dissapointed with performance

[wildstanggt]

Hello

my car mods are in the sig and with the trick flow street intake and BBK lowering springs my best 1/8th e.t. was 8.06 at 88 mph with 1.70 60'. using a car math calculator that equals a 12.6 in the 1/4. I am a little dissapointed. since then I installed the performer RPM II and it still feels sluggish. I have a burned superchip and my timing is at 14 the fuel pressure is at 36 with vacuum and 24 lb injectors. Any suggestions, should I pay for a dyno tune or are my numbers reasonable. I have aluminum heads and removed the spare what should the weight of my vehicle be?
thanks for the help

 

[NKau]

You have any work done to those GT40X heads? Those heads seem to be kind of maligned by a lot of people.

 

[ram360]

What size throttle body are you using?

 

[90mustangGT]

36psi fuel pressure with vaccume??? Kind of high don't you think? that would make it about 46psi with no vaccume or WOT! I have mine set to 37psi w/o vaccume, it reads about 27-28 with vaccume.

Good times and really good MPH on the 1/8th.

 

[NeQX]

ok you ready to run 12.00's or better listen up

-New Fuel Filter
-New Spark Plugs
-Check Cap&Rotor
-Adjust TPS make sure its at .99
-Manually Check By ThottleBody To Make Sure Its Going WOT
-Adjust Fuel Pressure To 40psi no vac (Dyno Tune Will Be Most Accurate!)

As far as dyno tune, you can pay get a couple a/f pulls and adjust timing and FP yourself, its easy stuff...just need dyno time.

I dyno tuned my car, I would have to say you got alot invested in the motor what is paying $100 to make sure its all running properly? You dont want to be running too lean or too rich.

Good luck! Keep us posted how its coming

 

[wildstanggt]

thanks guys

the heads are unported. I am running a 70mm throttle body. Yeah I am thinking about a good dyno tune. The cap and rotor have just been replaced along with a MSD 6A ignition and wires. This next weekend I will be heading to the track and will be playing with the timing and fuel pressure. If my times do not get better I think I will look into a dyno tune. By the way, how do you adjust the TPS? thanks NeQx, hopefully I will be running 12.00 , I feel like I should be able to!

 

[NeQX]

you stick needles into the TPS wires to probe them and use a multimeter to check voltage...

http://www.allfordmustangs.com/Detailed/581.shtml