What does the chip do, mechanically?
AudiWorld Super User
Joined: Jul 2001
Posts: 11,134
Likes: 72
From: Los Angeles, CA
Re: What does the chip do, mechanically?
It changes the boost pressure of the turbo, yes. At the midrange, it pushes much harder, and at the low and high end, it backs off a little to prevent damage.
On DBW cars (not sure on others), it also matches the increased turbo input with increased fuel.
On DBW cars (not sure on others), it also matches the increased turbo input with increased fuel.
Junior Member
Joined: Mar 2000
Posts: 576
Likes: 0
What it does is...
Change the amount the bypass bleeds off the turbo before the intake. Boost pressure is regulated by managing this valve. It also modifies the injector pulse width to get the fuel mixture right, due to the air increase.
More air, more fuel. More boom when the spark fires.
- Z
More air, more fuel. More boom when the spark fires.
- Z
AudiWorld Super User
Joined: Mar 2001
Posts: 8,207
Likes: 0
I think he's looking for how it alters the boost characteristics...
The answer lies in the electronically controlled wastegate. The wastegate opens to relieve excess pressure and the threshold is controlled electronically, buy the ECU. The "Chipped" ECU holds the wastegate closed longer, allowing more boost to build. The chip also remaps the fuel/air mixture tables to take advantage of the extra intake charge pressure.
AudiWorld Super User
Joined: Jul 2001
Posts: 11,134
Likes: 72
From: Los Angeles, CA
Well
Anyone who says it has no effect is trying to sell you a chip 
Yes, it will put more stress on your engine, and will likely decrease the turbo and engine life. The question is, how much, and is it worth the extra boost?
I think it is worth every lost day of car time.
As for wear and tear, our 1.8's are designed specifically for turbo charging, and will likely not suffer noticiably from the increased boost. I get the impression that boosted turbos do burn out faster, though the change in time does not seem to be a significant difference (i.e., I haven't seen differences of 50% or anything like that).
On a final note, if you don't drive the chipped car hard, it will make no difference. If anything, it might actually be easier on your car. So you can get the chip and then not push it, and you'll have absolutely no problem
- J
Yes, it will put more stress on your engine, and will likely decrease the turbo and engine life. The question is, how much, and is it worth the extra boost?
I think it is worth every lost day of car time.
As for wear and tear, our 1.8's are designed specifically for turbo charging, and will likely not suffer noticiably from the increased boost. I get the impression that boosted turbos do burn out faster, though the change in time does not seem to be a significant difference (i.e., I haven't seen differences of 50% or anything like that).
On a final note, if you don't drive the chipped car hard, it will make no difference. If anything, it might actually be easier on your car. So you can get the chip and then not push it, and you'll have absolutely no problem
- J
Trending Topics
AudiWorld Stories
Bringing Audi to Life for Audi Fans
10 Strangest Audi Designs That Actually Made Production
Joe Kucinski
2027 Audi Q7 and SQ7: Audi Upgraded EVERYTHING!
Michael S. Palmer
Audi Unveils Absurdly Cool New Supercar: 10 Things You Need to Know!
Verdad Gallardo
The Highs & Lows of Every Audi C-Class Generation
Joe Kucinski
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
AudiWorld Uber User
Joined: Mar 2000
Posts: 50,950
Likes: 0
wrong too.... in a way....
the boost is managed thru the opening and closing of the wastegate in the exhaust side of the compressor. Essentially a dump valve to let exhaust gasses bypass the turbine wheel and not spin it. The wastegate is controlled by the actuator arm and vacuum chamber, which is in turn controlled by the frequency valve. The freq valve is an electrically operated valve that portions off the vacuum to the actuator. this freq valve is driven by signals from the ecu.
So... the ECU as it's programmed, controls when the wastegate starts to open and divert the gasses that are causing the turbo to spin and build intake pressure. The ECU also controls spark and fuel dilivery via the injectors which are also electrically driven. The amount to time spent open and releasing fuel is the duty cycle. Thats a small portion of how the 18't works. Tuners modify the parameters which govern the manner the above mentioned components operate, as defined on two and three dimensional maps and matrices.
So... the ECU as it's programmed, controls when the wastegate starts to open and divert the gasses that are causing the turbo to spin and build intake pressure. The ECU also controls spark and fuel dilivery via the injectors which are also electrically driven. The amount to time spent open and releasing fuel is the duty cycle. Thats a small portion of how the 18't works. Tuners modify the parameters which govern the manner the above mentioned components operate, as defined on two and three dimensional maps and matrices.
Thread
Thread Starter
Forum
Replies
Last Post
cparke
A4 (B5 Platform) Discussion
26
Nov 28, 2008 02:03 PM
Jonny K
Audi Original "S" Cars
2
Mar 16, 2007 09:40 AM
aviattor.3
TT (Mk1) Discussion
2
Aug 25, 2006 08:16 AM
JikJak
S4 / RS4 (B5 Platform) Discussion
7
Apr 6, 2001 03:45 PM