Quote:
Originally Posted by XutvJet
It really depends on where and how this 47whp is gained. Is it 47whp across the entire powerband (ie. 4500rpms to redline) or is 47whp across just a small portion of the powerband or not even in the powerband?
47whp across the entire powerband could get you .4-.5 seconds and 4-5mph in the 1/4 mile assuming a 3,000-4,000lb car and appropriate gearing.
47whp over the span of 1,000rpm or less of the powerband won't result in much of a measurable gain in the 1/4 mile.
47whp gained below 4,500rpms won't do much good at all as the only time you're accelerating in that area in the 1/4 mile is 1st gear. In a 6MT, you'll be launching at 3,500rpms+ and will sail through the "gain" in a fraction of a second.
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Also heavily dependant on how fast and powerful the car is to begin with. All else being equal, a mid 14 second car will see more of a reduction in ET from those 47 whp than a mid 11 second car. You won’t go from 11.50’s to 11.00’s on 47 whp, even if you get it right off idle to redline.