I went to the dyno yesterday and this is what happened.

So



He said the fuel pressure started to drop at around 4500 so he started to let off slowly to see if it would go back up at all and it never so he let off.

Wtf?

 

what fuel system are you running?

 

Whipple kit
The Dual pump with I think 38# injectors.

 

Whoa... That definately needs some smoothing.. Maybe a fuel pressure regulator or the pump is on the fritz.. idk thats strange. And you're still putting out 400hp @ 14:1

 

What should the A/F be at???

 

You need to check all your wiring for the gt500 pumps. check the second fpdm and check your grounds. I looks like only one pump is working.

 

yea check the wiring i think as well that only one pump is working for you a/f should be at least 11

 

Oh and the engine code I ran a few days back was PO174. Anyone know what this means?

 

It means the o2 sensors detected a lean condition. It means system too lean. \

http://www.obd-codes.com/p0174

 

Did you do the install? I'm sure you made a post about it, but my memory is going. Someone had a shop install theirs and they forgot to plug in the second fpdm. Needless to say it ran lean on the dyno just like yours and only made about 400hp before the computer pulled timing and killed power. One of your pumps could be bad or the second fpdm is bad, but i'd check the grounds first.