engine knock

[lindsey34]

help with decreasing knocking

I've got a R33 94 GTSt with a Power FC and when using the Power FC the knock levels are to high, i have yet to get it tuned so the Power FC is still factory set.

My commander shows at peak hold:

Ign timng 42 deg

air flow 4830 mv

knock 69

any help on getting the knock down would be good as it's a bit hard to get it tuned at the moment cos I live so far away from the nearest tuner and I'm waiting on getting a new turbo befor I get it tuned.

mods:

Power FC, HKS FMIC, HKS Pod, AVCR and 3" kakimoto exhaust with 3" front pipe.

running 98 octane fuel.

[meggala]

I woudl repalce the power fc till you get it sorted. engien knock can mean dead engine

they arent always safe even from the factory

meggala

[NRB]

I agree with meggala, but a knock of 69 is not "extremely" high. When does that reading occur?

[R33vit]

My knock was a lot higher than 69.. What I did was to pull timing from the whole map untill it stops... this will give you a good idea how much you will need to pull from the inj map later... Once you have worked out how much timing you need to pull set the base timing back to where it was, get a friend to drive the car and in map trace mode pause it when it is pinging...

Go to the appropriate map point in the ign map and pull some timing out at that point... It will take a while on the road so dont rush it... You can add fuel at the same map points to attempt to decrease knock..

I suggest you get a wide band o2 sensor and a A/F meter from say Jaycar.. (not the best tuning tool) but better than nothing... ( I will get flamed now)

I take no responsabilaty if you stuff your engine... This is just what I did to mine to keep it safe until I get a dyno tune at a reputable Tuner...

You can also try running octane boost as tha APEXi PFC is set up for 100 oct fuel until you get it tuned.. Its expensive but cheaper than a rebuild....

Other wise keep of the throttle.. We all know how hard that can be

[Blitz]

help with decreasing knocking

I've got a R33 94 GTSt with a Power FC and when using the Power FC the knock levels are to high, i have yet to get it tuned so the Power FC is still factory set.

My commander shows at peak hold:

Ign timng 42 deg

air flow 4830 mv

knock 69

any help on getting the knock down would be good as it's a bit hard to get it tuned at the moment cos I live so far away from the nearest tuner and I'm waiting on getting a new turbo befor I get it tuned.

mods:

Power FC, HKS FMIC, HKS Pod, AVCR and 3" kakimoto exhaust with 3" front pipe.

running 98 octane fuel.

So you are running a power fc which has been installed out of the box without ever being tuned?

If this is the case either have it tuned immediately or replace it with a factory ecu until you can afford to do so. The tune that comes on the power fc is a base tune only. Driving your car around on this tune is very dangerous.