ok my b18c has a skunk2 intake manifold aem fuel rail blox fpr blox vaccume box fmu and a turbo kit. i just took it out and first gear rips but when i go into second i boost like 10psi and i start to backfire i think its a fuel cut but i have a manual boost controller how come it is boosting so high in higher gears is it my wastegate spring please help

 

is it cutting out or is it backfiring? if it is backfiring, i would think it was running rich as hell with the FMU.

 

its backfireing how do i make it run less rich then

 

Your car needs TUNING.

I see you have an FMU in your list, even so, you STILL need to tune an FMU correctly. If you wanna stick with it, Id suggest using resistors, or an AFC hack.

With so much tuning choices out there nowadays, I dont see why you chose to go that route in the first place. If you want it to run truly properly and be reliable, I'd suggest you get rid of that FMU, and get your ecu chipped with a map of setup, and take it STRAIGHT to a reputable tuner.

FMU's are dangerous when not tuned properly, if you dont find out how rich or lean your car is running, youre gonna be back up here posting carnage pics, or leaving big black trails of smoke. ;-)

 

well my shop that does tons of tunes and is honda specific aid i can run the fmu for now bc i have stock injectors. im only trying to run 5psi and at 5psi it runs good but at full throttle when i hit 10psi it backfires so if i can get a 5 psi spring do u think its gona b safe just for like a couple months

 

fmu . neptune or something similar. do u know u could have your ecu chipped and had a basemap for about the same price as an fmu

 

What size spring do you currently have? Post the rest of your setup.

 

Dont ever run FMU, chip your ECU its cheep. And base map alot better than FMU!

 

doods i cant afford to get a chip ok so u can stop tellin me to chip it im gona chip it im not dumb but for 5psi i cant run a fmu fine. so i found out my spring is a 10lb spring and not a 5 so i giota get a new spring or do it the ghetto way and cut my wastegate smaller

 

^ Ghetto would be correct.

 

we know your not dumb (coughbulls#!tcough) im just saying the price for the fmu and now an extra spring= a chipped ecu and basemap. but hey do you im not mad.

 

So save up until you can. It'll be worth the wait, trust me. :-)

[Obiwan Kenobi] Patience, my young padawan [/Obiwan Kenobi]

If you CANT wait, and end up getting the 5 lb. spring, you still gonna either need an AFC hack to propery dial in the AFR, especially if you still running stock injectors. We are not trying to be dicks, we are trying to save you time and money. Once you chip it, you still would have to sell the FMU, the AFC hack and the 5 lb. spring, and then, not too many (if not the majority) of ppl are not gonna buy it for the simple fact that A CHIPPED ECU IS THE PROPER, SAFEST AND MOST RELIABLE WAY TO TUNE A CAR.

 

obviousely the fmu aint cutting it man so these guys are right dont get mad when you ask a ?, because they are trying to pint you in the right direction

 

well it dont cut out on 5psi so it cant b the fmu a dood above said he ran 22psi on a fmu belive me i want hondata baaaaaaaaaaaaaaaaaaaaaaaad but im broke do u think its cutting out bc of the stock injectors

 

fmu is supposed to work with your injectors. it shoves more gas through them. its just crap. u should also have a missing link or check valves where the map sensor goes . if ur gona use that crap u should also have a msd btm so that it can retard ur timing under boost or just retard the dizzy. *** it leave the ten lb spring in it and turn the boost up to 22lbs and then show us the pics of the aftermath lol. it sucks being broke.

 

the fmu was free thats y i got it and i have a apexi vafc that i got for free and i have a fpr and fuel rail how is everyone gona tell me my car wont run good on 5psi with my setup. but **** it i apreciate all the help i knew that hondata was better than a fmu before i even came on here but im taking my car to one 6 motorsports and they are gona tune my vafc

 

I'm sure they will be ecstatic to tune your setup. Do you even have a wideband in the car to monitor a/f as your boost increases? How are you retarding the timing?

 

my vafc has monitoring graphs on it but im probly going to buy the aem wideband setup too

 

Look into the NGK wideband also, you'd have the option to upgrade to the better NTK 02 sensor. Both come with the Bosch sensor (which has been known to go bad quicker than the NTK in some cases), but the Bosch sensor that comes with the NGK has an NTK plug, so you're able to upgrade to the NTK sensor without having to rewire.

 

back to his original problem...running 10 psi on stock injectors and getting "pop" is probably because the injectors are maxed. Based on what you're running right now...STOP whaling on your car. BE CAREFUL. Also check your plugs...what are you running? what are they gapped to? You might also be misfiring due to the gap on your plugs.

 

don't TOUCH YOUR SPRING EITHER! doing that is just going to cause nasty boost creep.

 

finaly some good help thanks guys ya totaly let the plugs slip my mind i need the cooler plugs and ya im pos the injectors are maxd i onl;y wana run 5 psi i hit 115 on half throttle 5 psi in 5th today was just takin it easy i love boost

 

For plugs, look in to the NGK, heat range bkr7e. Plug gaps vary between hp, so check with who's tuning your FMU for the proper gap.

 

alright i will do thanks man

 

a chipped ecu is 150$ and u can use crome for free... and dsm injectors are cheap.

lets see. a new motor and labor or 200$. it still amazes me people take this risk