slopoke

ok well the first question is about the fuel ratio and if i need a ecu in your opinions. i have a drop in k&n air filter with holes in the bottom of my stock air box with pipes running to the front, second mod is a downpipe, third mod is a high flow cat, fourth mod is a cat back system. now i know you are suspose to get a remapped ecu after two and now i have 4, so theoreticly i need one, but here is why i am not sure, i have a autometer air/fuel ratio gauge and it reads allmost allthe way rich when i am flooring it, and i also have a apex autotimer and when i floor it, it reads about 11.2 or so. so my gauges show it is running rich still. why is this? shouldnt they show it running lean, or am i still fine?

second question regards the backfiring, when i got my exhaust done recently i noticed it back fires or makes a series of a few pops somtimes between shifts when i am driving normally and shifting at 3000 or 3500 and sometimeswhen i let of to coast it does a nice back fire what causes this and is it normal?

any info on the above would be greatly appreciated and i thank you for all the time and help, scott

Bacon

iTrader: (12)

well stock o2's arent worth a damn when it comes to being really accurate..i ran the same 4 mods on a stock ecu b4 i knew what i was doing with no ill effects ( yes i know this b/c i just dissasembled the engine--it was b/c of bad coolant seal and showed no detonation damage)

but i was non seq, so i dint have to worry abt a boost spike, or abnormal boost(profec b) on a cold day wich seems to be one of the biggest killers out there

personally if you donthave the $ for the ecu keep you boost down, and take it easy a ecu is cheaper then a new motor

the back firing is normal especial @ arround those revs /c the secondary injectors come online @ abt 3k rpms so you getting the more fuel in and when its not all burned it pops, get a ecu and a mp and shoot flames all over the place

slopoke

thanks bacon, dp is working great by the way, anyways, i guess i will take it super easy until i can get an ecu, on a side note about boost spikes i noticed they have been being high, so last night in third gear i put it to the floor and on the first turbo it was 13 psi then trailed of to 12 then ssecond turbo was 12, so i will take it easy and hope for the best until i can get the $for an ecu, thanks, scott

Bacon

iTrader: (12)

slopoke

also on a side note it does not smell of gas like it use to out of the exhaust so i guess that should have been a clue too huh, one more wuestion, how do you know when you need larger fuel injectiors and or a fuel pump? thanks again, scott

Bacon

iTrader: (12)

more boost= more fuel, if you run full mods @ abt say anythig above 10 psi you need a pump, and if you run full mods ( intake dp, mp, cb, ic) above 13psi you injectors will prob be going over 80% duty cycle and this is bad, and you loose controll over the injectors, althought the stocks can suply enough fuel for 1 bar, why chance it..