computer box upgrade

[Flying V]

hi guys! its been quite awhile since I last logged in. I'm thinking of doing some upgrades to my gt3 (mk1), and one of the things I plan to do is upgrade my computer box. has anyone here done this kind of upgrade to their gt3? if so, how is it?

techart said they can upgrade my computer box and after modification they claim my car will have 395hp and 450nm of torque!

what do you guys think!? any other suggestions!?

thanks and God bless!

ram

[clord]

Hi Ram.... In my personal opinion, there is little to be gained in chipping or re-flashing a naturally aspirated car these days. The factories usually get all they feel they can from their motors without unduly pushing the limits of durability. On a naturally aspirated motor, about the only thing that could make a difference (all else being equal) is the ignition timing. A little more advance often gets a little more torque in low-mid range and a few horsepower at the top...but, with the possibility of "bouncing" off the knock sensor with pre-ignition/pinging depending on the quality of the fuel you can find. The motor will produce the most just short of pre-ignition, but, controlling the ignition advance with the knock sensor/retard process is not the best way to manage the thing. You can reduce the pre-ignition effect with a little more fuel, but, then the O2 feedback loop steps in to bring the mixture back toward stoichiometric (ideal combustion for the cats to deal with). Sure, factories have to make assumptions about the quality of fuel you use, but, they are highly motivated to get all the performance they can out of your motor without introducing engine life-shortening conditions. For what it's worth, a friend had his 993 motor chipped and tuned professionally on a chassis dyno by a Very Well Known race shop. A few months later, as we tore through the empty roads of the American Desert, his motor holed a piston and broke several sets of rings due to pre-ignition. You pays yer money and you takes yer chances.

[aracerx]

Anyone with a REAL shop and REAL experience will concur with simple fact that "chipping" a normally aspirated "OEM" engine will result in a higher output of dollars to the service that is NOT performing any service at all!.

We only recommend reprogramming turbocharged porsche engines as a matter of fact. havefuntakechancesdriveporsche-Mark-www.formulamotorsports.com

Hi Ram....  In my personal opinion, there is little to be gained in chipping or re-flashing a naturally aspirated car these days.  The factories usually get all they feel they can from their motors without unduly pushing the limits of durability.  On a naturally aspirated motor, about the only thing that could make a difference (all else being equal) is the ignition timing.  A little more advance often gets a little more torque in low-mid range and a few horsepower at the top...but, with the possibility of "bouncing" off the knock sensor with pre-ignition/pinging depending on the quality of the fuel you can find.  The motor will produce the most just short of pre-ignition, but, controlling the ignition advance with the knock sensor/retard process is not the best way to manage the thing.  You can reduce the pre-ignition effect with a little more fuel, but, then the O2 feedback loop steps in to bring the mixture back toward stoichiometric (ideal combustion for the cats to deal with).  Sure, factories have to make assumptions about the quality of fuel you use, but, they are highly motivated to get all the performance they can out of your motor without introducing engine life-shortening conditions.  For what it's worth, a friend had his 993 motor chipped and tuned professionally on a chassis dyno by a Very Well Known race shop.  A few months later, as we tore through the empty roads of the American Desert, his motor holed a piston and broke several sets of rings due to pre-ignition.  You pays yer money and you takes yer chances.

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