Del sol rpm
#5
Premium Member
Re: Del sol rpm
And depends on final gear ratio...
The way it works is you have engine RPM x 5th gear ratio x differential ratio x circumference of your drive tire, which is 2(Pi)r, so you need the radius of your wheel and tire. Ideally the true radius while the tire is at pressure and loaded with the vehicle weight.
And don't forget unit conversion; inches to miles, minutes to hours, etc.
The way it works is you have engine RPM x 5th gear ratio x differential ratio x circumference of your drive tire, which is 2(Pi)r, so you need the radius of your wheel and tire. Ideally the true radius while the tire is at pressure and loaded with the vehicle weight.
And don't forget unit conversion; inches to miles, minutes to hours, etc.
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#8
I like the tuna here
Re: Del sol rpm
And depends on final gear ratio...
The way it works is you have engine RPM x 5th gear ratio x differential ratio x circumference of your drive tire, which is 2(Pi)r, so you need the radius of your wheel and tire. Ideally the true radius while the tire is at pressure and loaded with the vehicle weight.
And don't forget unit conversion; inches to miles, minutes to hours, etc.
The way it works is you have engine RPM x 5th gear ratio x differential ratio x circumference of your drive tire, which is 2(Pi)r, so you need the radius of your wheel and tire. Ideally the true radius while the tire is at pressure and loaded with the vehicle weight.
And don't forget unit conversion; inches to miles, minutes to hours, etc.
It says that he should be around 3800 rpm at 80, but his speedometer could be off, his tach could be off, or someone might have swapped his engine/transmission...
OP, do you have the stock single cam engine or a dual cam swap?
#9
Re: Del sol rpm
If you are indeed running 15" wheels, it will be off because those wheels are a bit larger than what was on the car from factory; 14" You may not think it to be that much different, but yeah.
#10
#11
#12
#13
Re: Del sol rpm
The difference in stock rotation vs what he has equipped is pretty near a wash in terms of revolutions/mile. There's more math to go into figuring that part out and breaking down to where he should be on the tach, but my brain hurts today.
https://tiresize.com/calculator/
With about a 300-500 RPM difference where he is vs where he "should" be; 1- I wouldn't sweat that in the least as it is actually probably on the nose since i'm in a D15B7 with a stock trans, stock wheels/tires, and at 3300 RPM @ 80mph and he's got the shorter gears so it'll be higher.. 2- Si trans has a history of high rpm at freeway speeds anyways.
#14
I like the tuna here
Re: Del sol rpm
Overall diameter will not change as rim size does. Or more accurately, it does not HAVE to change. By getting different widths/sidewall heights, you can increase the overall diameter to offset changing to a smaller wheel, or decrease the overall diameter to offset a larger wheel. Overall diameter is the only thing that matters.
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