Rtek RTEK 1.8, 4 x 750cc injectors, Apexi Neo MAXED - STILL LEAN UNDER WOT
05-03-12, 10:49 PM
#1
RTEK 1.8, 4 x 750cc injectors, Apexi Neo MAXED - STILL LEAN UNDER WOT
So... I'm running an RTEK 1.8, 4 x 750cc injectors and my Neo MAXED, but, still lean over 50% throttle. (By lean I mean 13:1 AFRs at WOT)
It will hold mid-11s AFR up until than...
What you guys think? Time for larger secondary injectors?
Could it be that I'm using a stock s5 turbo?
For engine / exhaust info please see my signature below.
Thanks for your help guys,
-Chris
It will hold mid-11s AFR up until than...
What you guys think? Time for larger secondary injectors?
Could it be that I'm using a stock s5 turbo?
For engine / exhaust info please see my signature below.
Thanks for your help guys,
-Chris
05-04-12, 07:56 PM
#6
There is no way you are making out 4x750 w/ that setup so....
A) your fuel system has an obstruction
B) you are losing fuel pressure
C) your injectors are not firing
D) your wideband needs to recalibrated
When I was experiencing similar problems it turned out be sediment that had been picked up from an old fuel pump sock. and cycled through the system. Bear in mind I had already had the injectors cleaned, dropped and cleaned the tank, replaced the fuel filter, and flushed the lines with brake cleaner. The only thing that wasn't replaced (because the parts store was out) was the fuel pump sock.
A) your fuel system has an obstruction
B) you are losing fuel pressure
C) your injectors are not firing
D) your wideband needs to recalibrated
When I was experiencing similar problems it turned out be sediment that had been picked up from an old fuel pump sock. and cycled through the system. Bear in mind I had already had the injectors cleaned, dropped and cleaned the tank, replaced the fuel filter, and flushed the lines with brake cleaner. The only thing that wasn't replaced (because the parts store was out) was the fuel pump sock.
05-04-12, 10:00 PM
#7
There is no way you are making out 4x750 w/ that setup so....
A) your fuel system has an obstruction
B) you are losing fuel pressure
C) your injectors are not firing
D) your wideband needs to recalibrated
When I was experiencing similar problems it turned out be sediment that had been picked up from an old fuel pump sock. and cycled through the system. Bear in mind I had already had the injectors cleaned, dropped and cleaned the tank, replaced the fuel filter, and flushed the lines with brake cleaner. The only thing that wasn't replaced (because the parts store was out) was the fuel pump sock.
A) your fuel system has an obstruction
B) you are losing fuel pressure
C) your injectors are not firing
D) your wideband needs to recalibrated
When I was experiencing similar problems it turned out be sediment that had been picked up from an old fuel pump sock. and cycled through the system. Bear in mind I had already had the injectors cleaned, dropped and cleaned the tank, replaced the fuel filter, and flushed the lines with brake cleaner. The only thing that wasn't replaced (because the parts store was out) was the fuel pump sock.
My AEM UEGO does NOT preheat I've notice... but, thats resolved after the car's running a few minutes. My wideband DOES function in the "rich" range (mid -11s) as it stays there until I go over ~50% throttle where it starts to climb to ~13:1 at WOT
had to order a filter... none in stock at three stores... Will let you know tomorrow...
NOTE: filled up with different brand gas and no change... just ruling that out.
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05-05-12, 08:19 AM
#8
are any of your injectors low impedence? if you have resistors inline, they can reduce injector p/w by 20%, which would make it lean like you say. i was running into this problem with rtek, maxing the correction with 750cc/1000cc injectors at only 300whp
if you are running resistors, try replacing them with lower impedence. 10 ohms is way too high, factory resistors were 6 ohms. The injector drivers can actually handle up to 3A current, so you could use 3 ohm resistors inline
if you are running resistors, try replacing them with lower impedence. 10 ohms is way too high, factory resistors were 6 ohms. The injector drivers can actually handle up to 3A current, so you could use 3 ohm resistors inline
05-05-12, 12:30 PM
#10
People.... It's a complete s5 swap.. No resistors in the s5 wiring harness. I'll be changing out the filter today if it comes in and will let you know :-)
Im running 750D (denso) RC primaries and Injector Dynamics 725cc secondaries.. They're both HIGH IMPENDENCE
Im running 750D (denso) RC primaries and Injector Dynamics 725cc secondaries.. They're both HIGH IMPENDENCE
05-07-12, 06:31 PM
#11
did you check the fuel pump voltage/rewire it? do you have an adjustable fuel pressure regulator?
i would for sure say 2.0 if your ported.... you have no control using a 1.8. it sounds like your trying to do something that the ecu can not support !
i would for sure say 2.0 if your ported.... you have no control using a 1.8. it sounds like your trying to do something that the ecu can not support !
05-07-12, 09:52 PM
#12
Have NOT done anything to wiring.. Still running stock FB pump wires... Guess i could jack it up and check voltage though...
Canister filter removed.. Stock turbo2 filter installed AFTER pump... Seems the richest i can get it to run is 11.7-12.2 at WOT
Canister filter removed.. Stock turbo2 filter installed AFTER pump... Seems the richest i can get it to run is 11.7-12.2 at WOT
05-08-12, 04:08 PM
#14
Senior Member
Me would hook up the DVM to see if correct voltage output from both (and them voltages are seen by the ECU) to rule that out.
I run the 1.8 on 4x720cc, street port, moded turbo, FPR'd, FMIC'd S4-13B and runs absolutely flawless. By the color of the plugs, fuel mixture is spot on.
Per the DVM, the duty cycle always below 80% @12 psi boost @ 7K RPM.
Last edited by Clubuser; 05-08-12 at 04:16 PM.
thats like.... pissing into the wind or something....
05-08-12, 10:36 PM
#17
Well.. I suspect my secondaries.. Did a pull starting at 3k rpm with low-11s afr... Right at about 3600 rpm it starts going lean... U can just watch to numbers climp past 12.5
So, i guess i need to check my secondaries wiring as I know the injectors themselves are golden... Ignition on > gound out secondary signal wires a ECU > listen for injector "CLICK"?? .. Or do i supply 12v?
So, i guess i need to check my secondaries wiring as I know the injectors themselves are golden... Ignition on > gound out secondary signal wires a ECU > listen for injector "CLICK"?? .. Or do i supply 12v?
05-09-12, 09:06 AM
#19
I first ran my 9.7 ratio rotors, on 87 octane, at around 7-8 psi(10th ae), WITH NO wideband. yes, it wasn't at it's full potential, and a wideband gets it there. However, tuning without a wideband is an art that can have the same results, good or bad.
05-09-12, 11:13 AM
#20
Senior Member
1st after seeing if fuel pressure drops to zero quickly when grounding the 2nds I'd use a DVM to see if they cycle when supposed to.
My DVM:
http://www.harborfreight.com/5-in-1-...ter-98674.html
xcellent DVM.
Last edited by Clubuser; 05-09-12 at 11:27 AM.
05-09-12, 12:02 PM
#21
I'll check for "click" this afternoon by grounding injector signal wires at ECU w/ ignition on. I just want to rule that out before i start "chasing my tail"... I even left Rx7 at home so i'm not working over hot engine this afternoon... I should be able to get right on it after work.
Same wiring harness -> previous engine died from front apex seal failure... REALLY curious about front secondary injector activation... Will let you know
Same wiring harness -> previous engine died from front apex seal failure... REALLY curious about front secondary injector activation... Will let you know
05-09-12, 07:33 PM
#22
Tested all injectors at ECU with key on... All same voltage... Primary Injector Dynamic (modified Bosch) injectors make loud "click" when grounded that i could easily hear while probing the ECU... Secondary RC injectors make much quieter "click" that i had to run a jumper wire under the hood from the ECU to hear the injectors while grounding.
So.... Yeah.
.... I guess i need to fake a load now, rev to 4k rpm while probing the ECU and look for a voltage drop in the secondaries with my DVM??? *Confirm signal leaving ECU to fire them? *Or, how do i do that?*
So.... Yeah.
.... I guess i need to fake a load now, rev to 4k rpm while probing the ECU and look for a voltage drop in the secondaries with my DVM??? *Confirm signal leaving ECU to fire them? *Or, how do i do that?*
05-09-12, 07:40 PM
#23
... Is my wideband dieing? I have an AEM UEGO wideband.. It does NOT preheat i've notived and rarely reads FULL lean when decelling... THESE NUMBERS ARE ONLY WHILE DECELLING... Will read mid to high 16s until it warms up (five minutes maybe) than will usually read 17.7-18.0 until it gets REALLY warmed up (hard driving) when it will read --- (full lean)... Prob just need replacement o2 sensor? I really doubt the controller went bad
05-09-12, 07:56 PM
#24
.. I have an old Sun dwell tach i could wire into secondary injector wires... It would output in a 0-90 scale (which can closely represent duty cycle)... Hmmm
Here's how you do it...*http://www.gassavers.org/showthread.php?t=7714
Here's how you do it...*http://www.gassavers.org/showthread.php?t=7714
05-09-12, 10:18 PM
#25
... Confirmed primary & secondary injector signal out of ECU using dwell meter.. Simulated load by disconnecting TPS and plugging pressure sensor vacuum line than reving to 4k rpm.. Secondaries started firing a little over 3500 rpm
Anyone actually running some similar to my setup WITH a wideband?
Anyone actually running some similar to my setup WITH a wideband?