hi guys

im back after some hard days.

i did some test and cant find whats going on.

unplugged #1 sensor ( the one on the manifold before the cat)
unplugged #2 sensor ( the one after the cat and after the flex )
unplugged both 02 sensor
no difference at all.

i cannot even see check engine light ( had to completly remove it... did 8 garage , NO ONE could get a code out of it even if the light was on , even hyundai couldnt ). a known hyundai problem from 95 to 2002.

the fmu is really working.
i have enought fuel pressure.
garages said i had no issue about fuel even in boost ( pressure and debit )
they said pressure was a little high but thats was not the problem.

also 1 of those mechanic already boosted a 97 hyundai accent and had the same setup ( better quality..... but same system with fmu no piggyback etc ) and said he had no problem at 12 psi. blew it when he pushed it to 15 psi.

i called my prefered performance & tune shop and talked about my problem for the 5th time.

fuel cut is the only possible thing he can think of.
i asked him how much he could sell me a fuel pump and a aem f/ic... and the answer surprised me...

he said yes the aem f/ic will fix it but he wont sell me one because he is not a dumbass scammer. he know my situation and think it would be stupid to put that money on a car i get rid soon ( the tune = $$$$$$$$$ )

he is talking with other specialist at the shop to find the exact problem but he is sure ( like you guys ) the problem is fuel cut.

i could get a fuel cut defencer but.... with all that garages sucked me im left with 45$ free in my pocket for the winter ( yes i have bills to pay like you ) :)

fuel cut defencer = to forget. ( anyway ive got told its wrost than fmu )

isnt there a way to make one ?

any other idea ? i need my turbo car for the winter and cant get pricey parts until this summer.

EDIT
i think they was wrong about hyundai MAF.
im sure the maf is maxed out so the computer turn into limp mode.
bigger maf is a problem because im on a low budget and used hyundai parts are hard to find here.
so the only solution is a maf clamp.

but i have no idea how to make one.
anyone know ? or other solution ?

your getting rid of the car soon anyway so just lower the boost so fuel cutoff doesnt happen and have some fun with it. there is your solution.

the only other solution is $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$ cha-ching!!!!!!!!

dropped boost to 7 psi = same
dropped to 5 psi ( friend garrett t25 WG ) = same
not tried under 5... no one will ever set a turbo under 5 psi anyway...
i think i will modify my WG again for 5 psi and get a new external one for the elantra.

thanks anyway for your help

here some news.
even at 5 psi still the same problem.
added a tiburon 2.0L MAF , changed idle but still the same problem on boost.
1.5l or 2.0l injectors change idle but the same trouble on boost.

im lsot. i need the car to run good under boost until i get a SMT6 or FI/C.

is it still running lean? post pics of the car. i want to see how you have it set up. 5 psi with an fmu should not cause a 20:1 afr lean mixture.

i don't have pic of the final setup. but what have been done after those pic is the piping , better homemade vaccum manifold , and temporary exhaust fix.

Attachment 38930
https://www.homemadeturbo.com/attach...ine=1357709096
Attachment 38931
https://www.homemadeturbo.com/attach...ine=1357709096

post pics of the current setup. cant really see anything with these pics...

problem fixed !
maf clamp ( 4.3v zener diode )
i tried with 4.7v but fuel cut happen around 4.4-4.6v
im now running 10.3 AFR on full boost. a bit too rich but its better bein too rich than too lean :)
i put back the stock MAF so idle is perfect.

cost 2.93$ CAD

btw im surprized of the FMU stability. and there not even half a second delay for the fmu to work.

this thread is also another proof that fmu really work great ! sometime cause small problem but it work well.
for sure i dont go the fmu way anymore because parts price is almost the same as a piggyback without tune. if i get it tuned then ill still go with FMU because it cost way less and still do a great job. but as now i know i can tune it meself there no way i will work with fmu again :)