A'pexi Power Fc

[Midnight R33]

Hi guys,

I have just gotten my hands on a used Power FC for my series II and it has been already tuned to a Skyline with similar mods. So i have put it in just to test that everything is working ok.

My question is to those of you running a Power FC what is a safe knock level? I haven't

driven the car too hard because of this. And also not knowing who tuned it.

Oh and don't worry it will be re-tuned once i have the turbo upgrade.

So any one who can help, i'm all ears!

[Spook's_Skyline]

id be getting nervous if u regularly saw knock above 40

[HR31DRFT]

CHASING A POWER FC IF ANY1 GOT 1

[paulr33]

have a read of the faq in my signature, 40 isnt too bad but you should get it checked if its happening often under the same conditions

[Kennedy]

The warning light/engine will come on for levels that exceed 50.

[Midnight R33]

Thanks guys. Well it hasn't been anywhere 40 yet. There's just not much point having a gauge

or meter in your car when you don't know whats good and bad .

I gave it a bit of a stab the other day on lower boost and it shot up just over 30.

So that kinda freaked me out not knowing if that was ok or if i had just hurt my car.

[khunjeng]

not always a definative thing the knock reading....Just look for consistant reads say above 30-40 if this is happening then I would get your tune looked at. If your running under 20 all the time with an occasional hic-up I wouldt be too stresed.

[NYTSKY]

0-40 is safe.Ive had higher knock levels.But with a good tune it will be all sorted.Also its a good idea to run your car on 98octane.

[Birnie]

The warning light/engine will come on for levels that exceed 50.

The warning light/engine will come on for levels that exceed....whatever it is set to.

I actually thought the default was 60 but you can cahnge that to anything you want :sorcerer:

[Risking]

Your asking for trouble if your running a previously tunned ECU in any car without at least a power run or SOME type of lambda check up!!!!

Knock is ony half the equasion. I lean tune cando the same ammount of damage that detonation will.

[Topaz]

Remember to reset the knock counter after starting the car.

When I start my car, more often than not I will see a knock of 80. But if I reset, drive, stop I rarely see a knock over 12

[Risking]

12 is too low really. If everything is working fine I like to tune into the low 30's. Obviously depending on NVH etc every car is different and as such the knock meter on the FC cant really be gospel.

Srewed up piston to bore clearances etc etc can contribute as well

There is no substitute for physically listening for detonation OR a proper knock box.

Edited March 12, 2007 by Risking

[Midnight R33]

Thanks guys for all the input. It all helps.

Like i said i will not be using it till i have the rest of the car ready for a tune. But i have half a mind to leave it in. Just this past week i have noticed it runs twice as good with stopping and going around town then the factory ECU ever did. It doesn't seem to be any more savage on the fuel side of things either. But yes i am also cautious about the air/fuel ratio.

[JustinP]

I put my PFC in a few weeks ago, and I am due to get it tuned in the next week or so. I was trying to really drive it like a granny because the knock reading was really bad (hope I haven't damamged the engine!). Even though I was trying to use less than 25% throttle and even less up hills and on hot days, I hit 203 once! And 120-130 a couple of other times. Never really heard any pinging though.

Anyway I just turned down the boost to 7psi and it is now drivable again with reasonable knock levels (stays under 25 mostly). Can't wait to get it tuned though so I can crank the boost up again, it feels so slow now.

[Blitz]

I put my PFC in a few weeks ago, and I am due to get it tuned in the next week or so. I was trying to really drive it like a granny because the knock reading was really bad (hope I haven't damamged the engine!). Even though I was trying to use less than 25% throttle and even less up hills and on hot days, I hit 203 once! And 120-130 a couple of other times. Never really heard any pinging though.

Anyway I just turned down the boost to 7psi and it is now drivable again with reasonable knock levels (stays under 25 mostly). Can't wait to get it tuned though so I can crank the boost up again, it feels so slow now.

So you installed your Power FC and you have been driving around on the base map?

Reallly not a smart idea.

[Kennedy]

The base map rocked for mine. When I eventually did get a tune i only gained about 10RWKW at the top end. (Hitman) but I do use 100RON V power racing fuel.

[JustinP]

So you installed your Power FC and you have been driving around on the base map?

Reallly not a smart idea.

As I said I was only on about 25% throttle, and I monitored the knock reading constantly. A couple of times I did push it a bit too far which was silly. Now that I have decreased the boost a bit I think it now is running better than ever so the base tune can not be that bad in this case any way. Anyway I just can't wait to get it tunes, but have not been able to yet as I have had to do several other things to the car first.

[Guilt-Toy]

reset the ecu and use the stock maps. it should not go up so high then.