Lower mileage after upgrade
#21
1st, 1k on was stock and averaged 38 or so.
Stage 1 & rush 2" dynoed, at 1k service, for 2yrs avg. 41, 39-43 usually.
At 7k, started running stronger and got better mileage.
March this yr, put in 26H cams only at 16k and re-dynoed.
Put on 500-600 miles while the Ind weather was in the 50's-60's and avg 38.5mpg.
Now it has warmed up above 80 for the last 2 days (and last 3 tanks), I got 40, then 42 riding two-up.
Today I put 146 on her solo & all highway, using 6th at 60-65mph, I got a little over 45mpg.
This is the best I have ever got on her.
Before cams If I used 6th gear mpg's went down below 40, the motor felt and sounded as going uphill (laboring)..
Best mpg's (pre Cams) always was in 5th staying between 50-55mph,
Now (with cams) she accelerates better in 6th at 65 than it used to in 5th at 55. Really makes 6th gear usable at 60 or more
So it does seem that riding in the colder weather does make close to a 10% decrease in mileage.
Stage 1 did help, but a few K's on her helps also.
If the mileage stays up then the cams didn't hurt...maybe helped mileage.
Does have a lot better power when I roll on it which if at worst is better.
Stage 1 & rush 2" dynoed, at 1k service, for 2yrs avg. 41, 39-43 usually.
At 7k, started running stronger and got better mileage.
March this yr, put in 26H cams only at 16k and re-dynoed.
Put on 500-600 miles while the Ind weather was in the 50's-60's and avg 38.5mpg.
Now it has warmed up above 80 for the last 2 days (and last 3 tanks), I got 40, then 42 riding two-up.
Today I put 146 on her solo & all highway, using 6th at 60-65mph, I got a little over 45mpg.
This is the best I have ever got on her.
Before cams If I used 6th gear mpg's went down below 40, the motor felt and sounded as going uphill (laboring)..
Best mpg's (pre Cams) always was in 5th staying between 50-55mph,
Now (with cams) she accelerates better in 6th at 65 than it used to in 5th at 55. Really makes 6th gear usable at 60 or more
So it does seem that riding in the colder weather does make close to a 10% decrease in mileage.
Stage 1 did help, but a few K's on her helps also.
If the mileage stays up then the cams didn't hurt...maybe helped mileage.
Does have a lot better power when I roll on it which if at worst is better.
Last edited by oct1949; 05-21-2009 at 11:43 PM. Reason: added
#23
Quick couple things with colder temps.
1. Colder engine at start up so in a different cold start map and is richer then a warm day start. Also takes longer for engine to warm up and stays in cold enrichment longer.
2. Cold air is denser so more air volume at a given MAP pressure so more fuel is added.
Unless of course your carbed. Then different things are going on.
1. Colder engine at start up so in a different cold start map and is richer then a warm day start. Also takes longer for engine to warm up and stays in cold enrichment longer.
2. Cold air is denser so more air volume at a given MAP pressure so more fuel is added.
Unless of course your carbed. Then different things are going on.
Randy
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