phil21191

As the title really, impatience and excitement lead to me never bothering to set base timing when I fitted megasquirt 2 years ago.

I finally bothered to set base timing today and found spark to be retarded 3.5 degrees and called myself stupid. This is what I thought my spark table looked like


But it actually would have looked like this



So with that in mind how much power is 3 degrees of timing really worth?

Its a 1.8 NB, WRX TD04, 2.5" exhaust, eBay intercooler , 20% methanol premix with 99RON. At a guess based on 111mph trap speeds at the 1/4 mile what you guys would call 270-275whp

18psi

iTrader: (76)

probably 10-20hp

Lexzar

iTrader: (2)

At least you weren't as bad as me

phil21191

Only one way to definitively know, but 1/4 trap speed in a weeks time will give me an idea


Whats the full story?

18psi

iTrader: (76)

111 is already solid, so you're doing good either way

phil21191

You were on the money 18psi

Visited a Dyno today. Baseline with the old spark map. Final run with the additional 3.5 degree timing, but with 10kpa pulled from everywhere below 6000rpm




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ridethecliche

iTrader: (2)

To clarify, were you running 10 kpa lower with the 'fixed' setup up till about 6k? Thanks for the data, this is pretty cool.

Do you have spool data by any chance as well?

phil21191

Original boost target was 180kpa until the 5000rpm 190kpa 5000-5500 then 6000-7500 200kpa

Revised boost targets are 170kpa to 5000, 5000-5500 180kpa, 5500-6500 190kpa, 6500-7500 200kpa

Its been a long time since I did a 4th gear spool test, but IIRC it made 12psi by 3000rpm with a 5 Speed and 4.10 rear end