benderrodriguez

iTrader: (26)

For guys running an EMS I know it doesn't display counts of knock in the log but rather knock sensor voltage.

So how much is too much? I hit about 2.5v at the top of the spike.

EVO8_PR

iTrader: (5)

What boost and timing at that point?

benderrodriguez

iTrader: (26)

I think about 25 psi and 6 deg timing

93octane

benderrodriguez

iTrader: (26)

Any thoughts?

itzwolf

iTrader: (9)

Stock or built engine? I've seen more than that on built engines regularly, especially when making power.

My engine when it was stock sometimes made a little noise up top and I typically dont see much of a concern until its getting in the 3+ volts areas in the mid to high rpm areas. You can usually tell when its knock, try taking a bit of timing out and/or lower the boost a little and see if it goes away. A sure way to tell is some high octane fuel...

There is a Supra I've tuned that the engine is very noisy and pretty much has a regular noise baseline over 3 volts all the time. This is with 93 octane, high octane, and even e85. Some engines are just loud when built and the car is highly modified...

TheBoz

iTrader: (9)

I have a few recommendations. I would switch to an internal log. This will give you more resoution.

http://forum.aempower.com/forum/inde...c,23911.0.html

As for knock, you should always do a baseline pull, to establish what your normal engine noise level is. Alot of the time as boost goes up the engine will generate more noise. If you have a noisy engine those numbers are fine.

The big thing to keep an eye out for are the big spikes in knock. When that happens, you might want to work on your timing at that spot and or a little before the knock event happened.

Big afr swings and huge timing jumps are the biggest cause for knock.

And to answer your exact question, how much is to much. Well, that depends on your engine build and it use case. I my built 2.0 my here is my knock table:

0.1171875 0.1171875 0.44921875 0.80078125 1.1328125 1.484375 1.81640625 2.1875 2.48046875 2.75390625 3.0859375 3.30078125 3.515625 2.5390625 1.7578125 0.99609375 0.99609375

browningderek

iTrader: (7)

my numbers in my knock cal table are similar to his.^^^^ built 2.3 here. agreed on the big spikes also. my rule of thumb is if you see higher spikes, take timing out there and see if it goes down. if so it was knock, if not, its engine noise.

THANGEVO

iTrader: (3)

I have this same problem I have a lot of mods like browningderek.Br 2.3 with stage 3 heads Hta3586 with shearer manifold,fpr4 cams.Id2000 injectors , coil on plug by sparktech ,and exedy twin disk hd,build trans by shepp...anyway at 20 psi I pick up 3.5 volt of knock at 6800 to 7200 rpm. Timing at peak torque at 4 and ram up to 8 degree up top rpm,running on E98 with A/f 11.8 to 11.3 up top or so I try and try to lower the timing to 4degree up to an down to 0 at peak and still pick up a lot of knock voltage I'm unexperien tuner so I was hoping to find help on forum here.to point me to the right direction so I can turn the boost up and keep the car in one peace,lol I'm my running to much timing or something I check my knock sensor and it not too tight .thanks.....

BillSpec

Its best to start a new thread with a datalog on the first post including AFR, ign timing, engine load, knock volts, and mivec if you have it. Possibly a screenshot of your fuel/ign maps if you are feeling frisky

Those are pretty low timing numbers for e98. Especially with a stage 3 head... what intake manifold?

oh ya. start a new thread

THANGEVO

iTrader: (3)

Stock manifold ported with Milspect throtle body. it non mivec it an 05 mr .running bpr8es plug gap 0.024 any more suggestion thanks

Aby@MIL.SPEC

iTrader: (161)

ALL engines behave differently, etc..

I recomend this:

For making a knock sensor profile, what you do is run a safe afr ~11.0 @ ~18psi boost & cut your ign timing in half. this way your going to be making some power, but your trying to be 100% not to knock...maybe put a splash of ms109.

set your internal logger to record @ 250sample /sec & be certain to record rpm & Knock #1 volts as FAST. I have my logger set up like this:
****Loop logging, load @ least 0.04, throttle @ 40, rpm @ 1500

do 3 WOT 3rd gear pulls from 2k to 8k. get that data from a internal log. what you do is you export that data from the log onto a .csv, plot it in xl against rpm, generate a rpm vs. voltage profile, *1.25 = your knock sensor profile. any voltage above that new value is considered knock for pump gas.

GL, aby

THANGEVO

iTrader: (3)

I had it dyno on Monday night and kept checking on plugs n slowly adding timing and checking on the plugs so far it seem to be just noisy motors so it end up making 601/525 torque at 31.7 pounds of boost and timing were like ramping up to 8 degree up top car feels great it break all wheels loose thanks again for all the help....

THANGEVO

iTrader: (3)

This was on dyno that read like 8 higher than Buschur mustang dyno what u guy think of the numbers and boost level does it seem alright ???