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Go to the drag strip and race your car as many times as you can. Then go to http://www.speedworldmotorplex.com/calc.htm and put in your info. I have found that the tarp speed method is more accurate, than the 1/4 mile method b/c of wheel spin etc. this will not be an exact hp but it will be fairly close just as close if not closer than the gtech.
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the only problem i see with this is the formula is based on rwd drivtrain.....25% drivtrain loss for rwd and 11-15% for fwd....good enough to give a reading if thats what your after....youll just have to do a lil more math to get the proper readings....ie mult hp fig givin by hp calc....mult by 24%....that gives you bhp.....then mult by .11 that should give you your whp as you being fwd...