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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 09-30-2000, 10:07 PM
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MSD question

I'm a little unhappy with the mileage of my TJ. it seems to have gone to hell since i got the larger tires. so the question is, is any imrpovement seen with the addition of a MSD? and if so, how much? just wondering

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post #2 of (permalink) Old 09-30-2000, 10:27 PM
 
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Re: MSD question

This may be stupid, but are you fingering in the larger tires and the greater distance they cover with each turn of the wheel. You probably have already have taken this in to in acount.

My Jeep is a work in progress, Happy Trails
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post #3 of (permalink) Old 09-30-2000, 11:04 PM
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Re: MSD question

the short answer is yes, but my mileage still seems kinda low.

frank

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post #4 of (permalink) Old 10-01-2000, 11:45 AM
 
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Re: MSD question

Ya know that not only is the speedometer affected, but so is the odometer. It will read less miles than you've actually gone...

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post #5 of (permalink) Old 10-01-2000, 02:14 PM
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Re: MSD question

Ok, time for the long answer

Yes, I know the odometer is off also. i figure its off 11.9%. I had 215 75 R15's and i went to 31's. the i used 27.7" as the nominal diameter of the 215's. the circumfrences are 87.0" and 97.4". I took the difference in the two and divided it by the origonal size. Even after i calculate in new tire size differnce, i'm still down almost 2mpg. it might not seem much, but i didn't have that great of mileage before. this puts my average around 15. i'm not happy with this and was looking for any improvement.

Will a MSD help, and if so, how much?

frank

post #6 of (permalink) Old 10-01-2000, 10:36 PM
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Re: MSD question

The addition of bigger tires also comes with the need for more energy to turn them. In fact, may jeepers will change the cam shaft in order to regain some of the lost power. Hence, the reduction in your gas mileage.

Good Wheel'n
Kriss

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