I'm a newb to tuning, but learning as I go with much appreciated help from Razorlab and others.

Wot runs in 3rd gear look fine, afr approx 11.4 at peak torque, down to 11.2 or so from there on out. AFR's steady, no knock.

As I've begun partial load tuning, I've found a number of areas where I was getting more knock than expected. I'm aiming for afr's of 11.4 at peak torque down to 11.2 from there out anywhere above 100%load. In areas of rapid transition I've had to dramatically reduce my timing in order to get rid of knock. the amount of timing i'm running seems low compared to other peoples timing tables for the same load/rpm cell. I know all cars are different and there are different ways to tune, etc etc. but i was hoping someone could look at my rom tables and see if my timing looks reasonable or if they look really off and maybe something else is going on.

Car: evo 8, 91 octane gas with Torco race fuel concentrate. full 3" exaust, test pipe, works 269 cams, 720 cc injectors, Works 02 housing, WR turbo, tuned with ecuflash. Lean spool is off. Boost control via hallman mbc.

any comments or thoughts would be appreciated

 

Timing table is at link below. its saved as a word doc. rom is saved also as a txt document. If anyone can post it up in this thread, that would be great.

http://www.norcalevo.net/gallery/index.php?cat=10106

 

Hi

Just a quick look, firstly your low octane ignition maps are higher than you high octane maps, this is not a good idea as the ECU interpolates between the 2 when you get high levels of knock.

Your timing is very low for those areas, especially as you have cams. What boost are you running? You havn't listed an intake mod, is the intake stock.

MB

 

Running stock intake with drop in. Boost peaks at 23ish and tapers to 21. Load goes from about 230 to 260 to 230ish from 3500 to 7500.

?? I haven't touched the low octane maps... haven't even looked at them. I'll go back and look. I guess i should have been changing the low octane maps as i go also. As a general rule, how much lower (timing wise) should the low octane map be below the high map?

 

Timing low because of the al gore fuel the car is run on.

Never advance timing for knock or use MS word to display your maps

 

Personally I'd mimic the stock maps differential as a starting point. I don't see the point in using any less than the -10 in the stock maps though. The loads you quote match mine roughly for the bosst you are running and I'm running a bit more timing, especialy in the pert boost areas. How did you go about tuning the part load areas? Are you positive about the AFRs?

MB

 

Hoping the AFR's are correct. I'm using a zeitronix unit. As far as tuning the partial load areas - I really hadn't paid a ton of attention to them until I modded my rom to have the cel go off with knock.

I've been driving around looking for areas where I consistently get knock and then datalog those areas and retune. first do the afr for the targets I've set and then adjusted timing.

I'm not looking for every last bit of power, the car sees a fair amount of track time, and so i want a very conservative tune.

Maybe I'm worrying for nothing. about how much power do I lose running say 5 degrees less timing at 4500 rpm's at say a 200 load?

 

Does the part throttle knock happen mostly in 1st gear at low to almost no boost and does not change no matter what timing or fuel adjustments you make?

If so then problem may be from an external source like tranny noise or noise from the head. Knock sensor is more sensitive when engine isn't under load.

 

Thta's how I've looked at the part load knocks, I did several long drives with Mitsulogger, looked for the knock and took out a bit of timing.

What levels of knock do you worry about?
What AFRs do you run in the part load?
How are you getting the load cells? 2 Byte or calculated?

I know what you mean about not going for every last bit of power, my car is our daily driver and as such I don't want to risk any thing happening to it.

MB

 

For me and on my car it seems there is more power to be had by running a richer AFR and maintaining as much timing as possible. As an added bonus I feel better about having more fuel in there. I imagine things would change if I was running more than the 21 psi peak boost on 91 octane.

 

I am having trouble in the 90-120 load range from 2000 rpm to about 4000 rpm. Its improving as I'm slowly richening things up or dialing out timing so I dont think its false knock. I know that some knock at spoolup is ok, but it still bugs me.

 

I'm aiming for less than 3 counts of knock, anywhere. I'm aiming for afrs around 11.4 by peak torque and then 11.2 beyond that. Those are my targets anywere from a load of 100 or higher.

Load cells are 2 byte.