Performance Air Filter for my 97 Bonneville - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 08-08-2004, 12:05 PM   #11
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I haven't done any long trips to really figure out the gain I got. And usually in the city I'm not friendly to the gas pedal if ya know what I mean.
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Old 08-08-2004, 01:10 PM   #12
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I'm getting 29-30 mpg with my mods. Virtually every mod in my sig has a positive effect on MPG'*. Things start to change for the worse when you start getting into the valvetrain, but not enough to cancel out your previous work unless you get extreme.

I think a well-tuned Series 1 is capable of slightly better mileage than a Series 2, simply because the hp and tq peak at a lower rpm, so the engine isn't working as hard cruising in OD.

A good intake on a non-supercharged car, using every trick we know for shielding from engine heat, laminar flow, good filtration and IAT location may net you 2 mpg. Let 'er breathe!
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Old 08-08-2004, 01:27 PM   #13
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I bought this intake off of ebay, No problems with it at all.
http://cgi.ebay.com/ebaymotors/ws/eB...category=38634
its also in your price range. cost me 38 us.
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Old 08-08-2004, 01:27 PM   #14
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If you get less then 30 MPG freeway on an N/A car that'* had a tuneup recently, and a free flowing intake, you're driving too fast!

MPG progressively falls the faster you go above say 75-80 on my car. @ 100+ i burned 1/8th of a tank in about oh 5 minutes...
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Old 08-08-2004, 04:33 PM   #15
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Quote:
Originally Posted by BonneMeMN
If you get less then 30 MPG freeway on an N/A car that'* had a tuneup recently, and a free flowing intake, you're driving too fast!

MPG progressively falls the faster you go above say 75-80 on my car. @ 100+ i burned 1/8th of a tank in about oh 5 minutes...
yeah, but what were your RPMs at 100mph?
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Old 08-08-2004, 07:13 PM   #16
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Quote:
Originally Posted by macho_mike21

yeah, but what were your RPMs at 100mph?
MPG is NOT dependant on RPMs. Throttle position is what makes MPG. The car requires the same amount of fuel at a certain throttle percentage. The more open it is, the more fuel you need. You need more throttle to maintain 2000 RPMS @ 70 mph, compared to 2000 RPM @ 10 mph.

The less you accelerate, the best your mileage. That'* why freeways are so good for milage, because you're generally just cruising.

RPMS @ 100? Umm probably 4000+. It sounds good on an open intake and/or exhaust....
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Old 08-08-2004, 10:25 PM   #17
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holy crap, 30mpg??? I used to calculate the mpg when my mom drove my bonne [she has a featherweight foot], and I never got past 19.6 mpg. The car has 7 yr old plugs, and original plugs.. and a junkyard coil and ICM, so i'm guessing that is why.. but if I can get that car to have 30+mpg, i'll be getting better gas mileage than my mom'* little 100hp beetle.. .


-justin
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Old 08-08-2004, 10:48 PM   #18
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Full tuneup including O2 sensor. That'* the place to start, THEN do the intake. My 30mpg was on a long freeway trip with the cruise set at 70-75mph.
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Old 08-08-2004, 10:48 PM   #19
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I managed to get 32 MPG average on our 2000 SSEi on a 150 mile trip yesterday. It'* possible.. Oh, and that car is 100% stock too.
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Old 08-09-2004, 01:38 PM   #20
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I just did a trip from Kansas City to Joplin this weekend, aprx 160 miles each way.
At 80 mph with air on and having to slow down and back up for traffic I pulled out 33mpg.
Average combo around town and highway is 24.
This is with 105,000 miles on it, basically stock except the gutted air box.
Tuned this spring.
I don't think it'* doing bad at all.
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