[dberry08]

Anyone know how accurate the HP and Torque display is for the f30 335i? I could punch it and get close to the 320hp previously, so after adding a JB+ which claims to add 30 hp, I figured I'd see an increase on the gauge. So far I'm not seeing any changes. I would have expected to see the gauge max out since the additional HP should push it beyond the 320. Thoughts?

[jgoens]

Hard to say...with my jb4, dp and e30 mine maxes out at 80% throttle.

[HFW003]

They are a gimmick!

[otay]

Originally Posted by HFW003

They are a gimmick!

+1

[BEAR-AvHistory]

No relationship to reality.

[Poon Stick]

You car doesn't actually have a dyno built into it.

The sports guages don't mean anything, they're just a computerized estimate based on throttle position and engine load

[ELiTeNeSs]

Originally Posted by Poon Stick

You car doesn't actually have a dyno built into it.

The sports guages don't mean anything, they're just a computerized estimate based on throttle position and engine load

This. I wish there was a way to code it to show 400hp lol

[dberry08]

Thanks for the input. Not really feeling a SOTP difference with the JB+ yet...maybe it needs a few more cycles still.

[BEAR-AvHistory]

Originally Posted by dberry08

Thanks for the input. Not really feeling a SOTP difference with the JB+ yet...maybe it needs a few more cycles still.

Don't know if this will work with the + but it used to when I was testing the JB4 software for the 335is.

Make 3 WOT runs from 2500RPM through the shift into 4th gear back to back. That used to be enough to reset the JB4 into the cars max performance level.

[M2_MEDUSA]

Originally Posted by dberry08

Anyone know how accurate the HP and Torque display is for the f30 335i? I could punch it and get close to the 320hp previously, so after adding a JB+ which claims to add 30 hp, I figured I'd see an increase on the gauge. So far I'm not seeing any changes. I would have expected to see the gauge max out since the additional HP should push it beyond the 320. Thoughts?

Your not getting 30hp. To the wheels your only gaining 12-15

[BEAR-AvHistory]

Originally Posted by IssaF32

Your not getting 30hp. To the wheels your only gaining 12-15

How do you know this?

[dberry08]

Originally Posted by IssaF32

Your not getting 30hp. To the wheels your only gaining 12-15

Right, and lets assume the display isn't accurate. Even so, I thought the gauge would play along with the increased boost and go higher than before. I'll give the cycle a shot.

[Wires]

Gauge isn't seeing any "increased boost". Every piggyback spoofs the DME that the boost pressure is lower than expected, so it cranks it up more to hit the expected target.

The sport display is 100% fluff, and means absolutely nothing.

[M2_MEDUSA]

I'm pretty sure the sport display will only reflect your mods if you have your ECU flashed

[harperium]

The Sport Display isn't just throttle position + RPM. It is also vehicle speed.

If I sit in Park, and rev the engine, the RPM goes up, the HP hovers around 10 or 15.

So for 3 variables (RPM, throttle and speed), it's actually a fairly dynamic "gimmick." Given that HP is work per unit time, the fact that it seems to include speed means it's actually a crude dyno. Right?

[torkles]

Originally Posted by harperium

The Sport Display isn't just throttle position + RPM. It is also vehicle speed.

If I sit in Park, and rev the engine, the RPM goes up, the HP hovers around 10 or 15.

So for 3 variables (RPM, throttle and speed), it's actually a fairly dynamic "gimmick." Given that HP is work per unit time, the fact that it seems to include speed means it's actually a crude dyno. Right?

it's not vehicle speed, it's engine load. when you rev it in neutral there's no load on the engine. the engine doesn't need to generate 300hp to rev.

[harperium]

ok... but then the question is, how accurate is the Sport Display?

Some would say it's just a simple table lookup: RPM * throttle = value for the screen. But if it is taking into account actual engine load, that would mean it is more dynamic than a simple table lookup.

[Poon Stick]

It can measure the amount of fuel going into the engine. In a perfect world it could give you actual numbers.

Assuming A/F ratio is correct (use O2 sensors in exhaust) then you can calculate exact power just by how much gasoline is used. Piggybacks also mess with how much fuel is injected w/ boost.

It's also how your MPG or L/100km gauge works.

We don't live in a perfect world so the gauge's don't really mean much. It's a toy. Believe it as is if you like or you can use it as a relative gauge based on what your car CAN output. in your mind convert 300 (or whatever number is your max) to 100% and work from there

[torkles]

Originally Posted by harperium

ok... but then the question is, how accurate is the Sport Display?

Some would say it's just a simple table lookup: RPM * throttle = value for the screen. But if it is taking into account actual engine load, that would mean it is more dynamic than a simple table lookup.

some people say that cucumbers taste better pickled

[harperium]

Originally Posted by torkles

some people say that cucumbers taste better pickled

sometimes a cucumber is just a cucumber