New "pathetic" track times after 3.73's !!HELP!!

[Dark_5.0]

Last night I went to the track it was really humid outside. I seen one of the guys that I work with as soon as I pulled through the gate I went to talk to him for a minute and he had out his altitude gauge and it said that the altitude was at "6400ft"

My first run I had 20 lbs of air in my Nittos and I spun out really bad all the way through third and ran a 16.4 @90mph

My second run I launch at a lower rpm and I ran a 15.9 @89.

By this time I was pissed and dropped the air pressure down to about 14 lbs and launched at idle started spinning at the top of 1st gear spunn all the way through second and chirped third and ran a 15.4 @90

With 3.73's with 2.73's
60ft 2.17 2.14
1/8 9.81 @73 9.63 @72
1/4 15.4 @90 15.2 @89

With the 2.73's I had no problems launching and did not spinn in 2nd.

With the 3.73's I spinn like crazy through 1st 2nd and part of third and run 2 tenths slower.

I used to be a big nitto fan but not anymore these tires cant hold my car for nothin and I was cookin the hell out of them and running them at 14 lbs.

I guess that I need some upper and lower control arms and some sub frame connectors and maybe with that I will be able to hold some traction.

The worst part of it is my girlfriend is pissed that I spent all that cash and my car runs slower


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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit 3.73 FMS gears cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires. Edelbrock 1 1/2 inch drop springs.