12-19-2000, 04:53 AM
Ok, I'm new to the 1.8t so this may be nothing. First I have a 97 1.8tq w/APR chip. I recently installed a boost guage and learned several things. In first and second gear rmps around 2K-4K boost is 15 lbs. From 4K-6K rpms boost tails off to about 10 lbs or less as the rpms rise. Does this have to do with the torque curve? Or should I have full boost up till the red line or whenever I let off the gas?
12-19-2000, 05:21 AM
At 3500 rmps on the highway you could be anywhere from -20 to 15 depending on whether you are under hard acceleration or just cruising.
12-19-2000, 06:43 AM
Most chips back off the boost at higher RPMs to avoid overspinning the turbo, and to keep the turbo somewhat in it's (in)efficiency range.
12-19-2000, 11:55 AM
boost on a turbo'd car comes only as a result of the load put on the motor not rpm dependant. The ECU / chip, on the otherhand, will artificially limit or control the ammount of boost at a particular rpm according to the desire of the chip tuner by actuating the waste gate. Now shake (and/or kiss or what ever guys do) and make up.