C6C6CH3vo

iTrader: (9)

I don't get this, maybe my ritalin script need refilling?

Same numbers work for me, I hit 16 degrees at 6300 rpm, run 25 psi on pump gas and get, at most, 1 count on one to two occassions. Timing doesn't pull untill I hit potholes . Nonetheless, Some fish contain that omega oil that supposed to be good for you

jcsbanks

I wonder what 9 degrees at 3500RPM and 25 PSI would do on pump without any water or methanol injected

Looks like the car in the post was running 5 degrees on probably less boost when the map had 9 degrees. When your knock sum is greater than your ignition timing except for just as boost hits then things are probably not ideal.

The profiterole surprise would only occur if you expected chocolate and cream and ended up with fish. Imagine the anticipation and then... the disappointment.

SloRice

iTrader: (8)

^^in my case it knocks.

What are a standard AFR that you guys shoot for? 11:1? 11.5:1?

jcsbanks

Sorry, edited after your post.

Low-mid 11s is ballpark for pump at sensible boost levels at least on typical light mods on UK 98 RON (like 92-93 PON).

C6C6CH3vo

iTrader: (9)

Good thing I got a flow sensor installed - just incase it fails to sprayOr that first bite of frozen mayonaise in a waffle cone when thinking otherwise

SloRice

iTrader: (8)

Well, we turned the boost down to 21psi and did another pull and it still knocked like crazy.

So, I took the crazy 9's and turned them into crazy 8's and that made it much happier. But there were a couple areas that showed 2 counts of knock. One right at peak torque (3800-4400RPM) and another one at 6000-6500RPM. So I dropped timing down to 7 at peak torque and dropped another degree of timing in the 6-6.5k area.

Then to work on the AFR's as they are a little rich right now (high 10's).

jcsbanks

You need to know octane number here. I bet it was not 255 or 100% in the original log, but it would not make any difference if the low and high octane maps were the same. The ECU is running closed loop to get the knock sums in the 4-5 area using the octane number. You need to work with the ECU's knock control...

You're better off starting from a bone stock map rather than this mess.

SPIN2GST

iTrader: (29)

It's Sunoco 94 octane......the log showed 100 octane throughout the rpm band at wot.

jcsbanks

I should point out that if the low and the high octane maps are the same, then whilst it can still retard, it won't learn and it will have to have excessive knock sum every time. It would be nice to let it learn from its mistakes.

You're getting it sensible then if the octane value is pegged at 100, if the knock sum was 6 or more on the original log it should have been gradually decrementing the octane value. It is still worth making sure it has low octane maps to fall back on.

SloRice

iTrader: (8)

so what you are saying is the "octane" column will tell you which fuel and timing map the ECU is using? So if it say 100 in the octane map, then it is using the high octane fuel and timing maps. What will it say if it's using the low octane fuel and timing maps?

PVD04

iTrader: (23)

It will show a number less than 100. The way it works is:

100 - High Octane Map

50 - Average of High and Low Maps

0 - Low Octane Map

It basically interpolates between the two maps using the octane number. As an example, if your high octane map were to show 8*, your low showed 3* and your octane number was 80, your timing would be 7*.

-Paul

jcsbanks

Also does the same with the fuel maps. And it also has some influence over the boost if you get it down to 60-75% if you are using OEM boost control.

SloRice

iTrader: (8)

Alright....I have another n00b question.

The map I made yesterday afternoon, the car ran great on. 1 counts of knock and a couple 2 counts. I also took the low octane fuel and timing maps and added some fuel and took out 2 degrees of timing.

Did another log last night (same map, same boost pressure, etc) when it was cooler and the log knocked like crazy! The Octane started out at 100 and went to 96 by the end of the run. But timing was still being pulled quite a bit. The car has Buschur's manual boost controller, so I'm sure that has a little to do with it, as compared to running the stock boost solenoid and tuning in the map.

Looking at the log from yesterday afternoon and the log from last night, peak load from the afternoon was ~260 and peak load from the night run was ~275.

The map is only scaled up to 260. So would it be good to scale it to 300 and then take the timing and fuel values in the 260 column and leave them the same (since it ran well) and then take the timing and fuel values in the 280 and 300 column and pull a degree and add a little fuel, so that if it does get into those columns at night when it's colder, it won't knock.