sr20 will not go past 3k rpm with power fc

[joefresh]

Been searchingfor a few hours and cant find an answer.

Just did the power fc initialization on my S14 engine. After learning the idle i tried to take it arounxthe block but it wouldnt rev over 3k rpm and begins to breakup. Limped it back in the garage and cant even spin the motor over 3k in nuetral.

I Plugged in the stock ecu and it runs fine. My setup is a zenki sr with 260cams and an aeromotive fuel pump. Injectors and mafs are stock.

I have read several threads with people having similar issues but nobody switched back to a stock ecu or really had any real solutions. Any advice would be great.

[Beemer]

Did you turn off the boost controller option? Do you have a wideband gauge to monitor you afrs? That would be a good thing to get if your going to play around with ecus. Does the check engine light flash when you rev it up to 3k?

[joefresh]

Boost control is off and i do not have a wideband. There is also no CEL. I am not trying tp tune the engine or anything right now i just recieved my powerfc and wanted to make sure it works.

[FourtyKid]

Sounds like you're in Safe Mode. Are you getting any error codes from the ECU?


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[ShadowMan]

You need to get a Wideband pronto. The pfc comes with a base map, basically so you can get it started on the dyno and start tuning from there. You really shouldn't be driving it around on that map. Is there black smoke coming out the back? If there is, and I bet there is at least a little, then your running rich. But you need at least a wideband to know what your AFR's are doing. If you plan on doing this yourself, might as well invest in the datalogit. It will make things much easier using a laptop to correct multiple cells at a time, instead of using the commander going one by one. Also, keep a ready supply of spark plugs and a gapping tool on hand as they are a great indicator of what each cylider is doing and your bound to foul a few up in the beginning. I belive .32 would be a good starting gap, but this is debatable. Steve Shadows usually jumps into these PFC threads to give his insight, or you could message him. I would also say to get a fuel pressure gauge (like $50-$75) to make sure your fuel pressure is adequate and correct. Good luck, and be careful. You wouldn't want to have to rebuild your motor because of impatience.

[kota2240]

sounds like settings on the PFC are not set correctly cause it might not be reading your MAF which will cause it not rev past 2500-3000rpm or it has the rev limit set to 3k

[joefresh]

I dont think the powerfc has a safe mode. Im not driving the car like this so i dont see how a wudeband will help me since im not tuning anything. Its a stock sr stock maf and injectors. I have a z32 maf and 550s here for a tune but wanted to check my new powerfc on the base map which should run the same as stock according to powerfc faq.

[ShadowMan]

Do you have it set on the right maf? Check to see what its set on and make sure it's correct.

[lbkid180sx]

check spark plugs

[joefresh]

Maf setting is on standard s14. Car ran fine on stock ecu after breaking up on the powetfc so i dont think spark plugs are an issue

[aga]

is your wiring stock , or conversion? i have an s14 engine on a s13 200sx, and the car was kinda working with a mine's ecu, with power fc it wouldnt even get power to the ecu. the wiring was shit, we redid it all, and everything worked fine. the power fc is VERY choosy about wiring...

[joefresh]

It is a converted harness into a us spec chassis. Is the powerfc more sensitive than the stock ecu?

[aga]

keeping in mind that the mine's is a stock ecu with a daughterboard, then yes. my car was driving around with the mine's , with the power fc it wouldnt even power up the ecu. the ecu has at least 3 power lines, and a lot of other stuff too. the wiring must be real good. of course not EVERYTHING is needed, but the things that are, must be well wired.
i hope you know a good electrician.

another thing i ran into, just in case you meet it as well: the stock wiring has an ECCS relay, which is not necessary in order to run the car normally, but in the case of the power fc, its got to do with keeping the power on the ecu after you ve switched off the ignition, that's when the ecu saves its data. you should notice the commander switching off like 1 sec after you ve turned off the key, thats cause it saves, then gives the signal to the relay to turn itself off. my car was misssing that too.

[Kriskouki]

Re-initialize the Power FC again.....And, re-do the learning process again.....I had the same situation that when reving past 1.5K rpm, it seemed that I really couldn't go more.....But, after I re-initialized it and re-do a learning process again, everything went fine now....I am now driving my car on the un-tuned power FC and everything went okay......

[ShadowMan]

Just so I'm clear here, seriously not trying to be an ass.
-Car runs fine on stock ecu all the way through the rpm range
-with PFC it breaks up and stumbles after 3,000 rpms
-maf is stock and pfc is set for that
-injectors are stock and you haven't played with the injector map
-the cams are 260's which the stock ecu ran just fine
Is all this correct?
Have you tried checking the timing yet to make sure the PFC is reading what your motor is actually doing timing wise?
If not, this is very important to do. Then make some changes on the timing map and check it again with a timing light to ensure the PFC is making the changes you tell it to. If it doesn't, it's a sure sigh that something is amiss with your wiring. Download the FSM if you haven't already so you know what pins on the ecu harness are what. Then just make sure the PFC is getting what it needs from the motor. If it runs fine on the stock ecu and like shit on the PFC, then my guess would be 1) it's not wired up properly and 2) your injector map and timing map need some tuning. The Base map is not meant to run the car like the stock ecu, I don't care who told you that. Apex even says that it's not. I have a PFC running my hatch with an s13 blacktop and have been slowly learning this process and I strongly suggest you start figuring out how you're going to tune it. You said you already have a z32 and 550cc inj's. Might as well make sure the PFC is wired in right, then install your extra shit and get to tuning. It is inevitable that a tune is REQUIRED, so just get with it.

[steve shadows]

Send me an email [email protected] I can help with this ASAP :cool:. Thanks!

[slow92]

I had this same issue with a power fc on my sr. The car would run fine on stock ecu but wouldn't rev with power fc. I sent it to Apexi Japan and some how water or fluid had gotten inside of the computer and they had to fix it.