a few questions after going to tack...

[88hatchblack]

a few questions after going to track...

I went to the track this sunday. with the stuff in my sig, 75*F weather with low humidity, about 1200ft above sea level; and with removed front sway bar I ran 14.18 @ 98.32 mph with a 2.17 60'. very dissappointed. i ran a 14.28 with the crappy stock motor with like 100k+ miles!! does that seem slow for the mods to anyone else? any input would be appreciated. also; how much differnce would a TFI make? my friend switched TFI's from an ACCEL back to the stock E6 unit and went from 14.2 to 13.9 with a stock 86' motor with an EDELBROCK intake.

 

[5spd GT]

Yeah that time is slow (the mph is what is most important)...what is your timing at? Spark plug gap? Fuel pressure at? How is your clutch? What about your driving skills

 

[notchback]

sounds like you need a dyno tune

i too ran 14.20's in a bone stock 5-speed w/ 2.73 gears and street tires

i'd say your off by 3/4 second and 8 mph

 

[BaXTeR3221]

Agreed, try playing with the timing/fuel pressure at the track or have it professionally tuned on a dyno.

 

[darthcual]

Well the sea level is not gonna help you out any, thats for sure. You'd run a much quicker time hear in Texas.

DC

 

[88hatchblack]

I have a centerforde DF clutch, FP at 42PSI vac off, timing advanced to 14*, plugs are brand new AUTOLITE 25's gapped to .60 (I have a MSD 6AL), driving skills are good I guess...I'm certainly no pro.... ...I'd love to get it dyno tuned, but there's nowhere around here to do that.

 

[88hatchblack]

any ideas on how i could diagnose the problem?

 

[88hatchblack]

anyone?

 

[88stangmangt]

you can tune it with my car wanna line up with me??......you should be in the 12's easy...though.....you got that maf calibrated right......like stated above you need a dyno something has you by the balls....

 

[thinker]

yeah those times do not seem right at all, my motor is stock and I ran 14.20 @ 98.7 and I ran about the same 60ft time as you lol, bad I know but it was my first time out.

 

[Ranchero5.0]

Stupid stuff first, have someone mash the accelerator pedal while you look at the throttle plate to make sure it's opening all the way although with the 70 it's almost too big even at 80% throttle compared to the rest of the motor.
did you port #1 and 5 ports on the GT40 lower? They are almost as tight as a stocker.

I'd also redo the calculations on the comression ratio, you may not be making the power you should just from that.

Jamie

 

[88hatchblack]

Stupid stuff first, have someone mash the accelerator pedal while you look at the throttle plate to make sure it's opening all the way although with the 70 it's almost too big even at 80% throttle compared to the rest of the motor.
did you port #1 and 5 ports on the GT40 lower? They are almost as tight as a stocker.

I'd also redo the calculations on the comression ratio, you may not be making the power you should just from that.

Jamie

all the ports were were made larger, but they're all the same size. they were gasket matched as well. it wasn't done by me. the heads were decked so machinist said the CR should be 9.6-9.7. i think I'll do a compression check on all the cylinders first, then some other stuff to rule out any problems with the engine. then just go from there. i pullde the codes, but nothing major. i wish i had an a/f ratio meter but i don't have the $$....if i can't find the problem i'll try switching parts one at a time from my friend's car to see if i can figure out the problem (MAF, Computer, sensors, ect...)

 

[88hatchblack]

but wouldn't it be easy to tell if one of those was the problem? or could something like a bad MAF, sensors,TFI, or Computer even make that big of a difference?

 

[Funanin]

u could try backing off that fuel pressure to 40... I know alot of guys that run 11's with stock fuel pressure. (38psi)

 

[88hatchblack]

tried that at the track---slower by .02