DONT SLEEP

well my car back fires really loudly. mainly loud beacuse of no exaust system. the engine is freshly rebuilt and im not supposed to take it past 4,000 rpm but i do occasionally. but when im cruising and shifting at 4k rpm it will backfire especially in 3rd. the other night this kid asked me how did i put a flame kit under my car. made me feel like a ricer. please help

craig_302

Sounds like you know what the solution to your problem is already. You need exhaust. Odds are, mine would do the same ghettofried thing if I yanked mine. Bolt up some exhaust and be happy once again.

DONT SLEEP

cool thanks

craig_302

Haha, sure thing I guess.

Sunrise City Rider

The fire is unburnt fuel that is exiting your exhaust manifold with no cat to burn it up or piping and muffler to hide the flame part of it...The popping you hear at times from those with an exhaust is the backfiring muffled...

Zee

psifactor

you most likely have unburnt fuel because you are running too rich.

SaturnTypeR

Backfires are cool...well..maybe

Sunrise City Rider

Theres always gonna be unburnt fuel as the factory settings run around 10:1 A/F Ratio which is rich...And overlap plays a role in the unburnt fuel leaving the exhaust ports...Actually Unburnt Intake Charge is a way of making power on turbo motors and can aid in the scavenging effect in N/A motors...See the explosion causes the turbine to spool and the explosion also sucks the oxygen from the head towards the flame...There are actually Anti-Lag Settings on Standalone Engine Managements that opens the injectors when the exhaust valves are open...Not for street use at all...

Zee

MattC

its alright i backfire like a bitch 1 b/c i'm running rich, 2 b/c i have a hardcore exhaust leak where exhaust meets header. watch out the cops iwll nail u for flammage!