Performer head/cobra intake Dyno #'s

[stangin it]

I had the car dynoed today ran into alot of problems. The car is pinging like CRAZY the other mechanics heard it from the other room. When i got there the fuel pressure was set at 42psi vaccum on and the timing was -4*:o The distributor was put in wrong when i did the head swap.

These #'s are STD corrected not SAE......
1st run...... 278 rwhp 293ftlbs it was running very very rich

Put the dist back the right way and it kept pinging so i had to lower the timing to 7* fuel pressure is set at 39psi vaccum on...
This pull was...... 287rwhp 310ftlbsb 17.5 A/F thats a bit off but its definately running lean.


I did another run but it got aborted because of the severe pinging.I still have stock injectors and my IAT sensor is broken they seem to think thats why its pinging. Maybe monday i can post the graphs i dont have a scanner at home. The rest of my mods are..... Performer heads 1.90/1.60, cobra intake, C&L maf, pullies, shorty headers, mac prochamber, catback, i still have stock TB and stock cam.

 

[stangin it]

This graph sucks but here it is.....
http://www.mustangmods.com/data/294/picture.jpg

 

[flyinghi3]

i'm surprised they said for you to do another run with your a/f so high. i was down there too on saturday and i had a A/F of 12.5 and they said it was not a good idea to do another pull. maybe because i have a blower.

 

[stangin it]

They heard it pinging from joes office with the door shut the guy driving the car didnt hear it pinging which is understandable because the car is pretty loud. I paid $75 just like everyone else so i cant really expect them to sit there and tune my car. How do u think i should go about fixing this problem??

 

[doggy6969]

those are pretty decent #s. in the new issue of 5.0 mag. they only dynoed like 245rwhp. dont understand why theres was so low cause i seen a bunch of you guys getting between 270-310 rwhp with these heads.

 

[somersdp]

You should set your fuel pressure with the vaccum off. That is part of your problem. Your pressure is off and causing it to run rich or lean.

 

[5.0 HOtrain]

This pull was...... 287rwhp 310ftlbsb 17.5 A/F thats a bit off but its definately running lean.

17.5 is super lean, might be a mass air problem. I had the same thing first time I dynoed the 302, was around 15/1, changed meters and went down to around 12/1 if I remember correctly. It did not make a huge power change though, first time was 299rwhp, better a/f was 303rwhp