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Old 02-18-2014, 04:55 PM   #71
jwindbigler
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Yes there is a reduction of life but with a slight increase in performance, I think I went ahead and gaped mine about .057 just to be on the safe side. Spark plugs are cheap though
Very true. At least these things are easy to get to. Unlike an LT1 firebird. Want to talk about a PITA to get to the back two plugs.
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Old 02-18-2014, 05:53 PM   #72
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The wheels had to affected the MPG, I'm sure my SES 17's are not helping. I only get 29-30 mpg in the city on the average with 31 being the highest. The highway is 34-35 mpg on the average. As for spark plugs, I tried the AR103's, no gain what so ever and tried gaps from .045 up .060.
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Old 02-18-2014, 06:57 PM   #73
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Plugs on a LT1? How about the plugs and the optispark had two go out on me and just dropped the motor to change the plugs. I know what you mean bro!
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Old 02-19-2014, 02:42 AM   #74
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In regards to the idea that wheel weight specifically is a significant factor, some reasonably reliable (specific testing) information can be found here and here. While wheel weight can play a relatively significant performance role, it does not so much for fuel economy. Especially for steady state (highway) driving....Which is very telling, when this statement is taken into account:
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I recently did a freeway trip to Grand Rapids. About a 300 mile round trip, and normally I would get about 30-32mpg, and this last time I got 26.
Overall, it's rather unlikely that any one of the previously mentioned maintenance items had sudden-onset-end-of-life-performance-degradation with <60k miles on the odometer just happening to coincide with winter. So any gains you see from them now, would just as likely also have had a similar effect a few months ago before your fuel economy changed. If there are noticeable gains from any of this, great, but it would still have little to do with the reason this thread was actually started...So I would recommend not spending much time/effort (or money) chasing phantom problems just yet, nor have any real expectations of a noticeable improvement from doing so.

Again, aside from any driving style changes, all signs point almost exclusively to environmental factors related to winter weather, the assotiated winter tire construction and rubber compound, and a ~0.5mpg loss due to tire size throwing your calculations off. This is simply the reality of living with northern (MI) winters, and is something that southern folks (TX and FL) must be excused for not being familiar with the severity of effect it has.

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However the thing im suspecting is more the cold weather, and snow tires than anything else. I cant control the weather, and dont want to lose the stability of the new tires, so Im stuck till spring.
Occam's Razor.
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Old 02-19-2014, 08:06 AM   #75
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Plugs on a LT1? How about the plugs and the optispark had two go out on me and just dropped the motor to change the plugs. I know what you mean bro!
LT1 - 1993-1997 camaro/trans am V8. Specifically I worked on a 1996.

What's the optispark in?
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Old 02-19-2014, 08:07 AM   #76
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Quote:
Originally Posted by Driven5 View Post
In regards to the idea that wheel weight specifically is a significant factor, some reasonably reliable (specific testing) information can be found here and here. While wheel weight can play a relatively significant performance role, it does not so much for fuel economy. Especially for steady state (highway) driving....Which is very telling, when this statement is taken into account:


Overall, it's rather unlikely that any one of the previously mentioned maintenance items had sudden-onset-end-of-life-performance-degradation with <60k miles on the odometer just happening to coincide with winter. So any gains you see from them now, would just as likely also have had a similar effect a few months ago before your fuel economy changed. If there are noticeable gains from any of this, great, but it would still have little to do with the reason this thread was actually started...So I would recommend not spending much time/effort (or money) chasing phantom problems just yet, nor have any real expectations of a noticeable improvement from doing so.

Again, aside from any driving style changes, all signs point almost exclusively to environmental factors related to winter weather, the assotiated winter tire construction and rubber compound, and a ~0.5mpg loss due to tire size throwing your calculations off. This is simply the reality of living with northern (MI) winters, and is something that southern folks (TX and FL) must be excused for not being familiar with the severity of effect it has.

Occam's Razor.
At almost 60k, isn't it about time to change the plugs? I bought it from a dealer at 38k
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Old 02-19-2014, 08:46 AM   #77
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At almost 60k, isn't it about time to change the plugs? I bought it from a dealer at 38k
Yes it is. I think what he is saying is that it wouldn't cause a sudden decrease in mpgs. It would have been gradual over time.
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Old 02-19-2014, 08:50 AM   #78
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LT1 - 1993-1997 camaro/trans am V8. Specifically I worked on a 1996.

What's the optispark in?
There in all LT1 motors, its their infrared laser distributor, about 1000$ to replace and requires pulling the radiator to get to it easily. There real sensitive too, a drop of water can kill one.

I owned a 94 on a lot of nitrous but damn the car was fun. I actually traded it in for my Focus.



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Old 02-19-2014, 08:51 AM   #79
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Change your plugs too man, that's enough miles to justify the 6$ it will cost.
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Old 02-19-2014, 09:26 AM   #80
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Change your plugs too man, that's enough miles to justify the 6$ it will cost.
This^
I cannot stress this enough! It is such a cheap and quick maintenance. Takes 10 minutes and can only help!
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