JZA80 Apexi PowerFC with Sard 1000cc injectors problem, HELP!

**Sicarius123** · 01-12-2006, 10:55 AM

My Supra is all back together from my recent buildup but now we just can't make it idle at all before taking it to the dyno for tuning. The Apexi PowerFC and SARD 1000cc low impedance injectors don't seem to like each other.

Now since the PowerFC is designed for JDM high impedance injectors, we've wired in a Skyline GTR resistor pack to bring the high impedance 14ohm signal down to the low impedance 2ohm, and I know there is no issues with the 12v fuel pump conversion as I've had them in there for two and a half years now running fine.

The injectors aren't opening enough and are barely squirting, the injector pulse is really weak although we've been told by the distributor it is meant to be weak, my mechanic still thinks it should be stronger.

Current round of mods have been battery relocation to the boot, Virtual Works intake manifold with mustang throttle, Greddy 4-row, Sard 1000cc injectors in a HKS rail with SARD fuel pressure reg, and Skyline GTR resistor pack.

Any ideas besides "buy a new ECU" would be greatly appreciated.

Thanks in advance.

Dan.

**kingmick** · 01-12-2006, 11:33 AM

your running 1000cc injectors and no after market ECU? No offence ment, but if you are chasing that sort of power, your mad not having an autronic or motec ecu! if your going to all this trouble a few extra grand is well worth it.
Mate, i said buy an ecu because you are making it so you have zero saftey! if you had a small upgrade on injectors etc it would be ok, but still a bandaid solution!
You have gone this far, be patient and save for the ecu or it could cost you twice what the ecu will cost and your back to square one.
Yes there is a solution for what you need if you looked into it, but i for one wouldnt be giving to you because i can see the grief that will come from it.
Bodgy can work at times, but you shouldnt be bodgy with the money you have spent!

**Sicarius123** · 01-12-2006, 11:36 AM

I have zero safety? I'm sorry, I consider having an aftermarket ECU designed to keep all the safety parameters of the stock ECU as having safety.

Exactly which department of Toyota released the PowerFC Pro? There are plenty of people using these ECU's in big number cars and daily driving them. Seems aftermarket to me, also a full replacement, not piggy back.

Dan.

**kingmick** · 01-12-2006, 11:51 AM

it go boom! lmao and how many race engines do you think run power FC? wonder child!
Your engine, do what you have read on the internet

yes zero saftey, if the bodgey wiring drops an injector your stuffed! so zero saftey because you dont have an ecu that will have a chance of saving it, its hard to save them with the best of the ECU's, let alone an FC.
But its your choice, and i wish you the best of luck and a long engine life!

JP · 01-12-2006, 11:53 AM

There was a couple of posts on the datalogit yahoo group about using 1000cc injectors with the Supra PFC, basically a guy asking if they would work, which was then responded to positively stating the autobarn supra is using that same setup.

What settings have you changed from default for the 1000cc injectors so far?

Are you using a datalogit?

**kingmick** · 01-12-2006, 11:56 AM

There you go ring autobarn, they will know!hahahahahahahahahahah

**RONA** · 01-12-2006, 12:05 PM

Mick this is the Tech and Conversions sections, if you aren't going to help him don't post in his thread

.

Ideally he'd be using a better ecu yes, but he isn't and he has already spent good money on his current one and thus doesn't want to bin it.

Not everyone has the budget to just throw 3-5K at an ecu and as can be seen this is the latest series of mods suggesting he is building the car as money allows, so whilst alot of money has been put in, its been done over a couple years period which lessons the sting.

Sorry for going offtopic Sicarus123 and best of luck getting it running.

**kingmick** · 01-12-2006, 12:13 PM

yes i was helping in the only way i can see that will keep it alive for an extended period! When 1000cc injectors are involed it isnt a standard deal! you will be upping the idle to stop fouling plugs etc and to get it to work well and do what is wanted with the power that you are after with 1000cc injectors,you need to be careful!
Id rather someone have fun for the longest time possible! not do there money

**manny** · 01-12-2006, 12:58 PM

Dan
Not quite as large, but not far of it, but my Power FC is running 800cc injectors (without resistors) on my 1.5JZ setup and it idles perfectly on stock cams and pretty close to perfect even on 264/264 cams.
Over the years, I've run 380/440/550/650/800cc injectors without issue on the Power FC although only the 550cc ones ran a resistor pack to match impedance. They all idle in a similar fashion and you'd be hard pressed to pick a difference from stock.
My duty cycle is about 1.0-1.5% at idle and I've been able to lean it off even more in testing, so I don't see why it wouldn't run 1000cc injectors.
In your Power FC settings, have you verified your injector offset % is correct as well as your latency? Have you got 02 feedback enabled for closed loop idle/running? Are you running a wideband to check mixtures?
You've probably done so already, but doublecheck your wiring.

**Sicarius123** · 06-12-2006, 11:50 AM

MIssed all this, didn't get an e-mail response after the first one sorry guys.

Basically everything has gotten out of hand and I'm having the car towed home. Will be able to check out everything myself on the weekend, but with everything they've added to my bill in terms of labour to get it working, I wont be able to afford to tune it for a few months.

Definately sucks

Dan.

**Sicarius123** · 07-12-2006, 10:22 AM

More bad news, they billed me another 2k and decided I've been screwed by my work at the same time.

8 weeks wait on a Toyota resister pack to replace the GTR resister pack.

Dan.

**chris davey** · 07-12-2006, 10:25 AM

what do you mean "build gone bad"? If they had it and it broke, I would think it could very well be their fault

**Sicarius123** · 07-12-2006, 10:37 AM

Not going into any detail until the car is back in my driveway.

Dan.

**Joshstix** · 07-12-2006, 10:44 AM

Originally Posted by kingmick

your running 1000cc injectors and no after market ECU?

Mick the Power FC is a full programmable aftermarket ECU. It's not like he's trying to use an AFC or some kind of sensor bender.

I only have 850cc injectors in my 3S but the power FC runs them quite nicely.

**mrshin** · 07-12-2006, 08:44 PM

Be a little more careful with the resistors - actually measure the resistance, and work out the current. You need to let enough current through to actually open the injector properly, and this is somethng that using resistors (especially just randomly selected ones!) isn't too good at.