performance and econonmy tuning question
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Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
performance and econonmy tuning question
when tuning a vehicle, such as getting the most spark and fuel out of it without detonation, is this also good for fuel economy? or is their a different way to go at it to get the fuel milage and performance?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Keep the engine vacuum as high as possible, while maintaining sharp throttle response, getting away with the least amount of fuel and timing possible.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
so for economy, i want to remove spark and fuel?
if i do too much will i also, see detonation?
so for economy, i want to remove spark and fuel?
if i do too much will i also, see detonation?
Your engine may very well want more timing than it does now, due to the leaner A/F mixture. What I mean by the minimum, is run as little timing possible to have good response, good part throttle power, etc.
I guess what I am saying is that if 48* gives the same response and power as 42*, you are actually hurting MPG beingat 48* over 42*
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Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
should i start with removing fueling or spark first?
and do u think its an idea to have the lower rpms set for economy, and above a certain rpm, change it for performance?
and do u think its an idea to have the lower rpms set for economy, and above a certain rpm, change it for performance?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
I would pull a little fuel at cruise, read the plugs, then advance your timing a little, read the plugs, then go at it a little more.
TOO LEAN + TOO MUCH TIMING=MELTDOWN
Your best bet is to work off of MAP and TPS, not RPM. I can run 2,500+ rpm in 3rd gear with a light load or I can run 3,000+ WOT. Its not an RPM thing, but rather an engine load thing.
TOO LEAN + TOO MUCH TIMING=MELTDOWN
Your best bet is to work off of MAP and TPS, not RPM. I can run 2,500+ rpm in 3rd gear with a light load or I can run 3,000+ WOT. Its not an RPM thing, but rather an engine load thing.
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Car: '02 Z06
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Transmission: T56
Axle/Gears: Stock IRS
hmm this is starting to cofnuse me. lol i guess i understand that i need to pull fueling. but to add timing?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
hmm this is starting to cofnuse me. lol i guess i understand that i need to pull fueling. but to add timing?
hmm this is starting to cofnuse me. lol i guess i understand that i need to pull fueling. but to add timing?
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Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Originally posted by TraviZ
so for economy, i want to remove spark and fuel?
if i do too much will i also, see detonation?
so for economy, i want to remove spark and fuel?
if i do too much will i also, see detonation?
You also need to watch the coolant temp., oil temp is even better for seeing if you're adding too much heat into the system, via being lean, and advancing the timing.
Detonation?, not so much in cruise, unless you really miss the tune. BUT, you can easily get to having tip-in preignition. Remember the K/S is deaf to preignition.
So while you might run alot of timing, in the light load areas, you want to ramp it out quickly, as you get into the higher loads. That and Burst knock retard is your friend.
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Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
think maybe i can leave fueling alone then in the cruise areas like stock, and only adjust fueling in the top end? and max my timing out throughout the whole rpm range without detonation?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
think maybe i can leave fueling alone then in the cruise areas like stock, and only adjust fueling in the top end? and max my timing out throughout the whole rpm range without detonation?
think maybe i can leave fueling alone then in the cruise areas like stock, and only adjust fueling in the top end? and max my timing out throughout the whole rpm range without detonation?
MAXING the timing out is not benificial and should be avoided. While you may not be encountering detonation, you are putting NEGATIVE work on the crank by lighting off the mixture too early.
MBT
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Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
im sorry im not quite understanding what your trying to say? from a stock timing map, should I be taking out timing for milage?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
im sorry im not quite understanding what your trying to say? from a stock timing map, should I be taking out timing for milage?
im sorry im not quite understanding what your trying to say? from a stock timing map, should I be taking out timing for milage?
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Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
so what if i were to leave it where its at and it runs fine? should i just pull some fuel out as long as i still feel that it runs fine and doesnt hesitate or studder?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
so what if i were to leave it where its at and it runs fine? should i just pull some fuel out as long as i still feel that it runs fine and doesnt hesitate or studder?
so what if i were to leave it where its at and it runs fine? should i just pull some fuel out as long as i still feel that it runs fine and doesnt hesitate or studder?
You will find that your combo likes about 44-48* of timing and about 15.5:1 a/f ratio at lower maps.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
so pull fuel till it feels 'lame' (lol) then add timing to make it feel good again?
so pull fuel till it feels 'lame' (lol) then add timing to make it feel good again?
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally posted by TraviZ
how can i tell when im going too far?
how can i tell when im going too far?
Here is an example, don't use as your own, if you do, I am not responsible for what happens!!!
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