With just a lid and cutout, it dynoed 310/322

I installed Longtube headers, Catted Y, Magnaflow, LS6 Intake, and various free mods.

Two weeks after I installed them I got it dynoed, and it put down 319/323.

So, I gained a whopping 9 HP and 1 TQ.

What do you guys think the problem is? The only thing I could think of is that the pedal may have been hindered by a thick rubber mat I have on top of the stock one.

The A/F at WOT is 13.5 all the way through.

 

What kind of dyno? Mustangs #'s are lower then dynojet.

 

Hpefully you have an auto tap or charts from previous and now. Getting false knock and losing timing?,

 

The A/F @WOT is a little lean. You need a tune to get the benefits of your
mods. Moving more air thru motor now. The gain w/the ls6 intake should be
10/15hp & headers added should get total gain at least 25.

 

Same Dyno, Same Day? A tune should help.

 

sounds like dyno is junk IMO

 

Tune would def. help, you also need to take into account weather differences, they make a bigger difference than a lot of people think.

 

Does the car feel any faster?

Cars are so freakin finicky. I only gained about 1.5 mph and .2 seconds in the 1/4 mile from my long tube headers.

 

And that's with a tune

 

Here is the dyno chart...

http://img72.echo.cx/img72/5498/dyno67044ok.jpg

What is with the dips in power in-between 3000-4500RPM? I think this may be my problem. When it hits it, it drops a good 10-15HP, and doesn't seem to recover from it very well. It did it on all three runs, but at different RPMs.

Is it pulling timing?

 

Might be weak val springs

 

Would the 93 degree temperature play a factor as to why those dips are there?

 

What are the chances of a clogged fuel filter playing a role in this?

 

Tuning is needed to adjust fuel trims etc....

 

put a guage on it while load testing to find out if there's a restriction.