Aero mods using RBL collision wrap

[pgfpro]

Originally Posted by SVOboy

Yeah, just get an MPGuino and you'll not need to drive as much and get much more accurate results.

I running after market injectors with a higher then stock fuel pressure is there a way to program bigger injectors and a higher fuel pressure?

[SVOboy]

Yessir!

[pgfpro]

Originally Posted by JasonG

Yeah, like more plastic!!

Cool stuff, will a hair dryer make it shrink tight like window film?
How wide does it come?
How well does it stay on? Yeah you need time to answer that one.
Keep it smooth dude !

I didn't try a hair drier but the heat of the sun did make it tighter.

The widest is 48" I used a 36" x 100' ft roll.

It sticks very well I just put the masking tape as a precaution.

It stays on for a long time. I work in the auto body business and have a ton of customers that have had it on for months without any problems. Even in rain and snow it holds up very well.

[greasemonkee]

Potential?

[pgfpro]

Originally Posted by SVOboy

Yessir!

Does it use pulse width of the injector and keeps a sum?

Then keeps track of the VSS.

Then calculates fuel flow and distance traveled?

Do you need your injectors flow tested at (x) psi and (x) pulse width.

So then you will have a true amount of fuel that was measured?

The reason I'm asking is because I have all my injectors flow tested for racing reasons. Whats strange is almost 90 % of the injectors don't flow what they are rated at. For example the last set of injectors That I had flowed were 450cc/min injectors that flowed 520cc/min

Heres the pic of them being flow tested.


Or does this instrument use a fuel flow meter?

[McTimson]

It uses pulse width.

When you first set it up, you can use values close to what you expect. The beauty of it is, it's very easy to calibrate the values for what you're actually getting. Just pump gas at the same station, same pump, 2 times in a row, and you can adjust the value in the mpguino to reflect the amount you actually used.

My mpguino's reported gas usage is usually off by maybe +/- .2 gallons, for about a 10 gallon fillup.

[pgfpro]

Originally Posted by McTimson

It uses pulse width.

When you first set it up, you can use values close to what you expect. The beauty of it is, it's very easy to calibrate the values for what you're actually getting. Just pump gas at the same station, same pump, 2 times in a row, and you can adjust the value in the mpguino to reflect the amount you actually used.

My mpguino's reported gas usage is usually off by maybe +/- .2 gallons, for about a 10 gallon fillup.

OK this is where I have a problem trusting it. I'm running in open loop all the time.

Pulse width base on calibration from actual data received from the filling at the pump station. Your relying on the variable filling at the pump.

Just pump gas at the same station, same pump, 2 times in a row, and you can adjust the value in the mpguino to reflect the amount you actually used

Back to square one.
I use the same filling station and the same stall every time.

If you just rely on pulse width, your actual volume won't be right. Injectors don't flow them same through out their duty cycle. their not linear.

Voltage injector dead times play a huge part in this at low pulse width 3.0 m/s or less.

To me all this gadget is doing is taking the pulse width after you calibrate it and tracking usage based on pulse width. Not the weight of the fuel or volume.

If you fill at the pump, you have the same variable, the variable of getting the same fill every time.

If your voltage changes at the fuel pump it won't be accurate.

If the density of the fuel changes it won't be accurate.

Pulse width is just pulse width. It open and closes at a given time
per-engine cycle. Its not a flow meter.

Now I'm not saying my last fuel log was right. I need to do a long mile test run. I'm not to sure what that should be after reading on here that the New York test (Chang's 118mpg CRX) thought a 100 miles was good enough? I guess not?

The rally, organized by the Adirondack Motor Enthusiasts Club (AMEC), took place August 23 over 104 miles of scenic, lightly travelled, winding roads through the southern Adirondack mountains (with admittedly very MPG-friendly speed limits of 45 to 55 mph).

Would you guys agree that the coefficient of volume expansion of gasoline is 950 x 10-6????????

[SVOboy]

Even if the MPGuino calibration is based on fill ups, basing it on several (or more) 10+ gallons fill ups is going going to give you much more accurate results than a some 100 mile runs.

Furthermore, even if the number is off, the relative numbers will be good for comparisons sake. So just go with it, I say. I didn't even calibrate mine, I just used a number from someone else and it's always been dead accurate.

*shrug*

[Luxbg]

This might be just what I need for my 7000 mile road trip next summer! Any idea where a layperson can buy the stuff?

[dcb]

re: mpguino, The main variables (which you can set through a menu) are:
microseconds per gallon
vss pulses per mile
injdelay

To calibrate with a pump, you do need to be very consistent, some details here:
Mpguino calibration - EcoModder , though there are certainly other ways to calibrate, this is the general purpose method, and used to good effect by many folks.

re: pulse width, each injector pulse is measured in the realm of microseconds, and will have a constant (injdelay) subtracted to account for injector opening time.

So the modified pulse widths and the vss pulse counts are accumulated and displayed as instant, tank, and current "trips". Current being useful for short term experiments also (resets after car/engine stop for 7 minutes/whatever you set it to).

System voltage can affect accuracy as the injectors open more quickly or slowly, so some recalibrating is in order if you remove your alternator, i.e.. Don't know that fuel pump voltage matters as much as the regulator pressure setting though, sure "It Depends").

Quite a few honda users here, don't know about turbo though, but even if you only get a relative reading it is useful for ABA testing, or just plain "beating your high score".

PGFPro, Does your del sol maintain a reasonably constant pressure differential between the fuel rail and the manifold?