Today I made three logs on my stock Evo 9. I was logging on CA 91 octane 76 gas. Two things jumped at me:

1. The car knocks even when stock on 91 octane gas. The knock is about 6-7 counts from about 5500 rpm on. About 2 degrees of timing get pulled when knock happens. This car is not supposed to run on 91 octane gas even when it is stock. IMO even those who have a stock car should get it tuned to run properly on CA 91 octane gas.

2. I calculated IDC and it is 100% or higher. Is that normal on a stock Evo 9? This happens at 7000+ rpm when I believe the car becomes extremely rich. I have noticed that when I logged another Evo 9. For some reason the 9s go really rich @ 7000+.

I ran the log in DLL with the temp/baro/humidity included and the car put down 261 hp and torque.

 

how much boost?

 

It is in the log under JDMMAP. It is about 19.4-19.7 peak and then tapers to low 15s high 14s by redline.

 

Pretty normal. The stock 9 tapers so much up top and runs a bit rich, not as rich as 8's but rich. It also has a "IPW step" at 7,000 rpm where the IPW's fly up a bunch. This is directly related to lean spool.

If you don't want to get rid of lean spool you can move this up to something like 7,800

 

Of course it knocks, your running 91 octane. With poor grade fuel it's almost as if the car was designed to knock itself into low octane maps.

I bet your looking forward to that 100 or so whp available with trivial mods/tuning

Nevertheless, congrats on your first log with the IX, wish I had one. I think I'll wait for the XI in 2010 though

 

I have seen quite few stock cars stock map even on 93 knock about 4-5 times

 

yup stock evos will show knock even with 93 octane. Todays engines are designed to actually run with some knock. Its not damaging at all. If you start to see 12 knocks then that definetly isn't normal. Dont pull your hair out trying to get 0 knock free unless you want to get a nervous breakdown!

 

nj thats good that you logged the stock 9 congrats on that...
so the 8 knock counts is pretty normal then uh??

 

+1

the IXs go real rich up top. Like bryan said, it relates to lean spool.

I turned my lean spool off by making the on and off rpm 1500

Oh yeah, later IXs never really hit factory boost (20.3lbs~16lbs)

 

Its not that hard to get a 0-1 count map. Kreionic and I are running knock free at 24.7+psi boost on 93 for him and 92 for me.

Its all about forethought and knowing what will and wont work to begin with. For someone with limited experience with a4G63 or turbo motors I can see how it could be hard. But if you can log and see knock its really easy to see what the timing dropped to, compare it to where you have it mapped and change it to what it went to anyway. In my experience it seems the ECU will pull an extra degree when you ride the knock control, that you can get away with if it wasnt to begin with.

 

no doubt, it's all about the tune, I had one customer that wanted to be dialed in on 91 octane california gas and he's running 25psi knock free.. of course he can't run much timing but it's showing ~350awhp in DLL. He's going to lower the boost to 21psi and we're going to adjust the timing and fuel to make the most of it. It should be interesting to see what kind of power we can make like that.

 

I actually tell people this all the time. I have seen dozens of instances where guys with very little experience, get irate at tuners after they log their own cars some time after a tune, and see knock.

Its unavoidable to get some small amount of knock, large amounts that affect the tune are where you have to be really concerned.

But even getting 0 counts on the dyno, doesn't mean its knock free while driving, I think thats where the huge misconception came from.

 

I guess your speaking about yourself with the limited experience. Why richen up crazy and pull timing crazy to get 0 knock and loose SO SO much performance. Sure your running 24 psi, but dont do no good with horrible timing. HIgh boost does not mean faster. A few 2 knocks here and there is NOT damaging the engine. Race engines are designed to actually knock some man, 100% safe.

 

11.3 AFR's, 3-4* at peak torque, 25 psi no knock.

Next time before you run your mouth read what is actually posted. I wasnt insulting you, I was making a general statement. I have actually still managed to run 6* at peak torque in some questionable atmo conditions at 24.5/25 psi. The load peaked out at 285 on the stock turbo (low for what I am used to seeing with it). Even with my Green I run almost the same timing I did at the same or more boost on pumpgas. I have even run more on pump without knock and still managing to run 1-2* timing at peak torque.

 

So I do this by changing the Boost Enhancement (Anti-Lag) Stop RPM from 4531 to 7800 rpm? What impact would that have on the AFR from 4531 rpm on? I suspect the AFR will become leaner. Correct?