Compressor Efficiency Problem

SBCNX20

SBCNX20

Junior Member
Aug 7, 2006
354
0
16
53
Central MA
Killerbee said:
how much boost and rpm are you running?

remove the element altogether and test again. If it is still pulling toward red, trim off every other separator vane.
Click to expand...

I logged 30.5lbs max and have stock shift point so 32-3300ish.

I do have something else to add, after the MAF table change, the truck seems no faster than without>>> from ....2200 up (maybe weeker) all It seems to have done is add more smoke.

P.S Larry I still havent managed to load that PID yet.
 
SBCNX20

SBCNX20

Junior Member
Aug 7, 2006
354
0
16
53
Central MA
Killerbee said:
Back on the main theme, now that the primary heat source is id'd, the next step is tuning the VGT to include a software wastegate. This takes care of the other key component of Thermal Feedback, eroding Pressure Ratio.

The wastegate of the earlier IHI is truly what keeps the turbo operating within sane parameters. In fact, if you look closely at IAT boost, there is a mechanism that serves to exacerbate TF. As IAT goes up, LLY commanded boost increases. Ouch.
Click to expand...



Then the table (B2219) should be Zero everywhere correct? I run at tracks up here in N.H where fall track temps can be 40's and with the way that table is set up im loosing boost from
60F degrees on down.
 
Killerbee

Killerbee

Got Honey?
Aug 28, 2007
976
0
16
Phoenix, AZ-Low enthalpy air!
members.cox.net
SBCNX20 said:
I logged 30.5lbs max and have stock shift point so 32-3300ish.

I do have something else to add, after the MAF table change, the truck seems no faster than without>>> from ....2200 up (maybe weeker) all It seems to have done is add more smoke.
Click to expand...

can't help there. Sounds like some tuning issue. What MAF numbers are you logging with the new scaling.

30.5 with that rpm should be around 65-70 lb/min, with the new mouthpiece.

EGR is blocked?
 
Diesel Pilot

Diesel Pilot

Hat? Suitcase? 50 BMG?
Aug 9, 2006
1,424
0
36
47
Pickerington, OH
SBCNX20,

I would love to help out on the tuning side of the equation, I just can't seem to get my hands on an LBZ inlet to do the testing on my own truck. :p

Side note, I talked to my dyno guy last night at a truck pull and he is interested in doing side-by-side dyno pulls with my truck to see the actual power benefit of the LBZ inlet versus the LLY inlet.

Or maybe "someone" would like to send me their intake kit so I could test it. I'd be more than happy to blast the internet with proven dyno numbers and give that "person" mad props for an amazing intake design.;)

Hopefully, my dealer can scratch up an inlet in the next week or so.:dontknow:
 
SBCNX20

SBCNX20

Junior Member
Aug 7, 2006
354
0
16
53
Central MA
Diesel Pilot said:
SBCNX20,

I would love to help out on the tuning side of the equation, I just can't seem to get my hands on an LBZ inlet to do the testing on my own truck. :p

Side note, I talked to my dyno guy last night at a truck pull and he is interested in doing side-by-side dyno pulls with my truck to see the actual power benefit of the LBZ inlet versus the LLY inlet.

Or maybe "someone" would like to send me their intake kit so I could test it. I'd be more than happy to blast the internet with proven dyno numbers and give that "person" mad props for an amazing intake design.;)

Hopefully, my dealer can scratch up an inlet in the next week or so.:dontknow:
Click to expand...


D.P thanks for the offer but I found a guy that actually knows what he doing!!!! :poke: :joker:
 
mytmousemalibu

mytmousemalibu

Cut your ride, sissy!
Apr 12, 2008
2,230
0
0
Kansas
Killerbee said:
The wastegate of the earlier IHI is truly what keeps the turbo operating within sane parameters. In fact, if you look closely at IAT boost, there is a mechanism that serves to exacerbate TF. As IAT goes up, LLY commanded boost increases. Ouch.
Click to expand...


LB7 Baby! :happydance: Simplicity is nice some times! Now more airflow and boost??? Guess i shoud retract the happydance smiley! :rofl:
 
LarryJewell

LarryJewell

Back with his honey :)
Jan 21, 2007
10,152
0
36
58
San Angelo
Diesel Pilot said:
SBCNX20,

I would love to help out on the tuning side of the equation, I just can't seem to get my hands on an LBZ inlet to do the testing on my own truck. :p

Side note, I talked to my dyno guy last night at a truck pull and he is interested in doing side-by-side dyno pulls with my truck to see the actual power benefit of the LBZ inlet versus the LLY inlet.

Or maybe "someone" would like to send me their intake kit so I could test it. I'd be more than happy to blast the internet with proven dyno numbers and give that "person" mad props for an amazing intake design.;)

Hopefully, my dealer can scratch up an inlet in the next week or so.:dontknow:
Click to expand...


Any luck on that inlet yet, I'll be going to see my dealer in the next day or so, I'll check there for you :)
 
Stingpuller

Stingpuller

The Pusher Man
Jan 11, 2007
2,019
35
48
57
central Ohio
Diesel Pilot

Craig, If you want to barrow mine that would be fine just stop by the shop and pick it up. I started to pull the motor so I won't be needing it in the near future. I'm waiting on the pistons to get the block work done. Guy should be shipping my heads and cam so off we go!! I'm going to get the weight down on the truck and see if we can get a 9 sec. pass. I will see what kind of power a ally will hold at 5500 lbs. If it won't then I will try something else. Thanks Jeff
 
Kat

Kat

Wicked Witch of the West
Aug 2, 2006
17,899
13
38
60
Norco, CA
Stingpuller said:
I'm going to get the weight down on the truck and see if we can get a 9 sec. pass. I will see what kind of power a ally will hold at 5500 lbs. If it won't then I will try something else. Thanks Jeff
Click to expand...

Sweet !!!!! Good Luck :D
 
LarryJewell

LarryJewell

Back with his honey :)
Jan 21, 2007
10,152
0
36
58
San Angelo
Diesel Pilot said:
SBCNX20,

I would love to help out on the tuning side of the equation, I just can't seem to get my hands on an LBZ inlet to do the testing on my own truck. :p

Side note, I talked to my dyno guy last night at a truck pull and he is interested in doing side-by-side dyno pulls with my truck to see the actual power benefit of the LBZ inlet versus the LLY inlet.

Or maybe "someone" would like to send me their intake kit so I could test it. I'd be more than happy to blast the internet with proven dyno numbers and give that "person" mad props for an amazing intake design.;)

Hopefully, my dealer can scratch up an inlet in the next week or so.:dontknow:
Click to expand...


So whats the verdict, have you came up with anything interesting :D
 
othrgrl

othrgrl

Diesel Addiction Owner
Mar 10, 2008
2,151
4
38
Wilmington NC
www.mydieseladdiction.com
With the stock intake box with the fender cut to let air in and the front of the box cut out behind the headlight with the plastic behind the headlight also cut as big as I could. It would bury the 1600* pyro easily and would only give my 36psi of boost out of my 71mm Cheetah. Cruising it was holding at least 675*, usually higher. I ran a best of 12.85 @ 104 pass with this setup but ran a handful of 12.8X runs.

Threw an LBZ inlet elbow and an S&B LBZ intake finally. I ran the same exact tuning and truck setup and saw 50psi of boost but it now holds a steady 47. On the street I would roll into it and watch boost vs EGT - at a steady 40psi it held 1000*; 45psi gave me almost 1200*; cruising it stayed just under 500 to 550* now depending on speed; and in a flat out WOT throttle run it got up to 1400* and then dropped to just over 1300* and held it. I took it to the same track, temperature and humidity was very close to the same, ran the same exact tuning, tire pressure, everything - the only change was the inlet and intake. I ran two back to back 12.53 @ 107 passes on my first runs of the night. I was shocked that an intake and inlet dropped .32 seconds and added 3 mph to my trap speeds.
 
Last edited:
Turbotug

Turbotug

BEER SLAYER
Sep 3, 2006
1,019
1
38
46
Phoenix
Killerbee said:
I'll need your login information to see that. Those people are just too clever for me. Amazing the wealth of knowledge on that forum. Yet everything seems to be a mystery riddle.
Click to expand...

You don't need to be logged in to view that section. ;)

There are a couple threads mentioning your stuff. They seem to get shut down or edited though...
 
You must log in or register to reply here.
Top Bottom