Just installed TW heads and now have HUGE problem with pinging realy bad

[Slow5.0]

Two days ago I installed TW heads , B-31 cam from AFM, 24lbs injectors and "PRO-M 75mm bullit for fox body Stangs" ,first day I didn't have problem with pinging but next day it start pinging realy bad
I try bump fuel pressure from 36 to 40psi with vaccum hose but still nothing , cambers on new heads are clean so that isn't problem, timing is 13.5*, i tryed clean new MASS and ACT sensors with carb cleaner but still nothing, I runing 93 octane gas
Did anybody have same problem like me after swaping heads and how I can fix this
I know I need tune ,but what I can do with this before I tune my Stang

 

[krahkin]

Did you have your pistons notched for the TW heads?

 

[Slow5.0]

Yes i'm and clearence now is .110000

 

[VIPERn94Five-0]

retard the timing back to 10* and run premium fuel...mess with the mass air a little...kinda turn it and what not...the 75mm bullit meter is real picky, and doesnt work right on everyone's cars...


Anthony

 

[YEAHLOH95]

what thermostat are you running ? its getting hot here in pa ,and you are making more power now and power means heat, how was it on the temp gauge when it was pinging , if thats not it you might have to back off the timing .

 

[mo_dingo]

Retard the timing to 10*. That should help.

You might need a custom tune to work all of the bugs out. But for now the base timing retard should fix it temporarily.
Scott

 

[BlackVert]

also make sure you don't have a vacuum leak. i started pinging out of the blue and it was like 2 weeks before i figured out that a plug on the pcv valve had come out.

 

[Slow5.0]

Today I retard timing to 10* and pinging is less, but still there in 4th and 5th gear, I bump fuel pressure to 42psi with vaccum hose now
What if I buy TwEECer R/T, can I do tune with my self

 

[GTJake]

You'll still need to get on the dyno or buy a wide band system to get the A/F nailed down.

Jake

 

[swingline]

Wouldn't he need new sparkplugs for the aluminum heads?

 

[jwalker]

autolite 3925's or 3924's for tw heads

 

[1105]

Your car pings above 10 degrees of timing? My car wont run worth **** if its anything under 14 degrees of timing. If you havent got new spark plugs try thoes and make sure you're running 93 octane.

 

[BlackVert]

What if I buy TwEECer R/T, can I do tune with my self

1. is the pinging only on higher rpms?
2. that is exactly what the tweecer is for, doing your own tuning.

 

[gcomfx.com]

What did you gap your plugs at? Pull them and see what color they are and let us know.

 

[VIPERn94Five-0]

Your car pings above 10 degrees of timing? My car wont run worth **** if its anything under 14 degrees of timing. If you havent got new spark plugs try thoes and make sure you're running 93 octane.

your car wont run at the factory timing?? thats impossible...


Anthony

 

[gcomfx.com]

He didn't say it pinged or didn't run, he said it won't run worth ****. Maybe his fuel pressure is at 50+?????

 

[VIPERn94Five-0]

He didn't say it pinged or didn't run, he said it won't run worth ****. Maybe his fuel pressure is at 50+?????

maybe...but it thats the case then its not the timing, he is just running loads of fuel....i still dont see how the stock timing could cause a car to run so badly...


Anthony

 

[Slow5.0]

Ok guys right now timing is 10* (was 16* yesteraday) , fuel pressure is 42(was 36) and we bought Autolite 3923 because guys in AdvandeAutoParts didn't have 3924 or 3925 in the time and everything else was closed (sunday 7PM)
I think ist because on damn PRO-M 75mm fro foc body for 24#
Or meybe because I using 3923 plugs(little colder than 3925)

 

[1105]

your car wont run at the factory timing?? thats impossible...


Anthony

unless I'm reading the timing wrong and so is my dad and another mechanic then my car doesnt like anything under 14 degrees of timing. It WILL run at 10 degrees but pops a lot.

 

[VIPERn94Five-0]

Ok guys right now timing is 10* (was 16* yesteraday) , fuel pressure is 42(was 36) and we bought Autolite 3923 because guys in AdvandeAutoParts didn't have 3924 or 3925 in the time and everything else was closed (sunday 7PM)
I think ist because on damn PRO-M 75mm fro foc body for 24#
Or meybe because I using 3923 plugs(little colder than 3925)

well its not because the meter is from a foxbody...plenty of guys run fox body meters on our cars...the fact that its a 75mm may not be helping as they are hit or miss...some work on our cars, some dont...the plugs may be a little too cold as well...


Anthony