Mods- Where should I start? 2000 SSEI - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-15-2012, 01:31 PM   #1
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Default Mods- Where should I start? 2000 SSEI

I would like to add some mods to my Bonny (supercharged) to get better MPG'*.
My first plan was to add a CAI system (JMB performance) but heard that it really didnt make that much diff on the MPG'* only makes the supercharger sound good. Im not trying to run a 6sec 0-60mph run.
I'm looking for gaining 3-4 mpg'* for cruising the highway everyday.
So Im not to sure where to go from here. Ign coils, plugs/wires? Exhaust? Anyone done one thing and seen any improvements in gas mileage?
I would like to stay away from tearing the motor apart for lifters and such. Under size pulley on the charger seems to be a waste for me since it will just make you mash the gas more.

Any suggestions or past examples out there?

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Old 03-15-2012, 01:43 PM   #2
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There aren't any mods I know of to improve gas mileage, only regular maintenance and good driving habits. Fresh plugs, wires and air filter, regular oil changes and stuff like that. Use cruise control to maintain steady speed, and go easy on the acceleration. Monitor your air pressures, and you may want to bump them up 2 to 4 psi for better highway mileage. Don't increase pressure too much or your tires will wear unevenly.
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Old 03-15-2012, 03:32 PM   #3
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Whats a good air pressure to stick to...??? 51 is max psi..shoul i go more or less or maintain right at 51..??
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Old 03-15-2012, 05:48 PM   #4
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I was told in Auto school, that just 2-3 pounds under max is fine. If you fill your tires cold to max, then after you start driving, the pressure will build up over max and cause uneven wear. That was back in 1994.
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Old 03-15-2012, 07:28 PM   #5
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every car is different, i usually increase the pressure some and watch the wear and adjust from there. most of my previous vehicles the sticker said 35 and i could get away with 38 without uneven wear, which is good for some mileage. usually drop it back to 35-36 for the winter. now that i have a readout of tire pressure it doesnt go up hardly at all, the sticker says 30 and i put it at 30 and they most the time dont even get to 32.
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Old 03-15-2012, 07:34 PM   #6
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I run about 36 psi cold. Works out nicely.

I know I told you some things you can do to increase MPGs in the other thread. All had to with porting/polishing things.
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