Has anyone successfully used a manual or electronic boost controller?
08-28-2001, 07:57 AM
#1
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Has anyone successfully used a manual or electronic boost controller?
I know about why these don't work on our cars, or shouldn't, but I know I COULD get it to work if I really wanted to by fooling the boost and air flow sensors. I also think I could probably produce more hp safely that way because I can tune to my specific car with something like an AFC.
Has anyone even tried it?
Feel free to flame me...
Has anyone even tried it?
Feel free to flame me...
08-28-2001, 07:59 AM
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I thinkn Y4Play used this setup. I have used boost controllers with other cars in the past
but they were Japanese cars (and the cars also had AFC's, GCC, VPC, etc...). It seems from the experience of the board that boost controllers will not work correctly with Audis.
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08-28-2001, 08:05 AM
#8
Biggest problem you'll face is the MAF in the S4 is pre-turbos...
so all of the fuel mappings and such are determined before air hits the intake manifold.
That's why people can't easily install Blow Off Valves, once the air is metered by the MAF, the ECU does it's thing. If you dump air to atmosphere (like a Blow Off Valve does so well), you'll have a jacked up mixture of air/fuel. To remedy this, Audi chose Bypass Valves so that unused metered air can be re-introduced to the intake path, and your air/fuel mix is still correct.
Japanese Turbo cars commonly meter the air just before the intake manifold, which is post-turbo(s). In that scenario, you can install the loudest Blow Off Valves, and all the $200 piggy back electronics you want to adjust things.
Fact is, any serious tuner of Japanese cars will recommend pulling all those $200 piggy back units off of the car, and installing a programmable ECU package.
The last thing you want to do is de-engineer your Audi. Smart people spent a lot of time building your engine and ECU system, don't do them a diservice by technically de-advancing your car.
If you want more power, buy a chip. If you want more power than that, buy new turbos.
Trust me, Bosch Motronic is a better system then a $200 ApeXi boost or AFC controller. You don't want 'em.
FWIW...
That's why people can't easily install Blow Off Valves, once the air is metered by the MAF, the ECU does it's thing. If you dump air to atmosphere (like a Blow Off Valve does so well), you'll have a jacked up mixture of air/fuel. To remedy this, Audi chose Bypass Valves so that unused metered air can be re-introduced to the intake path, and your air/fuel mix is still correct.
Japanese Turbo cars commonly meter the air just before the intake manifold, which is post-turbo(s). In that scenario, you can install the loudest Blow Off Valves, and all the $200 piggy back electronics you want to adjust things.
Fact is, any serious tuner of Japanese cars will recommend pulling all those $200 piggy back units off of the car, and installing a programmable ECU package.
The last thing you want to do is de-engineer your Audi. Smart people spent a lot of time building your engine and ECU system, don't do them a diservice by technically de-advancing your car.
If you want more power, buy a chip. If you want more power than that, buy new turbos.
Trust me, Bosch Motronic is a better system then a $200 ApeXi boost or AFC controller. You don't want 'em.
FWIW...
08-28-2001, 08:13 AM
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You are correct about many turbo charged Japanese cars and the positioning the MAF.
However, piggyback electronics like the Boost controller, VPC, GCC, are still a part of most if not many serious Japanese car modifications. True, a dedicated programmable ECU package or Haltech-style management system comes into play toward the upper echelons of power (600+ HP packages in the Supra for example), but for most people the piggyback electronics are great and more than adequate.