RB25det NEO 6 MAF issue or fuel pump problem? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

drugsbunny · 07-15-2010, 01:12 PM

I was using the stock ka24de fuel pump on my rb25det. When i tried to drive the car i couldn't go past 2mph. the throttle just stopped responding. Sooo i decided to upgrade the fuel pump to a walbro 255. Now i can at least hit 25mph. Im using a rb25det maf. it has a pink sticker on it. Im not sure what the problem could be. i already adjusted the TPS sensor.

iwannaslyde · 07-16-2010, 09:41 AM

im having this same issue with my KA-DE. ive got the walbro 255, but my engine bogs down after about 25% throttle and wont respond unless i keep it under 25%. i have to inch through each gear until i get up to speed...super sucks. ive changed out the fuel filter and Coolant Temp Sensor...next up is the MAF...idk if that might help since ur using the RB Maf...from what ive read by searching, it usually ends up being the Maf

drugsbunny · 07-18-2010, 01:07 PM

Yeah i think its a MAF problem. I used my ka24 MAF on my neo6 engine. and i cant go past 2mph. The neo 6 uses a different maf then the rb25det. the neo6 uses a 2.0volt maf and the rb25det uses a 4volt.

drugsbunny · 10-27-2010, 01:39 PM

turns out the wires going to the MAF were to think and it was throwing everything off, to much voltage going in. I put the correct wires and the car runs great!

steve shadows · 10-28-2010, 03:00 PM

This rule of thumb is worth the money and will save you a lot of headache...

1. Make sure if you are using factory ECU that you have factory MAF to match (be 100% sure on this). If the motor shop you got the set from didnt provide you with this then get it...

2.If you are going to upgrade your MAF, go straight for PFC...if you want to go crazier than that then go to a MAP setup like HALTECH...AEM Is good but the fact that you can't use your OEM CAS wheel is eh...

Through years of nightmares with MAF issues and all kinds of crap I realized these two rules will save you a lot of trouble and headache and are well worth the money...

07-15-2010, 01:12 PM	#1
drugsbunny Leaky Injector Join Date: May 2010 Location: Chicago Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	RB25det NEO 6 MAF issue or fuel pump problem? I was using the stock ka24de fuel pump on my rb25det. When i tried to drive the car i couldn't go past 2mph. the throttle just stopped responding. Sooo i decided to upgrade the fuel pump to a walbro 255. Now i can at least hit 25mph. Im using a rb25det maf. it has a pink sticker on it. Im not sure what the problem could be. i already adjusted the TPS sensor.

10-28-2010, 03:00 PM	#5
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	This rule of thumb is worth the money and will save you a lot of headache... 1. Make sure if you are using factory ECU that you have factory MAF to match (be 100% sure on this). If the motor shop you got the set from didnt provide you with this then get it... 2.If you are going to upgrade your MAF, go straight for PFC...if you want to go crazier than that then go to a MAP setup like HALTECH...AEM Is good but the fact that you can't use your OEM CAS wheel is eh... Through years of nightmares with MAF issues and all kinds of crap I realized these two rules will save you a lot of trouble and headache and are well worth the money... __________________ Like Me on FaceBook !

07-16-2010, 09:41 AM	#2
iwannaslyde Zilvia Member Join Date: Jan 2010 Location: Kissimmee, FL Age: 37 Posts: 224 Trader Rating: (0) Feedback Score: 0 reviews	im having this same issue with my KA-DE. ive got the walbro 255, but my engine bogs down after about 25% throttle and wont respond unless i keep it under 25%. i have to inch through each gear until i get up to speed...super sucks. ive changed out the fuel filter and Coolant Temp Sensor...next up is the MAF...idk if that might help since ur using the RB Maf...from what ive read by searching, it usually ends up being the Maf

07-18-2010, 01:07 PM	#3
drugsbunny Leaky Injector Join Date: May 2010 Location: Chicago Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	Yeah i think its a MAF problem. I used my ka24 MAF on my neo6 engine. and i cant go past 2mph. The neo 6 uses a different maf then the rb25det. the neo6 uses a 2.0volt maf and the rb25det uses a 4volt.

10-27-2010, 01:39 PM	#4
drugsbunny Leaky Injector Join Date: May 2010 Location: Chicago Posts: 73 Trader Rating: (0) Feedback Score: 0 reviews	turns out the wires going to the MAF were to think and it was throwing everything off, to much voltage going in. I put the correct wires and the car runs great!