RPM Question
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From: 310 SoCal
Originally Posted by 2slow,Oct 9 2007, 06:40 PM
What's wrong with that? The site says you should hit 36.9mph in 1st, 56.5mph in 2nd, and 78mph in 3rd. Sounds pretty close to me 
MY01 is at about 91 mph at the end of 3rd..
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From: Hartselle, AL
Originally Posted by JHooby,Oct 11 2007, 04:54 AM
MY01 is at about 91 mph at the end of 3rd..
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From: Sterling, VA
As far as the accuracy of the gear calculator goes... I first learned about it when I saw XViper reference it in one of his posts. So I figure, if it's good enough for X, it's good enough for me 
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From: UCF Knights!
Originally Posted by overst33r,Oct 10 2007, 01:40 PM
The best gas mileage is achieve between 35-55mph. Basically cruising at the lowest RPM in the highest gear without lugging the engine. Air resistance increases with the square of the velocity, so if you double your speed you have ~4 times the air resistance fighting you...
Basically picturing the right side of a parabola with the x axis being time, the air resistance increases very quickly...
His statement applies only to low speeds (<~30mph) Some cars cannot cruise at this speed without lugging the engine, therefore having to be in let's say 4th instead of top gear (5th) You get worse MPG in 4th at 30mph than in 5th at 35mph, see what I am getting at?
Basically picturing the right side of a parabola with the x axis being time, the air resistance increases very quickly...
His statement applies only to low speeds (<~30mph) Some cars cannot cruise at this speed without lugging the engine, therefore having to be in let's say 4th instead of top gear (5th) You get worse MPG in 4th at 30mph than in 5th at 35mph, see what I am getting at?
Dyno a bone stock AP1 and do a wideband check on it...you'll see the AFR's lean out to almost 14:1 (in some cases slightly higher) in the 1000 rpm range just before VTEC.
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From: Wylie, TX
Originally Posted by JHooby,Oct 11 2007, 04:54 AM
MY01 is at about 91 mph at the end of 3rd..
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From: Palm Harbor, FL
Originally Posted by wildcardtrd,Oct 11 2007, 04:30 AM
You're not taking into account the tuning of the engine...between 80 and 85 the fuel map is leaner in the 85-100% engine load vs rpm cells, so the car gets better gas mileage irregardless of air resistance.
Dyno a bone stock AP1 and do a wideband check on it...you'll see the AFR's lean out to almost 14:1 (in some cases slightly higher) in the 1000 rpm range just before VTEC.
Dyno a bone stock AP1 and do a wideband check on it...you'll see the AFR's lean out to almost 14:1 (in some cases slightly higher) in the 1000 rpm range just before VTEC.
so the car gets better gas mileage irregardless of air resistance.
No. I think you are confusing engine efficiency and car efficiency (which takes into account air resistance)
The ENGINE is more efficient, NOT the car.
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