Restricted Air? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
All about MPG All about maximizing your Miles Per Gallon (MPG)

 
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post #1 of 8 (permalink) Old 06-19-2013, 07:46 AM Thread Starter
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Restricted Air?

Hey guys I have an 07 cobalt 2.4l SS/NA anyway I just got a cold air intake and put it on. Now I live in Ohio where we have to have a front plate. Not wanted to put a bracket on and get a little bit of a different look I bent my front plate to where my letters are showing ( look at my profile pic. That should explain) anyway would that being there and not letting air through as much lead to my gas mileage going down? Not a whole lot but from about 25 down to 21-20?

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post #2 of 8 (permalink) Old 06-19-2013, 08:16 AM
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No, that won't cause it at all. By putting on a CAI, you're going to see a small decrease in MPG's as it is taking on slightly colder air, thus gives a slightly denser a/f mixture.

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
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'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


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post #3 of 8 (permalink) Old 06-19-2013, 08:35 AM Thread Starter
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I kinda thought I'd see an increase but oh well it's not like its sucking all my gas out haha

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post #4 of 8 (permalink) Old 06-19-2013, 08:56 AM
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Honestly, there is a slight increase of power, and slight decrease of fuel. Only way around that is to have your car tuned to run leaner.

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
Future - KSport Kontrol Pro Coilovers, 10% Tint, FMIC spray
538whp/501wtq @38 psi on meth and 93 oct on stock ish motor


06 EVO IX MR/SE - Sold
Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


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post #5 of 8 (permalink) Old 06-19-2013, 09:57 AM
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But, "ECM" should read HO2s and compensate. Gas pedal depression % should be less therefore giving you better mpg. But unless you took readings before and after you will never know. Usually people get less mpg at first because they enjoy the new found engine sound and tend to step on it a bit more. If you were to take a long trip bet your mpg would be better.

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post #6 of 8 (permalink) Old 06-19-2013, 10:45 AM Thread Starter
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haha you are right I've been giving it a little more just to hear it but just driving on the interstate earlier I did notice it go back up a couple of miles per

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post #7 of 8 (permalink) Old 06-19-2013, 11:16 AM
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post #8 of 8 (permalink) Old 09-13-2013, 05:47 PM
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Quote:
Originally Posted by Coby7 View Post
But, "ECM" should read HO2s and compensate. Gas pedal depression % should be less therefore giving you better mpg. But unless you took readings before and after you will never know. Usually people get less mpg at first because they enjoy the new found engine sound and tend to step on it a bit more. If you were to take a long trip bet your mpg would be better.
agreed, your car with that "intake" is having your 02 sensors (front is an a/f sensor, rear is cat effieciency 02) add more fuel in the fuel trim with your PCM. Your MAF sensor is reading more mass amounts of air and needs to stick between 12.1-18:1 a/f ratio (this ratio is called wideband). Basically, 12 would be rich condition, 18 is lean, 14.7 is stoichiometric (known as balanced). To the :1 is the amount of air to the amount of fuel. With you adding your CAI, the ratio will be slightly richer, since the denser air, but we don't have speed density meters, so in other words, it will increase more power from the power stroke from the engine cycle, but more fuel atomization is needed in the combustion chamber to balance it out. That's the technician explanation

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