s14 sr rev limits early 5000rpm wtf ?

[alesserfate]

hey, i have a 1995 zenki s14 with a kouki s14 sr blacktop, t28, 550cc nismo injectors, z32 maf (n62), apexi afcneo set 2 in 5 out, aem wideband, afr's are good when in boost

running 14psi, whenever i hit 5grand when ripping in boost it rev limits there like a speed cut, in any gear, revs past 5 fine in neutral, i unplugged the plug on the clutch pedal too

whats the deal ?

anyone know ?

lmk thanks

edit, also idles like shit, oh and it was running fine before I put on the MAF, injectors, and new turbo

[Grenade180sx]

too much fuel or not enough... get a tune. 550's wont idle if you dont take fuel out and ur gonna studder or run rich on the top end. GET A TUNE.

[99maxgtr]

^^^^ get a tune. can't expect to just slap on bigger injectors and maf without the tune for it.

[alesserfate]

its tuned, getting 11.8 AFR steadily in boost

[Grenade180sx]

then u have a boost leak, was it tuned on a dyno? if not then dont say its tuned cuz unless ur seeinf the afrs from the dyno id be hesitant to trust any afr gauge

[a7olyte]

lower to spark plug gap to 0.030" and give it a try

[alesserfate]

Originally Posted by a7olyte

lower to spark plug gap to 0.030" and give it a try

spark plugs are BKR7E with gap 0.028"

can anyone confirm my sensor IN sensor OUT value for the afcneo (see first post) ?

motor blew up / end thread, but keep comments coming if anyone had similar experiences

[alesserfate]

anyway back to this again, motor is running again, last night i sucessfully adjusted all the settings and it was idling properly and pulling hard steady at 11.0AFR at 12psi all the way to redline

however after increasing boost to 15psi and compensating fuel for it, it would start to rev limit at 5000-6000rpm again

i've checked that its not running too rich or too lean, i've also checked the ignition timing multiple times and cranked and its still what it was before, 7 degrees instead of 15 (just to be safe)

at the end of the day i turned the boost back down to 12psi and i can't get it to stop rev limiting there

also thought about decreasing BKR7E spark plug gap from 0.028 to 0.026

if anyone has any ideas why an ecu would rev limit early (besides too rich/too lean) please post up

thanks in advance!

[Grenade180sx]

that isnt a tune dude. pay the money and have it done right or something will break.

[alesserfate]

thanks for the reply, i will check that

Originally Posted by Grenade180sx

that isnt a tune dude. pay the money and have it done right or something will break.

you've stated that 3 times, if you have nothing else to state don't post in my thread anymore

i own a track s13 that is tuned with a power fc djetro and i've been adjusting things on it for the last 2 years and it makes 380whp reliably at 18psi, i track the car twice a month through hot summer days and it never has problems, so i believe you have no right to state that i don't know what i'm doing with tuning, so please and thanks gtfo

[alesserfate]

update, MAF wiring is correct

cas timing is 10btdc at 850 rpm (its supposed to be 15btcd at 850rpm but i always run 5 degrees down just to be safe on my street car)

spark plug gap is at 0.028 so there shouldn't be any ignition break up

i checked and checked for vacum leaks and couldn't find anything wrong, I'm running a recirculating valve back to intake pipe, front pcv is hooked up to the intake pipe, rear pcv dumps to crank case like factory, intake manifold is stock

[alesserfate]

UPDATE! problem solved, after swapping in different set of injectors everything is back to normal, pulls good, revs to redline, afr is good, something is up with the set i had in there.

thanks for all the advice.

oh and it wasnt the 'tune' like 'dude' was trying to pick and shove me onto hahaha peace

[WoolyS14DET]

2 in and 5 out is correct and adjusting the gap down wont correct a reving problem.
Sound like you could have the signal and power wires crossed on the MAF sensor. I would check that first