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Nibras
06-01-2011, 05:30 PM
alright so i just finished throwing in this ca18det swap in my s14 . i upgraded the stock turbo to a gt28 turbo , i am noticing when i drive the car , 1-3 gears are fine when i get to 4th gear and hit about 3100 rpm with the throttle fully open nothing happen after that point until i go under the 3100 rpm mark. its usually right before the boost kicks in in those high gears.

and when i get to 5th gear i can not exceede about 2500 rpm .

i am not sure if this would link to a maf problem. or a boost problem .

but i can pretty much red line the car in the first 3 gears and boost no problem.

some input would be nice ! thanks ZILVIA PEEPS.
KiLLeR2001
06-01-2011, 05:37 PM
Not too familiar with the CA18, are there 4th gear and 5th gear sensors in the transmission? If so, are those plugged in? Does it feel like a fuel cut when you exceed the rpms?
Nibras
06-01-2011, 05:41 PM
Not too familiar with the CA18, are there 4th gear and 5th gear sensors in the transmission? If so, are those plugged in? Does it feel like a fuel cut when you exceed the rpms?



it feels like everything cuts out, and not slowly its as if the car shut off or something, it only does this once i get to that rpm. the car use to be automatic ka but i converted the harness and rewired it onto the tranny
Sileighty_85
06-01-2011, 05:49 PM
what MPH are you at at 3,100 in 4th?
projectimura
06-01-2011, 07:49 PM
i think you have a small leak. or your maf is sh*$!
Nibras
06-02-2011, 08:49 AM
what MPH are you at at 3,100 in 4th?




id say around 45-50
Nibras
06-02-2011, 08:51 AM
i think you have a small leak. or your maf is sh*$!

i dont think its the maf cause its the same maf the kid before me had in his s13 and i new him and drove with him and never had this problem ,and as for a leak , its doesnt feel liek aleak problem , once i hit 3100 rpm the pedal becomes completely useless no matter how far i push it it feels like a dead pedal
Edwin562
06-02-2011, 08:51 AM
tranny sensors(5th gear) is what popped in my head... check them out...
Purestock240
06-02-2011, 08:53 AM
try and pick up an automatic ecu, i think it disregards all of the gear sensor issues and still runs flawless, maybe someone else has insight on this
Nibras
06-02-2011, 08:56 AM
tranny sensors(5th gear) is what popped in my head... check them out...

what do you want me to check for? they are all there should i try unplugging them and driving without them
Nibras
06-02-2011, 08:57 AM
try and pick up an automatic ecu, i think it disregards all of the gear sensor issues and still runs flawless, maybe someone else has insight on this

oh man it was hard to track thiis 5spd ecu ITself ! ill see if anyone in orlando has one i can just mess with
KiLLeR2001
06-02-2011, 09:03 AM
I'd guess something with the tranny sensors or the ECU itself. Double check all the wiring connections in between.
Nibras
06-02-2011, 09:05 AM
I'd guess something with the tranny sensors or the ECU itself. Double check all the wiring connections in between.

thanks im on it, ill let you know.
cjmirabal1
06-02-2011, 10:37 AM
yeah check ecu out... ive seen some picky motors with similar issues and it was just a simple ecu swap... there picky lil things lol, i cud imagin in a s14 also

what ecu and maf are u running?
Nibras
06-02-2011, 05:33 PM
yeah check ecu out... ive seen some picky motors with similar issues and it was just a simple ecu swap... there picky lil things lol, i cud imagin in a s14 also

what ecu and maf are u running?

im running a normal ca18det maf and 5spd ecu

the numbers on the ecu MEC-D016B and number 78 it says its for a MT . so i shouldnt see why theres a problem
cjmirabal1
06-02-2011, 07:05 PM
Upgrade ur maf...stock maf blows even with stock turbo
Nibras
06-02-2011, 07:46 PM
Upgrade ur maf...stock maf blows even with stock turbo

you mean to a z32 one. this wouldnt have this much affect on it tho! i test drove the car today and i got it to rev in 4th and 5th but i was redling it in 3rd and switched to 4 and redlined it again and then to 5th then i turned the car around and the car died.
TheRealSy90
06-02-2011, 08:23 PM
You running a CA18 ecu? Did you re wire the ecu plug?
Nibras
06-03-2011, 07:17 PM
You running a CA18 ecu? Did you re wire the ecu plug?

ya the kid before burnt his wire harness and the ecu so i got it rewired and got a ecu off someone . the ecu is a bit different as the old one was from a silvia and the one i got was from a 180sx ca18det but the motor is the same so i dont see why it would affect it. i figured this problem occurss when i reach a certain speed.