What's this thing with the double tune?

I have read a few times to get two tunes .. but don't see how it can be better..

 

with the GMS1 tune, they give you new map sensors and a new operating system. then tune on top of that. thats what it means. the new sensors and OP will allow you to reach high boost ranges and get a better tune. This double tune theory is probably best for those planning on getting a bigger turbo.

 

or haveing the gms1, which is nice, then going to competitive mode and loading an aftermarket tune which is more power and more fun.

 

What is the highest sustained boost pressure using(gms1 + aftermarket tune) that someone has achieved for our factory turbo? What about maximum boost in general with stock engine internals?

 

there are guys doing 27psi. maybe more, but i wouldnt recomend it, will shorten the life of the turbo quite a bit.
anything more wont get u any gain, turbo runs out of breath. Mine holds at 22psi, i might up it to 24, but thats all im going with stock turbo and clutch. gms1 does 22 also i believe.

Guys are doing 400-450 whp on all stock internals if im getting that right. zzp did over 500 but bent the rods. some guys are cracking pistons, but im convinced its a defect in the pistons not that they cant take the hp they are seeing and the tunes being run. People may say otherwise, but its not commen enough and there are people with same tunes with no problems, so thats just my opinion. im at about 315whp 330wtq and i have no problems at all. but i also dont run on tune much and im nice to my car for the most part.

Anyone else have anything to add?

 

I'm running 24 psi on GMS1 only (I will be getting a tune over), I would say 22-24 is a safe boost level. If I remember other posts said that 25 psi is as high as you want on the stock turbo.

Also as Termi always points out (I learned something ), more boost doesn't always mean more power.

 

^QFT I'm running this set up right now... GMS1 as my "stock" tune and Trifecta for my other tune. I bought the GMS1 kit to get the new sensors so that my Trifecta tune could be monitored more precisely... thus allowing me to get more accurate data for Vince to update my Trifecta tune. IIRC I believe Term described the limits of the stock maf sensors in another thread. With the upgraded sensors provided in the GMS1 kit the sensors can correctly read the parameters in a safe manner as opposed to using the "fail-safe" portion of the stock sensors which isn't as reliable nor can it read as high.

 

Makes sense. When sensors get out of their recommended operating range, they become less accurate. Those are some damn expensive sensors, though.

 

Damn right lol... let's see $562 for the kit and $120 for install... neglecting the tune it comes to $341 a sensor in that respect lol. But if that gets me a better tune through Vince it's more than worth it in my opinion... gotta pay to play

 

I think I'll stay on the sideline.

 

Here is some retrospect....

2008 HHR SS with the GMS1 kit.... made 279 and 286 on the dyno...

I tuned on top of that... richened it up to a 12.8, upped the boost about 10%, added some timing, removed torque management... yadda yadda yadda

Made 306whp and 358wtq after my tune....

 

Thats a huge difference! Over 70 wtq from a tune on top of a tune! Good to hear. So I guess we can push the internals to somewhere over 500 hp and be ok. We all know the block is good to well over 800.

 

HP is not the thing I would be worried about with our internals.... is too much heat, and not enough fuel...

Check the blown #1 thread on here...

 

Save that tune

 

it is saved

 

Curiously, how are you having two "tunes" on one ecu? Or do you have one GMS1 ecu and another ecu that has it flashed with GMS1 and then a tun ontop of that?

 

dont think of it as two tunes... the GMS1 replaces the existing OS and as such could be considered a new program for the car. then you aftermarket tune ontop of that.

 

i still think its defectively cast pistons. and or not broken in properly.

 

I can flash a car with the actual gms1 file and the right sensors for less thenhalf the price of just that sensor price, any hptuner could actually. No warranty tho. Gotta pay to play.... Safe lol

And i ran 30psi for over 10k, turbo still feels great. Btf claims it's efficient to ~35psi down lower, need to be around 20-22 above 6k to be safe turbo wise

More boost doesnt always mean more power, in this car it does tho. I have a dyno of my car at 22 & 30 psi... Over 50whp in the midrange Not small potatoes lol.

 

Trifecta offers a dual-tune feature that really is two tunes on one PCM, via use of a proprietary operating system. They are switchable either by the cruise button or by turning ESC on/off.

For instance, you could have the stock tune when ESC is on, and GMS1 when ESC is off.

You could alternatively have GMS1 when cruise is off, and stock while cruise is on. (note that doesnt mean cruise engaged, just enabled via pressing the button).

The only drawback of a Trifecta tune, and this depends on what your needs are, is that you cannot modify the tune yourself. You rely on Vince (owner/proprietor Trifecta Performance) to tune your vehicle via datalogging and sending logs/tunes back and forth. Essentially the same way you would if you were to be remotely tuned by someone with HP Tuners.

Some people say Trifecta tunes aren't as powerful as HP Tuners tunes, but that really depends on the tuner, and the fact that Trifecta is somewhat of a performance oriented OEM. They won't take your car to the bleeding edge of safety unless you specifically request it.

All of that said, go with whatever tuning solution you feel most comfortable with. In the end it's your car. I just felt the need to clarify the meaning of "dual tune".

 

Yeah safety imo is worth the money. My other motive was, if for any reason I wanted to, I could flash my ecu back to GMS1 through my EZflash cable. Doubt I'll ever have to, but it's nice to have options

 

Thats awsome Matt!!

So if im reading right, u can use the normal GMS1 tune for everyday driving(which i have) and then tune over it only in "Competition mode" so i can have more HP and TQ in comp mode only?? that would be awsome!! Might have you do that Matt when it comes time.

Garrett

 

I'm not sure how an HP Tuner tune would be compared to a Trifecta tune, but in my case I have both the GMS1 and my Trifecta tune and I actually get better city and highway gas mileage with my Trifecta. You might not even use your GMS1 tune anymore haha

 

I just wanna make sure that I understand this correctly ..

Can you get the trifecta tune on in comp mode, still keeping the rest of the specs (Traction control, adapted ESC, Launch control) ?

 

No, he's saying he can modify the GMS1 tune further.