sr20det doesnt like boost

[dropped]

hey every one im having problems with a motor transplant i have done.

it is a nissan laurel c33 and the motor is a sr20det from a facelift s14 silvia.

here is a list on mods done to the motor before i start so you have some idea of whats going on.


# s14 facelift sr20det black top
# 5 speed
# top mount manifold
# t3/t4 500 hp turbo
# bradied oil lines
# 38mm external wastegate running i think a 7psi spring
# 10mm fuel lines
# fuel psi reg
# wrx fuel pump
# 12 inch eletric fan
# 50mm bov
# 600x300x75 intercooler
# oil catch tank
# s14 facelift ecu and loom cut down to only wires needed
# pod filter
# has a 2.5 inch exhust go down the car till half way then goes into a standard exhust for the moment.



ok now the problem. it starts fine every time. has a littie miss at about 3g i carnt firgure out why.

also it doesnt like boost what so ever every thing ive try nothing will fix it.

it has 14 volts at the ecu when running good voltage at the fuel pump as well. fuel reg is set to 38psi with vacume line off im stumped? what could it be it does have cheapish plugs in it tho must i run platnums.:hammer: :hammer:

[Gramentz]

could be the MAF

[F3600]

check you plug gap solved miss around 3000 4000 rpm on my ca18det.
run cheap copper plug ..platinum dont do shit ..just lasting longer. i was running cheap champion copper plug in my 240 and it was running superb.

check you coilpack
check for boost leak

[dropped]

check you plug gap solved miss around 3000 4000 rpm on my ca18det.
run cheap copper plug ..platinum dont do shit ..just lasting longer. i was running cheap champion copper plug in my 240 and it was running superb.

check you coilpack
check for boost leak



already checked for boost leaks coundt find any thing.

i run a cheap plug and gap them and also change them more often. but what should the gap be at?

if my coil packs are rooted im going to convert to a wated spark setup

[TheSquidd]

I had misfire at 3 grand, ended up being a coilpack. New pack made the car run like a CHAMP.

[dropped]

sadly this mite be the case for me as well i think im just going to convert it to a wasted spark setup its just easyer. all nissan coil packs suck nuts:mephfawk:

[dropped]

is any one able to help me out with this one

[RedtopTech]

how much boost are you running? That exhaust isnt going to flow enough to push a lot of boost, also your injectors may not flow enough. Keep in mind that the t3/t4 flows a lot more air than the t25 at the same psi.

[Dousan_PG]

what injectors? what fuel management are you using too?

[dropped]

I had misfire at 3 grand, ended up being a coilpack. New pack made the car run like a CHAMP.


yea but mine wont go on boost pretty much at all. im going to try track down anther afm but i dnt think it will help:bash:

[240sxballa]

i was miss firing in 3000-4000 revs on my s14 redtop . and it was my tps censor (throttle postion censor) maybe check ur MAF and ur tps is it idling bad or normal?

[johngriff]

ok.

WHAT MANAGEMENT?

GO BUY THIS!!!

http://www.plxdevices.com/

Log The Air Fuel Ratio, get back to us!

[LB.Motoring]

I had misfire at 3 grand, ended up being a coilpack. New pack made the car run like a CHAMP.

duh, i fixed it hahaha welcome!

hahaha yeah ez fix, I knew it had to be that

[Vatche]

so all that trouble was from a bad coilpack?

[dropped]

i was miss firing in 3000-4000 revs on my s14 redtop . and it was my tps censor (throttle postion censor) maybe check ur MAF and ur tps is it idling bad or normal?



yeh it doesnt idle the best at all really. as for fuel managment im running a s14 computer and loom. how do i check the tps and what the hell is a maf? i take it that its an usa term. air flow meter ?

[dropped]

ok i checked the tps its all good working sweet. i wonder what it is :werd:

[Dousan_PG]

is your computer retuned for your set up (rom tune)
did you up your injectors

sounds like the problem is a half assed setup imo

gotta get a rom tune AT LEAST
gotta up your injectors
and im assuming your air flow meter can handle the power upgrades too.

[LB.Motoring]

so all that trouble was from a bad coilpack?



yes sir... :D

[dropped]

is your computer retuned for your set up (rom tune)
did you up your injectors

sounds like the problem is a half assed setup imo

gotta get a rom tune AT LEAST
gotta up your injectors
and im assuming your air flow meter can handle the power upgrades too.



there is no mods to justify a retune. its running less boost than standard at the moment. intercooler and fpr it should atlest be able to drive with boost but it doesnt.

[Dousan_PG]

how much boost you running?

[johngriff]

larger turbo = more cfm, less psi than stock turbo.

bogging at 3k, maybe your maf. Take pictures of your settup and post them. YOU NEED a retune btw.

[dropped]

yea i no i need a retune it will be going on the dyno asap. but i have to get it running kinda right. what the fuck is maf ?? it is running a standard air flow meter standard injectors wrx fuel pump and fpr running 0.5 bar boost.



http://www.cardomain.com/ride/2169517 pic here

[johngriff]

MAF Mass Air Flow meter or Air Flow Meter

pics?

[Vatche]

http://www.cardomain.com/ride/2169517 pic here

i think the pics are on this link john,

Edit: Unless he edited them into his post :( sorry

[dropped]

yes the pics are here http://www.cardomain.com/ride/2169517

[dropped]

bump will try anther afm to day and let you guys know

[dropped]

UPDATE


ok to day i swaped all my coils over into anther car. and they all work mint as. no miss or any thing of the sort.

also put my afm into the car as well. and it works mint too.

also changed and gaped the plugs still didnt make a diffrance to the car.


im stumped maybe its aftermarket ecu time