EvoBlues

I seem to have quite a bit of knock in many different scenarios.
- When in neutral knock seems to happen between 2500~3600 RPM
- when just driving around with no boost, seems to happen 2100-3000 RPM
- when adding boost, seems to happen from 2500+

A few things you should know
- I just put the car back together.
- I set open loop settings pretty low because I was not getting feedback from the O2.

Any help would be appreciated. I'm not asking for anyone to tune. just to assist me in learning what I'm doing so wrong.

attached is two logs, one of revving the car a bit in neutral to see if knock was happening with or without load. and one was driving around earlier and i decided to give it a bit of boost.

- Brandon

eff

I had a quick look to the ROM-tables. So it seems you don't use alternative maps. But when you look at the Hi octane Ignition map, the Alternative Hi octane Ignition map and Launch Hi-octane ignition map, they are extreme different. The alternative map seen to be by far to agressiv, I would not use it whith our 102 octane petrol here in Germany. The fuel maps seem to be ok. Have you sorted out any reason for pseudo knock, e.g. loose spark-plug? So if you like to see my maps with nearly 0 knocks , send P.M.

eff

4b11slayer

Probably phantom knock.


Did you remove the knock sensor when you had it apart?

mines5

Before you get into ROM changes check few things.
Some thing which is resonating in the engine bay, loose exhaust system and broken foundations even loose bolts.

In my opinion your knock tables are set up for stock turbo+cam car.

Change your Knock Load table values higher according to your boost threshold.

Do the same for Knock Low,Mid, High rpm tables.

Klaiceps

iTrader: (18)

Try dumping in a few gallons of race fuel and do some logging. If knock is still present then it is more than likely phantom knock. Before you do that though make sure nothing is loose and banging around the engine bay.

EvoBlues

Eff, I will probably have a few more tuning questions when i completely rule out something mechanical. Before I took the car apart I also had 0 counts of knock.

4b11Slayer, I did not remove the knock sensor when I had the car apart.

mines5, I am looking the car over again, I think, I may have the intake cam off a bit.

Klaiceps, before I go the race fuel route, Im going to triple check the head...again

Thank you for all the replies. I am going to be taking a look at the intake cam.

There is a noise coming from the valve cover on the intake side. I have a feeling my intake cam valves are tapping my cylinder. I think my intake cam maybe one tooth retarded.

I have read two different things when it comes to timing on these cars.
1. Dowel pins straight up at 12 o'clock
2. Line up dowel little marks on the cam gears with marks on the valve cover.

opinions? Would one tooth retarded cause such high knock count ?

Thanks

4b11slayer

If your timing is off then set it right bro.

Yes timing being off can cause ignition issues.

EvoBlues

when you line up your timing. Do you aim the dowel pins straight up. Or use the timing marks ?

I found this while searching the forums.
How many nobs are in-between your timing marks ? I had 17.
Im going to try advancing the intake cam a bit, ~3 degrees and then tightening the tensioner to see if it moves where its suppose to be.

4b11slayer

You line both cam gears to the valve cover and align the crank at tdc mark.
Also the balance shaft on its timing mark.

Note: the balance shaft is a counter weight so it can be on time but 180 degrees off. You need to set the balance shaft. Spin it and let the weight. Bring it to the timinf mark. Spin the balance shaft and its either on timing because your holding it there or because its own weight brought it there. Youll know when its timed when you spin it and it moves on its own to the mark. If you spin it and it wants to movw on its own its wrong.

Play with the balance shaff spin it a few times. Youll notice on 1 spin it will wana keep moving. Then the next spin. The counter weight will set itself to the timing mark. Thats were you wana set it.

mines5

I ran Intake cam -3 with adjustable cam gears, didnt ran into knocking or resonation issues.
However, when i installed JUN cams on stock springs the car picked up knock.

Dakota Evo

timing seems to be way off and too squared

EvoBlues

The car has factory Evo 8 cams, GSC valves, GSC beehive springs and retainers.

I think the problem might have been, I lined everything up and then tightened the tensioner and I think the tension might have pulled both cams back a few degrees.

We will see on this next go around...