Aero mods using RBL collision wrap
 

I did some more testing today with killer results.

My first mod was a product by RBL industries called collision wrap. Its a clear heavy mill. plastic sheeting that's used in the auto body industry. Its for when they get a car in and they need a heavy plastic that can be stretch and put on... as a example side glass or back glass or windshield that was knockout.

http://i147.photobucket.com/albums/r...ideaeromod.jpg

http://i147.photobucket.com/albums/r...delsolaero.jpg

http://i147.photobucket.com/albums/r...earaeromod.jpg

Anyway I thought I would share. This is a great product for doing some aero mod testing.

Great idea man, any data? :thumbup:

I'm still waiting for the result!! :thumbup:

I'm going to have to throw out this run. :(

First off I made to many changes.
1) all the aero mods front and back.
2) Lean burn from 18.5 to 19.0 to today's 19.0 to 20.0 A/F
3) Ran my e-cut out open half the time
4)raised tire pressure up to 55 psi. (I forgot I drop them down for the last two test runs for comfort reasons for daily driving).
5) I averaged more around 56 mph.

Anyway I went my usual loop 66 miles interstate 90 freeway driving.
Temperature was about the same as my last run. Started out 82* F in my town and went up to 86* F in Spokane. No wind at all this time.

Went 66 miles and I could not for the life of me get any more fuel back in the car. It only took 0.627 gallons.

103.66mpg :rolleyes:something is not right there's no way it did this???

The car is really impressive to drive. You can let off the gas and it keeps going forever.:)

You need larger fill ups (or just get an mpguino to be exact about it)

Gas expands :p

Small fills are more prone to inaccurate results. Do you have any instrumentation? That'd be the best way to see any instant changes.

I can't wait to get my ecomodder.com stickies. People were passing me and doing major double takes all day long. My wife wouldn't even ride with me this time. I can't seem to blame her. LMAO.

I need help...

Check out my turbo turtle on the back bumper. hehehe:turtle:

I need one of those definitely. I drive the car for about an hour before testing hoping to preheat the fuel, but it isn't probably enough.

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 ! :turtle:

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?

Yessir!

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.

Potential?


http://i12.photobucket.com/albums/a2...deaeromod2.jpg

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.
http://i147.photobucket.com/albums/r...ervice_032.jpg

Or does this instrument use a fuel flow meter?

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

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*

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

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?

<shameless plug>
http://opengauge.org/mpguino
</shameless plug>

There is a kit too, mentioned in the wiki, but I have not been following it:
MPGuino - EcoModder

BTW, sorry if the thread got hijacked there for a bit.

Anyway, I really like the clear shrink wrap idea, probably not the first time it has been done but it is right up my alley :)

Have you considered doing some coastdown testing? Just need a stopwatch for that and eliminates a lot of variables. (and yes it introduces some of its own, so just deal with it :) )

Can we agree that this is true for both ways.;)

I just think to get the most accurate data. You need to empty the fuel tank and fuel lines. On a EFI car this can be done very easy. I do it all the time from a E85 fill to pump premium fill. Then put in 10 gallons of fuel and run it until its out of gas. Check you mileage. Have a 3 gallon container of fuel in your trunk and go home.

Ben I'm just very frustrated right now. I'm confused on what happen. I did three back to back test the same way and now this. Its got me baffled. I know that the car like all the mods but I have no idea what it just did in mileage.:mad::mad::mad:

Thanks for the info.

Yes its boost/vac referenced.

I understand your frustration, it's happened to me lots of times before, even with instrumentation and things like that.

I think perhaps Dave's suggestion of coastdown testing may be best. Darin does it by filming his speedo so he can go back afterwards and time the video to see exactly how long the coast took, and I figure this may be the best and most repeatable way for your to test out your new aeromods :)

Thanks Man!!!

I need to look into that. I'm a tuner that makes things go fast so this is still new to me as far as areo mods go. In drag racing I just add more power. That's the easy part.;)

You can get it at any auto body supplies store ask for RBL crash wrap.

Ok time to keep my chin up and go for it.

My plan is to drive to Portland Oregon and back. 766 miles round trip.

But first I'm going to drain all the fuel out. Then add a gallon to get me to the station where I will fill up.

I want to get this kamm back thing done!!!

My plans are to use the crash wrap as a form then I will spray on a new Kevlar polyester filler coating that will become the shell. Then attach it with double side tape. Then cut out a window and attach a lexan piece. I will use the crash wrap on the front area again. I need to come up with an idea there?

I just realize the mod you made to it. LOL

Would this be better way, to extend it out past the deck lid?

So, what happened?!