hi, i have a built evo 5 setup that is running 6765 turbo. i want to tune it myself but just wanted to know that i have read in many threads that ignition timing on peak torque should be around 0-5 degrees max running 93 octane. now my question is that smaller turbos spool up around 4-5k rpm and 6765 gives full boost around 6200 rpm in my setup. so as the rpm is increasing will i be able to use more timing on peak torque or i will have to go the 0-5 degrees range at 6200 rpm.

 

could someone please help me on ignition timing. car is running aem ems,6765 turbo, gsc s2 cams. i need to tune it till 1.3 bar on 93 octane heres my ignition map. it runs ok on 1 bar but sometimes misfires around 6500-7200 rpm after 4-5 runs. if i am using bad timing please let me know.

 

If your getting misfire that's a plug blow out issue not a timing issue in the map do some data logs and see if your getting knock you will want to log knocksum boost afr timing tps and a couple others like fuel trims injectors and see if your getting knock we can't really tell you by just looking at the map...

But timing will not cause the issue with spark plug blowout at least I have never heard of it in my years of fiddling with evo and Subaru ecu's

 

it does it only on 5k to 6k rpm range on 0.5 bar mostly when boost increases by 1 bar it doesnt miss anymore so i thought may be im running too much timing in those areas.

 

To much fuel can also cause a misfire so also look there

 

ill be tuning it this weekend will check spark plug gaps as i didnt do them at all. one more thing if you could answer about peak torque. if im on a bigger frame turbo and it spools fully around 6200 to 6300 rpm while a mid size turbo will spool around 4000 to 4500 rpm range as u can see the difference in rpm of the peak boost will a bigger frame turbo allow to use more timing at 6200 or 6000 rpm or it will have to use conservative timing like medium frame turbos at peak torque/peak boost. what i personally think is this that a smaller turbo spools quickly and engine is at less rpm so it needs conservative timing while when u are already above 5500 rpm engine is running fast enough that u can use more timing on the peak torque/peak boost area.

 

That I'm going to let someone else confidently answer but if it was me I would start with my timing conservative and raise it one degree in that area till I see knock reported then back it down 2 degrees....
I say 2 degrees because I don't like to tune to the edge of knock little things like weather can change the characteristics of a car so I like to walk on the conservative side of the line...
And it's still going to make good power also depends on fuel you running e85 then yes you can run more peak timing

 

ok thanks alot