Big Blue24
Comp Diesel Sponsor
- Joined
- Jan 5, 2008
- Messages
- 6,320
Update: Dyno Time
I finally found some time to put the Junker on the dyno and tune it. I got carried away with the timing at 38* and ejected the headgasket on the first full power pull. That was back in January.
After a new .010" over gasket a little taller oring wire in the block to bring protrusion up over .011".
I also installed Power Driven's newly released "Turbo Tuner" which is an internal wastegate controller that can be mounted in the cab for easy wastegate tuning changes on the fly. It does not have external bleed and associated noises/hiss under load like traditional wastegate controllers. It works like an inverse regulator in that it stops 100% of the boost signal until the knob adjusted pressure setting is achieved, then it allows boost through the controller at a 1:1 ratio. This is great for eliminating wastegate creep/early cracking and slower spool time because the wastegate is no longer affected by the boost signal until the controller allows boost to hit the actuator.
For example, if the controller is set to 25 psi and 15 psi of boost is present in the system, 0 psi goes to the wastegate. At the same 25 psi setting, if 30 psi is present, it allows just 5 psi through to the actuator. So far, every truck/tuning application that we've tuned with the turbo tuner has had excellent results.
I used to run a home-brew oil mixture consisting of off the shelf 15w-40 loaded with zinc additive to keep my steel cam/non-bushed block happy. Now that Power Driven Diesel has released their new 15w-40 conventional and synthetic engine oils that are boosted with ZDDP to over 2000 PPM, I fill the Junker with a 50/50 mixture of the conventional and synthetic.
After a second retorque to 140 ft-lbs on the Extreme Studs, we loaded it up on the MD-1750 dyno and beat on it late Friday night for a long tuning session. The best pull was 806 HP uncorrected and the vast majority of the dyno runs ended with peak power in the 750 to 790 HP range.
The following morning, Saturday, was a drag racing event down in St. George, UT at the old airstrip. Track prep past 100' out was non-existent and I struggled for traction until overdrive despite the big 33x14.50 slicks. I made my best pass detuning the truck to about 750 HP and then hitting the full power mode switch on the AFC LIVE race box after shifting into overdrive where all the power could be applied to the track. This resulted in a sluggish 11.23 @ 129.8 MPH. The slow ET is nothing to brag about or the poor 1.9 60' time, but the trap speed shows an average horsepower of 800 HP to the tires. This shows that our Mustang dyno is pretty tight as far as peak power numbers but very close to the average HP put down on the track.
The Northwest Dyno Circuit was also on-site with Custom Auto's mobile Superflow Dyno. So, being the curious sort, I paid $75 to run the Junker.
I took a screen shot of the dyno's correction factor and weather station data just after Baca's 1917HP run and just prior to my run:
The Junker made a loud clank/metallic noise just after putting the petal to the floor as boost was coming up, and coolant almost immediately started spewing. Upon further investigation, it appears that a head stud broke mid-pull. I don't yet know if this hurt power or not, but the "corrected" HP number still didn't disappoint.
To make a full comparison of PDD's Mustang vs Custom Auto's Superflow will take many more comparison pulls with several trucks, but on this day, the uncorrected numbers were very close on both dynos and the actual average HP on the track was close to the peak uncorrected numbers although I'd like to think a broken head stud had to have hurt the power number on the Superflow...
In dyno testing, we've found that the Junker is finally out of air as boost drops from 75 psi in the mid 2500 to 2800 rpm range down to just 62 psi by 3500 rpm regardless of wastegate settings. A bigger compound turbo setup is in the works because I will never be able to compete at the track with just 800ish err 920ish "corrected" HP!
I finally found some time to put the Junker on the dyno and tune it. I got carried away with the timing at 38* and ejected the headgasket on the first full power pull. That was back in January.
After a new .010" over gasket a little taller oring wire in the block to bring protrusion up over .011".
I also installed Power Driven's newly released "Turbo Tuner" which is an internal wastegate controller that can be mounted in the cab for easy wastegate tuning changes on the fly. It does not have external bleed and associated noises/hiss under load like traditional wastegate controllers. It works like an inverse regulator in that it stops 100% of the boost signal until the knob adjusted pressure setting is achieved, then it allows boost through the controller at a 1:1 ratio. This is great for eliminating wastegate creep/early cracking and slower spool time because the wastegate is no longer affected by the boost signal until the controller allows boost to hit the actuator.
For example, if the controller is set to 25 psi and 15 psi of boost is present in the system, 0 psi goes to the wastegate. At the same 25 psi setting, if 30 psi is present, it allows just 5 psi through to the actuator. So far, every truck/tuning application that we've tuned with the turbo tuner has had excellent results.
I used to run a home-brew oil mixture consisting of off the shelf 15w-40 loaded with zinc additive to keep my steel cam/non-bushed block happy. Now that Power Driven Diesel has released their new 15w-40 conventional and synthetic engine oils that are boosted with ZDDP to over 2000 PPM, I fill the Junker with a 50/50 mixture of the conventional and synthetic.
After a second retorque to 140 ft-lbs on the Extreme Studs, we loaded it up on the MD-1750 dyno and beat on it late Friday night for a long tuning session. The best pull was 806 HP uncorrected and the vast majority of the dyno runs ended with peak power in the 750 to 790 HP range.
The following morning, Saturday, was a drag racing event down in St. George, UT at the old airstrip. Track prep past 100' out was non-existent and I struggled for traction until overdrive despite the big 33x14.50 slicks. I made my best pass detuning the truck to about 750 HP and then hitting the full power mode switch on the AFC LIVE race box after shifting into overdrive where all the power could be applied to the track. This resulted in a sluggish 11.23 @ 129.8 MPH. The slow ET is nothing to brag about or the poor 1.9 60' time, but the trap speed shows an average horsepower of 800 HP to the tires. This shows that our Mustang dyno is pretty tight as far as peak power numbers but very close to the average HP put down on the track.
The Northwest Dyno Circuit was also on-site with Custom Auto's mobile Superflow Dyno. So, being the curious sort, I paid $75 to run the Junker.
I took a screen shot of the dyno's correction factor and weather station data just after Baca's 1917HP run and just prior to my run:
The Junker made a loud clank/metallic noise just after putting the petal to the floor as boost was coming up, and coolant almost immediately started spewing. Upon further investigation, it appears that a head stud broke mid-pull. I don't yet know if this hurt power or not, but the "corrected" HP number still didn't disappoint.
To make a full comparison of PDD's Mustang vs Custom Auto's Superflow will take many more comparison pulls with several trucks, but on this day, the uncorrected numbers were very close on both dynos and the actual average HP on the track was close to the peak uncorrected numbers although I'd like to think a broken head stud had to have hurt the power number on the Superflow...
In dyno testing, we've found that the Junker is finally out of air as boost drops from 75 psi in the mid 2500 to 2800 rpm range down to just 62 psi by 3500 rpm regardless of wastegate settings. A bigger compound turbo setup is in the works because I will never be able to compete at the track with just 800ish err 920ish "corrected" HP!
Last edited:
I may have to do this. I always just tell myself it is in my head LOL
