[e46mpwr]

Does anyone have a cold air intake on their 335d?

Originally Posted by 335dM

Cold air intake for 335d ????

[Ron1n]

Originally Posted by e46mpwr

Does anyone have a cold air intake on their 335d?

No such beast available as of right now.

Regarding my VAC impressions, I'd say it's a good middle of the road option. Not the most power, not the least, and it gives good gas mileage.

Regarding hotrod's results...I need to get me some DR's, because traction with the power I'm putting down is my chief problem. I'm in the 5's and low 13's on streets.

[Thud]

Right now my car is still stock but I'm leaning toward the VAC. Assuming their claims are accurate (i.e. only the timing of the fuel injection is changed, and no additional fuel is used) it seems it won't affect the lifespan of the DPF over the long haul. I'm not looking for ridiculous gains, since the car is fun enough even in stock form.

If I got a JBD I'd probably just leave it at 65%. Also, if the JBD is telling the computer that a different amount of fuel is being used vs. what's actually being used, then it will skew the computer readings, won't it? i.e. indicated fuel economy, distance-to-empty, etc.

[cssnms]

Originally Posted by Thud

Right now my car is still stock but I'm leaning toward the VAC. Assuming their claims are accurate (i.e. only the timing of the fuel injection is changed, and no additional fuel is used) it seems it won't affect the lifespan of the DPF over the long haul. I'm not looking for ridiculous gains, since the car is fun enough even in stock form.

If I got a JBD I'd probably just leave it at 65%. Also, if the JBD is telling the computer that a different amount of fuel is being used vs. what's actually being used, then it will skew the computer readings, won't it? i.e. indicated fuel economy, distance-to-empty, etc.

They are both piggybacks and I do believe the VAC and JBD operate and make power in a very similar manner, in that they both intercept the signal from the ECU to the high pressure rail sensor, in short they are signal benders. The only way to effectively modify injection timing is by reprogramming the ecu. And yes, your theory regarding skewing the computer readings is correct, but that theory applies to both. If your ecu is being told not enough fuel is being delivered then your computer is reading that your consumption is lower. Diesels make extra power by injecting more fuel which is accomplished either through increasing injection timing or increasing fuel pump pressure; more fuel being delivered translates into more power, which more often then not yields lower mpg's. That said under certain circumstances you are likely to experience better than avg fuel economy simply because your engine doesn't have to work as hard to maintain speed since it is makeing more power lower in the rpm band, which I think will make itself more evident during highway traveling.

[Ron1n]

Originally Posted by cssnms

They are both piggybacks and I do believe the VAC and JBD operate and make power in a very similar manner, in that they both intercept the signal from the ECU to the high pressure rail sensor, in short they are signal benders. The only way to effectively modify injection timing is by reprogramming the ecu. And yes, your theory regarding skewing the computer readings is correct, but that theory applies to both. If your ecu is being told not enough fuel is being delivered then your computer is reading that your consumption is lower. Diesels make extra power by injecting more fuel which is accomplished either through increasing injection timing or increasing fuel pump pressure; more fuel being delivered translates into more power, which more often then not yields lower mpg's. That said under certain circumstances you are likely to experience better than avg fuel economy simply because your engine doesn't have to work as hard to maintain speed since it is makeing more power lower in the rpm band, which I think will make itself more evident during highway traveling.

The computer learns and makes adjustments, btw. When I first got my JBD, I got some crazy readings for my MPG and my distance to empty (talking it showing I was going to get 800 miles on my tank). The more I drove, the more it stabilized.

[cssnms]

Originally Posted by Ron1n

The computer learns and makes adjustments, btw. When I first got my JBD, I got some crazy readings for my MPG and my distance to empty (talking it showing I was going to get 800 miles on my tank). The more I drove, the more it stabilized.

True, I have noted the same thing, but I still don't find that it is as reliable/accurate as it was before I instaleld the JBD, which is simply a function of how these fuel boxes operate.

[Thud]

Originally Posted by cssnms

They are both piggybacks and I do believe the VAC and JBD operate and make power in a very similar manner, in that they both intercept the signal from the ECU to the high pressure rail sensor, in short they are signal benders. The only way to effectively modify injection timing is by reprogramming the ecu.

In that case I'm not sure how to interpret the information on the VAC info page:

Q) With more power, how does my car not consume more fuel? Will it be as reliable?

This is a logical and completely normal question from a gasoline car perspective. Know that the diesel engine is always ingesting the same amount of air per revolution as there is no throttle plate in a diesel engine. What we do is alter how and when fuel is delivered without increasing the amount of boost or fuel.

What does that mean, exactly?

[cssnms]

Interesting statement. contact them and ask for clarificaion. If the module is not increasing boost to make more power it has to increase the amount of fuel being delivered at any given rpm range; its the only way diesels make more power.

[e46mpwr]

Where are you going to get your times and how often do you go? We should meet up there sometime.

Originally Posted by Ron1n

No such beast available as of right now.

Regarding my VAC impressions, I'd say it's a good middle of the road option. Not the most power, not the least, and it gives good gas mileage.

Regarding hotrod's results...I need to get me some DR's, because traction with the power I'm putting down is my chief problem. I'm in the 5's and low 13's on streets.

[Ron1n]

I haven't run 'officially' in a while...they're all personal times with iPhone apps (I need me a Racelogic). And yes, almost 2 years later, we still need to meet up...rofl.