99 L29 454 build

[Supercharged111]

I see WOT, ~3100 RPM, and only 22 degrees of advance. I also see you're commanding 12:1 AFR and you have no knock activity. I'd be adding in some more timing myself, start to creep up on trace knock.

I also see a mere 89kpa at WOT. What elevation are you at?

 

[Scottm]

Thanks Super! I have been sure the timing was low. It's costing gas milage, but also putting a lot more heat into the exhaust system than it should be.

That was about 2,000 feet elev. Perhaps the engine wants more airflow than the tb and maf can supply.

I sent it back to BB and asked for more timing at cruise, but clearly it needs more wot timing too. It should be 34 deg by 3,000. Is that easy to play with in HP tuners? I need to just buy it.

 

[Scottm]

It's confirmed, I am a moron. I just realized I can open the data log on the efi live scan tool app and see the numbers myself. That same run has a peak airflow of 25 lb/minute. At 12:1 afr, thats about 2 pounds of fuel per minute, so a gallon would last a little over 3 minutes. At 60 mph it would go 3 miles in 3 minutes for 3 miles per gallon! Another way to look at it is 2 pounds per minute is 120 lb/hr. Divide that by 8 gives 15 lb/hr per injector, which confirms the 36 lb/hr injectors were running at 40% duty cycle. This is fun!

 

[Supercharged111]

Thanks Super! I have been sure the timing was low. It's costing gas milage, but also putting a lot more heat into the exhaust system than it should be.

That was about 2,000 feet elev. Perhaps the engine wants more airflow than the tb and maf can supply.

I sent it back to BB and asked for more timing at cruise, but clearly it needs more wot timing too. It should be 34 deg by 3,000. Is that easy to play with in HP tuners? I need to just buy it.

I'll better be able to see what a 454 wants when I tune the plow truck. The dually doesn't want much timing with the boost and IATs it sees and I don't recall off hand how much timing the dually wanted NA. What fuel are you running?

 

[Supercharged111]

It's confirmed, I am a moron. I just realized I can open the data log on the efi live scan tool app and see the numbers myself. That same run has a peak airflow of 25 lb/minute. At 12:1 afr, thats about 2 pounds of fuel per minute, so a gallon would last a little over 3 minutes. At 60 mph it would go 3 miles in 3 minutes for 3 miles per gallon! Another way to look at it is 2 pounds per minute is 120 lb/hr. Divide that by 8 gives 15 lb/hr per injector, which confirms the 36 lb/hr injectors were running at 40% duty cycle. This is fun!

Check and see what your duty cycle does up around 5000.

 

[Scottm]

Running just 87 oct regular.

 

[Scottm]

There is a parameter of rw hp. How does it figure 626 rwhp at 3,200? That would take probably 20 lb of boost.

 

[Supercharged111]

There is a parameter of rw hp. How does it figure 626 rwhp at 3,200? That would take probably 20 lb of boost.

Right click it, it's rate of change of speed over time. Super dumb. I made a PID in V8 that does calculated HP based on RPM, calculated torque, and

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[Scottm]

I will have to send the data cable back to BB. I have already downloaded the EFI live scan app and tuning app. What do I need to buy to be able to tune with efi live?

 

[Supercharged111]

Flashscan V3 and GM tuning option.

FlashScan V3

FlashScan V3 Scan Only is a scan tool, data logger and calibration reader for selected GM, Dodge Cummins and Cummins HD engine controllers. Add Tuning Options to FlashScan V3 to include calibration flashing to suit your application. Each Tuning Option ships with 2 VIN Licenses to tune two...

www.efilive.com

They've changed a little since I got my V2 eons ago, but the cost isn't that much more. I got mine on a group buy. If I had a V3 I could add Cummins tuning for $450 instead of having to buy a new piece of hardware. I like that. My V2 predates them screwing with Cummins.