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There's a lot more to making a car fast than horsepower. There are Civics out there with 200-something horsepower beating on Mustang GT's.
There is a reason I choose 255 hp.
It has to do with power to weight ratios and my goal.
The power to weight ratio of a stock Gt -11.50 (3450 lbs/300hp)
The power to weight ratio of a stock v6 -15.71 (3300 lbs/210hp)
The torque to weight ratio of a stock Gt -10.78 (3450 lbs/320 lbs torque )
The torque to weight ratio of a stock v6 -13.75 (3300 lbs/240 lbs torque )
those are the stock numbers.
I have a goal to take off 300lbs of the v6.
If you put a weight of 3000lbs and use the 255hp goal the new numbers look like this...
v6 (3000 lbs/255hp)=11.76 vs the GT ratio of 11.50
assuming that the torque numbers go up the same amount 45 foot lbs then ..
v6 (3000 lbs/285 lbs torque)=10.52 vs the GTs torque to weight ratio of 10.78
45 hp and 45 foot lbs of torque along with 300 less in the v6 curb weight should put the v6 at stock GT range . But the v6 would be 450 lbs lighter overall and would beat a stock gt with any additional add ons that were put on in the prosses to reduce the curb weight . such as the aluminum DS . and dose not take into account better gears or the potential for more cornering Gs due to the reduced curb weight.
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As far as the underdrive pully discussion goes .the way I think about it is the faster a engine revs up the more benefit the hp gain will be because . not only dose the underdrive pulley slow down every accessory but it slows down the inertia of every pully on the belt drive allowing for faster rev due to less resistance. (much the way a aluminum drive shaft ,or flywheel reduces rotating inertia weight.)
so in conclusion . The underdrive pulley is a mod that gives more benefit the more hp a car has because it is not a mod that is actually part of the engine . But part of rotating mass. unlike other engine mods the benefit is always there no mater what tune or mod.
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Last edited by clintster77; 02-28-2009 at 06:12 PM.
heres wat u do... H/C/I (http://www.supersixmotorsports.com/p...1HeadsCams.pdf) in combination with a Dyno Tune. An upgraded throttle body and underdrive pullies. Long tube Headers and upgraded dual exhaust with high flow cats. not sure where all that will cost or put u but im pretty sure thats the best that can be done in hopes of achieving your goal.
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heres wat u do... H/C/I (http://www.supersixmotorsports.com/p...1HeadsCams.pdf) in combination with a Dyno Tune. An upgraded throttle body and underdrive pullies. Long tube Headers and upgraded dual exhaust with high flow cats. not sure where all that will cost or put u but im pretty sure thats the best that can be done in hopes of achieving your goal.
wow thats crazy .I was just looking at those heads about 2 minutes ago.
they look like they would do the trick . three angle valve heads port and polished for $1050 bucks with a $300 core $750 . not bad . I wish I hade a close friend who was a head port and polish expert . I have even thought about doing the port and polish myself but not the 3 angle valve job
by the way, you say you know the difference between rwhp and crank HP, yet when you look at you DYNO sheet for the numbers for the pullies you say the crank HP is less. DYNO sheets are RWHP which is less that crank. You are mixing numbers up left and right.
by the way, you say you know the difference between rwhp and crank HP, yet when you look at you DYNO sheet for the numbers for the pullies you say the crank HP is less. DYNO sheets are RWHP which is less that crank. You are mixing numbers up left and right.
Also, losing 300 lbs is going to be costly!
I may of mixed it up but just from feed back overload
I cant find what you are refering to . crank hp is more than rwhp but some of the dyno sheets I have been looking at have been in rwhp . 20 rwhp is better than 20 crank hp . I dont think I have ran across a conversion cart for one to the other. IF for some strange reason I came up with 45-50 rwhp over stock I would be really happy as that would be really fast compared to 45-50 crank hp .
But for the sake of the power to weight ratio theory I am using crank hp because I have the stock GT and v6 numbers to start with.
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