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Topic Started: Feb 2 2010, 10:30 PM (720 Views)
orlando'smetro
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Elite Member
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I have been thinking about changing some parts on my daughter's geo and I was wondering if putting a different coil and air filter would really make a difference in performance? I know about cool air intakes helping sports cars perform better but I don't know about many options for geos I just wanted to know from someone with knowledge about this subject. Also I have seen some spark plugs that seem to give a stronger spark but I don't know if it will hurt the engine in anyway. :hmm
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Johnny Mullet
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Fear the Mullet

Most of use use the warm air intake for better fuel mileage. Most of us do this by removing the snorkel like so............
Posted Image

Bigger coils and multi-post plugs really do nothing for these cars in my experience. All the spark plug has to do is ignite the fuel in the combustion chamber. A bigger bang is not made by more powerful spark.
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chads4dr


The factory coil is already very good (its made by mitsubishi....well at least mine is, it has their symbol on it) the only improvement you can do that is noticeable is with the addition of a multispark discharge system (MSD, Accel, etc) instead of one spark it discharges up to 6? BUT you probably wont pick up any ponies, if anything it will only give you better throttle response and maybe a little cleaner burn.

As for the air filter thats a big debate: http://geometroforum.com/topic/2805028/1/ Everyone has an opinion about them, I myself used it for a while but noticed no difference other than more noise.

Spark plugs: Just use the recommended NGK plugs, they will give you the best spark, long life, and good price. The more expensive platinum and iridiums just last longer, they dont give more power! Also dont get swept up into the Platinum +2 +4 +10 :P Hype, no benefit to them, just headaches!

Edited by chads4dr, Feb 2 2010, 11:00 PM.
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mwebb
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FOG

the air filter should be kept stock
the famous brand of air filters do nothing to improve anything and
they do not filter as well so there is more likely-hood of damaging the engine due to ingested dirt

as per testing by IATn and the US government.
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i remove my snorkel in the cold weather too ...
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Posted Image
right click on image - select view image - click 2x to expand image

see spark waveforms
shown are two cylinders with leaking valves - the waveform is not enhanced by
any of the alleged super duper plugs none are as good as the OEM stock spark plugs

stick with stock NGK OEM plugs ,
never and i mean never use Bosch Platinum +4 spark plugs or you will feel the pain i try to save people from
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Bad Bent
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Facetious Educated Donkey

Spark plugs and air filters spark some depate on the forum. Even I won't go the Pulstar $25 plugs. Try surfing: www.sparkplugs.com/sparkplug411

Your "options" on air intakes are a few. Johnny recommends the best for mileage. I still use my cold dense air that comes in from the front bumper and if you want you can add an after market cone filter to the air cleaner and still get engine compartment warm air. Then again click on MGB-Cold-Air-Induction for some suggestions on cold air induction mods. :news
Edited by Bad Bent, Feb 2 2010, 11:34 PM.
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mwebb
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FOG

http://www.fueleconomy.gov/feg/pdfs/Air_Filter_Effects_02_26_2009.pdf

if you run out of bathroom reading material , and you have an interest in learning about air filters and testing air filters
print this ,
page 37 has the conclusions


conclusions on page 37
4.1 CONCLUSIONS
The goal of this study was to explore the effects of a clogged air filter on the fuel economy of vehicles operating over prescribed test cycles. Three newer vehicles (a 2007 Buick Lucerne, a 2006 Dodge Charger, and a 2003 Toyota Camry) and an older carbureted vehicle were tested.
Results show that clogging the air filter has no significant effect on the fuel economy of the newer vehicles (all fuel injected with closed-loop control and one equipped with MDS). The engine control systems were able to maintain the desired AFR regardless of intake restrictions, and therefore fuel consumption was not increased. The carbureted engine did show a decrease in fuel economy with increasing restriction. However, the level of restriction required to cause a substantial (10–15%) decrease in fuel economy (such as that cited in the literature3,4) was so severe that the vehicle was almost undrivable. Acceleration performance on all vehicles was improved with a clean air filter.
Once it was determined how severe the restriction had to be to affect the carbureted vehicle fuel economy, the 2007 Buick Lucerne was retested in a similar manner. We were not able to achieve the level of restriction that was achieved with the 1972 Pontiac with the Lucerne. The Lucerne’s air filter box would not hold the filter in place under such severe conditions. (It is believed that this testing exceeded the design limits of the air box.) Tests were conducted at a lower restriction level (although still considerably more severe than the initial clogged filter testing), allowing the air filter to stay seated in the air box, and no significant change was observed in the Lucerne’s fuel economy or the AFR over the HFET cycle.
Closed-loop control in modern fuel injected vehicle applications is sophisticated enough to keep a clogged air filter from affecting the vehicle fuel economy. However for older, open-loop, carbureted vehicles, a clogged air filter can affect the fuel economy. For the vehicle tested, the fuel economy with a new air filter improved as much as 14% over that with a severely clogged filter (in which the filter was so clogged that drivability was impacted). Under a more typical state of clog, the improvement with a new filter ranged from 2 to 6%.
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