New motor slower than stock ... READ

[Jozey]

dude stock fuel pressure with stock injectors is 38-40 psi.id run 40-42 psi.how many miles are on the motor? if it was just built the rings could not be seated yet.just try tuning some more.

 

[craigwhite89gt]

950 miles on the motor, i was running 30 # inj at first but the motor really ran like a peice of **** so thats when i put 24s back in, jus to let yas know

 

[90lxcoupe]

are you sure that you are using the right plugs in the car?(some heads use a longer plug and sometimes people just through the stock length plugs back in) when i bought my car i didnt touch the plugs and when i got it to the dyno i found out the car had the wrong plugs in it and we swapped out the plugs there and it was like a totally different car after that. my tuner told me that guys make that mistake with GT40X heads all the time, dont know if thats true with ur heads but i figured id add my .2 cents

 

[craigwhite89gt]

you know thats a good point ill have to check into that

 

[Jozey]

im running 30's on my 306 with no problems.my fuel pressure is 40-42 psi

 

[stangjunkie]

trick flows dont take the standard plugs they use a much longer thread on the plus