Rmi scoops review
06-13-12, 10:08 AM
#196
A more scientific test or at least one based on a greater pool of data would be for one of the individuals who has logged thier gas milage (hand caluculated) over the life of the ownership of thier F as a baseline. Then if they install the scoops and run the car for a month or more doing thier regular driving as before charting the MPG. Comparing the new numbers to the old would give a fairly decent review of any benifits from a MPG standpoint. As for a HP/TQ increase, I think that will be harder since the device is not easily dynoed and trap speed/ET is so variable based on weather, temp, elevation and driver consistancy.
06-13-12, 10:44 AM
#197
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I keep a spreadsheet of all my mileage and fuel usage and have since I purchased the car. It doesn't account for the times that I have stepped on it harder than others or the 18 miles the shop put on it "checking the brakes!" Overall I have filled up 17 times since I bought the car before installing the scoops. At that time I had an running average of 18.272 miles per gallon. Over the next month, the mileage per gallon has fluctuated but has started to increase. I have filled up 3 times since and the running mileage has gone up .2 mpg with tank mpgs of 18.4, 21.2, 19.8.
It definitely seems like it is easier to maintain a higher MPG for me over the last month. This "tank ave" is currently at 21.8. I have the same trip into the office and home every weekday. My weekend driving hasn't changed much over that time span either.
I think the best way to test the product is to get an OBDII port device that connects to your phone or computer that will give you readings for intake pressure and intake temperature. Then run some test, maybe a tankful without the scoops to get the baseline and then run a tank with the scoops and see what the difference is. I really want to do this, but I don't have the OBDII reader.
I look at it as they look nice and functional on the car, they may help with gas mileage and possibly a few hp, but they weren't expensive and they won't do any damage. I call it a win/win.
It definitely seems like it is easier to maintain a higher MPG for me over the last month. This "tank ave" is currently at 21.8. I have the same trip into the office and home every weekday. My weekend driving hasn't changed much over that time span either.
I think the best way to test the product is to get an OBDII port device that connects to your phone or computer that will give you readings for intake pressure and intake temperature. Then run some test, maybe a tankful without the scoops to get the baseline and then run a tank with the scoops and see what the difference is. I really want to do this, but I don't have the OBDII reader.
I look at it as they look nice and functional on the car, they may help with gas mileage and possibly a few hp, but they weren't expensive and they won't do any damage. I call it a win/win.
06-13-12, 01:43 PM
#198
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Unfortunately it's not quite so simple. The switch from winter to summer fuel blends has a significant impact on fuel economy. Running the A/C has a very significant impact on fuel economy, and the amount it runs changes based on OAT (outside air temperature) as does the pumping efficiency of the engine (which is where these scoops would potentially make their difference) because the air density is less when warmer and more when colder. There's also the impact of cold cycle time - how long doe the engine's oil stay below 182F - because the colder it is, the longer it takes to fully heat the engine and the more heat is lost to raising the temperature to target operating temperature from ambient.
It would really be nice if it were easy to quantify this - unfortunately, it's extremely difficult.
FWIW, I've been averaging 23.0 mpg on this tank because the OAT is nice enough that I can turn off the A/C compressor and open the windows. If it were normal summer temperatures, I'd typically be seeing 20.x on a tank of gas, not 23.0. LOTS of little things make big differences.
It would really be nice if it were easy to quantify this - unfortunately, it's extremely difficult.
FWIW, I've been averaging 23.0 mpg on this tank because the OAT is nice enough that I can turn off the A/C compressor and open the windows. If it were normal summer temperatures, I'd typically be seeing 20.x on a tank of gas, not 23.0. LOTS of little things make big differences.
06-14-12, 04:29 AM
#199
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So finally got around to doing some testing last night and I actually found a difference.
Before Scoops and Intake wrapping:
-MAF(LB/MIn) = 40.0 max
After Scoops/Wrap:
-MAF(Lb/Min) = 45.5 max
Before Scoops and Intake wrapping:
-MAF(LB/MIn) = 40.0 max
After Scoops/Wrap:
-MAF(Lb/Min) = 45.5 max
06-14-12, 05:25 AM
#200
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Nice! Thanks for providing some empirical data. Did you by any chance read an intake temp with and without?
06-14-12, 05:47 AM
#201
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I did, but I honestly dont remember 100%. I believe the difference with -5-8 degrees from a base of 91* at WOT. I wasn't really able to finish my review how I wanted because im still trying to figure out why my car is running richer than usual (Problem started driving me crazy and I stoppe recording). Im 99% sure its the Injen intake, but im going to put in my spare MAS sensor just to be sure I dont spend money on parts I dont need. I should have a full review by saturday if the problem is not the intake.
06-14-12, 09:09 AM
#202
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Something is funny with those numbers. You'd DEFINITELY feel a 10+% increase in the butt dyno. The other odd ball is, if airflow is increasing, you should be seeing lean, not rich.
Since the install on the scoops is pretty simple, it might make the most sense to datalog MAF vs. speed for both cases. If the scoops do provide a higher intake pressure, the MAF graphs would be identical at low speeds with an increasing difference as speed increases. This is independent of rich/lean and only focused on the physics of the scoops and their ability to increase pressure to the intake.
BTW, MAF numbers from the ECM are temperature compensated, so the gm/min or lb/min take temperature into account.
Since the install on the scoops is pretty simple, it might make the most sense to datalog MAF vs. speed for both cases. If the scoops do provide a higher intake pressure, the MAF graphs would be identical at low speeds with an increasing difference as speed increases. This is independent of rich/lean and only focused on the physics of the scoops and their ability to increase pressure to the intake.
BTW, MAF numbers from the ECM are temperature compensated, so the gm/min or lb/min take temperature into account.
06-14-12, 10:32 AM
#203
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Something is funny with those numbers. You'd DEFINITELY feel a 10+% increase in the butt dyno. The other odd ball is, if airflow is increasing, you should be seeing lean, not rich.
Since the install on the scoops is pretty simple, it might make the most sense to datalog MAF vs. speed for both cases. If the scoops do provide a higher intake pressure, the MAF graphs would be identical at low speeds with an increasing difference as speed increases. This is independent of rich/lean and only focused on the physics of the scoops and their ability to increase pressure to the intake.
BTW, MAF numbers from the ECM are temperature compensated, so the gm/min or lb/min take temperature into account.
Since the install on the scoops is pretty simple, it might make the most sense to datalog MAF vs. speed for both cases. If the scoops do provide a higher intake pressure, the MAF graphs would be identical at low speeds with an increasing difference as speed increases. This is independent of rich/lean and only focused on the physics of the scoops and their ability to increase pressure to the intake.
BTW, MAF numbers from the ECM are temperature compensated, so the gm/min or lb/min take temperature into account.
06-17-12, 01:35 AM
#205
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Just installed these on my car! The package came with 6 washers, instructions, and the 2 scoops. I had no problems or any issues installing the scoops. Perfect fitment as well!
I have a smoky granite mica ISF with flat black OEM grille and emblem. I got the black scoops and I can barely see them through the OEM grille.
Thanks ISS for the great product!
I have a smoky granite mica ISF with flat black OEM grille and emblem. I got the black scoops and I can barely see them through the OEM grille.
Thanks ISS for the great product!
