Mightymike2000ss

iTrader: (4)

alright so i just had the prc 5.3 and the ms3 from text speed installled on my car along with jet hot long tubes, slp underdrive pulley, and maf. (stock ls1 INTAKE MANIFOLD) my question is ever time i take my car to like 6400 it makes a werid rattle noise like plastic, you can tell its not metal. it only does this when im like 4k plus does anyone know what this is, i have 2 main ideas

1) is that the car isnt getting enough fuel top end.

2) the car has the stock intake manifold maybe its not being able to spin all the way up to 6800 without anyproblems

does anyone have any ideas im so confused and on top of that when i do like roll racing i can get first to second in a breeze but when i try and get into 3rd its like a fight getting it from 2nd to 3rd

WHAT THE HELL IS GOING ON I JUST WANT TO BEAT ON SOME HONDAS GIMME A BREAK
p.s. the car has a mail order tune from tsp

Viper

iTrader: (6)

1. - get it on a dyno to see where the AFR is

or

2. - buy a wideband and HPTuners/EFILive and do it yourself

Does it feel like it's difficult to push past 6400?

Mightymike2000ss

iTrader: (4)

yeah sometimes it boggs down then it will pick up, i was reading maybe its the octane i was putting 91 in but on my tune sheet i said 92 im gonna try that and see how that goes.