Fox Maf Questions

[addermk2]

Rumor is that it's less than $300.

 

[jrichker]

This is actually rather poor tech information. His car does not NEED a calibrated maf. However it is the easiest and fastest way to make the car run.

My opinion on this matter is that you SHOULD get it tuned. Regardless of whether or not YOU think it runs ok. A tune will allow you to run literally any maf on the market, with any injector that is compatible with the pcm. A prime example of this is my car. I had trouble dialing in my fuel injector slopes, so I hooked up my stock maf and adjusted the slopes to their proper setting. Once that was done, I hooked my HPX maf back up, and tuned the MAF transfer function.

So yes, for about 3 days, i was running a stock F1VF 94-95 maf with my 900cc (83#) injectors.

As for the fuel boiling off due to having a large pump... I run a 416lph walbro in my tank. It runs 100% all the time, and is capable of supplying enough fuel for 900hp on pumo gas, or around 750 on E85. I logged my fuel temp in my return line. It was 12* warmer than ambient temp. Hardly something I would concern myself with.

I would be very interested in knowing what sort of equipment you used to capture data for the fuel temperature in the return line. That isn't exactly a common feature. What sort of sensor did you use, where did you locate the sensor, and how did you wire it up? Pictures?

 

[addermk2]

Moates Quarterhorse, Binary Editor, DataQ, and a ...

http://zeitronix.com/Products/ECA/ECA2.shtml

 

[jrichker]

Moates Quarterhorse, Binary Editor, DataQ, and a ...

http://zeitronix.com/Products/ECA/ECA2.shtml

To quote your own words "addermk2 said: Anyone with a keyboard can ctrl-v... "

Show us the pictures or other creditable proof...

After following the zeitronix.com link, there are no installation instructions for the ethanol/gasoline sensor. It would make sense to install it in the pressure feed line, since it is more beneficial to know the temperature of the feed to the engine and not the return.
That plus the amount of fuel in the return line decreases as demand for fuel increases, This decrease in flow could cause erroneous readings on the gauge unit.

 

[90lxwhite]

Just like you don't NEED a custom tune

Not always true. My stock 95 wouldn't idle after a cam swap w out a tune.

 

[addermk2]

After following the zeitronix.com link, there are no installation instructions for the ethanol/gasoline sensor. It would make sense to install it in the pressure feed line, since it is more beneficial to know the temperature of the feed to the engine and not the return.
That plus the amount of fuel in the return line decreases as demand for fuel increases, This decrease in flow could cause erroneous readings on the gauge unit.

While that may make sense on a stock vehicle, it would be foolish on mine. The ID of the sensor tube is 3/8" (which is exactly the same as my return line). This 3/8 sensor would cause a rather large restriction in my -10 feed line.

 

[addermk2]

Flex fuel Sensor Technical Specification:
Measuring range: 0…100% Alcohol (ethanol) in fuel mixtures
Sensor Accuracy: 5% of the mixture ratio
Output characteristic: Linear
Operating temperature: Environment -40°C… +125°C, Fuel -40°C… +90°C
Maximum fuel pressure: 10 bar, (145 psi)
Maximum pressure drop: 0.1 bar, (1.45 psi)
Maximum flow: 200 l/h
Supply voltage: 6…18 Volts DC
Sensor Temperature error: < 1.5%
Response time: < 250 ms after power on at any temperature
Design: Suitable for the installation in motor vehicles, independent of position. Housing is waterproof. Always check for fuel leaks!

200 LPH flow capacity, and I run a 416 LPH pump. Do you see the flaw in your logic?

 

[jrichker]

200 LPH flow capacity, and I run a 416 LPH pump. Do you see the flaw in your logic?

Makes sense to do it that way with coupled with the information in your post with pictures of your car.