[musc]

Hey guys. Just thought I'd share this over on this forum. MHD is working on a load by gear by RPM feature where we can control load (and thereby controlling boost) for each gear individually and for different RPM setpoints within that gear. This should allow some boost reduction for those struggling with 1st gear street launches and even second gear issues. This is still in testing but hopefully will be available soon.

I have a 335is running INA0S_IS with DCT trans. I set my load in first ranging from 110-120 and 2nd limited to 140-150. 3rd and beyond was my normal loads which are 190-215 range. One thing I didn't account for was my overboost tables which are low values of no more than 10, but added 8-10 points to the total load. I did 3 logs. Middle log is the best and includes 1st gear. Didn't go from a dead stop but it's enough to prove this WORKS. Will need to play around with load to get things dialed in where i need them for desired boost.

Anyone that still thinks Cobb is just as good or wants to keep a Cobb, it's developments like this that make it a no brainer to move to MHD. Without these new features the Cobb is all but obsolete.

http://datazap.me/u/notmynormaldataz...data=2-4-14-23

[Jklad]

This really is pretty cool....but if your not getting traction in 1st or 2nd, why not just learn the correct point at which part-throttle it until it hooks?? Maybe I'm old-school, but there was a skill to launching correctly and hooking the tires, then knowing how to adjust throttle accordingly in 1st and 2nd....using a linear throttle mapping, of course!

[musc]

Originally Posted by Jklad

This really is pretty cool....but if your not getting traction in 1st or 2nd, why not just learn the correct point at which part-throttle it until it hooks?? Maybe I'm old-school, but there was a skill to launching correctly and hooking the tires, then knowing how to adjust throttle accordingly in 1st and 2nd....using a linear throttle mapping, of course!

Well that is one option but a lot easier said than done. That's how I grew up racing NA/nitrous cars. With these cars, certain situations such as launching with a DCT trans require that DTC be enabled so at the hint of wheel spin, DSC kicks in and kills power. Feathering the throttle in situations such as that can be impossible. Reduced boost can enable an easier launch in these situations.

[stari335]

Sounds like this only applies to DCT cars?

[Sered]

Originally Posted by Jklad

This really is pretty cool....but if your not getting traction in 1st or 2nd, why not just learn the correct point at which part-throttle it until it hooks?? Maybe I'm old-school, but there was a skill to launching correctly and hooking the tires, then knowing how to adjust throttle accordingly in 1st and 2nd....using a linear throttle mapping, of course!

Because turbos have a non-linear response to pedal input based on many factors.

[135Pats]

Originally Posted by Jklad

This really is pretty cool....but if your not getting traction in 1st or 2nd, why not just learn the correct point at which part-throttle it until it hooks?? Maybe I'm old-school, but there was a skill to launching correctly and hooking the tires, then knowing how to adjust throttle accordingly in 1st and 2nd....using a linear throttle mapping, of course!

Easier said than done when you don't spool until 3.5K. Boost comes on suddenly with a larger turbo and that can be tough to manage.

Originally Posted by musc

Well that is one option but a lot easier said than done. That's how I grew up racing NA/nitrous cars. With these cars, certain situations such as launching with a DCT trans require that DTC be enabled so at the hint of wheel spin, DSC kicks in and kills power. Feathering the throttle in situations such as that can be impossible. Reduced boost can enable an easier launch in these situations.

The DCTs are such a pain to launch...I feel for you. Friend of mine (and he can drive) stalled his out at the strip a month ago; it bogs like mad if you don't get it perfect. Next run he dropped a half shaft.

Originally Posted by Sered

Because turbos have a non-linear response to pedal input based on many factors.

This!

[Jklad]

Wow, I wasn't aware - I'll have to drive a DCT at some point to experience what it's like.

[bradsm87]

Originally Posted by Jklad

This really is pretty cool....but if your not getting traction in 1st or 2nd, why not just learn the correct point at which part-throttle it until it hooks??

You can map load according to RPM in each gear. You'd have to be super-human to modulate the throttle to be right on the edge of traction at all RPM in 1st. With this feature, you can map load inversely to the torque output of the engine to put out perfectly flat real torque, right across the RPM range. I've tried many methods of launching and I've never launched as fast as my first test run last night using load per gear.

[MHD Tuning]

Originally Posted by stari335

Sounds like this only applies to DCT cars?

No no, it will be available for all trans / all cars.