I would like to "remap" my car. Seems like increased boost is always part of the equation. I guess for turbo cars this is mostly the way the hp is increased if you are just "chipping" your car ie no intake or exhaust mods first.
Brings me to my question... what is a max safe boost increase, ie NO long term effects on engine that you are planning on keeping for a long time without having to open it up?? Should boost stay at or below 1 bar?
Is there a linear equation for a stock car, ie X amount of boost = Y amount of hp increase?

thanks in advance for all your turbo expert opinions!!

tom

 

excellent question!!

I for one am very interested as it would seem to explain the cost differential between the domestic chip 'n go tuner, and the german upgrades wherein boost seems to stay lower and a cam, turbo and i/h/e, seem to be customary.

Anybody here been pushing 1.4bar for >50k miles??

 

What's the max boost if the goal is NO long term effects on the engine? That would be 0.6 to .07 bar for the K16's (read "stock boost"...).

What's the max "reasonable" boost for normal use of a Turbo with K16's? Probably 1.2 bar.

 

Throttle body slams shut and car goes into limp mode at 1.3bars

 

don't want to overboost and overspin the k16's beyond their compressor's efficiency range. logically less boost would seem to have an inverse affect on the life of the engine, and naturally if you apply more pressure without accounting for it, you would expect less reliability. many people are running flashes and chip programs which see up to 1.2 bar, and still they seem to be holding up well. on turbos, k16's especially, higher boosting beyond 1.2 bar does not seem to be absolutely necessary as a way to generate massive power levels. look at some of protomotive's cars or the european tuners' cars, such as psi motorsport. beyond 1.2 bar, it seems more efficient to upgrade to some hybrid turbo, whether it be big garretts, kkk borg warners with garrett internals (e.g. k24/gt35), or kkk borg warners with kkk compressor (k24/k26), is a preference in tuning style. european tuners seem to modify internals more and rely less on high boost pressures. sorry to get on tangent a bit. from what i've read it seems that beyond 1.2 bar isn't necessary, yet many have had success in reliability (fault codes unrelated to actual boost pressure aside) up to and including that level. beyond that, it seems swapping turbos and then getting into the motor (new rods when approaching high hp levels like 700hp) is the logical step up.

 

A K16 will not sustain 1.3 bar anyway. You WILL burn it up trying. The K24 also has an efficiency issue maintaining that level as well.

I have about 44K miles on mine at stupid HP levels (opened up of course) and the only issue I have is keeping it clean! As mentioned in previous threads, there are always trade offs in the HP game. You have to choose where you want your power. If you think the HP numbers make the car you are wrong. Look at the TQ, the power under the curve. That is what tells the story.

 

Tom,
Didn't take long for the bug to bite, did it? Definitely jumping in with both feet it would appear.
Remember, the slippery slope has no end!
Have fun!

 

Lewis, knew you would say something!! Oh well, cant fault me for wanting a little more hp! Still scared to do what the big hp guys here do, they are experts and know what is what, I'm just a car dummy and want a little more out of the car!
Anyway back to the thread,thanks for great info, Dock, KKev, PPhd. Would like to run about 1 bar, seems safe?? what does that give hp wise on an X50?? (oh yea, with 100 cell cats and cargraphic exhaust)
Great thread, thanks for all the expert opinions!!

tom

 

Just do an exhaust and a flash that should get you to 500 hp safely.

 

thanks Buddy, was waiting for your input. What will the flash put the boost too? I still am planning no cats and what do you think of straight pipe from cat out the back sans muffler? Does the car like that set up or will there be problems

thanks again for you and everyone's input, been big help, but driving my mechanic crazy

tom

 

From Evoms.com website:

Porsche GT2/X50/S
Program Model And Year ECU Part Number Multi-Program Options Flashloader Compatibility HP Gain TQ Gain Price
Stage 1 2002- GT2/X50 0 261 206 241 TBR Yes 60-70 65-75 $3500
Stage 3 2002- GT2/X50 0 261 206 241 TBR Yes 90-100* 90-100* $3500
Stage 4 2002- GT2/X50 0 261 206 241 TBR Yes 140-150* 160-170* $3900

Just the flash. Not sure the boost level but probably max 1.2

 

No issues and 1.2 bar.

 

Are you referring to the motor in general or to stock K16 turbos?