Burger JB4 vs AFE Scorcher - Piggy Back Tuners

[L-GX550-P]

Oh yea, the difference is very noticeable. I've had a station here that had exactly e50 in their tanks for over a month. It's legal to sell as low as E50 as E85. That worked out great until I had a full tank of E85 that I had to keep diluting and stay out of boost.

 

[L-GX550-P]

Update:

Finally got the tune installed and working. First impression is a noticeable different in Sport mode. Sport+ feels perfectly balanced with boost coming on early and makes overtaking much more confident. Race mode ... OMG ... The boost comes on very early and the truck takes off like a plane on a runway. You can still use it to drive around normally but I felt the boost coming on too quickly for normal daily driving.

 

[GXXR]

I would love to see a stock tune run vs. these other tunes run on a Dragy for 0-60 and 1/4 mile differences.

 

[L-GX550-P]

I would love to see a stock tune run vs. these other tunes run on a Dragy for 0-60 and 1/4 mile differences.

That's a really good idea. I was going to use the built in 0-60 time that the bluetooth has. I do have a draggy somewhere as well. I can do both and compare each mode. Just need to find a nice level road to be consistent on and make sure there is enough cooling time in between pulls to avoid heat soak.

 

[GXXR]

I think that would be some excellent data, with the stock baseline established on the same GX550 that will get a tune on it, by someone capable and knowledgeable about performance cars.

I was wondering how these fuel systems hold up to E50 or higher levels.

I have E85 cheap and handy nearby, and I know how awesome it is for great and safe power.

The limit may not be the ring lands or a head gasket, but the transmission’s ability to hang on through an extra 100+ft lbs of torque while heaving a 5500lb rig forward. A fast and somewhat lighter car is much easier on drivetrain and transmissions.


Also, has anyone established what the stock converter flashes at?

I want a Dragy, but my wife knows what they do, and she doesn’t want me getting busted while performing a test on an “approved” local surface….

 

[L-GX550-P]

I noticed the gas tank allows up to E20. Most cars I've seen say up to E10 and the pumps in my area say may contain up to 10% ethanol.

 

[GXXR]

Hmmm, interesting on the up to E20.

I wonder if there is an ethanol content sensor in the stock fuel system and secondarily, a way to tap into it to see what the current fuel is at the time.

There are multiple E85 pumps near me, so I could do some figuring and add in a few gallons at the top of the tank for some additional detonation resistance. Also, I know that E85 can vary wildly from around E50 to E90, depending on the mix at the time of year.

Does anyone know what the stock injector size is?

 

[L-GX550-P]

I have a E85 tester that I used to use. We could try to blend to E20 and see how it performs ... I don't think there would be a factory ethanol sensor since the car does not have factory flex fuel tuning.

 

[GXXR]

I was wondering the same, but, I guess the fuel trims could make up for that much variance in fuel BTU/specific gravity of higher ethanol fuel based on lambda logic.

It just takes more fuel volume sprayed/used to get to lambda with the E20 than the E10.

I would like to see the factory targeted lambda value at the factory boost pressure and timing tables and see how these tunes are massaging the numbers. If it is pig-rich at WOT, there could be a lot of room and still be safe. It would also be good to see what the LPH rating is on the factory fuel pump.

 

[L-GX550-P]

Exactly, need to find out the limitation on the fuel pump. Either the pump or injectors may be why we can safely run E20. But where in the country offers E20 directly from the pump?

 

[L-GX550-P]

Hey everyone, here is the quick video I made for the afe power module install.