View Full Version : DIODE in ecu

08-26-2007, 11:34 PM
did anyone hear that if u put a 4.7v diode instead of 5v diode in ur ecu somewhere u will run at 17 psi sinetad of stock 5/7psi? does anyone know which wire and how to do it. read this site under diode


08-26-2007, 11:36 PM
its wired into the map sensor and only works on 00+ audi's

08-26-2007, 11:39 PM
so u wouldnt say to do it on my 97 audi a4 1.8t

08-26-2007, 11:40 PM
The nice thing about this mod is that it’s free power. However, there are atleast two things you SHOULD have done to not worry about anything bad happening…this write-up IS to get you lots of power efficiently right? Anywho, the wastegate is a small flapper valve inside the exhaust side of the turbo that opens to allow exhaust gases to go around the turbine, and thus keeps the turbo from spooling up anymore. The way it works is you have an actuator with a vac nipple and an actuator rod. As you build boost, the charged air goes through the line into the actuator, and pushes on a piston inside, that then pushes the rod. The rod is attached to the flapper, so when the rod moves, the flapper opens. To “crank the wg,” you move the 2 nuts downward to pull the rod away from the actuator. This way, the flapper stays closed longer, thus giving you quicker spool, a higher boost spike, and more boost at redline. You’ll need a 10mm open end wrench for this. Get around to the passenger side of the engine bay, and look down behind the head. You’ll see the rod. First, turn the bottom nut down (clockwise) say 5 full turns. Next, tighten the top nut the same way. Once both are tight, you’re ready to go. Go drive the car and watch your boost levels, and if you feel safe, don’t tighten anymore. If you feel like doing as much as possible, turn the bottom nut until you have about 1.5-2 full turns LEFT and stop there. If you go too far, you’ll completely shut the flapper and not have any boost control.


08-27-2007, 12:52 AM
thats not for your car... its for the 00+ with map sensors if you try and run that much boost your ecu wont know how to compensate for the extra air so you will run lean.

08-27-2007, 02:31 AM
okay thanks for the help what did u hear about tighting the bolt on our wastegate?

08-27-2007, 03:13 AM
on a <00 the only thing ive really heard of people doing is putting in a mbc to get a couple psi more. just get a neuspeed chip its like $200 http://www.supremepowerparts.com/applications/1997-2001_Audi_A4_Quattro_1.8T.aspx/1/1030/Neuspeed_Engine_Management_Upgrade_1.0_Bar_Chip_Up grade