Originally Posted by R_Rated

Would love to hear a review of the drivability. GIAC is not known for smoothness vs factory on high end, complex cars. I have no experience with them on Porsche but can rattle off a handful of other cars where peak hp may have gone up but drivability, idle rpm and smoothness all went downhill and in some cases lost midrange power.

On a 991.2, I'd recommend a boost and AFR gauge of some kind to keep an eye on things if you start playing with the ECU.

if you blow the welds on the intake manifold you'll me hearing this from your SA, "Now, me and the mad scientist got to rip apart the block... and replace the piston rings you fried!"

Best way to do these tunes... live life one quarter mile at a time. For 10 seconds or less you're free.

Originally Posted by mac10

'Would love to hear a review of the drivability'. Drivability is as smooth as stock form-litterally. The only difference is an increased feel of torque and power.

Your basing your knowledge? Please send a review or article that supports your statement "GIAC is not known for smoothness vs factory on high end, complex cars".

And yes please rattle off your list if you would in regards to: "I have no experience with them on Porsche but can rattle off a handful of other cars where peak hp may have gone up but drivability, idle rpm and smoothness all went downhill and in some cases lost midrange power."

The 991.2 already has a boost gauge, from an engineering standpoint(yes I have a degree) 2 pounds of additional boost harming the new 9A2 motor is more than laughable.

"if you blow the welds on the intake manifold you'll me hearing this from your SA, Now, me and the mad scientist got to rip apart the block... and replace the piston rings you fried!"
This may be the most uninformed phrase in your entire post. Do you know how much boost you would need to 'blow the welds' on an intake manifold?

There are two kinds of people on this forum, fact based and opinion based. It sure doesn't take long to figure out who's who.

Originally Posted by mac10

'Would love to hear a review of the drivability'. Drivability is as smooth as stock form-litterally. The only difference is an increased feel of torque and power.

Your basing your knowledge? Please send a review or article that supports your statement "GIAC is not known for smoothness vs factory on high end, complex cars".

And yes please rattle off your list if you would in regards to: "I have no experience with them on Porsche but can rattle off a handful of other cars where peak hp may have gone up but drivability, idle rpm and smoothness all went downhill and in some cases lost midrange power."

The 991.2 already has a boost gauge, from an engineering standpoint(yes I have a degree) 2 pounds of additional boost harming the new 9A2 motor is more than laughable.

"if you blow the welds on the intake manifold you'll me hearing this from your SA, Now, me and the mad scientist got to rip apart the block... and replace the piston rings you fried!"
This may be the most uninformed phrase in your entire post. Do you know how much boost you would need to 'blow the welds' on an intake manifold?

There are two kinds of people on this forum, fact based and opinion based. It sure doesn't take long to figure out who's who.

Originally Posted by R_Rated

He has a boost gauge so in addition to his paper that says engineers know everything...

You can get a lot of power from a couple extra psi however - its not safe or good power since to get those gains you would need:
a.) more boost
b.) not that much boost but undesirable timing, fuel, air, etc.

My 3.8 will make 1000+hp with the right tune... once.

Originally Posted by Valvefloat991

I don't think so, as most non-turbocharged engines have trouble achieving additional power with just a tune.

A mere 2 psi increase in boost, would produce only about a 6 percent increase in airflow through the engine. I suspect that's worth no more than 25-30 hp and lb-ft. Way less of an increase than GIAC is claiming.

Originally Posted by R_Rated

Originally Posted by Drifting

The other thing to consider here is that Porsche spent thousands of hours to carefully calibrate the 991.2 carerra to be as lag-free as possible, and it and the 488 are special because of that extra engineering expense.

If you tune your 991.2, I guarantee that in addition to significant power increases, you'll also introduce significant turbo lag to your car.

Originally Posted by Drifting

Foot feel is more sensitive to lag than a dyno curve. Achieving peak torque at a lower rpm, is not the same as power arriving as soon as you depress the accelerator.

You will increase the lag with a tune, guaranteed. But you'll also get big power. Just a matter of priorities.

I'm very sensitive to lag, which is one of the reasons I drive a NA GT3.

Originally Posted by Valvefloat991

Actually, there is plenty of turbo lag around 2000 rpm. At 3000, there isn't much and if you really don't want to feel any turbo lag, you have to keep the revs above 4000.
.

Originally Posted by randr

Got the telemetry mate, its a non event it really is I could put up a plot of boost relative to throttle % or rpm - its a waste of time as people aren't really interested in facts. The lack of torque below 4000 rpm is very, very noticeable in any of the NA cars. I have both.