Topic: 255 Kpa limit... is it gone?

[TempeRacerGuy]

Hello all,

I've been holding off on a tune for my car for one reason... the 255kpa limit.   I have heard rumors that it's no longer a limit and that the code has been broken, but I have not seen anything that confirms this is true.

So, simple question... Has it been broken?


Now, let's add some fine tuning questions here.

Has Lyndon (or anyone else)  developed a tune for the GMPP sensors (without the GMPP tune)
Have any other cool features been developed within the code?  (for example, my Evo tune has Launch control, No-lift shift, Valet mode incorporated (all through the tune alone)

My goal is to do a turbo kit... but to get the drivability and turbo response I want, I will have to excede the 23psi limit.

Thank you much

[shabby]

Nothing has been broken yet, hptuners is working on the overboost and higher kpa code but i haven't seen any updates from them.

[snaponbob]

Per Lyndon Friday, he is elbow deep in race cars and engine swaps. SO far he took a swing at HIS GXP with some tweaks of the GMPP tune and parts with a BUNCH of boost and the dreaded knock to the point of being audible. So far he has not had his car back on his dyno. And we wait. He shared some suspicions as to what is MIGHT be which lead me to ask if anyone has come up with a solution for more fuel volume and bigger injectors. It was an "aHA" moment and I thought I heard him mumble "I wish".

[lil goat]

Lyndon has learned some stuff from the GMPP, he is porting this over to the stock tune and I am testing it, in a word DAAHAM! He is just slammed this time of year as race season is just beginning in the Polar North eh. You have two choices, be patient or get what he has now, upgrades are free he does have a test tune out for the GMPP upgrade with the sensors, so if you installed the sensors yes he he can sell you a tune to work with them sans you buying the whole GMPP kit, he did and runs it on his DD.

[AdamVIP]

It was posted on the other forum awhile back by Dejon Dave that while you cant do it electronically you can increase to 28 psi using a manual boost controller with the GMPP tune without throwing a code.  I dont think Ive seen anything further on it other than you can do it.  It would be nice to confirm this but its kinda pointless without doing a turbo swap first.  The stocker cant handle 28 psi

[jonymac]

Can Lyndon (or anyone for that matter) get just the sensors for us? Do you have to be a dealer to get them?  Can you order just the part numbers for the sensors from the dealer?

[Filipp]

Someone looked into it earlier and the Sensor's actually come straight from Germany and I believe theres no other way to get them except buying the kit.

[lil goat]

The sensors at this time are very hard to get, that may change, law of supply and demand. It was about $300 for just the sensors anyway, then you have to get the connections sooo... the answer is no they are not easily available at this time.

[DirtyMike]

Aftermarket bosch style sensors?

[TempeRacerGuy]

Lyndon has learned some stuff from the GMPP, he is porting this over to the stock tune and I am testing it. 

Has he learned how to duplicate the no-lift-shift feature of the GMPP tune?  I have this on my Evo, and it's amazing to use at the track.  It's truely a great performance modification

You have two choices, be patient or get what he has now, upgrades are free he does have a test tune out for the GMPP upgrade with the sensors, so if you installed the sensors yes he he can sell you a tune to work with them sans you buying the whole GMPP kit, he did and runs it on his DD.

Well, the sensors alone are worthless if the 23kpa limit is still there.  However once the 23kpa limit is gone, then it totally makes sense to do it.

but its kinda pointless without doing a turbo swap first.  The stocker cant handle 28 psi

This is all the design phase of my build up.  I want a highly efficient/responsive turbocharger that the stocker is not.  I believe that the GT2860RS's or one of the GT2871R's  is the right turbo for me.  This will give me the efficiency and the responsiveness that I need for my type of driving, but unfortunately will not give me the flow that I need for my peak HP goal below 23psi.

So, the 255kpa limit is the wrench that's in my cogs.

[Dave@DDMworks]

The sensors at this time are very hard to get, that may change, law of supply and demand. It was about $300 for just the sensors anyway, then you have to get the connections sooo... the answer is no they are not easily available at this time.

We checked around and found a place that we can order them the bosch sensors tomorrow without a problem, but really until the 255kpa limit is broken, they really do not do much over the stock sensors. The other thing is that the poor little stock turbo is pretty far out of its efficiency range based on the compressor maps we have seen. When you are pushing 23psi and moving enough air to make 300 at the wheels just raising the boost is not going to net you to much more horsepower, although being able to bump up the pressure in the midrange, where the stock turbo still has some efficiency left would be really fun. Or if you are doing a turbo swap and have a turbo that can push a little more air at higher pressures it would be a good thing also.

[LatinVenom]

Well you did my Larger wheel turbo tune, and it flows 43 lbs I believe vs the 36 lbs or 34 lbs from the stock turbo.
I know with my car, your tune and the larger wheel it does not take much to be at 23 lbs and I presume if the 255kpa limit were broken it would very easily handle 26 psi maybe more.
Your expert comments are welcome since you tune not only  mine but BLACKSKY who also has the larger wheel turbo.
PS:
You also help DirtyMike with the problem with the Large turbo wheel issue.

[DirtyMike]

Stupid limit

[jonymac]

Yeah Dave - as we discussed before - the turbo wheel upgrade is my "final" performance mod - just need to figure out the funds and timing for it - would be nice to time it for the 255 limit break...

[lil goat]

This is the busy season for Lyndon, he builds a lot of race engines over the winter and installs them about now for the very short Alberta summer. He just has to find some time. He says there is a lot left on the table with the stock turbo, and he is having a hard time getting it to do what he wants, just sort of mumbled about the cam timing on this little engine being hard to figure out. Knowing a bit about how he does things, I know he wants to optimize the engine as if it didn't have a turbo, then throw the boost on it.

[snaponbob]

This is the busy season for Lyndon, he builds a lot of race engines over the winter and installs them about now for the very short Alberta summer. He just has to find some time. He says there is a lot left on the table with the stock turbo, and he is having a hard time getting it to do what he wants, just sort of mumbled about the cam timing on this little engine being hard to figure out. Knowing a bit about how he does things, I know he wants to optimize the engine as if it didn't have a turbo, then throw the boost on it.

I want to send you a copy of an e-mail I just received from Lyndon. How can I do that? I don't see a method of sending a PM.

Oops, figured it out. PM sent.

[lil goat]

Thanks for the info SOB, we have some very exciting developments a foot, a couple of folks got to talking last night.

[spicy3480]

From what I understand, Lyndon tries to optimize engine performance before he increases the boost.  The stock turbo can only handle so much...if you have ever looked at it, you will see that it is really small.  I will tell you this, I have the MACH II kit from DDMWorks installed on the car and Lyndon has sent me an updated tune to test on it.  It is very, very fast and super smooth!  If you are not racing at the track and are working on a smaller budget, you can do wonders with the little stock turbo with the right modifications and tuning.  As I further test this tune and let it learn in, I will try and get the car on the dyno.  I have an automatic, so that's good news for the auto guys and gals.  Depending on what Lyndon can do with the GMPP sensors, I might consider trying to upgrade to them along with the MACH II kit.  I would think that this kind of setup would be almost at optimalization for the stock turbo.