What is a backend flash?

[MuNkY6913]

Originally Posted by No Style 135is

Can I call Dinan Stage 3 as a back end flash as well?
If I stack a JB4 on top of Dinan, I can call my car run a JB4 with BEF, am I right?

I would say most would call that jb4 stacked with dinan. but if you really wanted to say that you could.

[ShocknAwe]

Originally Posted by No Style 135is

Can I call Dinan Stage 3 as a back end flash as well?
If I stack a JB4 on top of Dinan, I can call my car run a JB4 with BEF, am I right?

No. Backend flash has zeroed out boost targets, with many other changes to timing, fueling, waste gate performance, specifically adjusted to jb4 controlled power outputs at a given octane level.

Nothing inherently wrong with stacking the JB4 on top of your Dinanflash, but a burger motorsports backend flash is designed to do that.

[feuer]

Originally Posted by ShocknAwe

No. Backend flash has zeroed out boost targets, with many other changes to timing, fueling, waste gate performance, specifically adjusted to jb4 controlled power outputs at a given octane level.

Nothing inherently wrong with stacking the JB4 on top of your Dinanflash, but a burger motorsports backend flash is designed to do that.

What happens with BEF when JB4 is in Map0 ?

[ShocknAwe]

Originally Posted by feuer

What happens with BEF when JB4 is in Map0 ?

Zero boost.

[DaZuc]

Originally Posted by feuer

What happens with BEF when JB4 is in Map0 ?

I use JB4 BEF, when in map 0 car is just as fast as map 1 no BEF.

[ShocknAwe]

Originally Posted by DaZuc

I use JB4 BEF, when in map 0 car is just as fast as map 1 no BEF.

Shouldn't be...

[DaZuc]

Originally Posted by ShocknAwe

Shouldn't be...

Only thing I can think of is because I flashed via MHD?

I've flash a couple of friends cars with the same setup, exact same result.
Map 0 (BEF) > Map 1 (No BEF).


What your saying "0 boost" makes no sense, map 0 just disables/bypasses JB4.

[No Style 135is]

one thing I know now is MHD is working on N55 engine for BEF.

[ShocknAwe]

Originally Posted by No Style 135is

one thing I know now is MHD is working on N55 engine for BEF.

Theyre working on it for standalone flash purposes. No point in backend flashing a N55.

[bNks334]

Originally Posted by DaZuc

Only thing I can think of is because I flashed via MHD?

I've flash a couple of friends cars with the same setup, exact same result.
Map 0 (BEF) > Map 1 (No BEF).

What your saying "0 boost" makes no sense, map 0 just disables/bypasses JB4.

The JB4 stacks on top of the tune, not the other way around. Hence the name "piggyback" tuner.

What he is saying makes perfect sense. A "BEF" is a flash tune like any other. Dinan, PPK, PTF, and Cobb are all flash tunes. They all do the same thing but they use different, custom, tables.

A BEF is just specifically tuned to work with the boost that the JB4 calls for. I guess some tuners set their "BEF" tunes to 0 "boost" which would mean the JB4 always controls your boost. Therefore, when you set the JB4 to map 0, and bypass its boost control, you are left with 0 boost since that is what the BEF flashed your DME boost table to.

If your car has a "BEF" and is still producing boost with the JB4 set to map 0, that means the tuner did not 0 out the boost table. All that means is that they gave you some sort of base boost, which is going to be a value less than JB4 map1. If you ever removed the JB4, your car will still be tuned to boost to whatever they set it to. Most likely they kept the flash at the stock boost values (8psi for N55), or matched the JB4 map 1 values.

The JB4 works like this: DME signals 0 boost, JB4 intercepts it, JB4 passes along it's own programmed boost value, such as 13psi. That's the concept of it anyway. To reiterate, the JB4 is only taking over boost control when it is targeting greater boost values than the DME. If you BEF, or even the ppk, called for 17 psi, and you had the JB4 in map 1, the JB4 would do nothing since it only calls for 13psi...

[darrell135]

Originally Posted by bNks334

The JB4 stacks on top of the tune, not the other way around. Hence the name "piggyback" tuner.

What he is saying makes perfect sense. A "BEF" is a flash tune like any other. Dinan, PPK, PTF, and Cobb are all flash tunes. They all do the same thing but they use different, custom, tables.

A BEF is just specifically tuned to work with the boost that the JB4 calls for. I guess some tuners set their "BEF" tunes to 0 "boost" which would mean the JB4 always controls your boost. Therefore, when you set the JB4 to map 0, and bypass its boost control, you are left with 0 boost since that is what the BEF flashed your DME boost table to.

If your car has a "BEF" and is still producing boost with the JB4 set to map 0, that means the tuner did not 0 out the boost table. All that means is that they gave you some sort of base boost, which is going to be a value less than JB4 map1. If you ever removed the JB4, your car will still be tuned to boost to whatever they set it to. Most likely they kept the flash at the stock boost values (8psi for N55), or matched the JB4 map 1 values.

The JB4 works like this: DME signals 0 boost, JB4 intercepts it, JB4 passes along it's own programmed boost value, such as 13psi. That's the concept of it anyway. To reiterate, the JB4 is only taking over boost control when it is targeting greater boost values than the DME. If you BEF, or even the ppk, called for 17 psi, and you had the JB4 in map 1, the JB4 would do nothing since it only calls for 13psi...

So essentially having a BEF makes running safer boost with jb4, fbo, & e85?

[bNks334]

Originally Posted by darrell135

So essentially having a BEF makes running safer boost with jb4, fbo, & e85?

Yes, the BEF helps adjust AFR, timing, and fuel scalars that the JB4 alone can't fully control.