Ignition tables

[leomarcus]

Your ignition curves look inline with many of the other cars I tune. This was on jonesmechanicals 40R coupe. When I first saw the ignition table that was tuned by active autoworks I was like: WOW CONSERVATIVE and thought we could get a lot more power out of it. So we schedule a dyno time and get it on the dyno. The area in red is red because that is where I made the last changes to the map. I TRIED EVERYTHING. Even said forget it and pulled the timing WAY down and started to slowly advance it till the tq curve started to fall off and I got right back to the same spot again. If I add 1-2 degrees in the red area portion of the map the torque starts to fall. Yet when I look at every map you guys have posted you are all 2-3 degrees more advanced.

BTW this dyno was on 91 pump with alchy meth injection.

Anyway. Here is the map:

Hello, what compression ratio (rc) you are running?

[torsten]

engine: M52B28
CR: 8.3:1
Turbo: GT3582R
exhaust: 3.0"
Gas: 98ROZ = 92oct US



Torsten

[Laimis]

engine: M52B28
CR: 8.3:1
Turbo: GT3582R
exhaust: 3.0"
Gas: 98ROZ = 92oct US



Torsten

Now this is really conservative timing. Unless your trigger setup is alright, you could literally use gunni's timing map instead of yours.

[justik]

torsten, this is modified ignition table or stock for m52b28 ?

PS. Maybe here is similar thread for fuel tables ?

[uk525td]

Justik, it goes above atmospheric, so must be modified
and the timing looks way too conservative to be stock at full (atmospheric) load
pretty sure thats what he has produced so far

[justik]

uk525td, interesting will be compare two ignition tables for stock atmospheric and for turbo.

[uk525td]

well in theory, the timing up to atmospheric should be the same should it not? maybe even a little more advanced due to running lower comp ratios.
Ive seen NA tunes on m50's pushing 30 degrees or more, not saying its right...(on my research for my own setup)

[torsten]

torsten, this is modified ignition table or stock for m52b28 ?

Originally Posted by torsten
engine: M52B28
CR: 8.3:1
Turbo: GT3582R
exhaust: 3.0"
Gas: 98ROZ = 92oct US

...modified...

[justik]

torsten, Did you go to dyno run ? How many hp did you get from that engine ?
PS. As I see from screenshot you use megasquirt ecu, why don't setup factory ecu ?

[alexS62]

Here is the timing table for our stock S62 11/1 CR with E85, locked Vanos. This is a safe tuning in order to limit torque. Dynoed at 500hp - 720 Nm


Uploaded with ImageShack.us

[torsten]

torsten, Did you go to dyno run ? How many hp did you get from that engine ?
PS. As I see from screenshot you use megasquirt ecu, why don't setup factory ecu ?

Yes, I did a dyno run. I pulled 360hp / 530Nm with euro 98ROZ gas and 12psi of boost.
Why I use MS? Because it rocks! You can changed anything at any time. I guess you can't do this with an stock ECU.

[justik]

Yes, I did a dyno run. I pulled 360hp / 530Nm with euro 98ROZ gas and 12psi of boost.

Why you don't increase boost ? 12psi is too few for your cr 8.3:1. I think you can increase boost up to 20psi without any problem ...

[torsten]

Because the euro version of the M52 engine has a alusil block instead of the iron block.
Know I'm on 16psi -> anythings fine so far...

[justik]

Because the euro version of the M52 engine has a alusil block instead of the iron block.

I know, because I have euro spec 328 I thought if you changed pistons for lower CR, you also had done something with block(put iron cylinder sleeves for example).

[wazzu70]

Bump because there is some decent info in here. Still amazed there is not a bigger database.

[NOTORIOUS VR]

Here's my current table..

conservative in boost.. Shell 91 oct (Canada, no Ethanol).
tuned to ~200kpa
2.9L M52 (85.5mm bore, M52 crank, 8.8:1 CR, S52 cams, M52 head).

[JOMARO]

Here's my current table..

conservative in boost.. Shell 91 oct (Canada, no Ethanol).
tuned to ~200kpa

Whats your engine ?

[NOTORIOUS VR]

Whats your engine ?

Updated my post

[5mall5nail5]

Notorious VR those #s are super conservative

[NOTORIOUS VR]

Notorious VR those #s are super conservative

yup, and i mentioned that... i'm still having issues and don't want to push it until I figure it all out. So for now the car is pretty soft.

I have this nagging misfire/popping/lean stumble (not sure what it is), that seems to be quite random and only really apparent under light/med loads (although my dyno video of my exhaust shows random big puffs of black smoke as if there were misfire events). Nothing so far that I've tried has fixed the issue it's quite frustrating.

[Paty]

Hello ignition map which would you recommend to me?
my motor settings:
engine block: m50b25 85,05mm
crankshaft: m52b28
connecting rod: m50b25 NV
pistons: m44b19
head: m50b25 NV
electrical installation: m50b25 Van +knock senzors
CR: 7,5:1
fuel: Ethanol E85
content 2861ccm
MS2 Extra
turbo holset hx40
idle 900rpm
limiter 7000rpm
max boost 22psi
Thank

[mbilaloglu]

7.5 cr and e85 seems wrong.

[Paty]

Which map Would be the best for my setup?

[mbilaloglu]

all those above maps will be conservative for 7.5cr and e85.

[Paty]

thank you