Installing a MPGuino to help save fuel on my E320 - PeachParts Mercedes-Benz Forum

Oldbeaver · #1 08-12-2012, 10:15 PM

Quote:

Originally Posted by Terry M

My E320 does not have a Vacuum guage or a mileage guage. OBDII only came out in 1996 for North American cars from what I have read. Part of the reason I bought the MPGuino kit was for interest and economy. I learnt much from building the kit supplied by Fundamental Logic. The theory behind the electronis board and the components are explained extermely well in lecture notes supplied by SparkFun Electronics - News

Dear Terry,

I have a Mercedes 300E and a MPGuino, which I want to install on it.

To get the VSS signal is rather easy, but not the injection signal. We have the same problem. Let us share our experience to beat this difficulty.

My car has a "economy" gauge, which provides an idea of economy based on the admission vaccum generated by the engine. However, this variable isn´t always a sign of efficiency or ineficiency, something you car read in an article in Auto Speed of Australia. They explain that very clear.

Second, even if that gauge may work sometimes, the visual info it gives is too course, one cannot assess the impact of a single mod on fuel yield in the car based on this gauge. We need more precise information over some, say, 100 km to be sure.

Then comes MPGuino to solve it.

Then, we need to spot a signal on the ignition system of our cars to be used in the MPGuino device.

Do you have any ideas?

I have the circuits but they are difficult to me to understand, first because english is not my first language, and second, because mechanics and electronics are not my first profession either. I am a forester.

Shall we continue? What have you discovered so far?

Looking forward to hear you,

OldBeaver

Note: Can you tell me what is a "trackback"?

cullennewsom · #2 08-12-2012, 10:27 PM

Quote:

Originally Posted by Oldbeaver

Dear Terry,

I have a Mercedes 300E and a MPGuino, which I want to install on it.

To get the VSS signal is rather easy, but not the injection signal. We have the same problem. Let us share our experience to beat this difficulty.

My car has a "economy" gauge, which provides an idea of economy based on the admission vaccum generated by the engine. However, this variable isn´t always a sign of efficiency or ineficiency, something you car read in an article in Auto Speed of Australia. They explain that very clear.

Second, even if that gauge may work sometimes, the visual info it gives is too course, one cannot assess the impact of a single mod on fuel yield in the car based on this gauge. We need more precise information over some, say, 100 km to be sure.

Then comes MPGuino to solve it.

Then, we need to spot a signal on the ignition system of our cars to be used in the MPGuino device.

Do you have any ideas?

I have the circuits but they are difficult to me to understand, first because english is not my first language, and second, because mechanics and electronics are not my first profession either. I am a forester.

Shall we continue? What have you discovered so far?

Looking forward to hear you,

OldBeaver

Note: Can you tell me what is a "trackback"?

Hey OldBeaver, this thread is really old, 2009. Terry may not even be around any more. If Terry doesn't get back to you, you can send me a PM, and I might be able to give you a hand. I'd suggest tying in to the tach signal, since there's nothing electronic on the injector pump. I'm not sure that will get you much in the way of economy information though.