anyway, if there is something I can change and not sacrifice a lot but help drivability, I'd consider it. I'm not worried about mpg much as it sucks now, but I don't want to be one of those guys that goes around smoking all the time and getting a bad name. I'd like to clean it up and keep the power...another age old delima. :D
 
My original thought was to put a scoop on the hood and close in the air box and force air into it. Would that help or is that a wasted effort? And I know someone would call me gay for a hood scoop too. LOL
 
I have surging at part throttle with my quadzilla adrenaline and big haisley sticks, but I am getting used to it now. Occasionally I have issues with my APPS sensor which could cause this. But when I replaced my fuel filter I got a little less surging. I also had surging when I had my 62/65/14 on it as well, which leads me to believe that my issue had nothing to do with charger or exhaust housing size.
 
Things I've done:

Replace APPS (from displacetexan) and calibrated it. I can view the % throttle on my Murphy guage and it is calm and still at any %age.

Like I said, new IP, new fuel system from FASS, cleaned air filter, reflashed ECM with DRB tool. No codes or issues.

Edge JWA has been back for testing twice.

Talked to II and they say it isn't the turbo.

It just really sucks that I've heard of at least a dozen trucks with this same issue and no one has a true fix yet. I wish someone would figure it out. Everyone blames it on the timing from the Edge. And to be honest, I too have learned to drive around the buck, but I'd really like to clean up the exhaust for normal driving so I'm not one of those asshats on "yourtube" being stupid.
 
what would happen if you were to go to a 71mm turbing instead of the 65mm you have now? think the surge would get worse? of maybe even out a little?

mine surges like hell, but im running a monster, silver bullet, smarty/edge drag, 6x16 injectors, and so on...
 
have the injectors popped for the haze, my 150's were hazing worse than these 200's, but 2 were bad!

my truck bucks and surges bad too with the stupid adr on, but turn it off its fine

if there is a lot of miles on the charger, maybe the fins have rounded and it's not so effiecient, have you considered a 68mm turbine? you should be able to ddp 100's shouldnt haze at all
 
weazel said:
what would happen if you were to go to a 71mm turbing instead of the 65mm you have now? think the surge would get worse? of maybe even out a little?

mine surges like hell, but im running a monster, silver bullet, smarty/edge drag, 6x16 injectors, and so on...
Click to expand...

I have NO surge with a 71mm wheel, hell It doesn't even bark more than once, there is no woosh...woosh...woosh, it's more like boww... and that's it
 
The injectors have maybe .... 3000 miles on them since brand new. Surely to heck they don't need tested again....but that's an assumption. I was wondering if the bump from a PS to a PSP (65mm to a 71mm) would help but I don't want to do it if it won't. The noise is more of a woosh woosh woosh and RPM's surge and dance around. I know the BARK. Happens everytime I shift when blowing the doors off the Titan that likes to race. :D

I'm the typical engineer, I don't want to spend money unless I know it will work. But...I would like to bolt something on and try it for a week if someone has one layin' around....hint hint hint....:hehe:
 
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