Not sure I follow this.
You are saying you rebuilt the engine and got a seat-of-the-pants impression
that you had gained 10-15% in performance (using the same tires before and
after the rebuilt, I presume).
Then, you changed to an oversize tire and lost the performance you had
gained, so you are right back where you started seat-of-the-pants wise?
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A while back my stock engine was rebuilt (stock 2.1L to a Eurocars 2.2L)
After the rebuild my "Seat of the Pants" conclusion was that I had
gained 10-15% in Engine performance (Acceleration & Top End MPH).
Now to the topic ..... Engine Performance vs Tire Size
Since then I've had the opportunity to try two different tire sizes on
the same vehicle. Since I was planning on going to a large than stock
tire, I anticipated sacrificing a little power / performance.
But it seems to be more than a little.
Tire Details:
Size / Width / Diameter / Rev per Mile
Original Owner Tires
27X8.5R14 / 8.6" / 26.5" / 795 ... Dunlop Rover - 10-15% Engine Power
Increase (as noted above)
First Replacement Tire Set
215/65R15 / 8.7" / 26.1" / 818 ... Michelin - No Change Engine Power
Increase
Second Replacement Tire Set ... Current Tires
215/75R15 / 8.5" / 27.7" / 755 ... Michelin LTX 0% Engine Power
Increase
Does it make sense that I'd loose 10-15% in performance by increasing
the tire diameter 1.2"?
If that's the case ..... I might consider changing to a tire closer to
the OE Tire diameter.
Larry
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