Just ordered an EFIE - BrightGreen FeverBuster
 

Just ordered the 'FeverBuster-A' from BrightGreen Inc.
Electronic Fuel Injection Enhancer (EFIE)

https://www.brightgreen.us/feverbus.htm

Wondering who else here has or is running a similar device? How did it work leaning out the car? Any substantial increase in fuel economy? Any negatives?
I am traveling into unknown territory! :) Any tips?
I will post my results in this thread.

Another popular one I found was Eagle Research's. Available as plans or preassembled.
https://www.eagle-research.com/store/...8f67f8671dc540

I've used the Eagle Research EFIE...have one in my truck to test when I get some other things done to it....like the odometer fixed. :D

All I can say is that you have to let the ECU adjust to the change...it's not an on/off kind of deal. Make gradual changes.

Be sure you connect it right.

You should gain some mpg from using one alone, but they are mainly meant to be used along with other mods like fuel heat or acetone.

But each car will act differently. If you have a scangauge...it will be easier to tweak.

Thanks for the input ZugyNA.

Just got back from a business trip and the EFIE was waiting for me at home.

Hopefully, I will install it Sun/Mon. I was also looking at heating the fuel...one step at a time. ;)

How much did you pay for this ?

XFi -

I have the eagle-research EFIE one. I also have a digital AFR gauge :

Air/Fuel Ratio (AFR) Gauge Online ...
https://www.gassavers.org/showthread.php?t=4741

I know the EFIE works because I can see the AFR go lean, and I can feel the engine lose power. However, it looks like you won't notice a difference on your scangauge :

Civic HX and Scanguage?
https://www.gassavers.org/showthread.php?t=4940

Which has a URL link to here :

Re: New SG Firmware Thread.
https://www.cleanmpg.com/forums/showp...65&postcount=8
Sooooo, unless you have an A/F gauge (you can make an LED one for cheap). I think that you have to watch your gas gauge to see the improvement.

CarloSW2

The Fever Buster costs more than the Eagle Research...
The Eagle Research's is 60.00...
https://www.eagle-research.com/store/...d7b6495dee66b2
The similar FeverBuster-B is 93.00
I purchased the FeverBuster-A for 155.00
https://www.brightgreen.us/orders.htm
After talking with the owners of BrightGreen (small family company), I was sold by their assurance of a higher quality product and opted for the 'A' Model with the on/off switch already built in.
CarloSW2, Thanks for all the info and the heads up on the ScanGaugeII...I probably would have been scratching my head thinking that I didn't have it hooked up right, or I just spent my money for nothing. :o

XFi -

Most excellent. I had to jury-rig my own. You may be very right on the quality issue. One thing that the Eagle Research doesn't tell you until after you bought the gizmo is that it is temperature sensitive. That is not cool, because it means that for ease of use, you need to discover a middle-ground setting that will work for when the gizmo is hot or cold. I think I will create an "insulation box" for it down the line. The adjuster on the $60 one is a joke, you can't attach a knob onto it because it is a teeny-tiny screw that you spin.

Yeah, the only time you'd know the thing was working was when it was so lean that the engine was running rough (not Ruff!!!).

CarloSW2

Does anyone have any time/mileage gaslog, which reflects a before/after value for any mileage improvements from using one of these devices?

Gary -

I don't have one because I don't know how to quantify it. Also the behavior on mine isn't as I expected. On mine, it doesn't move from an average 14.7 to an average 14.7 + bias X. Instead, it creeps up to a higher average, and later on dips back down to 14.7 for a while. This is probably the influence of the second 02 sensor that is used to keep the catalytic converter healthy.

EDIT : *IF* it did work as originally expected, I could predict and test for fuel savings based on the new AF ratio.

I need to get my butt in gear and publish my installation.

CarloSW2

Yes the ER EFIE is temp sensitive so you want to place it in the cabin in a neutral zone away from heater/AC flow and sun. The temp sensitivity might be planned. Why? Cause you'd want it to put out less mvs when starting up cold...so your car will run right....more mvs after warmup.

No. You DON'T want to try adjusting it while driving. Don't ask how I know.

The ER EFIE has been redesigned...new board. I'd put the board in a small plastic box.

I think the FeverBuster is more for '96 and later cars.

Not sure I'd pay extra for a switch though...since they work by slowly being adjusted to the ECU....once tweaked...you'd want to leave them alone?

I think the FeverBuster tweaking instructions make more sense though....start low and work up? Where as ER says to start around 300 mvs.

I have limited experience with one car (ER EFIE) and ended up adjusting it to around 200 mvs or so....anything above this caused poor running starting out cold.

The FeverBuster idea of using a vac gauge to adjust it is something I'll have to try.

Just INSTALLED an EFIE - BrightGreen FeverBuster
 

Finally got a chance to install the FeverBuster!!! About time, but I still have to adjust/tune it. I have it installed in my center dash compartment underneath my radio. The dial adjusts it from 0mv to a little shy of 400mv. I just dialed it in to about 200mv until I get on the highway and check if the scan gauge reads any improvement. Hopefully it will and I won't have to wait until a fill. I tried to make the wiring and install as factory looking as possible (so the dealership doesn't question or take note of it/as not to void my factory warranty) and the compartment hides it well. Hope to get a couple tanks with just the EFIE (will TRY to hold off on any other mods/additives), then I will be trying a few oz. of Acetone with it.

XFi -

My theory that belongs to me is as follows ... *ahem* ... This is how it goes. The next thing I'm going to say is my theory. Ready? ... *AHERRMMM* ... This theory goes as follows and begins now :

Since the ScanGauge does not use the short/long term fuel trims, I don't think it is registering the effect of the EFIE.

CarloSW2

If they didn't send you any instructions...you should use this info to adjust it?

https://www.brightgreen.us/feverbus.htm

From my experience you don't want to reinvent the wheel....use their suggestions?

Oh, I definately will be trying to calibrate it (Today) like they suggest. I was just eluding to the possibility, previously mentioned by CarloSW2, that the scan gauge may not show an improvement (thus making it impossible to calibrate it according to the instructions). I should know soon enough.

They did just update the calibration instructions (in the link you posted)...https://www.brightgreen.us/feverbus.htm...they are slightly different than what I have. I will utilize the updated instructions. Thanks! :)

Well, just got done with over two hours of test runs to calibrate the EFIE. My daughter wasn't the happiest camper (drafted her to help me).

After punching the numbers into excel, I have come to the conclusion that either a more controlled calibration method is needed or that the scan gauge is not reading the mileage improvements as CarloSW2 had stated.

I was hoping for results that showed a constant increase/decrease in conjunction with the millivolt reading/input. My calibration tests consisted of 17 runs approximately 4 miles each (one way, then the other). I took the average of each run and I had adjusted the dial 20mv per run (0 to 320mv). Out of all the numbers...the best run was at 240mv.

I recieved no check engine light until I was completed the testing (I guess it didn't like the 320mv run :o ). I recieved a P2097 code which states 'Post Catalyst Fuel Trim System High Limit'. The Post Cat O2 sensor obviously did not like what it was seeing. I wonder if it is trying to compensate (or is) for the precat o2 readings.

I conclude that more testing must be done, but for the time being, I will dial the EFIE to approx. 240mv and check with the next fill up. I will try again next week with calibration.

XFi -

That is the same thing that I think I am seeing with my Eagle Research EFIE. Since I have the benefit of a digital AFR gauge, I *know* the exhaust 02 sensor is running lean :

Eagle Research EFIE Online ...
https://www.gassavers.org/showthread.php?t=5036
I do think you will see an improvement when you fill up your tank. You can recalibrate the SG for this, but this will be an average bias the SG imposes over your whole tank, not the real-time direct effect of the EFIE.

CarloSW2

Feverbuster -B
 

If anyone is interested in Purchasing A Feverbuster -B Which Retails For 90.00+ does, IM willing to sell mine for $50.00. Please email me at David_Doner@hotmail.com if you are interested!! Thank

Scan Guage II has new downlaod for "X"Guage at www.scangauge.com/support/

Maybe test a spread around 240 mv in 10 mv steps? 220 to 270 mvs? Wonder how long it takes the ECU to adjust totally to a change in mvs.

I KNOW for a fact that the fuel trim tables of my OBDII Chevy WILL compensate for the readings from the cat-back o2 sensor. Which is why I will incorporate 2 EFIE's into my particular system. Gotta make the system completely blind.