jrsimon27

iTrader: (1)

i wouldnt touch the timing tables at all! if you want to add more fuel to the base maps well thats fine but dont touch the timing tables unless you have a device to monitor knock!
i asked in another thread if i could zero out the timing tables for the 100oct maps but i would be using vp109 which has a higher octane just to be safe.

nj1266

iTrader: (6)

I have the knock buffer and it does not log any large spikes. I will get the Tactrix cable soon and I will be able to log the knock sum. That will give me a good idea about the timing. What I have noticed from the base maps is that timing is pretty safe. The timing on Shiv's 93 octane base map is slightly more retarded than the timing on my custom 91 octane map.

There is a sticky thread in this forum that shows you how to create a race map. It is pretty simple and is in line with what my custom 100 octane map has. You basically map the AFR a bit leaner, zero out the timing and set the boost to around 24 psi which is the maximum w/o the xede flash.

jrsimon27

iTrader: (1)

thanks nj yeah in the sticky forums it says that if you use race gas you ca zero out the timing table. what afr do you recommend to use for 109 racegas?

nj1266

iTrader: (6)

If it is for drag racing, then 12:1 on 109 is a nice safe AFR as long as your not knocking.

RazorLab

iTrader: (8)

Do you know this from experience or something you read?

nj1266

iTrader: (6)

Since I do not drag race, so it is something that I read about. This is race gas. jrs is currently running Shiv's maps at 11.7:1 on 93 or 91 octane. Do you think that 12:1 is lean for 109 octane? Crap, shiv has his maps @ 12.5:1 on 91 octane.

RazorLab

iTrader: (8)

I'm just saying be careful about taking other peoples writings as gospel.

nj1266

iTrader: (6)

I appreciate what you are saying, but I have been in touch with jrs through pm and know the AFR and the set-up he is running. Out of curiousity what AFR would your run with 109 octane gas?

RazorLab

iTrader: (8)

On my car, not sure, it hasn't seen higher then 100 octane. To be honest, I've yet to tune on a car on leaded gas.

nj1266

iTrader: (6)

What about the AFR you run on 100 octane @ the road coruse?

RazorLab

iTrader: (8)

11.5 to 11.2 @ 25psi peak (3rd gear)

It's a very safe tune however. Conservative timing for 100 octane. I could push it much more but since I don't car bowl, I don't.

Spec'd

iTrader: (16)

Any logs for us razorlab ?

Maybe just a mini one.

RazorLab

iTrader: (8)

I have a bunch of logs at home I did on the dyno. I can post tonight if I remember. I have since tweaked it a bit from then. It richened up on track after the car started running 100% 100octane so I had to lean it out a bit more.

Here is the dyno AFR, I since tuned out the small dip in the middle and a also made it a tad richer up top (11.2):

Spec'd

iTrader: (16)

Thanks for posting that.

I like nice conservative tunes even on 100.

I'm usually concerned about EGTs , even when knock
isn't a problem. I thought higher octane gas was
supposed to run cooler.

If that is true it sure doesn't seem to make a difference
in my EGT logs when comparing 93 to 100 octane.


Question:
Do you prefer dyno tuning over road tuning ?

RazorLab

iTrader: (8)

From my experience, dyno tuning on a good dyno easier, faster and safer to get a good tune, I always do both though. On the dyno to get it as close as possible, then tweak it on the street/track.